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Bibliography of the Maurice Lamontagne Institute

Diane ARCHAMBAULT

TRZCINSKI, M.K., C. den HEYER, S. ARMSWORTHY, S. WHORISKEY, D. ARCHAMBAULT, M. TREBLE, M. SIMPSON, J. MOSSMAN, 2011. Pre-COSEWIC Review of Atlantic Halibut (Hippoglossus hippoglossus) on the Scotian Shelf and Southern Grand Banks (Divs. 3NOPs4VWX5Zc), Gulf of St. Lawrence (Divs. 4RST), Newfoundland and Labrador, and Central and Arctic. DFO, Canadian Science Advisory Secretariat, Research Document ; MPO, Secrétariat canadien de consultation scientifique, Document de recherche, 2011/030, 83 p .

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All data relevant to the status of the Atlantic halibut, Hippoglossus hippoglossus, in Canadian waters were gathered from four DFO regions: Maritimes, Gulf, Newfoundland, and Quebec with the objective of providing information to the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) for their review. In particular, data on life history, habitat, landings, surveys, and bycatch were collated. Correction factors for gear changes in the groundfish surveys were not applied and the results on distribution and trends need to be interpreted with caution. This assumption is probably adequate for most regions as correction factors for flatfish were small, but the gear change to a Campelen trawl in Newfoundland could have a large effect and is unquantified. Halibut continue to be rare on Georges Bank and in the eastern Arctic, their distribution has expanded in the Gulf, but their distribution on the Scotian Shelf and the southern Grand Banks has not changed appreciably. Little is known about the timing and location of halibut spawning, and the location and movement of eggs and larvae. A simple linear regression was fit to the groundfish survey data in each region over the entire survey time period. No trends were calculated for the southern Grand Banks because gear changes were large and no correction factor has been estimated. There was no change in halibut catch rates on the Scotian Shelf and significant increases in the northern and southern Gulf of St. Lawrence. Trends, calculated as the percent difference between the mean catch rate in the first five years in the time series and the last five years of the survey were increasing on the Scotian Shelf (74 %) and the northern and southern Gulf of St. Lawrence (>200 %).

ARCHAMBAULT, D., C. CYR, 2011. Processus consultatif scientifique régional portant sur l’évaluation de la pêche au concombre de mer dans l’estuaire et le nord du golfe du Saint-Laurent, 5 mai 2011, Institut Maurice-Lamontagne, Mont-Joli, Qc ; Regional Science Advisory Process on the assessment of the sea cucumber fishery in the Estuary and Northern Gulf of St. Lawrence, May 5, 2011, Maurice Lamontagne Institute, Mont-Joli, Qc. MPO, Secrétariat canadien de consultation scientifique, Série des comptes rendus; DFO, Canadian Science Advisory Secretariat, Proceedings Series, 2011/019, 17 p .

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ARCHAMBAULT, D., 2011. Stock assessment of Atlantic Halibut of the Gulf of St. Lawrence (NAFO Division 4RST) for 2009 and 2010. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2011/012, 20 p .

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ARCHAMBAULT, D., 2011. Évaluation du stock de flétan atlantique du golfe du Saint-Laurent (division OPANO 4RST) pour 2009 et 2010. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2011/012, 18 P .

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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 .

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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.

KENCHINGTON, E., C. LIRETTE, A. COGSWELL, D. ARCHAMBAULT, P. ARCHAMBAULT, H. BENOIT, D. BERNIER, B. BRODIE, S. FULLER, K. GILKINSON, M. LÉVESQUE, D. POWER, T. SIFERD, M. TREBLE, V. WAREHAM, 2010. Delineating coral and sponge concentrations in the biogeographic regions of the East Coast of Canada using spatial analyses ; Délimitation des concentrations de corail et d'éponge dans les régions biogéographiques de la côte est du Canada au moyen de l'analyse spatiale. DFO, Canadian Science Advisory Secretariat, Research Document ; MPO, Secrétariat canadien de consultation scientifique, Document de recherche, 2010/041, 208 p .

