Archived Content

Information identified as archived is provided for reference, research or recordkeeping purposes. It is not subject to the Government of Canada Web Standards and has not been altered or updated since it was archived. Please contact us to request a format other than those available.

Bibliography of the Maurice Lamontagne Institute

Louise SAVARD

SAVARD, L., 2011. Points de référence conformes à l'approche de précaution pour la crevette nordique de l'estuaire et du golfe du Saint-Laurent. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2011/062, 10 p .

Click to see all the text

SAVARD, L., 2011. Reference points consistent with the precautionary approach for northern shrimp in the Estuary and Gulf of St. Lawrence. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2011/062, 9 p .

Click to see all the text

SAVARD, L., H. BOURDAGES, 2011. Mise à jour de l'estimation de biomasse et d'abondance de la crevette nordique (Pandalus borealis) à partir du relevé de chalutage dans l'estuaire et le nord du golfe du Saint-Laurent en 2010 ; Update of the estimation of northern shrimp (Pandalus borealis) biomass and abundance from the trawl survey in the Estuary and the northern Gulf of St. Lawrence in 2010. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2011/043, 34 p .

Click to see all the text

The Estuary and Gulf of St. Lawrence northern shrimp (Pandalus borealis) stock status is determined every year by examining a number of indicators from the commercial fishery and the research survey. This document presents the data and methods that are used to produce the 2010 survey indicators. The estimates of northern shrimp biomass and abundance are presented for each of the four fishing areas and for each sex.

SAVARD, L., 2011. Captures, effort et captures par unité d'effort de la pêche commerciale à la crevette nordique de l'estuaire et du nord du golfe du Saint-Laurent entre 1982 et 2010 ; Catches, effort and catches per unit of effort of the northern shrimp commercial fishery in the Estuary and the northern Gulf of St. Lawrence from 1982 to 2010. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2011/032, 53 p .

Click to see all the text

The Estuary and Gulf of St. Lawrence northern shrimp (Pandalus borealis) stock status is determined every year by examining a number of indicators from the commercial fishery and the research survey. This document presents the data and methods that are used to produce the commercial fishery statistics (catches, effort, catch rates) for the last twenty-nine years (1982-2010) for each of the four fishing areas.

SAVARD, L., 2011. Assessment of shrimp stocks in the Estuary and Gulf of St. Lawrence in 2010. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2011/006, 12 p .

Click to see all the text

SAVARD, L., 2011. Évaluation des stocks de crevette de l'estuaire et du golfe du Saint-Laurent en 2010. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2011/006, 12 p .

Click to see all the text

OUELLET, P., C. FUENTES-YACO, L. SAVARD, T. PLATT, S. SATHYENDRANATH, P. KOELLER, D. ORR, H. SIEGSTAD, 2011. Ocean surface characteristics influence recruitment variability of populations of Northern Shrimp (Pandalus borealis) in the Northwest Atlantic. ICES J. Mar. Sci., 68(4): 737-744 .

Remotely sensed data were used to derive simple ecosystem indicators for four regions of the Northwest Atlantic to test the hypothesis that sea surface temperatures (SSTs) and spring phytoplankton bloom characteristics (initiation, timing, intensity, and duration) have a significant influence on larval survival and recruitment of northern shrimp (Pandalus borealis). For all years (1998–2007) and regions, hatching was after the initiation of the bloom and before or after the bloom reached its maximum intensity. The results suggest that the best survival of larvae is associated with high warming rates of SST following hatching, but in very cold environments, warm temperatures at hatching seem to be important for larval survival. The analyses also indicate that larval survival is supported by an early, long phytoplankton bloom which attains high concentrations of chlorophyll a. The results demonstrate the potential of remotely sensed data for deriving simple population-specific ecosystem indicators for potential use in building operational recruitment models for predicting changes in northern shrimp abundance.

ARCHAMBAULT, D., H. BOURDAGES, B. BERNIER, A. FRÉCHET, J. GAUTHIER, F. GRÉGOIRE, J. LAMBERT, L. SAVARD, 2011. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d’août 2011 dans l’estuaire et le nord du golfe du Saint-Laurent ; Preliminary results from the groundfish and shrimp multidisciplinary survey in August 2011 in the Estuary and northern Gulf of St. Lawrence. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2011/112, 108 p .

Click to see all the text

In 2011, the annual summer survey for the assessment of abundance and distribution of groundfish and shrimp in the Estuary and the northern Gulf of St. Lawrence was conducted from August 1st to 29th onboard the CCGS Teleost. One of the primary objectives was to estimate abundance indices for the main groundfish species (cod, Greenland halibut, Atlantic halibut and redfishes – Sebastes fasciatus and S. mentella -), and for the Northern shrimp, and to identify the spatial distribution and biological characteristics of these species. The two other main objectives of the survey included monitoring the biodiversity of the Estuary and the northern Gulf, and describing oceanographic conditions observed in August for the sampling area. This report describes preliminary results on the catch rates and distribution of 25 taxa, as well as their size frequency distribution. These results were compared with results from the historical survey series that began in 1990, taking into account the equivalency factors used to convert data from the tandem CCGS Alfred Needler-URI to the tandem CCGS Teleost-Campelen. In 2011, the abundance and biomass indices of many species were stable or decreased compared to 2010. In fact, the two redfish species, cod, black dogfish and longfin hake showed index values below their respective means calculated for the comparative period of 1990-2010. Even if Atlantic halibut, witch, thorny skate, hagfish, northern shrimp and snow crab indices decreased from 2010 to 2011, they were comparable or higher than the mean estimated for the 1990-2010 period. Five species (Greenland halibut, white hake, American plaice, capelin and herring) showed an increase for their indices in 2011. Except for white hake, the indices for these species were similar or higher than the 1990-2010 period means. The geographic distributions of catches recorded for the different species in 2011 showed the same pattern as in previous years. Finally, the size distributions ranges determined for each species remains relatively stable for the entire time of the historical series. However, for some species (Greenland halibut, thorny skate, white hake, witch, American plaice, hagfish and northern shrimp), some size classes observed in 2011 were clearly dominant, and their abundance well above the calculated average for the comparative period.

DUFOUR, R., H. BENOIT, M. CASTONGUAY, J. CHASSÉ, L. DEVINE, P. GALBRAITH, M. HARVEY, P. LAROUCHE, S. LESSARD, B. PETRIE, L. SAVARD, C. SAVENKOFF, L. ST-AMAND, M. STARR, 2010. Rapport sur l'état et les tendances des écosystèmes marins canadiens en 2010. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2010/030(révisé), 43 p .

Click to see all the text

NOZERES, C., D. ARCHAMBAULT, P.-M. CHOUINARD, J. GAUTHIER, R. MILLER, E. PARENT, P. SCHWAB, L. SAVARD, J.-D. DUTIL, 2010. Guide d'identification des poissons marins de l'estuaire et du nord du golfe du Saint-Laurent et protocoles suivis pour leur échantillonnage lors des releves par chalut entre 2004 et 2008 ; Identification guide for marine fishes of the estuary and northern Gulf of St. Lawrence and sampling protocols used during trawl surveys between 2004 and 2008. Can. Tech. Rep. Fish. Aquat. Sci., 2866, 168 p .

