The relation between thickness of chorion and specific gravity of eggs from Norwegian and Baltic flatfish populations
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Neutral buoyancy, size, and thickness and ultrastructure of the chorion were studied in eggs from populations of flatfish (Platichthys flesus and Limanda limanda) from western Norway and three localities in the Baltic: Kiel, the Arkona basin and Tvärminne. The observed differences in neutral buoyancy are probably caused by the differing thickness of the chorion and are correlated with the salinity in the area. The differences are thought to be the result of a long term selection process.
SeriesFiskeridirektoratets skrifter, Serie Havundersøkelser
vol 16 no 3