Effect of fluoxymesterone on sex ratio and growth of Nile tilapia, Oreochromis niloticus (L.) |
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| Authors: | R P PHELPS W COLE T KATZ |
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| Affiliation: | Department of Fisheries and Allied Aquacultures and Alabama Agricultural Experiment Station, Auburn University, Alabama, USA;University of the Virgin Islands, Agricultural Experiment Station, Kingshill, St Croix, US Virgin Islands;308 Shiloh Springs Road, Dayton, Ohio, USA |
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| Abstract: | The androgenic and anabolic potential of fluoxymesterone (FM) was evaluated by incorporating the hormone into the feed of Nile tilapia, Oreochromis niloticus(L.) fry. Phenotypic all-male populations were produced when FM was given at 1, 5 and 25mg/kg of feed. Fry fed methyltestosterone (MT) at 60 mg/kg of feed and 0-2 mg of FM per kg of feed had a sex ratio of 97-7% and 87-3% phenotypic males. No positive anabolic effect was evident in response to adding FM or MT to the feed at the end of the 28-day treatment period or after an additional 6 weeks of growth without hormone. Growth was less for fry which received 25 mg/kg of FM compared to those receiving lesser rates of FM, 60 mg/kg MT, and controls. |
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