Ca^(2+)、Mg^(2+)对凡纳滨对虾存活及生长的影响

Effects of Ca^(2+) and Mg^(2+) on survival and growth of Penaeus vannamei

通过单因子静态急性毒性试验和正交设计法,研究水环境中Ca^(2+)、Mg^(2+)、Ca^(2+)+Mg^(2+)总量及Ca^(2+)/Mg^(2+)比值对凡纳滨对虾存活及生长的影响。结果表明:(1)凡纳滨对虾48h的Ca^(2+)的LC_50为407.38mg·L^(-1)、Mg^(2+)的LC_(50)为741.31mg·L^(-1)。(2)在Ca^(2+)/Mg^(2+)比值为1:10时,对凡纳滨对虾生存没有影响;(3)凡纳滨对虾的生长与Ca^(2+)浓度有密切关系,其值过高或过低均会影响凡纳滨对虾的生长;在Ca^(2+)/Mg^(2+)比值为1:3时,凡纳滨对虾生长和存活率随着Ca^(2+)+Mg^(2+)质量浓度的增加而上升,但达到一定质量浓度后,又随着Ca^(2+)+Mg^(2+)质量浓度的继续增加而下降。

Single-factor acute toxicity test and orthogonal design were used to study the effect of the concentrations of Ca^(2+) and Mg^(2+), Ca^(2+)+ Mg^(2+) and Ca^(2+)/Mg^(2+) on survival and growth of P. vannamei. The results show that (1) The LC_(50) of P. vannamei with Ca^(2+) is 407.38 mg' L^(-1) in 48 hour, while the LC_(50) with Mg^(2+) is 741.31 mg·L^(-1). (2) When Ca^(2+)/Mg^(2+) equals 1 : 10, the survival of shrimp is not affected. (3) The growth of P. vannamei has close relation with the concentration of Ca^(2+) , which would affect the growth of P. vannamei, whether it is high or low. When Ca^(2+)/Mg^(2+) equals 1:3, the growth and survival rate will rise with the qualitative increasing concentration of Ca^(2+)+ Mg^(2+). When it reaches a certain degree, those rates will descend with the increasing concentration.