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Sex hormone induction of sex reversal in the goldfish and evidence for male heterogamity

✍ Scribed by Yamamoto, Toki-O ;Kajishima, Takao

Publisher: John Wiley and Sons
Year: 1968
Tongue: English
Weight: 590 KB
Volume: 168
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401680209

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✦ Synopsis

Methyltestosterone and estrone were administered orally to fry of the goldfish, Carassius auratus, daily for two months; thereafter, they were raised on a normal diet. All but one of the methyltestosterone-treated fish developed into males, while all estrone-treated fish developed into females. Of seven methyltestosteronetreated males mated with normal females, six produced progeny i n a 1 P :1 d ratio and the remaining one produced only females. Of eleven estrone-treated females mated with normal males, seven produced progeny in a 1 0 :1 d ratio and four yielded offspring in a ratio of 1 0 : 3 c?. Induction of sex reversal in both directions by heterologous sex hormones was successfully accomplished. The sex ratios of the progeny of hormone-treated goldfish provide evidence that the male is heterogametic m y > .

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