Click to see all the text

The annual survey that scientists conduct on large research trawlers is an important source of information on the status of marine resources harvested in the estuary and northern Gulf of St. Lawrence. The main objective of the survey is to estimate the abundance and biomass of five commercially important species, i.e., Atlantic cod (Gadus morhua), Greenland halibut (Reinhardtius hippoglossoides), Acadian (Sebastes fasciatus) and deepwater (Sebastes mentella) redfish, and northern shrimp (Pandalus borealis). For several years, biologists have sought to improve the integration of stock status and ecosystem information, which has required a greater effort to better describe catches of other species of fish and invertebrates. The long-used sampling and observation protocol has evolved into a much more complex, detailed model. However, in implementing this protocol, difficulties have been encountered in accurately identifying ten or so species caught at each trawling station. This report provides a guide to the identification of fish species likely to be caught in surveys in the estuary and northern Gulf of St. Lawrence. This visual guide is designed as a practical tool for training staff and ensuring the quality of data collected. This report also describes the sampling and examination protocol for fish catches used for surveys conducted aboard the CGSS Teleost between 2004 and 2008 and presents a brief descriptive analysis of fish catches during this period.

SAVARD, L., 2010. Évaluation des stocks de crevette de l'estuaire et du golfe du Saint-Laurent en 2009. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2010/008, 11 p .

Click to see all the text

SAVARD, L., 2010. Assessment of shrimp stocks in the estuary and Gulf of St. Lawrence in 2009. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2010/008, 11 p .

Click to see all the text

BOURDAGES, H., D. ARCHAMBAULT, D. BERNIER, A. FRECHET, J. GAUTHIER, F. GREGOIRE, J. LAMBERT, L. SAVARD, 2010. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d'août 2009 dans le nord du golfe du Saint-Laurent ; Preliminary results from the groundfish and shrimp multidisciplinary survey in August 2009 in the northern Gulf of St. Lawrence. Rapp. stat. can. sci. halieut. aquat. ; Can. Data Rep. Fish. Aquat. Sci., 1226, 84 p. .

Click to see all the text

In 2009, the annual summer survey for the assessment of abundance and distribution of groundfish and shrimp in the northern Gulf of St. Lawrence was conducted from July 31 to August 31 onboard the CCGS Teleost. One of the primary objectives was to estimate abundance indices for the mam groundfish species (particularly cod, Greenland halibut and redfish), and for the Northern shrimp, and to identify the spatial distribution and biological characteristics of these species. Other objectives included monitoring the biodiversity of the nOlthern Gulf and describing oceanographic conditions obser.ved in August. This report describes preliminary results on the catch rate and distribution of 15 taxa, as well as their size frequency distribution. These results were compared with results from the historical survey series that began in 1990, taking into account the equivalency factors used to convert the data from the tandem CCGS Alfred Needler-URI with the tandem CCGS Teleost-Campelen. In 2009, the abundance and biomass indices of many species have decreased compared to the previous years. In fact, the redfish, black dogfish and longfin hake indices are among the lowest values of the series. Greenland halibut, for which indices decreased by about 30 %, shows values similar to the early 2000's. However, the indices observed in 2009 for the other species (cod, Northern shrimp, Atlantic halibut, thorny skate, white hake, American plaice, witch flounder and snow crab) are comparable to the means of the last five years even though a decrease was observed compared to last year. The geographic distributions of catches recorded for the different species in 2009 show the same pattern as we have seen over the previous seven years

DUFOUR, R., H. BENOIT, M. CASTONGUAY, J. CHASSÉ, L. DEVINE, P. GALBRAITH, M. HARVEY, P. LAROUCHE, S. LESSARD, B. PETRIE, L. SAVARD, C. SAVENKOFF, L. ST-AMAND, M. STARR, 2010. Ecosystem status and trends report: Estuary and Gulf of St. Lawrence ecozone. Rapport sur l’état et les tendances des écosystèmes : écozone de l’estuaire et du golfe du Saint Laurent. DFO, Canadian Science Advisory Secretariat, Research Document ; MPO, Secrétariat canadien de consultation scientifique, Document de recherche; 2010/030, 193 p .

Click to see all the text

This document was produced under the umbrella of the national ecosystem status and trends report program and deal with the estuary and gulf of St.Lawrence ecozone. It is structured around the status and trends of some important marine species and physico-chemical variables of the ecosystem. The national ecosystem status and trends report will support prioruty-setting for a national biodiversity agenda and will integrate national and provincial exosystem-bases information. It will report on many large terrestrial and marine ecozones.

SAVARD, L., H. BOURDAGES, 2010. Estimation de la biomasse et de l’abondance de la crevette nordique Pandalus borealis à partir du relevé de chalutage annuel dans l’estuaire et le nord du golfe du Saint-Laurent entre 1990 et 2009 ; Estimation of northern shrimp Pandalus borealis biomass and abundance from the annual trawl survey in the Estuary and the northern Gulf of St. Lawrence from 1990 to 2009. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2010/061, 51 p .

Click to see all the text

The Estuary and Gulf of St. Lawrence northern shrimp Pandalus borealis) stock status is determined every year by examining a number of indicators from the commercial fishery and the research survey. This document presents the data and methods that are used to produce the survey indicators. The estimates of northern shrimp biomass and abundance for the twenty years of the survey (1990-2009) are presented for each of the four fishing areas and for each sex.

SAVARD, L., 2009. Assessment of shrimp stocks in the Estuary and Gulf of St. Lawrence in 2008. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2009/001, 12 p .

Click to see all the text

SAVARD, L., 2009. Évaluation des stocks de crevette de l'estuaire et du golfe du Saint-Laurent en 2008. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2009/001, 12 p .

Click to see all the text

SAVARD, L., 2008. Évaluation des stocks de crevette de l’estuaire et du golfe du Saint-Laurent en 2007. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2008/002, 12 p .

Click to see all the text

BOURDAGES, H., D. ARCHAMBAULT, B. BERNIER, A. FRÉCHET, J. GAUTHIER, F. GRÉGOIRE, J. LAMBERT, L. SAVARD, 2008. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d’août 2007 dans le nord du golfe du Saint-Laurent ; Preliminary results from the groundfish and shrimp multidisciplinary survey from August 2007 in the northern Gulf of St. Lawrence. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2008/046, 77 p .

Click to see all the text

In 2007, the annual summer survey for the assessment of abundance and distribution of groundfish and shrimp in the Quebec region was conducted from August 3rd to September 1st in the estuary and northern Gulf of St. Lawrence on board the CCGS Teleost. One of its primary objectives was to estimate abundance indices for the main groundfish species, including the three species targeted by the survey (cod, Greenland halibut, redfish) and Northern shrimp (also targeted by the survey), identify spatial distribution and their biological characteristics. Among the other objectives, the survey aimed at providing a concurrent portrait of environmental conditions in the Gulf for 7 of the Gulf’s 8 geographic regions considered in the assessment of the Gulf’s physical conditions. This report describes for 14 species the preliminary results for catch rate and distribution, as well as their size frequency distribution. These results were compared with the results from the historical survey series introduced in 1990, taking into account the equivalency factors used to convert the data from the tandem CCGS Alfred Needler-URI with the tandem CCGS Teleost-Campelen. None of the species showed much variation compared with the two previous years, except for Atlantic halibut with a still increasing abundance index in 2007. The geographic distribution of catches recorded for the different species in 2007 can be compared to the five previous years. In 2007, the temperatures recorded for surface waters and for the cold intermediate layer (CIL) were generally colder for the entire covered area compared with the temperatures recorded in 2006. The layers <1°C and <0°C of the CIL were much thicker in 2007 than in 2006. However, the temperatures recorded for deep water (300+m) were similar during these two years. Concentrations of dissolved oxygen in the Estuary waters were still considered hypoxic in 2007.

