Abstract:

The influence of duration (10-20 d) and concentration (250-1,000 mg• kg·1 diet) of diethylstilboestrol (DES) treatment on the production of phenotypically female populations of ge­notypically YY Oreochromis niloticus was evaluated. Sex ratio of all DES-treated populations deviated significantly (P<0.05) from the expected all maJe. Concentration of hormone was a sig­nificant factor in the production of phenotypic females, and the effective period for feminization treatment was 10·15 d following yolk•sac absorption. The critical factors influencing effective sex reversal treatment are discussed. 

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Date 1996/12/01

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