SEX REVERSAL IN OSTREA VIRGINICA

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Abstract
By considering the sex ratios of Atlantic oysters of Canada and northern United States and by comparing these with the ages and average sizes of the oysters and with their degree of proximity to one another, the following conclusions are reached. The majority of oysters in any one population mature as males and later change to females. This change may be hastened by an environment favourable to growth or retarded by the proximity of older females. A marked oyster known to be male in 1930 was shown to be female in 1931. A few hermaphroditic oysters have been found. It was shown that self-fertilization in these is possible and it is believed that it may sometimes take place.

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