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蟹苗育成幼蟹,其成活率直接影响河蟹池塘养殖及人工放流的产量。湖泊蟹苗的放流回捕率通常只有2～3％,最高也只有5％。同样,用蟹苗直接在池塘养殖成河蟹的成活率也不高。主要原因是,蟹苗容易死亡和流失,长成幼蟹的比例小。故提高蟹苗培育的成活率,是增加产量,提高经济效益的关键。为此,我们利用网箱在池塘内进行蟹苗育成幼蟹(0.5克左右)的试验,观察蟹苗生长变态的生活习性,并定期测定浮游生物、水温等,从中找出影响蟹苗育成幼蟹的因素。
Crab nurture into crab, its survival rate directly affect the crab pond culture and artificial discharge of the yield. Lake crab seedlings release rate of return is usually only 2 to 3%, the highest only 5%. Similarly, the survival rate of crab breeding directly into ponds into crabs is not high. The main reason is that crab seedlings are easily killed and lost, and the proportion of crabs growing into crabs is small. Therefore, raising the survival rate of crab seedling cultivation is the key to increase production and increase economic efficiency. To this end, we use cages in the pond crab breeding crab (0.5 g or so) test to observe the growth habit of crab seedlings metamorphosis, and regular measurement of plankton, water temperature, find the impact of crab nursery growth Crab factors.