Abstract
The osmotic concentration of the perivitelline fluid in eggs of rainbow trout (Salmo gairdneri) was lower in eggs maintained in distilled water than in eggs maintained in dilute artificial sea water (11‰ and 13‰). The water content of eggs, larvae, and alevins in distilled water was significantly higher than in comparable developmental stages in dilute sea water. Similarly, differences were found in the tissue Na+, K+, and Na+:K+ ratios of eggs, larvae, and alevins reared in the different ambient salinities. These data suggest that the early developmental stages of rainbow trout possess a limited capacity for osmotic or ionic regulation. Larvae appear to regulate tissue Na+ content by increasing the Na+ concentration of the perivitelline space and alevins tolerate an increase in tissue K+ content and a small decrease in tissue water content.
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