泰国渔业部门有关负责人称,为满足市场日益增长的需要,计划用改变鱼、虾类性别的方法来提高产量。通过注射甲基睾丸素,可将雌性淡水王虾和尼罗罗非鱼变成雄性。这样,这些鱼、虾就可快速生长并获得好价钱。同样,一种称作雌激素的激素可把一种普通雄性鲢鱼变成生长较快的雌鲢鱼,并在妊娠期得到较重的卵。 A responsible official from the Thai Fisheries Department said that to meet the growing needs of the market, it is planned to increase the output by changing the sex of fish and shrimps. By injecting methyltestosterone, female freshwater king shrimp and Nile tilapia can become male. In this way, these fish, shrimp can grow rapidly and get a good price. Similarly, a hormone called estrogen turns a common male silver carp into a faster-growing female silver carp and gains heavier eggs during pregnancy.