SAVARD, L., 2008. Assessment of shrimp stocks in the Estuary and Gulf of St. Lawrence in 2007. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2008/002, 12 p .

Click to see all the text

BOURDAGES, H., D. ARCHAMBAULT, B. BERNIER, A. FRÉCHET, J. GAUTHIER, F. GRÉGOIRE, J. LAMBERT, L. SAVARD, 2008. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d'août 2008 dans le nord du golfe du Saint-Laurent ; Preliminary results from the groundfish and shrimp multidisciplinary survey from August 2007 in the northern Gulf of St. Lawrence. Rapp. stat. can. sci. halieut. aquat. ; Can. Data Rep. Fish. Aquat. Sci., 1210, 84 p. .

Click to see all the text

In 2008, the annual summer survey for the assessment of abundance and distribution of groundfish and shrimp in the northern Gulf of St. Lawrence was conducted from July 24th to August 25th onboard the CCGS Teleost. One of the primary objectives was to estimate abundance indices for the principal groundfish species, including the three fish species targeted by the survey (cod, Greenland halibut and redfish), and for the Northern shrimp, identify for each of them their spatial distribution and biological characteristics. One of the other objectives, the survey aimed at providing a concurrent portrait of environmental conditions observed in August in the Gulf. This report describes for 14 species the preliminary results for their catch rate and distribution, as well as their size frequency distribution. These results were compared with results from the historical survey series that began in 1990, taking into account the equivalency factors used to convert the data from the tandem CCGS Alfred Needler-URI with the tandem CCGS Teleost-Campelen. While the biomass index in 2008 is still increasing for Atlantic halibut, the indices obtained for the other species are comparable to the means of the last three years. The geographic distributions of catches recorded for the different species in 2008 show the same pattern as for the five previous years.

OUELLET, P., L. SAVARD, P. LAROUCHE, 2007. Spring oceanographic conditions and northern shrimp Pandalus borealis recruitment success in the north-western Gulf of St. Lawrence. Mar. Ecol. Prog. Ser., 339 : 229-241 .

Time series of sea-surface temperature (SST), thermally mixed layer depth, and the SST warming rate in spring at the time of larval emergence were correlated with indices of northern shrimp Pandalus borealis recruitment (cohort abundance and larval survival index) between 1994 and 2003 in the northwest Gulf of St. Lawrence, Canada. The recruitment index and larval survival index were negatively correlated to daily mean SST at the time of larval emergence. The recruitment index and larval survival index were positively correlated with the SST warming rate and with the mixed layer depth at the time of larval emergence. Overall, the analysis reveals that larval emergence during a period of weak density stratification and low SST in the spring, but followed by relatively high warming rates of the upper layer of the water column, is favourable for larval survival. We suggest that the observed relationships support the hypothesis that oceanographic conditions in the upper layer of the water column, which initiate and sustain high levels of biological production at the time of larval emergence and early development, are favourable for northern shrimp recruitment success. Thus, interannual variability in northern shrimp recruitment in the northwest Gulf of St. Lawrence may be explained by Cushing’s match/mismatch hypothesis. ©2007 Inter-Research

OUELLET, P., L. SAVARD, P. LAROUCHE, 2007. Spring oceanographic conditions and northern shrimp Pandalus borealis recruitment success in the northwestern Gulf of St. Lawrence. AZMP Bull. PMZA, 6: 47-52 .

Click to see all the text

[Abstract only available in French]
Des séries temporelles de la température de surface (TS), de la profondeur de la couche mélangée (en température) et du taux de réchauffement de TS au printemps au moment de l’émergence des larves de crevettes ont été corrélées à des indices de recrutement de la crevette nordique (Pandalus borealis) entre 1994 et 2004 dans le nord-ouest du golfe du Saint-Laurent, Canada. L’indice de la survie larvaire était corrélé négativement avec la moyenne journalière de TS au moment de l’émergence des larves de crevettes. L’indice de la survie larvaire était corrélé positivement avec le taux de réchauffement de TS et la profondeur de la couche mélangée au moment de l’émergence des larves. Dans leur ensemble, les analyses ont révélé que l’émergence des larves de crevettes pendant une période de faibles stratifications de densité et de faibles TS au printemps, suivi d’un taux de réchauffement relativement élevé dans la couche supérieure de la colonne d’eau est favorable à la survie des larves. Notre étude montre aussi l’importance d’un monitorage des conditions océanographiques tôt au printemps dans l’écosystème du nord du golfe du Saint-Laurent.

SAVARD, L., 2007. Assessment of shrimp status in the Estuary and Gulf of St. Lawrence in 2006. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2007/006, 12 p .

Click to see all the text

CHABOT, D., A. RONDEAU, B. SAINTE-MARIE, L. SAVARD, T. SURETTE, P. ARCHAMBAULT, 2007. Distribution des invertébrés benthiques dans l'estuaire et le golfe du Saint-Laurent ; Distribution of benthic invertebrates in the Estuary and Gulf of St. Lawrence. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2007/018, 108 p .

Click to see all the text

This study had two objectives. The first was to gather all the available data from scientific surveys both at the Maurice-Lamontagne Institute (MLI) and the Gulf Fisheries Centre (GFC) in order to establish distribution patterns and relative abundance of benthic invertebrates in the lower estuary and the gulf of St. Lawrence (LEGSL). The second objective was to propose Ecologically and Biologically Significant Areas (EBSAs) for benthic invertebrates of the LEGSL, according to these distribution and relative abundance data. Surveys from the MLI are mainly conducted in the lower estuary and in the northern gulf of St. Lawrence (nGSL) but some cover Gaspesie, including Chaleurs bay, and the Magdalen Islands. The southern gulf of St. Lawrence (sGSL) is covered by the GFC surveys. The bulk of the information presented here comes from annual scientific surveys carried out by the two regions: the multi-species survey and the mobile gear Sentinel survey by the MLI and the fall survey, snow crab survey, and Northumberland survey by the GFC. Several other surveys by MLI provided useful data, some even with a long time series but with limited geographical coverage (surveys for snow crab, scallop and surf clam), while others were conducted less frequently and at a small geographic scale (surveys for clam and whelk). Cod and Greenland halibut stomach contents have also been used as a sampling device for the distribution on some benthic invertebrates. Despite the large number of surveys considered here, the coastal zone (less than 50 m deep in the Estuary and the nGSL and less than 30 m deep in the sGSL) was not adequately sampled, except for the Northumberland Strait. In the main section of this document, distributions of 44 taxa are presented and have guided the identification of EBSAs : 4 general groups (soft corals, anemones, sponges, ascidians), 5 echinoderms, 6 molluscs, 1 mysid, 22 shrimps, and 6 crabs. Zones of maximum relative abundance of each taxa, weighted inversely to their surface area of high abundance, were used to calculate an index of benthic invertebrate concentration for each 10 x 10 km square sampled in the study area. This index was the primary tool in the identification of potential EBSAs. As a result, 17 EBSAs for benthic invertebrates are proposed. However, it is important to keep in mind that only a small proportion (approximately 0.02 %) of the benthic invertebrate species known to be present in the study area was considered in the process. In particular, the lack of data for the coastal zone is a major gap. We present in appendix to this report the data on 6 coastal species that we were able to obtain.

