在鱼苗生产中,随着亲鱼繁殖次数的增加,其生殖力会逐渐下降,因此,亲鱼需要逐年淘汰更新。冬季正是选留、选购亲鱼的最佳时节,选留时应注意以下几个方面: 1 时间 亲鱼最好在春节前(即大量捕捞成鱼时)选留。起捕成鱼时,水温以在6℃～12℃之间为好,这时鱼的摄食量减少,活动缓慢,鳞片 In the production of fry, the reproductive capacity of broodstock will gradually decrease as the number of broodstock breeding increases. Therefore, broodstock need to be eliminated annually. Winter is the best choice to stay, buy the broodstock the best season, the election should pay attention to the following aspects: 1 time broodstock is best before the Spring Festival (that is, large fish into the fish) to choose to stay. When catching fish, the water temperature should be between 6 ° C and 12 ° C, then the food intake of the fish will decrease, the activity will be slow, and scales