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Concentrations of sea pens, small and large gorgonian corals and sponges on the east coast of Canada have been identified through spatial analysis of research vessel survey by-catch data following an approach used by the Northwest Atlantic Fisheries Organization (NAFO) in the Regulatory Area (NRA) on Flemish Cap and southeast Grand Banks. Kernel density analysis was used to identify high concentrations. These analyses were performed for each of the five biogeographic zones of eastern Canada. The largest sea pen fields were found in the Laurentian Channel as it cuts through the Gulf of St. Lawrence, while large gorgonian coral forests were found in the Eastern Arctic and on the northern Labrador continental slope. Large ball-shaped Geodia spp. sponges were located along the continental slopes north of the Grand Banks, while on the Scotian Shelf a unique population of the large barrel-shaped sponge Vazella pourtalesi was identified. The latitude and longitude marking the positions of all tows which form these and other dense aggregations are provided along with the positions of all tows which captured black coral, a non-aggregating taxon which is long-lived and vulnerable to fishing pressures.

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. .

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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

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 .

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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.

LÉVESQUE, M., P. ARCHAMBAULT, C.W. McKINDSEY, S. VAZ, D. ARCHAMBAULT, 2010. Predictive benthic habitat suitability model for the Estuary and northern Gulf of St. Lawrence (2006). Can. Tech. Rep. Fish. Aquat. Sci., 2893, 27 p .

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This study used geostatistical techniques and a generalized linear model (GLM) approach to describe the affinity of macrofaunal communities to environmental parameters in the Estuary and the northern Gulf of St. Lawrence using bycatch and environmental data from 2006. The habitat suitability model (HS) derived from those data explained nearly 40 % of the variation in macrofaunal communities, with the significant predictive environmental variables being depth, oxygen saturation, temperature, and bottom current. Results from the prediction model therefore allowed the identification of zones of greater and lesser suitability for specific species community types, higlighted by canonical analysis. This study also assembled a primary database of benthic habitats and physical parameters for the St. Lawrence system. An annual update of this database will thus be possible following the multispecific surveys.

BOURDAGES, H., ARCHAMBAULT, D., BERNIER, B., FRECHET, A. GAUTHIER, J. GREGOIRE, F, LAMBERT, J, L. SAVARD, 2010. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d’août 2010 dans l’estuaire et le nord du golfe du Saint-Laurent ; Preliminary results from the groundfish and shrimp multidisciplinary survey in August 2010 in the Estuary and northern Gulf of St. Lawrence. MPO, Secrétariat canadien de consultation scientifique, Série des comptes rendus ; DFO, Canadian Science Advisory Secretariat, Proceedings Series, 2010/107, 98 p .

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In 2010, 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 2nd to September 1st onboard the CCGS Teleost. One of the primary objectives was to estimate abundance indices for the main groundfish species (particularly cod, Greenland halibut, Atlantic halibut and redfishes - fasciatus and mentella-), and for the Northern shrimp, and to identify the spatial distribution and biological characteristics of these species. Other objectives included monitoring the biodiversity of Estuary and the northern Gulf and describing oceanographic conditions observed in August. This report describes preliminary results on the catch rates and distribution of 18 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 to the tandem CCGS Teleost-Campelen. In 2010, the abundance and biomass indices of many species were stable or decreased compared to 2009. In fact, the two redfish species (Sebastes fasciatus and S. mentella), cod, black dogfish, white hake and longfin hake show index values below the historical series means. Even if the Northern shrimp and snow crab indices presented a small decrease, they were in the range of the historical series means. Six species (Atlantic Halibut, Greenland Halibut, hagfish, American Plaice, witch, thorny skate) showed an increase for their indices in 2010. Except for Greenland Halibut, the indices for these species were among the highest values of their respective historical series. Besides the fact that no fishing activities took place along the southwestern part of Newfoundland due to mechanical problems, the geographic distributions of catches recorded for the different species in 2010 showed the same pattern as in previous years.

ARCHAMBAULT, D., 2009. Stock assessment of Atlantic halibut of the Gulf of St. Lawrence (divisions 4RST) in 2008. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2009/023, 14 p .

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ARCHAMBAULT, D., 2009. Évaluation du stock de flétan atlantique du golfe du Saint-Laurent (divisions 4RST) en 2008. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2009/023, 15 p .

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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 .

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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.

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. .