BOURDAGES, H., L. SAVARD, D. ARCHAMBAULT, S. VALOIS, 2007. Résultats des expériences de pêche comparative d'août 2004 et 2005 dans le nord du golfe du Saint-Laurent, entre le NGCC Alfred Needler et le NGCC Teleost ; Results from the August 2004 and 2005 comparative fishing experiments in the northern Gulf of St. Lawrence between the CCGS Alfred Needler and the CCGS Teleost. Rapp. tech. can. sci. halieut. aquat. ; Can. Tech. Rep. Fish. Aquat. Sci., 2750, 57 p .

Click to see all the text

[Abstract only available in French]
Un relevé de chalutage de fond pour le poisson de fond et la crevette est réalisé annuellement en été dans l’estuaire et le nord du golfe du Saint-Laurent. De 1990 à 2003, le relevé a été réalisé à partir du navire NGCC Alfred Needler équipé d’un chalut à crevette URI 81’/114’. Depuis 2004, le navire NGCC Teleost équipé d’un chalut à crevette Campelen a remplacé le NGCC Alfred Needler et est maintenant utilisé pour réaliser le relevé. Les navires et les chaluts étant passablement différents, il a été convenu que des expériences de pêche comparative seraient réalisées en 2004 et 2005 afin d’être en mesure d’estimer la différence de capturabilité entre les deux tandems navire/chalut. Le but de cette étude est d’estimer la correction qui doit être appliquée aux captures du NGCC Alfred Needler pour les rendre équivalentes à celles qui auraient été faites dans les mêmes conditions sur le NGCC Teleost. Dans tous les cas où le tandem navire/chalut a eu un effet significatif sur la capturabilité des espèces, les captures du NGCC Teleost étaient supérieures à celles du NGCC Needler. La capturabilité relative est positive et supérieure à 1 dans tous les cas, que les captures soient exprimées en nombre ou en poids. Les analyses statistiques ont démontré que les captures des espèces de poissons et d’invertébrés examinées sont influencées différemment par le changement de navire et de chalut. La correction à apporter aux captures est spécifique à chaque espèce et est basée sur le modèle statistique qui décrit le mieux l’effet des covariables sur la capturabilité.

SAVARD, L., 2007. Évaluation de l'état de la crevette de l'estuaire et du golfe du Saint-Laurent en 2006. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2007/006, 12 p .

Click to see all the text

SAVARD, L., 2006. Assessment of shrimp stocks in the Estuary and Gulf of St. Lawrence in 2005. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2006/003, 12 p .

Click to see all the text

SAVENKOFF, C., L. SAVARD, B. MORIN, D. CHABOT, 2006. Main prey and predators of northern shrimp (Pandalus borealis) in the northern Gulf of St. Lawrence during the mid-1980s, mid-1990s, and early 2000s. Can. Tech. Rep. Fish. Aquat. Sci., 2639, 28 p .

Click to see all the text

We used results of mass-balance models to describe the changes in the structure and functioning of the northern Gulf of St. Lawrence ecosystem related to northern shrimp (Pandalus borealis) for the mid-1980s, the mid-1990s, and the early 2000s. The net decrease in biomass of the large-bodied demersal species and the ensuing drop in predation in the mid-1990s may explain the increase in abundance of the northern shrimp at the end of the 1990s. Shrimp was among the main prey species, and predation was the main cause of shrimp mortality for all time periods. Greenland halibut (Reinhardtius hippoglossoides) progressively replaced cod (Gadus morhua) and redfish (Sebastes spp.) as the main shrimp predators. Since the biomass of Greenland halibut sharply increased since 1995, its effect via predation as well as fishing pressure should be considered in the elaboration of management strategies for shrimp in the northern Gulf of St. Lawrence.

SAVARD, L., 2006. Évaluation des stocks de crevette de l'estuaire et du golfe du Saint-Laurent en 2005. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2006/003, 12 p .

Click to see all the text

SAVARD, L., 2005. La crevette de l'estuaire et du golfe du Saint-Laurent en 2004. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2005/035, 9 p .

Click to see all the text

SAVARD, L., 2005. Shrimp of the Estuary and Gulf of St. Lawrence in 2004. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2005/035, 9 p .

Click to see all the text

SAVARD, L., H. BOUCHARD, 2004. État des stocks de crevette (Pandalus borealis) de l'estuaire et du golfe du Saint-Laurent en 2003 ; Estuary and Gulf of St. Lawrence shrimp (Pandalus borealis) stock status in 2003. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2004/091, 62 p .

Click to see all the text

In 2003, all the indicators of abundance and of biomass of shrimp available to the fishery as well as the indicator of success of the fishery were positive. However, the indicators of size of females available for reproduction and to the fishery remained negative. The catch per unit of effort of the commercial fishery was higher than the 1990-1999 mean but the mean size of spawning females was still low. The research survey indices were very high, well above the 1990-1999 mean. The exploitation rate index decreased noticeably in all areas, reaching values lower than the 1990-1999 mean. In 2004, the fishery will be sustained by the females of the abundant 1997 year class and, to a lesser extent, by those of the 1998 year class. Moreover, the 1999 year class (very abundant in 2003) should recruit to the female component in 2004. The mean size of spawning females is not likely to increase significantly in 2004. Projections made for 2004 indicate that the abundance and biomass available to the fishery as well as the fishing success should be higher than what they have been since 2001. This positive change in the stock status justifies an adjustment of the TACs in order to take advantage of the high abundance of the 1997 and 1999 year classes, which will sustain the fishery in 2004 and 2005.

SAVARD, L., 2004. Shrimp of the Estuary and Gulf of St. Lawrence in 2003. Science, Stock Status Report, 2004/009, 13 p .

Click to see all the text

SAVARD, L., 2004. La crevette de l’estuaire et du golfe du Saint-Laurent en 2003. Rapport sur l'état des stocks, 2004/009, 13 p .

Click to see all the text

BOURDAGES, H., D. ARCHAMBAULT, B. MORIN, A. FRÉCHET, L. SAVARD, F. GRÉGOIRE, R. DUFOUR, 2004. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d'août 2004 dans le nord du golfe du Saint-Laurent ; Preliminary results from the groundfish and shrimp multidisciplinary survey from August 2004 in the northern Gulf of St. Lawrence. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2004/112, 40 p .

Click to see all the text

As a result of the delays in putting the CCGS Alfred Needler into operation, the August 2004 multidisciplinary groundfish and shrimp survey in the northern Gulf of St. Lawrence was conducted aboard the CCGS Teleost, which itself suffered major damage, delaying the start of the mission. The survey was conducted between August 15 and September 2, corresponding to a period that was just over half of the time initially planned. A total of 130 tows were made throughout the area, 95 % of which were successful. Summary findings for catch rates, catch rate distributions and size frequency distributions are presented for 14 species, including the 4 species targeted by the survey (cod, Greenland halibut, redfish and Northern shrimp). However, the 2004 findings are preliminary and must be considered as such until laboratory analyses and data validation have been completed. With the exception of data on the spatial distribution of catches, data obtained during this survey cannot be compared with data obtained during previous missions aboard the CCGS Alfred Needler until conversion indices for each species will be calculated using data obtained during comparative missions. Data gathered in 2004 on the catch distribution of the various species indicate a pattern similar to those observed in previous years aboard the CCGS Alfred Needler.

