Comparison of Conditions for Hormonal Sex Reversal of Mozambique Tilapias
- 1 April 1994
- journal article
- Published by Oxford University Press (OUP) in The Progressive Fish-Culturist
- Vol. 56 (2) , 81-90
- https://doi.org/10.1577/1548-8640(1994)056<0081:cocfhs>2.3.co;2
Abstract
Roles of selected factors on sex reversal of fry of Mozambique tilapia (Tilapia mossambica) administered 17∝-methyltestosterone (MT) through the diet were investigated. The tested factors were temperature (22–38°C), photoperiod (darkness: light, 0 h:24 h to 24 h:0 h), stocking density (100–2,000 fry/m2), feeding rate (10 or 25% body weight!d), supplementation of the medium with a growth promotor (thyroxine), and storage conditions of MT and MT-treated feed. Survival, growth, and sex-reversing potency of MT were significantly influenced directly or indirectly by temperature, feeding rate, photoperiod, and storage conditions of both MT and MT-treated feed. Stocking density and supplementation of thyroxine in the rearing medium influenced survival and growth. without modifying the sex-reversing potency of MT, when the treated fry were fed ad libitum. Photoperiod and low rearing temperature did not directly alter MT-induced sex reversal but did affect sex reversal indirectly by inhibiting MT-treated ...Keywords
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