Chromatin patterns in fishes with emphasis on sexual dimorphism

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Abstract
Twelve species of fish were investigated to determine whether sexual dimorphism occurs in the nuclei of their tissues as has been described for mammals. Feulgen-positive masses were present in nuclei of most tissues; some were similar in size, shape, and location to sex chromatin found in human buccal smears of the female. Although in Salmo gairdneri (rainbow trout) incidences of intranuclear chromatin masses in tissues of males were significantly higher than those of females, it was impossible to detect microscopically a nuclear sex difference in any of the species examined.

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