两种金属和两种农药对草鱼不同发育阶段的毒性效应

进行了金属和农药对草鱼不同发育阶段影响的试验。结果表明,对草鱼胚胎孵化率的影响,96h的EC_(50)值分别为:Cd~(2+)0.078mg/L;Cu~(2+)0.17mg/L;丙体六六六1.0mg/L;对硫磷1.0mg/L。畸形症状呈现出草鱼胚胎卵黄囊水肿,心脏发育受阻而形成管状心脏、胚体弯曲(弯体)等。草鱼的不同发育阶段对金属的敏感性存在着差异:Cd~(2+)96h的LC_(50)值,胚胎为0.1—0.5mg/L;10日龄草鱼苗为0.34mg/L;120日龄草鱼种为8mg/L.Cu~(2+)96h的LC_(50)值,胚胎为0.3—0.5mg/L;10日龄草鱼苗为0.11mg/L;120日龄草鱼种为0.59mg/L.

TOXICITIES OF TWO METALS AND TWO PESTICIDESTO GRASS CARPS AT DIFFERENTDEVELOPMENT STAGES

The effects of Cd, Cu,BHC and parathion on hatching rate of grass carp (Ctenopharyngodon idellus) were evaluated. The results indicated that the 96-hour EC50 were 0.078 mg/L for Cd, 0.17 mg/L for Cu, 1.0 mg/L for both BHC and parathion. The teratological symptoms appeared included kyphosis, yolk sac hydrops and tubular heart.The sensitivities of the fish at different development stages were also found to be different. The 96-hour LC50 were 0.1-0.5mg Cd/L and 0.3-0.5 mg Cu/L for embryo, 0.34 mg Cd/L and 0.11 mg Cu/L for 10 days fry and 8 mg Cd/L and 0.59 mg Cu/L for 120 days juvenile grass carp, respectively.