Evaluation of methyltestosterone induced sex reversal in Tilapia nilotica
1983
Carino, V.S. (University of the Philippines, Quezon City. Dept. of Zoology)
Methyltestosterone was orally administered to gonadally undifferentiated Tilapia nilotica at a dose of 50 mg/kg feed for 21, 32 and 42 day period. Sex ratios in andragen treated fish were significantly different (p=0.05) from the normal 1:1 ratio. All male population was observed in fish fed with the hormone diet for the 32 day period. The progeny of treated males bred with untreated females had a sex ratio of 3:2:1. There was no abnormality in gonad histostructive of hormone fed fish. Sexing through papilla examination showed effectivity of papilla inspection only for fry greater than 60 mm. A 17% error was observed in manual sexing of fry smaller than 60 mm.
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