当年繁殖的河蟹大眼幼体,如用常规方法养殖,年终蟹的个体一般为25～50克,极少数可达75克,检查蟹的性腺,其中有40％已达到性成熟。这种蟹,如上市则嫌规格小,卖价不高;如留作种苗下年继续养殖,又嫌个体过大,成活率很低(性成熟的蟹,会很快停止生长而死亡),给养殖者造成较大的经济损失。这个问题,常常困扰着 The reproductive crabs and big eyes of larvae, such as using conventional methods of breeding, end of the year crab individuals are generally 25 to 50 grams, a very small number of up to 75 grams, check the gonads of crabs, of which 40% have reached sexual maturity. Such crabs, such as the market is suspected of small size, the selling price is not high; as a seedling to continue breeding next year, but also suspected that the individual is too large, low survival rate (sexually mature crab, will soon stop growing and die) , To the farmer caused greater economic losses. This problem is often troubling