OUELLET, P., F. GRÉGOIRE, M. HARVEY, E. HEAD, B. MORIN, G. ROBERT, L. SAVARD, S. SMITH, M. STARR, D. SWAIN, 2003. Exceptional environmental conditions in 1999 in eastern Canadian waters and the possible consequences for some fish and invertebrate stocks. AZMP Bull. PMZA, 3: 21-27 .

Click to see all the text

[Abstract only available in French]
Plusieurs indicateurs des conditions atmosphériques indiquent que des températures de l’air anormalement élevées en 1999 ont entraîné une réduction de la glace de mer en hiver et au printemps sur les plateaux continentaux de Terre-Neuve, du Labrador et de la Nouvelle-Écosse et une augmentation des températures de l’eau de surface sur l’ensemble de la zone Atlantique. Également, d’autres indices indiquent que le cycle de production biologique (la floraison du phytoplancton) a été initié plus tôt en 1999 dans la plupart des régions de la zone. Ces conditions océanographiques exceptionnelles auraient eu des conséquences positives sur la production (ex. recrutement, croissance) de nombreux stocks de poissons et d’invertébrés dans l’Est du Canada.

SAVARD, L, 2003. Shrimp of the estuary and Gulf of St. Lawrence in 2002. Science, Stock Status Report, 2003/014, 12 p .

Click to see all the text

SAVARD, L., 2003. La crevette de l'estuaire et du golfe du Saint-Laurent en 2002. Rapport sur l'état des stocks, 2003/014, 13 p .

Click to see all the text

CAMIRAND, R., B. MORIN, L. SAVARD, 2003. Historical and current knowledge of the Greenland Halibut from the Quebec fixed-gear fishers in the Gulf of St. Lawrence. Pages 366-374 in N. Haggan, C. Brignam and L. Wood (ed.). Putting Fishers Knowledge to Work. Conference Proceedings August 27-30 2001. Fish. Cent. Res. Rep., 11(1) .

SAVARD, L., H. BOUCHARD, P.COUILLARD, 2003. Revue de la pêche à la crevette nordique (Pandalus borealis) dans l'estuaire et le golfe du Saint-Laurent pour la période 1965-2000. Rapp. tech. can. sci. halieut. aquat., 2465, 143 p .

Click to see all the text

The northern shrimp (Pandalus borealis) fishery began in the Gulf of St. Lawrence in 1965. Catches increased progressively to reach about 26,000 tons in 2000, with a landed value of $40 million. The shrimp fishery is carried out by trawlers; all skippers must fill out a logbook and indicate the fishing location, the number of hours trawled, and an estimate of the catch volume. These fishery data constitute an invaluable source of information about the development of the fishery, the exploration of the fishing grounds, and the success of commercial operations. This report aims firstly at reviewing the various management measures put in place during the 1980s and 1990s and secondly at describing the development of commercial activities. An examination of the spatial, seasonal and annual patterns of catches, fishing effort, and catch rates clearly shows the development of commercial operations in relation to the acquisition of knowledge by fishing crews and to fluctuations in resource abundance.

BOURDAGES, H., D. ARCHAMBAULT, B. MORIN, A. FRÉCHET, L. SAVARD, F. GRÉGOIRE, M. BÉRUBÉ, 2002. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d'août 2002 dans le nord du golfe du Saint-Laurent ;. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2002/090, 69 p .

Click to see all the text

In 2002, the groundfish and shrimp multidisciplinary survey in the northern Gulf took place between August 1st and September 1st. A total of 207 fishing tows were conducted over the entire area of which 190 were successful, which corresponds to 76 % of the initial objective of 250 tows. Summary results concerning biomass and abundance, length frequencies and distribution of catch rates are presented for 13 species, including the four that are targeted by the survey (cod, Greenland halibut, redfish and shrimp). Results from 2002 are compared with those from previous years in order to have an indication of the trends for the 13 years time series. However results from 2002 are preliminary and must be considered as such pending laboratory analysis and completion of the validation of data. According to these preliminary results, biomass indices for cod, redfish, witch flounder and American plaice are very low in the northern Gulf while those of shrimp and Greenland halibut have remained high. A general decline in catches is observed for the majority of species along the West Coast of Newfoundland. However, the coverage of this area in 2002 was restricted due to frequent gear damage.

SAVARD, L., H. BOUCHARD, H. BOURDAGES, 2002. Évaluation des stocks de crevette (Pandalus Borealis) de l'estuaire et du golfe du Saint-Laurent pour la période 1990-2001 ; Estuary and Gulf of St. Lawrence shrimp (Pandalus Borealis) stock assessment for the 1990-2001 period. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2002/068, 90 p .

Click to see all the text

Overall, the research survey indices show that the shrimp biomass was very high in 2000 and diminished in 2001, moving closer to the mean observed during the 1990-1999 period. Abundance of females decreased in 2001 but is comparable to observations in 1998 and 1999. Not all individuals of the 1997 year-class appear to have changed sex in spring 2001: a certain proportion has remained male. Commercial catch rates were slightly down in the Sept-Îles and Anticosti areas in 2001, but still above the mean for 1990-1999. Exploitation rate indices rose, but are comparable to the mean for 1990-1999. The 2002 fishery will mainly involve the 1997 and 1998 year-classes. The 1997 year-class, which seemed very abundant in commercial and survey catches in 1999 and 2000, produced no substantial increase in commercial catch rates and biomass estimates in 2001. Many individuals remained male in 2001 and should be available to the fishery as females in 2002. However, those that changed sex in 2001 have produced smaller females. The 1998 year-class was weakly represented in the survey and commercial fishery catches, and so no substantial increase in the fishery and survey indices is expected in 2002. Males from the 1999 year-class were a strong presence in fishery and survey catches in 2001. However, they will not change sex and should not contribute to any significant increase in the size of the shrimp taken in 2002.

SAVARD, L., 2002. Shrimp of the Estuary and Gulf of St. Lawrence. Science, Stock Status Report, C4-06, 10 p .

Click to see all the text

SAVARD, L., 2002. La crevette de l'estuaire et du golfe du Saint-Laurent. Rapport sur l'état des stocks, C4-06, 11 p .

Click to see all the text

SAVARD, L., 2001. Shrimp of the Estuary and Gulf of St. Lawrence. Science, Stock Status Report, C4-06, 11 p .

Click to see all the text

SAVARD, L., 2001. La crevette de l'estuaire et du golfe du Saint-Laurent. Rapport sur l'état des stocks, C4-06, 11 p .

Click to see all the text

SAVARD, L., 2000. La crevette de l'estuaire et du golfe du Saint-Laurent. Rapport sur l'état des stocks, C4-06, 16 p .

Click to see all the text

SAVARD, L., 2000. Shrimp of the Estuary and Gulf of St. Lawrence. Science, Stock Status Report, C4-06, 16 p .

Click to see all the text

SÉVIGNY, J.-M., L. SAVARD, D.G. PARSONS, 2000. Genetic characterization of the northern shrimp, Pandalus borealis, in the Northwest Atlantic using electrophoresis of enzymes. J. Northwest Atl. Fish. Sci., 27: 161-175 .

Click to see all the text

SEVIGNY, J.-M., L. SAVARD, D.G. PARSONS, 1999. Genetic characterization of the northern shrimp Pandalus borealis, in the Northwest Atlantic. NAFO SCR Doc., 99/89, 16 p .

