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Development of hypoosmoregulatory ability in allis shad Alosa alosa

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When different ages of juvenile allis shad Alosa alosa (18–74 days post-fertilization) were exposed for 48 h to elevated salinity (25 or 30), all ages could tolerate moderates salinity (25) whereas only the older stages could tolerate the higher salinity. In 88 days post-fertilization allis shad, acclimatation to full-strength sea water for 2 weeks did not lead to significant changes in total water content and gill Na+/K+-ATPase activity whereas total Na+ content increased within 5 days to values which remained stable thereafter. Together, these data suggest that juvenile allis shad develop a limited euryhalinity, which allows them to fully adapt to hyperosmotic environment immediately after transfer.

Keywords: Alosa alosa; allis shad; osmoregulation; salinity

Document Type: Research Article


Affiliations: 1: UMR INRA/Agrocampus Ecobiologie et Qualité des Hydrosystèmes Continentaux, CS 84215, 65 rue de St Brieuc, 35042 Rennes Cedex, France 2: INRA SCRIBE, IFR140, campus de Beaulieu, 35042 Rennes Cedex, France 3: INRA/U3E, 65 rue de St Brieuc, 35042 Rennes Cedex, France

Publication date: February 1, 2007

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