Cortisol Content and Na+/K+-ATPase Activity under Adaptation of Juvenile Pink Salmon Oncorhynchus gorbuscha (Salmonidae) to Salinity Changes
Autor: | E. I. Kaivarainen, Nina N. Nemova, N. L. Rendakov, Denis Efremov, K. M. Nikerova |
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Rok vydání: | 2021 |
Předmět: | |
Zdroj: | Journal of Ichthyology. 61:771-778 |
ISSN: | 1555-6425 0032-9452 |
Popis: | The experimental study yielded new data on changes in the activity of Na+/K+-ATPase and the level of cortisol in juvenile pink salmon Oncorhynchus gorbuscha that left the spawning nests (Olkhovka River, White Sea basin) during their transfer from fresh water to sea water (25‰) and back. The development of tolerance to increased salinity in juvenile pink salmon is accompanied by activation of Na+/K+-ATPase after 1 h and 24 h of maintaining in seawater and by cortisol content increase after 1 h of this exposure, followed by a return to the initial level after 24 h. The results obtained indicate the readiness of juvenile pink salmon to downstream migration into the marine environment immediately after leaving spawning nests. With the subsequent transfer of fish from salt water to freshwater after 24 h, the activity of Na+/K+-ATPase and the content of cortisol in them decrease, which may indicate the plasticity of the osmoregulatory reaction of pink salmon smolts. |
Databáze: | OpenAIRE |
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