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Energy expenditure during hatching in rainbow trout (Oncorhynchus mykiss) embryos

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The objective of our study was to estimate the overall (aerobic and anaerobic) energy expenditure involved in hatching in rainbow trout (Oncorhynchus mykiss) embryos. During hatching, there were significant increases (50% and 19%, respectively) in movement and oxygen consumption. There were no differences in tissue indicators of anaerobic metabolism (adenosine triphosphate (ATP), adenosine monophosphate (AMP) deaminase, ammonia) between embryos that hatched naturally (chorionated) compared with embryos in which the chorion had been manually removed and therefore did not hatch (dechorionated). Furthermore, phosphocreatine (PCr), ATP, and lactate were unaltered immediately after hatching compared with embryos at rest before hatch. The anaerobic capacity of just hatched larvae was further evaluated by forced exercise and hypoxic exposure. PCr and ATP were unaltered following a 2 min manual chase, whereas lactate concentration was significantly increased (30%). Hypoxia (5 mg O2·L–1, 5 days) resulted in a 2.7-fold elevation of tissue lactate concentration. Our results reveal that the increase in activity during hatch may be involved in escaping the egg capsule, but the metabolic cost of this increased movement is relatively small. Moreover, the anaerobic capacity of newly hatched rainbow trout is low relative to juvenile or adult fish.

L'objectif de notre étude est d'estimer la dépense globale (aérobie et anaérobie) d'énergie impliquée dans l'éclosion des embryons de la truite arc-en-ciel (Oncorhynchus mykiss). Durant l'éclosion, il y a des augmentations significatives de 50 % du mouvement et de 19 % de la consommation d'oxygène. Il n'y a pas de différence dans les indicateurs tissulaires de métabolisme anaérobie (triphosphate d'adénosine (ATP), monophosphate d'adénosine (AMP), déaminase, ammoniaque) entre les embryons (chorionés) qui éclosent naturellement et les embryons (déchorionés) dont le chorion a été retiré manuellement et qui n'éclosent donc pas. De plus, la phosphocréatine (PCr), l'ATP et le lactate demeurent inchangés immédiatement après l'éclosion par comparaison avec des embryons au repos avant l'éclosion. Nous avons aussi évalué la capacité anaérobie des larves fraîchement écloses à l'aide d'exercices imposés et d'une exposition à l'hypoxie. La PCr et l'ATP restent inchangées après une poursuite manuelle de 2 min, alors que la concentration de lactate s'accroît significativement de 30 %. Une hypoxie (5 mg O2·L–1, 5 jours) cause une augmentation de 2,7 fois de la concentration tissulaire de lactate. Nos résultats montrent que l'augmentation de l'activité durant l'éclosion permet peut-être la libération de la capsule de l'oeuf, mais que le coût métabolique de ces mouvements additionnels est relativement bas. De plus, la capacité anaérobie des truites arc-en-ciel à l'éclosion est basse par comparaison à celle des poissons juvéniles et adultes.

[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2006-06-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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