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一、催产后的亲鱼已到效应时间而发情微弱。检查亲鱼时,从鱼体外形看,雌鱼腹部膨胀不大,不变软,挖卵观察:(1)卵粒不均匀,不游离,核仍在中央,这是不成熟的卵子,说明亲鱼没有成熟,应将亲鱼放回培育池强化培育,待到10—15天后再催产。(2)卵子已分离,呈球形,卵核清楚且偏位,但仍停留在催产时成熟状态,说明激素的作用不足,致使卵球成熟反应减慢或中途停顿。发生这类情况,主要是亲鱼不够成熟或是催产剂量不足,或是水温偏低等原因,应采取及时补针的方法。补针剂量与催产剂量相同。(3)卵子呈球形,但形态出现异
First, the pro-fish broodstock has been to effect the time and weak estrus. Check the broodstock, from the fish body shape, the female abdomen is not inflated, not soft, digging eggs observed: (1) non-uniform eggs, not free, the nucleus is still in the center, which is immature eggs, indicating broodstock Not mature, broodstock should be returned to the breeding pool to strengthen nurturing until 10-15 days after the oxytocin. (2) egg has been separated, spherical, egg clear and skewed, but still remain in the mature state of oxytocin, indicating the lack of role of hormones, resulting in a slow or stop midgut mature response. Occurrence of such situations, mainly the broodstock is not mature enough or oxytocin dose is insufficient, or the water temperature is low and other reasons, should take timely methods. Replacement dose and oxytocin dose the same. (3) egg is spherical, but the shape appears different