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Auteur (up) Shirangi, S.A.; Kalbassi, M.R.; Khodabandeh, S.; Jafarian, H.; Lorin-Nebel, C.; Farcy, E.; Lignot, J.-H. url  doi
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  Titre Salinity effects on osmoregulation and gill morphology in juvenile Persian sturgeon (Acipenser persicus) Type Article scientifique
  Année 2016 Publication Revue Abrégée Fish Physiol Biochem  
  Volume 42 Numéro 6 Pages 1741-1754  
  Mots-Clés Chloride cell; Juvenile; K+-ATPase activity; Na+; Osmoregulation; Persian sturgeon; Salinity acclimation  
  Résumé The effect of abrupt and 5-day gradual salinity transfers from freshwater (FW) to 11 ‰ Caspian Sea brackish water (BW) was investigated in juvenile Persian sturgeon Acipenser persicus with three different weight groups: 1–2 g (1.62 ± 0.27 g), 2–3 g (2.55 ± 0.41 g) and 3–5 g (4.28 ± 0.76 g). Mortality rates, blood osmotic pressure, gill morphology and branchial Na+, K+-ATPase (NKA) activity were measured 4 and 10 days after abrupt transfer and 9 and 15 days after the initial gradual transfer (i.e. 4 and 10 days after reaching Caspian Sea salinity). Fish under 3 g could not survive increased salinity, and the blood osmotic pressure of the remaining surviving fish increased and remained elevated. However, heavier fish were able to survive and successfully acclimate, even to rapid salinity change with osmotic pressure reduced to Caspian Sea osmolality levels. At the gill level, the developmental increase in chloride cell volume and a higher NKA content most probably allow juveniles weighing more than 2 g to sharply increase NKA activity if the fish are transferred to BW. The rapid chloride cell proliferation occurring with increased salinity should strengthen this acclimation response. Therefore, a drastic physiological change occurs when fish weigh more than 2 g that allows migration to higher salinities. The triggering signal on chloride cells must be further investigated in order to optimize this functional step.  
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  Langue en Langue du Résumé Titre Original  
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  ISSN 1573-5168 ISBN Médium  
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  Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2410  
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