Abstract
Growth performance, survival and feed utilization of diploid (2n) and triploid (3n) sex-reversed male and female Nile tilapia were evaluated at maintenance feeding (1% body weight (BW) day 1 ), ¢xed feeding (3% BWday 1 ) and apparent satiation feeding levels in a freshwater recirculation system comprised of thirty-six 1-m 3 concrete tanks at the Asian Institute of Technology, Bangkok,Thailand. Triploid Nile tilapia (3n) was produced by subjecting fertilized diploid (2n) tilapia eggs to heat shock. After hatching, ¢sh were sex-reversed to all-male and allfemale populations by oral administration of 17 amethyltestosterone (60 mg kg 1 feed) and ethynylestradiol (100 mg kg 1 feed) respectively. There was signi¢cantly higher growth with increased ration levels in both male and female groups. There were no signi¢cant diierences in ¢nal BW, speci¢c growth rate, survival rate, feed conversion ratio and protein e⁄ciency ratio between diploid and triploid ¢sh. Triploids had lower gonad weights than diploids, and this was particularly evident at the satiation feeding level. Triploid ¢sh had a signi¢cantly higher apparent net protein utilization and percentage of gutted weight than diploids at all feeding levels. Higher protein utilization e⁄ciency of triploids might be an advantage for commercial tilapia culture but further research is necessary to make such a conclusion.
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