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Effects of gradual salinity increase on osmoregulation in Caspian roach Rutilus caspicus

Malakpour Kolbadinezhad, S. and Hajimoradloo, A. and Ghorbani, R. and Joshaghani, H. and Wilson, J.M. (2012) Effects of gradual salinity increase on osmoregulation in Caspian roach Rutilus caspicus. Journal of Fish Biology, 81 (1). pp. 125-134. ISSN 00221112 (ISSN)

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Abstract

This study was carried out to determine the effects of gradual salinity increase on osmoregulatory ability of the Caspian roach Rutilus caspicus, under conditions which mimic stocking conditions of hatchery-raised fish. Initially, 30 juvenile fish (mean ±s.d. 3·20 ± 0·34 g) were transferred to 20 l circular tanks, in which salinities were changed in a stepwise fashion, from 0 to 5, 10 or 15 at 48 h intervals. The fish at salinity 15 were held for an additional 48 h at this salinity. Forty-eight hours after salinity transfer, survival rate, haematocrit, plasma Cl -, Na + and K + concentrations, osmolality and gill Na +/K +-ATPase (NKA) activity were measured. The only effect of exposure to 5 was a significant reduction in haematocrit compared to the freshwater control group. Exposure to salinity 10 raised haematocrit, Cl - and Na + concentrations and osmolality. At 48 h exposure to salinity 15, haematocrit, Cl - and Na + concentrations and osmolality were significantly higher than freshwater controls, and gill NKA activity was significantly lower, but the effect on NKA was no longer evident at 96 h exposure. There were no effects on survival. These results indicate that R. caspicus juveniles experience an initial non-lethal iono-osmotic perturbation following salinity increase but can adapt to brackish water at salinity 15. © 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.

Item Type: Article
Additional Information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Fish Biol. [Field not mapped to EPrints] C2 - 22747808 [Field not mapped to EPrints] AD - Gorgan University of Agricultural Sciences and Natural Resources (GUASNR), College of Fisheries and Environment, Shahid Beheshti Ave, Gorgan 49138-15739, Iran [Field not mapped to EPrints] AD - Golestan Research Center of Gastroenterology and Hepatology (GRCGH), Golestan University of Medical Sciences, Shastcola Road, Gorgan 49341-74515, Iran [Field not mapped to EPrints] AD - Laboratório de Ecofisiologia, Centro Interdisciplinar de Investigaçao Marinha e Ambiental (CIIMAR), Rua dos Bragas 289, Porto 4050-123, Portugal [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled Keywords: Brackish water, Gill, Na +/K +-ATPase, NKA, Osmolality, adenosine triphosphatase (potassium sodium), fresh water, sea water, acclimatization, animal, aquaculture, article, Cypriniformes, electrolyte balance, hematocrit, metabolism, physiology, salinity, Acclimatization, Animals, Aquaculture, Cyprinidae, Fresh Water, Hematocrit, Salinity, Seawater, Sodium-Potassium-Exchanging ATPase, Water-Electrolyte Balance, Rutilus
Subjects: مقالات نمایه شده محققین دانشگاه در سایت ,Web of Science ,Scopus
موارد کلی
Divisions: معاونت تحقیقات و فناوری
Depositing User: GOUMS
Date Deposited: 18 Apr 2015 09:15
Last Modified: 12 May 2015 06:18
URI: http://eprints.goums.ac.ir/id/eprint/1991

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