Production of a high percentage of male offspring with a natural androgen, 11 bêta-hydroxyandrostenedione (11 bêtaOHA4), in Floride red tilapia
This paper reports the effects of a natural androgen, 11 [bêta]-hydroxyandrostenedione (11 [bêta]OHA4), on sex-reversed fry of the Florida red tilapia. In a first approach, the optimal dosage and duration were determined in the laboratory. The sex-reversal treatment was applied on post-yolksac stage fry (10 days after fertilisation at 27°C). Dosages of 20, 3 0, 40 and 50 mg of 11 [bêta]OHA4 kg-1 of food were used during periods ranging from 10 to 35 days. Dosages of 40 or 50 mg of 11 [bêta]OHA4 kg-1 of food during 21-35 days significantly increased the male percentage in sex-reversed groups in comparison to control groups. A lower but still significant deviation of the male percentage was observed when a dosage of 40 mg kg-1 was given during at least 28 days. Lower dosages did not significantly affect the sex ratio of treated groups. Based on the results of these observations, a follow-up study was conducted to evaluate the efficiency of this natural androgen for an intensive production of sex-reversed fry. Optimal dosage (50 mg kg-1) and treatment duration (28 days) were applied to increasing stocking density of fry (8000 11,000 fish m-2), producing a mean male percentage of 99.1% on the 510,000 treated fry. This study demonstrates the masculinizing efficiency of 11 [bêta]OHA4 in Florida red tilapia. Interest of a natural androgen, used in sex-reversal treatment, is discussed, particularly for the Florida red tilapia strain.
| Main Authors: | , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | M12 - Production de l'aquaculture, Tilapia, hormone, sexe, androgène, Oreochromis macrochir, http://aims.fao.org/aos/agrovoc/c_32720, http://aims.fao.org/aos/agrovoc/c_3663, http://aims.fao.org/aos/agrovoc/c_7010, http://aims.fao.org/aos/agrovoc/c_407, http://aims.fao.org/aos/agrovoc/c_43537, |
| Online Access: | http://agritrop.cirad.fr/512542/ http://agritrop.cirad.fr/512542/1/512542.pdf |
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