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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.

ARCHAMBAULT, D., 2007. Stock assessment of Atlantic halibut of the Gulf of St. Lawrence (NAFO divisions 4RST) in 2006. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2007/007, 13 p .

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BUSBY, C.D., M.J. MORGAN, K.S. DWYER, G.M. FOWLER, R. MORIN, M. TREBLE, D.M. PARSONS, D. ARCHAMBAULT, 2007. Review of the structure, the abundance and distribution of American plaice (Hippoglossoides platessoides) in Atlantic Canada in a species-at-risk context ; Examen de la structure, de l'abondance et de la répartition de la plie canadienne (Hippoglossoides platessoides) dans l'Atlantique canadien, dans le contexte des espèces en péril. DFO, Canadian Science Advisory Secretariat, Research Document ; MPO, Secrétariat canadien de consultation scientifique, Document de recherche, 2007/069, 94 p .

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The structure, abundance and distribution of six stocks of American plaice (Hippoglossoides platessoides) in Canadian waters were reviewed by Fisheries and Oceans Canada (DFO) under the terms of reference for the Committee on Status of Endangered Wildlife in Canada (COSEWIC) species-at-risk. The American plaice population structure was evaluated to ascertain if the current management units, which are primarily based on life history traits of the species, are indicative of ‘Designatable Units’ (DUs) at the species level. Life history traits, survey distributions, including the location of spawning fish, abundance indices and biological information (length at age, age/length at maturity and year-class strengths) were inconclusive in assigning DUs to the management areas. Therefore, information for each area is presented separately and abundance trends are modeled for progressively grouped combinations of stock components, culminating with one for the Canadian northwest Atlantic. All stocks underwent declines and in stocks where data was sufficient for analysis, the overall model suggested declines in the range of 86.4 to 94.8 %. Exploitation is likely the main cause of decline, although increase in natural mortality played a role in some areas. Since the rapid decline all stocks have remained at low abundance levels. Three spatial indices were calculated: the design-weighted area of occupancy (DWAO), the minimum area occupied by 95 % of the stock (D95) and the Gini index of aggregation.

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 .

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[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.

ARCHAMBAULT, D., 2007. Évaluation du stock de flétan atlantique du golfe du Saint-Laurent (divisions OPANO 4RST) en 2006. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2007/007, 14 p .

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ARCHAMBAULT, D. ARCHAMBAULT, D., 2005. Atlantic halibut of the Gulf of St. Lawrence (4RST) in 2004. DFO, Canadian Science Advisory Secretariat, Science Advisory Report, 2005/013, 8 p .

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ARCHAMBAULT, D., 2005. Flétan atlantique du golfe du Saint-Laurent (4RST) en 2004. MPO, Secrétariat canadien de consultation scientifique, Avis scientifique, 2005/013, 9 p .

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ARCHAMBAULT, D., 2004. Atlantic Halibut of the Gulf of St. Lawrence (4RST) – Update (2003). Science, Stock Status Report, 2004/013, 7 p .

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ARCHAMBAULT, D., 2004. Flétan atlantique du golfe du Saint-Laurent (4RST) –Mise à jour 2003. Rapport sur l'état des stocks, 2004/013, 8 p .

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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 .

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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.

ARCHAMBAULT, D., 2003. Atlantic halibut ot the Gulf of St. Lawrence (4RST) - Update (2002). Science, Stock Status Report, 2003/006, 7 p .

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ARCHAMBAULT, D., 2003. Flétan atlantique du golfe du Saint-Laurent (4RST). Mise à jour 2002. Rapport sur l'état des stocks, 2003/006, 8 p .

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ARCHAMBAULT, D., 2002. Atlantic halibut of the Gulf of St. Lawrence (Divisions 4RST) - Update (2001). Science, Stock Status Report, A4-02, 7 p .

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ARCHAMBAULT, D., 2002. Le flétan atlantique du golfe du Saint-Laurent (divisions 4RST) - Mise à jour (2001). Rapport sur l'état des stocks, A4-02, 7 p .

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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 .

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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.

ARCHAMBAULT, D., 2001. Atlantic halibut of the Gulf of St. Lawrence (divisions 4RST) - Update (2000). Science, Stock Status Report, A4-02, 6 p .

