大多数鱼类的性腺仅在一年的某个特定的季节内成熟,在这些季节内,鱼类生活的环境条件必需与鱼类性腺发育所必需的条件相符合,其性腺才能发育成熟。由于每一个地区的环境条件都不一样,因而在不同的地区内,即令是同一品种的鱼类,其性腺成熟的具体时间也是不一致的。而在温度、光照、海流、盐度和食物等环境条件中,以温度 The gonads of most fish mature only in a given season of the year, and during these seasons, the environmental conditions in which the fish live must be compatible with the conditions necessary for the development of fish gonads so that the gonads can mature. Because of the different environmental conditions in each region, the exact time of gonadal maturation in different regions, even the same species of fish, is also inconsistent. In temperature, light, current, salinity and food and other environmental conditions, the temperature