SAVARD, L., D.G. PARSONS, 1999. A precautionary approach to assessment and management of pandalid shrimp with application to Pandalus borealis in NAFO division 3M. NAFO SCR Doc., 99/15, 11 p .

SAVARD, L., 1999. La crevette de l'estuaire et du golfe du Saint-Laurent. Rapport sur l'état des stocks, C4-06, 12 p .

Click to see all the text

SAVARD, L., 1999. Shrimp of the estuary and Gulf of St. Lawrence. Science, Stock Status Report, C4-06, 12 p .

Click to see all the text

DUTIL, J.-D., M. CASTONGUAY, M.O. HAMMILL, P. OUELLET, Y. LAMBERT, D. CHABOT, H. BROWMAN, D. GILBERT, A. FRÉCHET, J.-A. GAGNÉ, D. GASCON, L. SAVARD, 1998. Environmental influences on the productivity of cod stocks : some evidence for the northern Gulf of St. Lawrence, and required changes in management practices. DFO, Canadian Stock Assessment Secretariat, Research Document, 98/18, 42 p .

LAMBERT, J., H. BOUCHARD, L. SAVARD, 1998. État des populations de crevettes nordiques (Pandalus borealis) de l'estuaire et du golfe du Saint-Laurent (divisions 4RST de l'OPANO). MPO, Secrétariat canadien pour l'évaluation des stocks, Document de recherche, 98/102, 34 p .

Data from research surveys and commercial fishery for northern shrimp in the Gulf of St. Lawrence were analyzed and results are presented to show overall tendencies in the abundance of shrimp and the impact of harvest on the stocks. The abundance index for shrimp in the Gulf and Estuary has fluctuated since the 1980s. However, assessment results indicate that the populations were in good condition at the end of the 1997 fishing season. Fluctuations in abundance can be explained by the strength of the year-classes supporting the fishery. Thus, the high abundance indices of 1994, 1995, 1996 and 1997 are due to the contribution of the strong year-classes produced in the early 1990s. Shrimp in the size-class 19 to 21 mm that were hatched mainly in 1994, should reach sizes that are fully retained by trawls in 1998. This year-class, along with the strong 1993 year-class, should maintain catches at high levels in 1998.

SAVARD, L., J.-A. GAGNÉ, 1997. L'état des ressources marines de l'estuaire et du golfe du Saint-Laurent. Pages 141-153 in L. Lauzon, H. Dion & C.E. Delisle (éd.). Le Saint-Laurent pour la vie : actes du 21e congrès de l'Association des biologistes du Québec (Collection Environnement de l'Université de Montréal, 23) .

SAVARD, L., 1997. Shrimp of the estuary and the Gulf of St. Lawrence. Science, Stock Status Report, C4-06, 15 p .

Click to see all the text

SAVARD, L., 1997. La crevette de l'estuaire et du golfe du Saint-Laurent. Rapport sur l'état des stocks, C4-06, 15 p .

Click to see all the text

SAVARD, L., 1996. Shrimp of the estuary and the Gulf of St-Lawrence. DFO, Atlantic Fisheries, Stock Status Report, 96/9, 16 p .

SAVARD, L., 1996. La crevette de l'estuaire et du golfe du Saint-Laurent. MPO, Pêches de l'Atlantique, Rapport sur l'état des stocks, 96/9, 16 p .

SAVARD, L., 1996. Réflexions pour une approche prudente du développement de nouvelles pêches. Pages 119-122 in Atelier sur le développement durable de l'oursin vert - 27 et 28 mars 1996, Grande-Rivière. Ministère de l'agriculture, des pêcheries et de l'alimentation .

SAVARD, L., H. BOUCHARD, 1995. Northern shrimp in the estuary and Gulf of St. Lawrence. Pages 100-122 in L. Savard (ed.). Status report on invertebrates in 1994 : crustaceans and molluscs on the Québec coast, northern shrimp and zooplankton in the estuary and Gulf of St. Lawrence. DFO (Can. Manuscr. Rep. Fish. Aquat. Sci., 2323) .

SAVARD, L. (ed.), 1995. Status report on invertebrates in 1994 : crustaceans and molluscs on the Québec coast, northern shrimp and zooplankton in the estuary and Gulf of St. Lawrence. Can. Manuscr. Rep. Fish. Aquat. Sci., 2323, 132 p .

Click to see all the text

This report contains the assessment results of marine invertebrate populations that sustain an inshore fishery in Quebec : snow crab in the Estuary and the Northern Gulf (fishing areas 13 to 17); lobster of Gaspésie, Îles-de-la-Madeleine and on the North Shore (fishing areas 15 to 22); giant and Iceland scallop of Gaspésie, Îles-de-la-Madeleine and on the North Shore (fishing areas 15 to 20); bivalve molluscs, Stimpson surf clam and razor clam, of the Quebec coastal waters. The results of the assessment on northern shrimp (fishing areas 8 to 12) and zooplankton (euphausids and Calanus) of the Estuary and the Gulf of Saint Lawrence are also presented. This report summarizes the status of the resources as determined at the end of the 1994 fishing season, the future perspectives regarding population abundance and recruitment as well as the impact of exploitation and some fishing practices. Some particularities of the species biology and ecology are also described to help to understand the conservation and management approaches advocated to protect the resources.

SAVARD, L., H. BOUCHARD, 1995. Crevette nordique de l'estuaire et du golfe du Saint-Laurent (zones de pêche 8, 9, 10 et 12). Pages 104-127 in L. Savard (éd.). Rapport sur l'état des invertébrés en 1994 : crustacés et mollusques des côtes du Québec, crevette nordique et zooplancton de l'estuaire et du golfe du Saint-Laurent. MPO (Rapp. manus. can. sci. halieut. aquat., 2323) .

SAVARD, L. (éd.), 1995. Rapport sur l'état des invertébrés en 1994 : crustacés et mollusques des côtes du Québec, crevette nordique et zooplancton de l'estuaire et du golfe du Saint-Laurent. Rapp. manus. can. sci. halieut. aquat., 2323, 137 p .

Click to see all the text

This report contains the assessment results of marine invertebrate populations that sustain an inshore fishery in Québec : snow crab in the Estuary and the Northern Gulf (fishing areas 13 to 17); lobster of Gaspésie, Îles-de-la-Madeleine and on the North Shore (fishing areas 15 to 22); giant and Iceland scallop of Gaspésie, Îles-de-la-Madeleine and on the North Shore (fishing areas 15 to 20); bivalve molluscs, Stimpson surf clam and razor clam, of the Québec coastal waters. The results of the assessment on northern shrimp (fishing areas 8 to 12) and zooplankton (euphausids and Calanus) of the Estuary and the Gulf of Saint Lawrence are also presented. This report summarizes the status of the resources as determined at the end of the 1994 fishing season, the future perspectives regarding population abundance and recruitment as well as the impact of exploitation and some fishing practices. Some particularities of the species biology and ecology are also described to help to understand the conservation and management approaches advocated to protect the resources.

SAVARD, L., Y. SIMARD, 1994. Crevette nordique de l'estuaire et du golfe du Saint-Laurent (zones de pêche 8, 9, 10 et 12). Pages 103-128 in L. Savard (éd.). Rapport sur l'état des invertébrés en 1993 : crustacés et mollusques des côtes du Québec et crevette nordique de l'estuaire et du golfe du Saint-Laurent. MPO (Rapp. manus. can. sci. halieut. aquat., 2257) .

