The effect of acute changes in temperature and light on the aerobic metabolism of embryos and yolk-sac larvae of turbot (Scophthalmus maximus)

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Abstract:

The effect of acute changes of temperature and light on the rates of oxygen consumption and ammonia excretion of developing embryos and yolk-sac larvae of turbot (Scophthalmus maximus) reared at 15 °C were studied. Short-term temperature adjustments of ±2 °C gave a mean Q10 of 2.6 for the rate of oxygen consumption. Neither the presence nor the absence of light significantly influenced this response to acute temperature changes, despite light causing a significantly higher rate of oxygen consumption in the yolk-sac larvae between 9 and 12 days after fertilisation. This elevated metabolic rate in the presence of light occurred after pigmentation of the eyes and was probably due to activity associated with food-searching behaviour of this visual feeder. Similarly, for most development, the presence or absence of light and acute temperature adjustments did not cause any significant shift in the relative fraction of amino acids catabolised at 15 °C. However, on day 10 after fertilisation when peak rates of oxygen consumption occurred in the yolk-sac larvae exposed to light, the significantly elevated apparent nitrogen quotients indicated that greater amounts of amino acids were utilised for catabolic substrate oxidation.

Nous avons examiné les effets de changements aigus de température et de lumière sur les taux de consommation d'oxygène et d'excrétion d'ammoniaque chez des embryons et des larves vésiculées de turbots (Scophthalmus maximus) au cours de leur développement à 15 °C. Les ajustements à court terme de température de ±2 °C suivent un Q10 moyen de 2,6 pour le taux de consommation d'oxygène. Ni la présence, ni l'absence de lumière n'influencent cette réaction aux changements aigus de température de façon significative; néanmoins, la lumière cause un accroissement significatif du taux de consommation d'oxygène chez les larves vésiculées entre les jours 9 et 12 après la fécondation. Ce taux métabolique accru en présence de lumière a lieu après la pigmentation des yeux et est sans doute causé par une activité reliée au comportement de quête de nourriture chez ce poisson qui se nourrit à vue. De même, durant presque tout le développement, ni la présence, ni l'absence de lumière, ni les variations aiguës de température ne causent de changement significatif dans la fraction relative des acides aminés catabolisés à 15 °C. Cependant, au jour 10 après la fécondation, lorsque les taux maximaux de consommation d'oxygène se produisent chez les larves vésiculées exposées à la lumière, l'accroissement significatif des quotients apparents d'azote indique que de plus grandes quantités d'acides aminés sont utilisées pour l'oxydation catabolique de substrats.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2003

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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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