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Bibliographie de l'Institut Maurice-Lamontagne

Poissons / Solea solea / Sole commune

FRABOULET, E., Y. LAMBERT, R. TREMBLAY, C. AUDET, 2011. Growth and lipid composition of winter flounder juveniles reared under natural and fixed photoperiod and temperature conditions. N. Am. J. Aquacult., 73(2): 89-96.

[Résumé disponible seulement en anglais]
In age-0 winter flounder Pseudopleuronectes americanus, a fixed long photoperiod (14.5 h light : 9.5 h dark) applied during the first 45 d postsettlement did not improve growth compared with fish held under natural photoperiod conditions. After being reared under these two regimes until 29 October, juveniles exposed to the long photoperiod after settlement were maintained under the same conditions during the winter, but temperature was not allowed to decrease below 4 C. Juveniles previously exposed to the natural photoperiod were maintained under one of the following conditions: (1) natural photoperiod and natural temperature (1–9 °C), (2) natural photoperiod and a minimum winter temperature of 4 °C, or (3) long photoperiod and a minimum temperature of 4 °C. Most mortality (80&nsp;%) occurred within the first 2 months of the experiment. Juveniles that experienced the transition from natural to long photoperiod conditions displayed higher growth through the winter than did juveniles exposed to natural conditions; at the end of winter, fish that were transitioned to the long photoperiod were 25&nsp;% longer (19 mm), were twice as heavy (125 mg), and contained twice as much total lipids (803 μg/mg) and five times more triacylglycerols (24 % of total lipids) than juveniles subjected to the natural photoperiod. These results indicate that we may be able to eliminate the winter fasting that occurs under natural conditions and to elicit winter growth in this species by using photoperiod manipulation. In addition, it appears that a decrease in photoperiod is needed for fish to respond to a subsequent increase in photoperiod.©2011 American Fisheries Society

FRABOULET, E., Y. LAMBERT, R. TREMBLAY, C. AUDET, 2010. Assessment of paternal effect and physiological cost of metamorphosis on growth of young Winter Flounder Pseudopleuronectes americanus juveniles in a cold environment. J. Fish. Biol., 76(4): 930-948.

[Résumé disponible seulement en anglais]
This study assessed the paternal effects on the growth of early juvenile winter flounder Pseudopleuronectes americanus and examined the energy allocation strategy employed during this critical stage. Males from three different locations (Passamaquoddy Bay, Baie-des-Chaleurs and the St Lawrence Estuary) were crossed with females from the Baie-des-Chaleurs, and the growth characteristics of hybrids from settlement to 45 days post-settlement were monitored under similar culture conditions. Young juveniles displayed good growth rates (0·09 ± 0·02 mm day-1), with no differences related to sire origin, in terms of growth indicators (length, width, RNA:DNA and triacylglycerol:sterol ratios), condition indices (Fulton’s K, pigmentation and fin erosion) and biochemical components (nucleic acids, proteins and lipid classes). These results suggest the absence of a paternal contribution to the growth strategy during the early juvenile stage of P. americanus. The results also highlight the high energetic cost associated with metamorphosis: young juveniles mobilized most of their triacylglycerol reserves during the growth period following settlement.© 2010 The Fisheries Society of the British Isles

KOUTSIKOPOULOS, C., L. FORTIER, J.A. GAGNÉ, 1991. Cross-shelf dispersion of Dover sole (Solea solea) eggs and larvae in Biscay Bay and recruitment to inshore nurseries. J. Plankton Res., 13: 923-945 .