SAVARD, L., D.G. PARSONS, D.M. CARLSSON, 1994. Estimation of age and growth of northern shrimp (Pandalus borealis) in Davis Strait (NAFO Subareas 0+1) using cluster and modal analyses. J. Northwest Atl. Fish. Sci., 16: 63-74 .

Click to see all the text

SAVARD, L. (éd.), 1994. Rapport sur l'état des invertébrés en 1993 : crustacés et mollusques des côtes du Québec et crevette nordique de l'estuaire et du golfe du Saint-Laurent. Rapp. manus. can. sci. halieut. aquat., 2257, 128 p .

Click to see all the text

This report presents the assessment results of marine invertebrate populations that sustain an inshore fishery in Quebec (snow crab, lobster, scallop, whelk, Stimpson surf clam, razor and soft shell clam). The assessment of northern shrimp aggregations exploited in the Estuary and the Gulf of St. Lawrence is also presented. The report summarizes the status of the resources as determined at the end of the 1993 fishing seasons, the future perspectives regarding population recruitment and abundance as well as the impact of exploitation and of some fishing practices. Some particularities of the species biology and ecology are also described to help to understand the resource conservation and management approaches.

SAVARD, L. (ed.), 1994. Status report on invertebrates 1993 : crustaceans and mollusc on the Québec coast and northern shrimp in the Estuary and Gulf of St. Lawrence. Can. Manuscr. Rep. Fish. Aquat. Sci., 2257, 113 p .

Click to see all the text

This report presents the assessment results of marine invertebrate populations that sustain an inshore fishery in Quebec (snow crab, lobster, scallop, whelk, Stimpson surf clam, razor and soft shell clam). The assessment of northern shrimp aggregations exploited in the Estuary and the Gulf of St. Lawrence is also presented. The report summarizes the status of the resources as determined at the end of the 1993 fishing seasons, the future perspectives regarding population recruitment and abundance as well as the impact of exploitation and of some fishing practices. Some particularities of the species biology and ecology are also described to help to understand the resource conservation and management approaches.

GENDRON, L., L. SAVARD, D. BOISVERT, J.-M. NADEAU, 1994. Overview of the development of underutilized species fisheries in the Québec Region. Pages 13-17 in L. Gendron & S. Robinson (ed.). The development of underutilized invertebrate fisheries in eastern Canada. DFO (Can. Manus. Rep. Fish. Aquat. Sci., 2247) .

SAVARD, L., Y. SIMARD, 1994. Northern shrimp in the estuary and the Gulf of St. Lawrence (fishing areas 8, 9, 10 and 12). Pages 91-113 in L. Savard (ed.). Status report in invertebrates 1993 : crustaceans and molluscs on the Québec coast and northern shrimp in the Estuary and Gulf of St. Lawrence. DFO (Can. Manuscr. Rep. Fish. Aquat. Sci., 2257) .

SAVARD, L., S. HURTUBISE, H. BOUCHARD, 1993. Évaluation des agrégations de crevettes nordiques (Pandalus borealis) du nord du golfe du Saint-Laurent (divisions 4RST de l'OPANO). MPO, Document de recherche sur les pêches dans l'Atlantique, 93/20, 41 p .

In 1992, the abundance of shrimp in the Northern Gulf of St. Lawrence returned to a level that seems comparable to that of the mid 1980s. The increase in the late 1980s was due to several successive years of good recruitment. Catch rates increased as these cohorts entered the fishery and changed sex to attain the sizes targeted by fishermen. Estimated fishery recruitment (male shrimp) in 1992 stands at the average that has been observed since 1982. In 1993 and subsequently, catch rates and abundance should stabilize or diminish in step with exploitation of the abundant cohorts.

SAVARD, L., S. HURTUBISE, J.-M. SÉVIGNY, 1993. Les nouvelles unités de gestion de la pêche à la crevette nordique (Pandalus borealis) dans le nord du golfe du Saint-Laurent. MPO, Document de recherche sur les pêches dans l'Atlantique, 93/21, 32 p .

The management units for the shrimp fishery were set up in the early 1980s, on the basis of the sectors known and exploited by fishermen. However, the expansion of the fishery in the course of that decade has called into question certain of the boundaries between these management units. A restructuring of the management units is therefore proposed, to make for a better match between the shrimp aggregations they support and the sectors exploited by fishermen. The four sites where there is higher abundance of shrimp are well isolated from each other. The units support all stages of shrimp development; this is an indication of their capacity to ensure a certain level of recruitment to the fishery. The preliminary results of genetic analyses done on shrimp caught at different sites in the Gulf do not enable us to formally identify genetically distinct populations. Thus there is a mixing, which may be more or less significant, among the management units.

MOHN, R.K., D.G. PARSONS, L. SAVARD, 1992. Report of Canadian Atlantic Fisheries Scientific Advisory Committee Special Meeting, Invertebrates and Marine Plants Subcommittee, Shrimp Management Alternatives, December 5-8, 1989, Ottawa, Canada. Can. Tech. Rep. Fish. Aquat. Sci., 1884, 30 p .

Click to see all the text

A special meeting was convened by the Canadian Atlantic Fisheries Scientific Advisory Committee to review the provision of biological advice for the management of northern shrimp, Pandalus borealis. Canadian and invited international specialists reviewed the fisheries, management and supporting science for northern shrimp. Also, several scientific papers on shrimp biology and population dynamics were presented and discussed. It was concluded that it is not possible with our current data base, population models and knowledge of shrimp biology to predict the impact of management strategies in general or catch levels in particular. Thus, only responsive management is possible. The intensity of fishing (in terms of effort, exploitation or catch) could be incremented in the absence of indications of concern. The stock's response in terms of fishery performance or biological indices would need to be monitored. Once indications of negative effects were noted, a cap or roll back would be required. A set of criteria would convert the stock status, as determined by as assessment process, into a TAC recommendation for one or a few years. Short term research recommendations are mainly analytical. Simulations and population analysis to aid in defining the rules for incrementing, capping and decrementing fishing are recommended. It was concluded that field research, which has longer time horizons, should focus on the efficacy of fishing and sampling gear, and on the geographical extend of shrimp distributions as well as fundamental biology.

HURTUBISE, S., A. FRÉCHET, L. SAVARD, 1992. Les captures accessoires sur les crevettiers et les sébastiers du golfe du Saint-Laurent. CSCPCA doc. rech., 92/60, 14 p .

SAVARD, L., D. PARSONS, U. SKULADOTTIR, D. CARLSSON, P. KANNEWORFF, H. SIEGSTAD, 1992. Assessment of shrimp in Denmark Strait. NAFO SCR Doc., 92/77, 12 p .

PARSONS, D.G., L. SAVARD, D.M. CARLSSON, P. KANNEWORFF, H. SIEGSTAD, 1992. Assessment of shrimp in Davis Strait subareas 0+1. NAFO SCR Doc., 92/83, 14 p .

SIMARD, Y., J. BENOÎT, M. DESGAGNÉS, L. SAVARD, S. HURTUBISE, 1992. Atlas de la pêche à la crevette nordique (Pandalus borealis) dans le golfe du Saint-Laurent 1982-1991 : captures, effort, rendement, saison ; Atlas of the northern shrimp (Pandalus borealis) fishing in the Gulf of St. Lawrence 1982 - 1991 : catch, effort, yield, season. Rapp. tech. can. sci. halieut. aquat. ; Can. Tech. Rep. Fish. Aquat. Sci., 1900, 73 p .

