Development of seawater adaptation in pink salmon,Oncorhynchus gorbuscha,during downstream migration: relationships to temperature and residual yolk |
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| Authors: | Vladimir S Varnavsky Nataly M Kinas Svetlana A Rostomova |
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| Institution: | (1) Laboratory of Ecological Physiology, Institute of Marine Biology, Far-East Branch of Academy of Sciences, Petropavlovsk-Kamchatsky, 683000, Russia;(2) Pacific Research Institute of Fishes and Oceanography, Kamchatka Branch, Petropavlovsk-Kamchatsky, 683000, Russia |
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| Abstract: | Synopsis Seawater adaptability of wild pink salmon, Oncorhynchus gorbuscha, alevins was investigated using 96 h LC50 test, muscle sodium level and weight loss tests. Five temperature (2, 6, 9, 13 and 16°C) and two yolk groups were analysed during the beginning, the middle and the end of downstream migration. Both temperature and amount of residual yolk affected seawater adaptability. The computation of muscle sodium levels and weight loss after a short term (3–12 h) seawater challenge test may be a convenient method to estimate the seawater adaptability of fish too small to allow analysis of blood sodium concentration. |
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| Keywords: | Seawater adaptability Muscle sodium level Challenge test 96 h LC50 test Weight loss Pisces Salmonidae |
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