well as an osmotic distension of the egg envelopes. The perivitelline fluid and its containing multilamellar envelopes with their varied specialized patterns and filamentous elaborations provide a number of protective, nutritive, flotative, polyspermy preventive and regulative functions. Fish eggs and embryos, by monitoring the immediate environment, possibly may modify the colloidal composition of the perivitelline fluid and the substructural organization of the egg envelopes in some instances, thus providing an adaptive mechanism for survival in a polluted environment. The review includes a discussion of the problematic issues surrounding membrane origin, structure and nomenclature, suggestions for further research and an extensive bibliography.
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Hans W. Laale (1980) studied this question.