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Induction of sex reversal in Oreochromis mossambicus by diethylstilbestrol
Author(s) -
Basavaraja N.,
Nandeesha M. C.,
Varghese T.J.,
Keshavanath P.,
Srikanth G. K.
Publication year - 1990
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1990.tb00500.x
Subject(s) - oreochromis mossambicus , biology , diethylstilbestrol , sex reversal , tilapia , endocrinology , medicine , fish <actinopterygii> , estrogen , sex ratio , zoology , fishery , biochemistry , population , demography , sociology , gene
Summary The efficacy of the synthetic estrogen, diethylstilbestrol (DES), for sex‐reversal in the Java tilapia, Oreochromis mossambicus was investigated. Fry of 8–10 mm total length were fed diets containing 25, 50 and 100 ppm of DES for 30 days in plastic pools; this was followed by 45–65 days rearing in fertilized cement cisterns where hormone‐free diet was given. DES at 50 and 100 ppm induced 100% sex‐reversal; DES at 25 ppm resulted in only a slightly larger proportion of females to males. The untreated control group had a higher proportion of males than females. No intersex or sterile individuals were observed among the steroid‐treated fish. The present investigation demonstrates that 50 ppm DES administered for 30 days is sufficient to induce a 100% sex‐reversal in O. mossambicus.