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ARCHAMBAULT, D., 2001. Le flétan atlantique du golfe du Saint-Laurent (divisions 4RST) - Mise à jour (2000). Rapport sur l'état des stocks, A4-02, 6 p .

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ARCHAMBAULT, D., 2000. Atlantic halibut of the Gulf of St. Lawrence (divisions 4RST). Science, Stock Status Report, A4-02, 11 p .

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ARCHAMBAULT, D., 2000. Le flétan atlantique du golfe du Saint-Laurent (divisions 4RST). Rapport sur l'état des stocks, A4-02, 12 p .

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ARCHAMBAULT, D., 1999. Atlantic halibut of the Gulf of St. Lawrence (Divisions 4RST). Science, Stock Status Report, A4-02, 9 p .

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ARCHAMBAULT, D., 1999. Le flétan atlantique du golfe du Saint-Laurent (divisions 4RST). Rapport sur l'état des stocks, A4-02, 9 p .

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ARCHAMBAULT, D., 1996. Le flétan atlantique du golfe. MPO, Pêches de l'Atlantique, Rapport sur l'état des stocks, 96/57, 8 p .

ARCHAMBAULT, D., F. GRÉGOIRE, 1996. Revue des données historiques de pêche du flétan atlantique du golfe du Saint-Laurent (Divisions de l'OPANO 4RST) (1893-1995). MPO, Secrétariat canadien pour l'évaluation des stocks, Document de recherche, 96/56, 43 p .

The landings of Atlantic halibut from the Gulf reached their lowest level ever seen in 1995, the reported catches of 83 t representing barely one quarter of the 300 t preventive TAC. The fishery in 1995 was similar to previous years : 1) most of the landings were made by Québec based vessels fishing in NAFO divisions 4S and 4T; 2) most of the fishery took place in the summer with fixed gears, longlines and gillnets. Since 1994, over twothirds of the landings (by weight/by numbers?) are composed of halibut less than 81 cm in length. In 1995, the proportion of these small fish has substantially increased in the landings of shrimp trawls and gillnets. However, the size and age compositions of halibuts remained broad. The young cohorts born in 1987-1989, clearly visible in 1994, are well represented in the landings of 1995. Although variable from year to year, growth rates of halibut in the Gulf is about 7.8 to 8.8 cm/year, being usually faster for the females.

ARCHAMBAULT, D., 1996. Atlantic halibut in the Gulf of St. Lawrence. DFO, Atlantic Fisheries, Stock Status Report, 96/57, 8 p .

ARCHAMBAULT, D., 1995. Le flétan atlantique du golfe du Saint-Laurent en 1994. MPO, Pêches de l'Atlantique, Document de recherche, 95/52, 17 p .

For 1994, the fishing pattern for Atlantic halibut of the Gulf (Divisions 4RST) was still the same than 1993, i.e. : 1) total landings less than the precautionary TAC of 300 t; 2) landings mainly made by the Quebec fleet, the 4T division being that one where the catches were the highest; 3) summer fishing practising dominated by the longliners. The Atlantic halibut landings for 1994 included a big proportion of fish (almost 66 %) lengthening less than 81 cm. Even if the length structure and the age classes range were still wide and relatively stable, we observed the apparition of a relatively important proportion, especially for the mobile fleet, of small halibut (35-55 cm) aged between 5 to 7 years. The growth rate measured for the Gulf halibut, of the order of 7,75 cm/year, was comparable to that observed for the Canadian Atlantic halibut outside of the Gulf.

GRÉGOIRE, F., S. HURTUBISE, D. ARCHAMBAULT, R. MORNEAU, H. BOUCHARD, 1995. Analyses des données de pêche et de recherche sur le capelan (Mallotus villosus) du golfe du Saint-Laurent. MPO, Pêches de l'Atlantique, Document de recherche, 95/55, 64 p .

