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Osmoregulation and gene expression of Na+/K+ ATPase in families of Atlantic salmon (Salmo salar) smolts

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This study reports that families of Atlantic salmon (Salmo salar) smolts vary in their ability to osmo- and iono-regulate following abrupt transfer to cold seawater. Eleven families of Atlantic salmon 0+ smolts were held in fresh water (2.4–4 °C) or transferred to seawater (1.9–4 °C) and sampled 0 h, 24 h, 96 h, and 30 days post-transfer. Plasma osmolality was significantly different among the families after 24 h of seawater exposure. The family with the lowest osmolality at 24 h also displayed the lowest plasma Cl concentrations as well as the highest gill Na+/K+ ATPase activity. Gill mRNA expression of the Na+/K+ ATPase α1b isoform increased following seawater exposure, whereas the α1a isoform decreased, but there was no significant difference among families. Taken together, the interfamily differences in osmoregulatory ability are correlated with gill Na+/K+ ATPase activity but not the expression of two salinity-sensitive Na+/K+ ATPase isoforms. Furthermore, the data indicate that family differences in gill Na+/K+ ATPase activity were only apparent when assayed at the sampling temperature (4 °C) and not at a higher assay temperature (10 °C).

Notre étude révèle que des familles de saumoneaux du saumon atlantique (Salmo salar) diffèrent dans leur habileté à faire de l'osmorégulation et de l'ionorégulation lorsqu'on les transfert abruptement en eau de mer froide. Nous avons gardé 11 familles de saumons atlantiques d'âge 0+ en eau douce (2,4–4 °C), les avons transférées en eau de mer (1,9–4 °C) et les avons échantillonnées 0 h, 24 h, 96 h et 30 jours après le transfert. L'osmolalité du plasma diffère considérablement d'une famille à l'autre après 24 h d'exposition à l'eau de mer. La famille avec l'osmolalité la plus basse après 24 h possède aussi les concentrations les plus faibles de Cl, ainsi que l'activité la plus forte de la Na+/K+ ATPase des branchies. L'expression dans l'ARNm des branchies de l'isoforme α1b de la Na+/K+ ATPase augmente après l'exposition à l'eau de mer, alors que celle de l'isoforme α1a diminue, sans qu'il y ait de différence entre les familles. Dans leur ensemble, les différences de potentiel d'osmorégulation entre les familles est en corrélation avec l'activité de la Na+/K+ ATPase des branchies, mais non avec l'expression des deux isoformes de la Na+/K+ ATPase sensibles à la salinité. De plus, nos données indiquent que les différences familiales de l'activité de la Na+/K+ ATPase des branchies ne sont apparentes qu'à la température d'échantillonnage (4 °C), mais non à une température supérieure d'analyse (10 °C).[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2005

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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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