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(二)人工授精1、观察亲鱼的活动情况:产卵前约1个月,可见有些雄鱼相互打架,有的雌鱼进行追逐,食量大减。2、成熟度的鉴别:完全成熟的雌鱼,腹部膨大柔软,生殖孔红肿外突,当尾柄上提时,两侧卵巢下垂轮廓明显,轻挤卵粒外流。对已成熟的雌鱼要及时采卵,越早采卵,发眼率越高。所以,对亲鱼要多次进行成熟度的鉴别,间隔时间以10天以内为好(最好7—8天),以免卵子过熟。3、采精:对雄鱼可用挤压法采精,把精液直接挤在卵上,或把精先采出暂时贮存。精子挤出后的生活时间与温度等有很大关系。精子在
(B) artificial insemination 1, observe the activities of broodstock: about 1 month before spawning, we can see that some males fight each other, and some females chase, food intake greatly reduced. 2, the maturity of the identification: fully mature female, abdominal enlargement and soft, reproductive pores inflated, when the caudal peduncle on both sides of the ovary drooping outline, slightly squeeze the efflux of eggs. The mature female should ovulate in time, the earlier the egg, the higher eye rate. Therefore, the maturity of the broodstock to be repeatedly identified more than 10 days interval is good (preferably 7-8 days), so as not to over-egg. 3, mining: the male available squeeze method of extraction, the semen squeeze directly on the egg, or the first mining of temporary storage. After sperm extrusion life and temperature have a great relationship. Sperm in