人工蟹苗养成商品蟹技术的改进人工繁育的河蟹苗（大眼幼体），用常规方法养殖，当年个体一般可长到２５ｇ到５０ｇ，极少数可达７５ｇ。其中４０％的个体已达到成熟。这种蟹，如上市则嫌规格小，价格不高，如留作下年继续养殖，则因已达性成熟的个体成活率很低而造成较大... Artificial crabs to improve the technology of commercial crab Artificial breeding of crab (mackerel), using conventional methods of farming, when the individual can generally grow to 25g to 50g, a very small number of up to 75g. Forty percent of them have matured. Such crabs, such as the market is suspected of small size, the price is not high, if left to continue farming next year, then because of the sexual maturity has reached a very low survival rate caused by the larger ...