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- W2144639215 abstract "The incidence of sexual inversion in Phoxinus phoxinus has been studied by examining histologically (a) the gonads of 406 adult specimens caught from the wild during a period of 16 months, (b) the gonads of 168 adults kept in captivity in groups with an experimentally altered sex-ratio, and (c) the differentiation of the gonads in the fry. All the adults had either testes or ovaries and no case of intersexuality was observed. For both testis and ovary, we recognized two phases, depending on the seasonal cycle: an active spring-summer phase, corresponding with the period of reproduction, and a quiescent autumn-winter phase. The ovaries showed an asynchrony in oocyte development, which is typical of species that spawn many times during the breeding season. In P. phoxinus the ovaries are easily recognizable just one month after hatching and testes are well differentiated in 2-month-old fingerlings. Differentiation is, therefore, precocious and follows a pattern typical of gonochoristic species in which hermaphroditism never occurs." @default.
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- W2144639215 date "1987-01-01" @default.
- W2144639215 modified "2023-09-25" @default.
- W2144639215 title "The problem of sexual inversion in the minnow, Phoxinus phoxinus (L.)" @default.
- W2144639215 cites W2040265118 @default.
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- W2144639215 doi "https://doi.org/10.1111/j.1095-8649.1987.tb05731.x" @default.
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