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The effect of different concentrations of synthetic androgen 17?- methyl-testosterone (MT) on the adult fish,Colisa lalia was studied in the present investigation. It was found that fishes fed with homogenous mixture ofthe hormone in ethyl alcohol, exhibited phenotypically, morphometric, gonadal changes and differences in GSIvalue. Significant differences for length, weight, body color and GSI values were observed between hormonestreated and control groups. Fishes fed with hormonal doses of 10 and 15 mg/Kg feed showed significantlyelevated body color compared to 5 mg/Kg feed. Length, weight and GSI values were found significantly higherin 10 mg than 5mg/Kg and control group. The highest mean length and mean weight of fish was recorded as4.76±0.13 mm and 1.50±0.15g respectively with the hormone treatment of 10mg/Kg of feed. The present studyrevealed that the synthetic hormone had no significant effect on the gonad development of C. lalia.

Effect of Methyl Testosterone (17?-MT) on the phenotype, bioindices and<br>gonads of adult male dwarf Gourami (Colisa lalia)