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Effects of acclimation to brackish water on tolerance of salinity challenge by young-of-the-year Adriatic sturgeon (Acipenser naccarii)

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Abstract:

The effects of a 24-h salinity challenge in water at 28 g·L–1 on plasma osmotic and ion homeostasis, swimming performance, and exercise respirometry were compared in young-of-the-year Adriatic sturgeon (Acipenser naccarii) maintained in freshwater (FW) or acclimated to brackish water (BW) that was slightly hypertonic to sturgeon plasma at a salinity of 11 g·L–1. Salinity challenge caused a significant increase in plasma osmolality and Na+ and Cl concentrations in both groups, but this was significantly less severe in the group acclimated to the BW as compared with FW. Salinity challenge elicited a significant and profound decline in maximum sustainable swimming speed (Ucrit) in sturgeon from FW, whereas there was no significant effect on Ucrit in the sturgeon acclimated to BW. A negative linear relationship was revealed between plasma osmolality, Na+ or Cl concentrations, and Ucrit. These variables appeared to influence Ucrit by increasing costs for locomotion while reducing the sturgeon's capacity for oxygen uptake and muscular work. The results indicate that prior acclimation to mildly hypertonic BW promoted osmoregulatory adaptations that improved the ability of the sturgeon to perform exercise following further increases in water salinity.

Les effets d'une épreuve de salinité de 24 h dans une eau à salinité de 28 g·L–1 sur l'homéostasie osmotique et ionique du plasma, la performance de nage et la respirométrie à l'exercice ont été comparés chez des jeunes Esturgeons de l'Adriatique (Acipenser naccarii) de l'année gardés en eau douce (ED) ou acclimatés à une eau saumâtre (ES) de salinité de 11 g·L–1, légèrement hypertonique par rapport au plasma d'esturgeon. L'épreuve de salinité entraîne une augmentation significative de l'osmolalité du plasma et des concentrations de Na+ et de Cl dans les deux groupes, mais les augmentations sont significativement plus faibles dans le groupe acclimaté à l'ES que dans le groupe d'ED. L'épreuve de salinité produit un déclin important et significatif de la vitesse maximale de nage soutenue (Ucrit) chez les esturgeons en ED, mais reste sans effet significatif sur les poissons acclimatés à l'ES. Il existe une relation linéaire négative entre l'osmolalité du plasma, les concentrations de Na+ ou de Cl et Ucrit. Ces variables semblent influencer l'Ucrit en augmentant les coûts de locomotion tout en diminuant l'aptitude de l'esturgeon à l'absorption d'oxygène et au travail musculaire. Nos résultats démontrent qu'une acclimatation préalable à une ES légèrement hypertonique favorise des adaptations osmorégulatrices qui améliorent l'aptitude de l'esturgeon à faire de l'exercice à des salinités encore plus élevées.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-06-01

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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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