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配制不同浓度的Mg2+、Ca2+溶液培育幼蟹,研究Mg2+、Ca2+对大眼幼体育成Ⅲ期仔蟹成活率的影响。结果表明,养殖用水中的Ca2+、Mg2+含量及Mg2+/Ca2+(R)必须达到一定范围,才能使中华绒螯蟹的生长较快,成活率较高。其中Mg2+含量在300~500 mg/L,Ca2+含量在100~200 mg/L,R=3时,中华绒螯蟹大眼幼体育成Ⅲ期仔蟹的成活率为28%~48%,Ⅲ期仔蟹的体重平均达到54.88 mg。
Preparation of different concentrations of Mg2 +, Ca2 + solution of cultured crabs, study Mg2, Ca2 + on the survival rate of large-eyed juvenile crab breeding crab. The results showed that Ca2 +, Mg2 + and Mg2 + / Ca2 + (R) in aquaculture water must reach a certain range to make Eriocheir sinensis grow faster and have higher survival rate. The survival rate of crab Echinochloa crusgalli Ⅲ was 28% -48% with Mg2 + content of 300-500 mg / L, Ca2 + content of 100-200 mg / L and R = 3. The average weight of crabs reached 54.88 mg.