Contenu archivé

L’information archivée est fournie à des fins de référence, de recherche ou de tenue de documents. Elle n’est pas assujettie aux normes Web du gouvernement du Canada et n’a pas été modifiée ou mise à jour depuis son archivage. Pour obtenir cette information dans un autre format, veuillez communiquer avec nous.

Bibliographie de l'Institut Maurice-Lamontagne

Poissons / Pseudopleuronectes americanus / Plie rouge, Carrelet, Sole

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

BENOÎT, H.P., T. HURLBUT, J. CHASSÉ, 2010. Assessing the factors influencing discard mortality of demersal fishes using a semi-quantitative indicator of survival potential. Fish. Res., 106: 436-447.

[Résumé disponible seulement en anglais]
Understanding the factors affecting the likelihood that discarded fish will die can contribute to better management of resources by enhancing the potential for successful live release and by improving the estimation of otherwise unaccounted fishing mortality. Semi-quantitative measures of individual fish vitality or physical condition, obtained by at-sea observers aboard commercial fishing vessels, are often used as an indicator of survival potential for discarded fish. The present study and previous ones have shown that these measures relate well to eventual survival. However, observer subjectivity in fish vitality scoring can affect the precision and accuracy of inferences drawn from an analysis of the observations. Here we propose the use of a mixed-effects multinomial proportional-odds model, which is appropriate for modelling ordinal vitality data and is a useful approach for addressing observer scoring subjectivity. This model was used to analyse data collected for eleven fish taxa captured by four gear types. The effect of eight factors previously shown to affect discard survival was evaluated. The gear type used and amount of time that fish spent on deck prior to discarding most strongly and consistently affected the distribution of fish among vitality levels. Sea surface and air temperatures, and fish body size, were also important factors for a number of taxa, while other factors such as the depth fished, catch size and fishing activity duration were important only for certain taxa. A random effect in the model, used to account for observer subjectivity, was significant for most taxa and fisheries. Failure to account for this effect could affect both the precision and accuracy of inferences on the survival potential of discarded fish.©2010 Elsevier B.V.

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

MORISSETTE, L., M. CASTONGUAY, C. SAVENKOFF, D.P. SWAIN, D. CHABOT, H. BOURDAGES, M.O. HAMMILL, J. MARK HANSON, 2009. Contrasting changes between the northern and southern Gulf of St. Lawrence ecosystems associated with the collapse of groundfish stocks. Deep-Sea Res., Part II, Top. Stud. Oceanogr., 56(21-22): 2117-2131.

[Résumé disponible seulement en anglais]
In order to have a global view of ecosystem changes associated with the collapse of groundfish species in the Gulf of St.Lawrence during the early 1990s, Ecopath mass balance models were constructed in corporating uncertainty in the input data.These models covered two ecosystems (northern and southern Gulf of St.Lawrence; NAFO divisions 4RSand 4T), and two time periods (before the collapse, in the mid-1980s, and after it, in the mid 1990s). Our analyses revealed that the ecosystem structure shifted dramatically from one previously dominated by piscivorous groundfish and small-bodied forage species during the mid-1980s to one now dominated only by small-bodied pelagic species during the mid-1990s in both southern and northern Gulf.The species structure in the northern Gulf versus southern Gulf was different, which may explain why these two ecosystems did not recover the same way from the collapse in the early1990s. Productivity declined in the northern Gulf after the collapse but increased in the southern Gulf. The collapse of groundfish stocks resulted in declines in the mean trophic level of the landings in both the northern and the southern Gulf. Even though fishing mortality was then intentionally reduced, this part of the total mortality was taken up by predation.The temporal changes in the internal structure of both ecosystems are reflected in their overall emergent properties.©2009 Elsevier Ltd.

D'AMOURS, O., P. ARCHAMBAULT, C.W. MCKINDSEY, L. ROBICHAUD, 2008. The influence of bivalve aquaculture on ecosystem productivity. World Aquacult., 39(3) : 26-31.

D'AMOURS, O., P. ARCHAMBAULT, C.W. McKINDSEY, L.E. JOHNSON, 2008. Local enhancement of epibenthic macrofauna by aquaculture activities. Mar. Ecol. Prog. Ser., 371: 73-84.

