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日本北海道茅部郡砂原町的前川一夫于1988年春季利用30尾雌性亲鱼(尼罗罗非鱼150—300g)和5尾雄性亲鱼(奥利亚500—1000g),生产了30万尾单性(全雄性)种苗。其生产方法概要介绍如下。从1月份开始将亲鱼(雌)置于18℃左右的低温状态饲育3个月。饲育用水槽系设置在钢筋结构的温室内,面积为10m~2的水泥槽。饲育期间,利用增减注入水槽内的温泉水(30℃),使水温保持在18℃左右,每天分早、晚两次投喂膨化饲料。3个月低温饲育后,把亲鱼逐尾移至水温仍为18℃左
Maebawa, a native of Matsubara-machi, Mobeu-gun, Hokkaido, Japan, produced about 300,000 unicellular (300-150 g) monkeys in the spring of 1988 using 30 female broodstock (150-300 g Nile tilapia) and 5 male broiler All male) seedlings. The production method is summarized as follows. From January onwards broodstock (female) placed in the low temperature of about 18 ℃ for 3 months. Feeding troughs are located in the steel structure of the greenhouse, an area of 10m ~ 2 cement tank. Feeding period, the use of change into the sink into the hot spring water (30 ℃), so that the water temperature maintained at about 18 ℃, every morning and evening fed puffed feed twice. After three months of low temperature breeding, the broodstock tail-end moved to the water temperature is still 18 ℃ left