Click to see all the text

The information gathered in the fishing logbooks of shrimp trawlers operating in the Gulf of St. Lawrence during 1982 to 1991 inclusively is used to generate an atlas of this important fishing activity. The data are first checked for erroneous or incomplete records. The proportion of available valid information compared to the landings at the fish plants is calculated for each of the 5 fishing management units. Simple maps of weighted catch, of available effort and yields are then computed per year and per season; March-May and June– December. Maps of best significant annual yields, based on the available data, are then calculated. Summary maps joining the information of all years follow. They are maps of : total catch, mean catch and its standard deviation, for the whole fishing period or per season; mean monthly relative catch; weighted mean yield and its standard deviation over the whole fishing period or per season.

ENNIS, J., K. DRINKWATER, P. OUELLET, P. BRUNEL, M. FRÉCHETTE, D. GAUTHIER, L. GENDRON, J. HIMMELMAN, C. HUDON, I. McQUINN, L. SAVARD, J. WORMS, 1991. Rapport de l'atelier de travail sur les invertébrés. Pages 47-54 in J.-C. Therriault (éd.). Le golfe du Saint-Laurent : petit océan ou grand estuaire? Ministère des pêches et des océans (Publ. spéc. can. sci. halieut. aquat., 113) .

SAVARD, L., S. HURTUBISE, 1991. Évaluation des concentrations de crevettes nordiques (Pandalus borealis) du nord du golfe du Saint-Laurent (divisions 4RST de l'OPANO). CSCPCA doc. rech., 91/71, 35 p .

ENNIS, J., K. DRINKWATER, P. OUELLET, P. BRUNEL, M. FRÉCHETTE, D. GAUTHIER, L. GENDRON, J. HIMMELMAN, C. HUDON, I. McQUINN, L. SAVARD, J. WORMS, 1991. Report of the Workshop on Invertebrates. Pages 47-54 in J.-C. Therriault (ed.). The Gulf of St. Lawrence : small ocean or big estuary ? Dept. of Fisheries and Oceans (Can. Spec. Publ. Fish. Aquat. Sci., 113) .

PARSONS, D.G., R.E. CRAWFORD, L. SAVARD, E.L. DALLEY, 1991. Aspects of the distribution and behaviour of northern shrimp (Pandalus borealis) affecting survey design and stock assessment. ICES C.M., 1991/K:42, 10 p .

SKULADOTTIR, U., L. SAVARD, K. LEHMANN, D.G. PARSONS, D.M. CARLSSON, 1991. Preliminary assessment of shrimp in Denmark Strait. NAFO SCR Doc., 91/96, 24 p .

SAVARD, L., I.H. McQUINN, D.G. PARSONS, 1991. Investigating the potential of sequential population analysis for northern shrimp (Pandalus borealis) in division 0A. NAFO SCR Doc., 91/71, 12 p .

SIMARD, Y., L. SAVARD, 1990. Variability, spatial patterns and scales of similarity in size-frequency distributions of the Northern shrimp (Pandalus borealis) and its migrations in the Gulf of St. Lawrence. Can. J. Fish. Aquat. Sci., 47: 794-804 .

SIMARD, Y., L. SAVARD, 1989. A multivariate approach to study the variability and structure of length-frequency distributions : an example with the Gulf of St. Lawrence Northern shrimp population. NAFO SCR Doc., 89/97, 7 p .

SAVARD, L., 1989. Évaluation des concentrations de crevettes (Pandalus borealis) du golfe du Saint-Laurent. CSCPCA doc. rech., 89/7, 71 p .

SAVARD, L., D.G. PARSONS, D.M. CARLSSON, 1989. Age and growth of Northern shrimp (Pandalus borealis) in Davis Strait (NAFO SA 0+1). NAFO SCR Doc., 89/94, 14 p .

MOHN, R.K, L. SAVARD, 1989. Length based population analysis of Sept-Ìles shrimp (Gulf of St. Lawrence). NAFO SCR Doc., 89/92, 12 p .

PARSONS, D.G., L. SAVARD, 1989. Some observations on modal analysis of shrimp length frequency distributions. NAFO SCR Doc., 89/93, 6 p .

SAVARD, L., Y. LAVERGNE, J. LAMBERT, 1988. Évaluation des stocks de crevette (Pandalus borealis) du golfe du Saint-Laurent. CSCPCA doc. rech., 88/60, 49 p .

Shrimpo (Pandalus borealis) landings in the Gulf of St. Lawrence almost reached 12 000 tons in 1987 which is an increase of 25 % relative to 1986. All area catches increased in variable proportions and quotas were caught in the North-Anticosti and Estuary areas. The status of the northern Gulf of St. Lawrence shrimp populations seems to be good. Commercial fleet catch rates have been stable whithin years. Spring biomass estimates obtained from an experimental survey done in 1987 have not shown a decrease in the abundance of populations. Demographic structures obtained in the abundance of populations. Demographic structures obtained from commercial sampling have not shown strong changes in these population dynamics. However, in Sept-Iles, sex inversion happened at a smaller size in 1987 than in 1982. Given that catches have continued to increase for all areas, that catch rates have been stable and, that spring biomass has been relatively high, recommanded TAC's in 1987 should still be appropriate for the 1988 fishing season.

CARLSSON, D.M., D.G. PARSONS, L. SAVARD, 1988. Modal analysis for Davis Strait shrimp samples. NAFO SCR Doc., 88/67, 5 p .

ARCHAMBAULT, D., Y. LAVERGNE, L. SAVARD, 1987. Évaluation des populations de crevette (Pandalus borealis) des zones de pêche du golfe du Saint-Laurent. CSCPCA doc. rech., 87/31, 47 p .

OUELLET, P., L. SAVARD, 1986. Évaluation des populations de crevettes (Pandalus borealis) des zones de pêche du golfe du Saint-Laurent. CSCPCA doc. rech., 86/19, 52 p .

For the entire Gulf of St. Lawrence, shrimp landings have increased by more than 1 300 t from 1984 to 1985 due to higher catches in the Sept-Îles and North Anticosti areas. Landings from the Sept-Îles area reached an all time high of 4 151 t in 1985, an increase of 5 % compared with 1984. Increased effort in 1985 (11 %) would explain this increase in catch as the catch rates are the same for the two years (68 kg/hr). The fall 1985 biomass survey gave the highest biomass estimate since the 1980 survey. The analysis of the population structure indicated relatively more important modal classes I and II compared to the previous year. All indices suggest that the shrimp population in the Sept-Îles area has been stable since 1980 and little change is anticipated for 1986. Landings in the North Anticosti area more than doubled between 1984 and 1985. Commercial catch rates were 100 kg/gr, the highest since 1982. Increased relative abundance of modal class III (already observed as abundant as modal class II in 1984) would explain these increased catch and catch rates for the last fishing season. The fall 1985 biomass estimate also increased compared with 1984, but proportially less than the commercial catch rates did. The analysis of the population structure showed average modal class II abundance but higher than usual abundance of modal class I. Indices of stock status suggest that catch rates should remain high in 1986. Landings for the Esquiman Channel area slightly lower in 1985 than in 1984. Problems with the commercial statistics prevented the calculation of a commercial catch rate reflective of stock status for 1985. However, the biomass estimate from research survey in the autumn of 1985 confirmed the 1984 results that indicated a decreased abundance for that population.