Sex determination system and monosex production in sunsetplaty (Xiphophorus variatus, Meek, 1904): Technical paper no. 21/1998
1998
Nuanmanee Pongthana | Siam Kungcharoenwattana | Puttharat Baoprasertkul | Mullika Niroth (Department of Fisheries, Bangkok (Thailand). National Aquaculture Genetics Research Inst.)
Studies on the sex determination mechanism in the Sunsetplaty (Xiphophorus variatus, Meek, 1904) indicated that females are homogametic XX and males are heterogametic XY. Experiments to produce all-male Sunsetplaty via hormonal sex reversal showed that the most effective method to produce all-male fish is by immersion treatment of 17 alpha methyltestosteron at the dosage of 50 micro g/l starting from 3 days post-hatched fry for the period of 30 days. Experiments to indirectly produce all-male Sunsetplaty were carried out by crossing YY males with normal XX females which resulted in the average male ratio of 95.37+-17.97 percent. The procedures to produce YY males were: 1) sex reversal to produce XX and XY females by immersion treatment of 17 Beta-estradiol at the dosage of 100 micro g/l starting from 3 days post-hatched fry for the period of 45 days, 2) progeny testing of sex reversed XX and XY females, 3) selecting XY females which produce 3:1 male:female ratio offspring as the broodstock, 4) producing offspring from crossing XY females with ordinary XY males, 5) progeny testing of XY and YY males, and 6) selecting YY males which produce all-male offspring as the broodstock for monosex production of Sunsetplaty.
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