Annual landings of capelin in Divisions 4RST remained stable and inferior to 2,000 t until 1977. The new market for ovigerous females is responsible for the recent increase. Landings increased to almost 10,000 t in 1978, 1979 and 1989 and have remained at over 6,000 t since then. During the last two years, the most significant subdivisions in terms of landings were 4Rc, 4Sw and 4Tp. Only two or three age groups dominate capelin catches by age in Division 4R. Also in this division, catches by length indicate a decrease in the size of male and female capelin caught over the last few years. Capelin bycatch during winter groundfish assessment surveys was especially significant in the Esquiman Channel. During summer surveys, capelin were caught all over the northern Gulf. However, greater concentrations were ovserved west and east of Anticosti Island and on the west coast of Newfoundland. At present, on account of limited resources, there are not sufficient data to carry out an assessment of capelin biomass in the Gulf. In the meantime, further study could be conducted on the capelin data obtained during annual groundfish and shrimp assessment surveys.

KOELLER, P., B. McCALLUM, D. SWAIN, M. STRONG, D. ARCHAMBAULT, S.J. WALSH, 1994. Accuracy and precision of scannar data recorded on canadian groundfish surveys. Can. Tech. Rep. Fish. Aquat. Sci., 1983, 39 p .

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It is important to determine the accuracy and precision of SCANMAR data collected during groundfish assessment surveys, particularly since perception of poor quality data and reliability is one of the reasons why this information has not found wider use in stock assessments. Edit criteria for raw data are described and used to distinguish valid from invalid data collected during surveys in three Atlantic Regions by three different laboratories. Despite variable data quality and a relatively high number of invalid readings per measured fishing set the number of valid data transmissions received during each set is more than adequate for determining trawl performance and calculating swept area for most survey sets. Nine SCANMAR acoustic sensors with a wide range of operational history, ranging from new to over 500 fishing sets were calibrated and showed only small differences between measured and true values. However, one older sensor showed a tendency to overshoot the test distance and a relatively slow reaction time, suggesting that periodic calibration checks should be undertaken.

ARCHAMBAULT, D., 1994. Le flétan atlantique des Divisions 4RST. MPO, Pêches de l'Atlantique, Document de recherche, 94/35, 24 p .

For the last fifteen years, Atlantic halibut landings have rarely exceeded 300 mt, level at which the precautionary TAC was established in 1988. The Québec fleet is the main proponent in this fishery. Most landings come from Division 4T, and they occur mainly during the 2nd and 3rd quarters of the year. Longline is the main gear used in the fishery. The lengths of fish captured by the commercial fishery and research surveys are similar, varying mainly between 40 and 140 cm. Ages vary between 3 and 18 years for males, reaching up 26 years for females. The distribution of fish from the research surveys shows a definite seasonal pattern : in summer fish are mostly concentrated along the 185 m isobath in the Northern Gulf whereas in winter, fish are found mostly in deep water of the Esquiman and Laurentian Channels.

SÉVIGNY, J.-M., G. ROSS, D. ARCHAMBAULT, É. PARENT, 1992. Genetic variation in Greenland halibut (Reinhardtius hippoglossoides) from the St. Lawrence system and Northwest Atlantic. CAFSAC Res. Doc., 92/99, 21 p .

An allozyme study was conducted to determine if Greenland halibut from the Gulf of St. Lawrence and the Northwest Atlantic area belong to genetically differentiated populations. Genetic variations were studied at 13 loci coding for 10 proteins. Results show a low degree of genetic differentiation in this species. Genetic differentiation among age groups within sampling sites is also weak, suggesting that the observed structure is temporally stable.

SAINTE-MARIE, B., V. LAPOINTE, D. ARCHAMBAULT, R. DUFOUR, 1992. Distribution spatiale et structure de taille du crabe des neiges, Chionoecetes opilio (O. Fabricius), dans le fjord du Saguenay. Rapp. manus. can. sci. halieut. aquat., 2156, 12 p .

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Exploratory fishing with baited traps was conducted in the Saguenay Fjord in July and August 1988 to determine whether or not Chionoecetes opilio occurred there and, if need be, to estimate the size of the population. The C. opilio in the Saguenay Fjord constitute a breeding population and there is local recruitment of juveniles. Mingling of individuals from C. opilio populations in the Fjord and in the Saint Lawrence Estuary may be limited by the 20-m deep external sill and by marked stratification of the water column. The population of C. opilio is apparently small and is in a quasi-virgin state.

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 .