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Interacting effects of water temperature and swimming activity on body composition and mortality of fasted juvenile rainbow trout

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We assessed changes in proximate body composition, wet mass, and the occurrence of mortality among sedentary and actively swimming (15 cm/s) juvenile rainbow trout (Oncorhynchus mykiss) (120–142 mm total length) that were held at 4.0, 7.5, or 15.0 °C and fasted for 140 days. Warmer water temperatures and swimming activity accentuated declines in lipid mass, but they did not similarly affect lean mass and wet mass. Swimming fish conserved lean mass independent of water temperature. Because lean mass exceeded lipid mass, wet mass was not affected substantially by decreases in lipid mass. Consequently, wet mass did not accurately reflect the effects that water temperature and swimming activity had on mortality of fasted rainbow trout. Rather, lipid mass was more accurate in predicting death from starvation. Juvenile rainbow trout survived long periods without food, and fish that died of starvation appeared to have similar body composition. It appears that the ability of fish to endure periods without food depends on the degree to which lipid mass and lean mass can be utilized as energy sources.

Nous avons mesuré les changements dans la composition générale du corps, la masse humide et la fréquence de la mortalité chez de jeunes truites arc-en-ciel (Oncorhynchus mykiss) (120–142 mm de longueur totale) sédentaires et actives (nage de 15 cm/s), gardées à 4,0, 7,5 et 15,0 °C et soumises à un jeûne de 140 jour. La température accrue de l'eau et l'activité de nage accentuent le déclin de la masse lipidique, mais n'ont pas le même effet sur la masse maigre et la masse humide. Les poissons qui nagent conservent leur masse maigre, quelle que soit la température de l'eau. Comme la masse maigre est plus grande que la masse lipidique, la masse humide n'est pas affectée de façon significative par le déclin de la masse lipidique. En conséquence, la masse humide ne reflète pas de façon précise les effets de la température de l'eau et de l'activité de nage sur la mortalité de truites arc-en-ciel soumises au jeûne. C'est plutôt la masse lipidique qui prédit le plus exactement la mort par carence alimentaire. Les jeunes truites arc-en-ciel survivent longtemps sans nourriture et les poissons qui meurent de manque de nourriture paraissent tous posséder la même composition corporelle. Il semble que la capacité des poissons à survivre à des périodes sans alimentation dépende de la possibilité d'utilisation de la masse lipidique et de la masse maigre comme sources d'énergie.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2003

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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