[Résumé disponible seulement en anglais]
Bivalve aquaculture can influence coastal marine ecosystems by increasing organic material deposition, which, in turn, can have multiple direct and indirect effects on the surrounding benthic community. We assessed the influence of blue mussel Mytilus edulis aquaculture on the epibenthic macrofauna at 4 sites in Prince Edward Island, eastern Canada. The abundance of macroinvertebrates and benthic fishes (>2 cm) was evaluated by visual counts using SCUBA within 4 mussel aquaculture facilities (‘farms’) and at locations at distances of 50, 100, 500 and 2000 m outside of them in June, August and November 2005. Benthic assemblages were dominated by seastars Asterias sp. (79 %), rock crabs Cancer irroratus (8 %), mud crabs Neopanope sayi (6 %), moon snails Lunatia heros (2 %), winter flounders Pleuronectes americanus (2 %), American lobsters Homarus americanus (1 %) and hermit crabs Pagarus sp. (1 %). Although there was great variability among sites and sampling dates, mussel aquaculture had a clear effect on total abundance, which was generally greater within farms than at distances outside of them. These increases in abundance were mainly associated with increased numbers of seastars and rock crabs. Taxonomic richness and evenness differed among some mussel farms and distances outside of mussel farms, but there were no clear trends that suggested a negative influence of mussel aquaculture. Multivariate analyses indicated that communities within mussel farms differed from those at corresponding communities at distances outside of farms, but that the taxa that contributed to these differences varied among farms. Taxonomic assemblages for a specific farm and date were generally similar among distances outside of farms and increases in the abundance of epibenthic macrofauna appeared to be largely restricted to the immediate vicinity of mussel farms, i.e. <50 m. This increase in abundance probably reflected the attraction of mobile fauna due to increased food supply and possibly to the creation of a more heterogeneous habitat. These results suggest that large macroinvertebrates and benthic fishes, including ecologically and commercially important species, seem to respond positively to the presence of suspended mussel culture.©2008 Inter-Research

CLYNICK, B.G., C.W. McKINDSEY, P. ARCHAMBAULT, 2008. Distribution and productivity of fish and macroinvertebrates in mussel aquaculture sites in the Magdalen islands (Que´bec, Canada). Aquaculture, 283: 203-210.

[Résumé disponible seulement en anglais]
Aquaculture structures may function in a manner analogous to artificial reefs, in that they provide a complex three-dimensional habitat for marine organisms and/or modify the surrounding environment. Further, aquaculture structures may increase the productivity of fish and macroinvertebrates similarly to natural complex habitats, such as seagrass beds. This research tested the general hypothesis that suspended bivalve culture increases the abundance and productivity of fish and macroinvertebrates. The study was done at two mussel farms in the Magdalen Islands, eastern Canada. Fish and macroinvertebrates were sampled in different areas within farms sites and in adjacent natural vegetated and unvegetated habitats. The instantaneous growth rates of winter flounder (Pseudopleuronectes americanus), sand shrimp (Crangon septemspinosa) and the rock crab (Cancer irroratus) were estimated using physiological indicators (RNA/DNA ratios). The results demonstrated that mussel sites are not equivalent to natural structurally complex seagrass beds with respect to fish and macroinvertebrate assemblages. Several species were abundant in mussel farms, including winter flounder and rock crab. This work, however, provided little evidence to suggest that there was greater productivity of these fish and macroinvertebrates at mussel farms, as growth rates were usually equivalent in different habitats. This study, to our knowledge, is the first attempt to determine changes in productivity brought about by aquaculture. As future development of mussel aquaculture increases in many regions around the world, the methods presented here will provide baseline information on the abundance and productivity of fish and macroinvertebrates associated with aquaculture sites.©2008 Elsevier B.V.

PLANTE, S., C. AUDET, Y. LAMBERT, J. DE LA NOUE, 2005. Alternative methods for measuring energy content in winter flounder. N. Am. J. Fish. Manage., 25(1): 1-6.

[Résumé disponible seulement en anglais]
Indices of energy reserves may represent interesting parameters that can be used as bioindicators in environmental studies. The goal of this study was to identify a water-energy model that could predict energy reserves in winter flounder Pseudopleuronectes americanus. Winter flounder kept in captivity and fed different food types (either capelin Mallotus villosus or Atlantic herring Clupea harengus, amphipods Anonyx sarsi, and wet pellets) for 2, 5, and 14 months and wild fish captured in May, July, and October were used to show a large range in energy content. High levels of correlation were observed between water and energy contents in fish carcasses (r2 = 0.82) and muscle (r2 = 0.75). However, the biochemical composition of the liver remained relatively constant, despite changes in the hepatosomatic index. The condition factor (somatic weight/length3) was associated with energy reserves (i.e., water contents), but the coefficients of determination were smaller (0.18 < r2 < 0.34). We found that muscle water content, which can easily be determined, is an efficient way to accurately predict energy reserves in winter flounder.©2005 The American Fisheries Society

DE MONTGOLFIER, B., C. AUDET, Y. LAMBERT, 2005. Growth of early juvenile winter flounder (Pseudopleuronectes americanus Walbaum). Aquacult. Res., 36(16): 1595-1601.

PLANTE, S., C. AUDET, Y LAMBERT, J. DE LA NOUE, 2003. Comparison of stress responses in wild and captive winter flounder (Pseudopleuronectes americanus Walbaum) broodstock. Aquacult. Res., 34(10): 803-812.

De LAFONTAINE, Y., 1990. Distribution and abundance of ichthyoplankton in the Manicouagan River estuary, a tributary of the Lower St. Lawrence Estuary. Estuaries, 13: 43-50 .