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Bibliography of the Maurice Lamontagne Institute

Jean-Pierre ALLARD

OUELLET, P., J.-P. ALLARD, 2006. Vertical distribution and behaviour of shrimp Pandalus borealis larval stages in thermally stratified water columns: laboratory experiment and field observations. Fish. Oceanogr., 15(5): 373-389 .

By combining field data and laboratory observations of larvae in a simulated thermal gradient, we described the ontogenetic changes in vertical distribution and behaviour of early stages of shrimp Pandalus borealis in thermally stratified water columns. Both in the laboratory and at stations in the north-western Gulf of St Lawrence, the first two larval stages appear to actively select and maintain a position in the upper layer of warmer temperatures, within the thermocline and above the cold (<1 °C) intermediate layer. Stage III larvae were distributed deeper in the water column and in colder waters than the previous two stages. Stage IV and V larvae showed the highest degree of swimming activity in the laboratory and a much wider range (from surface to ˜200 m) in vertical distribution in the field. The shift to deeper waters and settlement to the bottom habitat appears to happen after the fifth moult, at stage VI. We propose that the pattern of vertical distribution in the field reflects the adjustment of the different developmental stages to the distribution of preferred prey. The description of the ontogenetic change in the vertical distributions and movements of early stages of P. borealis should be valuable information for future attempts to model larval transport and dispersion, and for detecting settlement/recruitment areas using 3D ocean circulation models. The identification of the thermal habitat of the different larval stages and the timing for settlement at the bottom also provides important information for the development of temperature-dependent growth models up to the first juvenile stages. ©2006 Her Majesty in Right Canada

OUELLET, P., J.-P. ALLARD, 2002. Seasonal and interannual variability in larval lobster Homarus americanus size, growth and condition in the Magdalen Islands, southern Gulf of St. Lawrence. Mar. Ecol. Prog. Ser., 230: 241-251 .

OUELLET, P., D. LEFAIVRE, J.-P. ALLARD, 2001. Abondance des larves de homard (Homarus americanus) et disponibilité des post-larves pour l'établissement benthique aux Îles-de-la-Madeleine, sud du golfe du Saint-Laurent (Québec). Pages 17-21 in M.J. Tremblay & B. Sainte-Marie (eds.). Symposium sur le Programme intégré sur le homard canadien et son environnement (PINHCE): résumés et sommaire des travaux. Rapp. tech. can. sci. halieut. aquat., 2328, 130 p .

OUELLET, P., D. LEFAIVRE, J.-P. ALLARD, 2001. Lobster (Homarus americanus) abundance and post-larvae availability to settlement at the Magdalen Islands, southern Gulf of St. Lawrence (Quebec). Pages 14-18 in Tremblay M.J. & B. Sainte-Marie (eds.). Canadian Lobster Atlantic Wide Studies (CLAWS) Symposium : abstract and proceedings summary. Can. Tech. Rep. Fish. Aquat. Sci., 2328, 130 p .

OUELLET, P., J.-P. ALLARD, J.-F. ST-PIERRE, 1994. Distribution des larves d'invertébrés décapodes (Pandalidae, Majidae) et des oeufs et larves de poissons dans le nord du golfe du Saint-Laurent en mai et juin de 1985 à 1987 et 1991-1992. Rapp. tech. can. sci. halieut. aquat., 2019, 60 p .

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From 1985 to 1987, and in 1991 and 1992, seven plankton surveys were conducted, between the end of April and early July in the northern gulf of S t. Lawrence. These missions provide informations on the species composition and the distribution of larvae of invertebrate decapods and of the eggs and larvae of fish species. A total of 28 species from 13 families (2 families of decapods and 11 fadies of fishes) were enumerated from these surveys. The larvae of the shrimp Pandalus spp. and crabs (Chionoecetes opilio andlor Hyas spp.) are the first to be found in large numbers in the northern Gulf. Moreover, the decapod larvae were always more abundant than the larval ichthyoplankton. The larvae of sandlances (Ammudytes spp.) and redfishes (Sebastes spp.) dominated the larval fish fauna. In May, in the northern Gulf, fish eggs were mostly represented by the eggs of the Atlantic cod (Gadus mrhua) and witch flounder (Glyptocephalus cynoglossus). The analysis of cod egg distribution from 1985 to 1987 revealed that there was simultaneous spawning events occuring in each sector, as soon as early-May, possibly from independent reproductive units of the northern Gulf cod population.