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Bibliography of the Maurice Lamontagne Institute

Jean-François OUELLET

BOURDAGES, H., J.-F. OUELLET, 2011. Répartition géographique et indices d’abondance des poissons marins du nord du golfe du Saint-Laurent (1990–2009). Rapp. tech. can. sci. halieut. aquat. ; Can. Tech. Rep. Fish. Aquat. Sci., 2963, 171 p .

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The multidisciplinary survey of groundfish and shrimp in the northern Gulf of St. Lawrence has been conducted every August by Fisheries and Oceans Canada for more than two decades. The results of this survey are archived in a database containing information on a variety of georeferenced variables related to the abundance and biological parameters of the taxa caught. This database can be used to analyze the demographics of a wide variety of fish and invertebrate taxa in a spatial and temporal framework. The purpose of this work was to compile the spatial distribution and abundance indicators as well as the biological parameters for fish taxa caught during the survey period. This report presents the results for 115 fish taxa.

DUTIL, J.-D., C. DION, L. GAMACHE, R. LAROCQUE, J.- F. OUELLET, 2010. Ration and temperature effects on the condition of male adolescent molter and skip molter snow crab. J. Shellfish Res., 29(4): 1025-1033 .

This study examined the effects of ration and temperature on the molt of male adolescent snow crab Chionoecetes opilio (O. Fabricius, 1788). In one experiment, crabs were exposed to 1 of 4 treatments, 2 levels of ration and 2 levels of temperature. In a second experiment, all crabs were fed and a 4-level factor was addressed in which temperature was held constant as in experiment 1 (2 levels) or switched from one level to the other. Food consumption declined significantly and at a similar rate over time at both temperatures, several weeks before molt took place. Larger crabs molted to morphometric maturity in a greater proportion with no influence of ration or temperature. Smaller crabs also molted earlier than larger crabs. Temperature had a marked effect on the timing of molt, with crabs kept at a higher temperature molting 1 mo earlier and crabs exposed to shifted temperatures, molting midway between the two other groups. Body density decreased markedly at ecdysis, but was also influenced by ration and temperature particularly in nonmolters; the effect of ration on body density in nonmolters was highly significant. Ration also had a major effect on the size of muscle and digestive gland and their moisture content. Unfed nonmolters were in poor condition, particularly at a higher temperature, whereas molted crabs had large digestive glands associated with high moisture contents, irrespective of treatment. Timing of the migration of snow crabs to shallow and potentially warmer waters in the spring in the Gulf of St. Lawrence might be determined in part by molt requirements. Cold temperatures provide an energetic advantage during the premolt period, when food consumption decreases, but high temperatures result in an earlier molt and a fast recovery during the early postmolt eriod.©2010 Journal of Shelfish Research.

OUELLET, J.-F., DUTIL, J.-D., T. HURLBUT, 2010. Wolffish (Anarhichas sp.) landings in the estuary and Gulf of St. Lawrence(1960-2009)recorded in commercial fisheries statistics Débarquements de loups (Anarhichas sp.) dans l’estuaire et le golfe du Saint–Laurent (1960-2009) selon les statistiques de pêche commerciale. DFO, Canadian Science Advisory Secretariat, Research Document ; MPO, Secrétariat canadien de consultation scientifique, Document de recherche, 2010/125, 38 p .

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Commercial landings data for the wolffishes (Anarhichas denticulatus, Anarhichas minor and Anarhichas lupus) were compiled from Northwest Atlantic Fisheries Organization (NAFO) and Zonal Interchange File Format (ZIFF) files for NAFO divisions 4RST. In both datasets, the landing data were not broken down by species for the period from 1960 to 2004, which precludes species-specific analyses. Since 2005, most landing reports have identified the species landed but fishermen have only been permitted to land Atlantic wolffish (A. lupus). The NAFO statistics indicate that wolffish landings in NAFO divisions 4RST averaged 216 metric tons per year during the period 1960–1998 and the ZIFF statistics indicate an average of 100 metric tons per year during the time period 1985-2009. The reported landings of wolffish occurred mainly during fishing activities directed toward Atlantic cod (Gadus morhua) and 3 species of flatfish. In the ZIFF statistics, the majority of the landings were from division 4R (80.7% of total landed catch in weight, with 13.1% from 4S and only 6.1% from 4T). Subdivisions 4Rb, 4Rc and 4Rd were the hotspots with an average landed catch of 2,112 kg per year per 1,000 km2 for the three species and three sub-divisions combined. Throughout the time series covered by the NAFO statistics (1960–1998) hook and line gears, primarily longlines, were the most important gears followed by bottom trawls. In the ZIFF statistics, which cover a more recent time period than the NAFO statistics (i.e., 1985–2009), longlines and gillnets collectively contributed two thirds of the total number of reports of wolffish landings with longlines accounting for as much as 72.0% of the total landed catch in weight. There was a significant negative trend in LPUE over the period from 1985 to 2009 in 4RST; a similar pattern was observed in the three sub-divisions where longline landings and LPUE were greatest (4Rb, 4Rc, and 4Rd).