Abstract
ABSTRACT Exchanges of sodium ions between the egg of the salmon and the environment have been examined at different stages. In freshly stripped eggs and during the early stages of development exchange is confined to the chorion and perivitelline fluid. The perivitelline fluid can accumulate sodium to several times the ambient concentration probably by a Donnan effect associated with its protein content. At low external concentrations the relative accumulation is lower than the Donnan theory predicts. Sodium accumulation begins during the eyed stage and accelerates after hatching.
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