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The toxic effects of Zn2+ on Silver Carp (Hypophthalmichthyps molitrix C. et V.), Big Head Carp (Aristrichthys nobilis Richardson). Grass Carp (Ctenopharyngodon ilellus C. et V.), and Blunt Snout Bream (Megalobrama aimbly-cephala Yih) are studied. The test results are: (1) There are linear correlations between 24h LC50 and 48h LC50 of Zn + for Silver Carp fingerling and tempera -ture . 24h LC50, 48h LC50 and 96h LC50 of Zn2+ for fry of the four species are also determined; (2) There are logarithmic correlations between the growth rates of the fry and the concentrations of Zn2+ and between expansion of fish egg membranes after absorbing water and concentrations of Zn2 + ; (3) The tolerance of fry of the four species to Zn + is in the following order: Grass Carp>Silver Carp > Blunt Snout Bream>Big Head Carp; (4) The safe concentrations of Zn2+ are: Big Head Carp : 0.008 mg/ L, Grass Carp : 0.046 mg/ L , Blunt Snout Bream: 0,010 mg/ L , Silver Carp : 0.012 mg/ L , Silver Carp fingerling: 0.09 mg/ L .
The toxic effects of Zn2 + on Silver Carp (Hypophthalmichthyps molitrix C. et V.), Big Head Carp (Aristrichthys nobilis Richardson). Grass Carp (Ctenopharyngodon ilellus C. et V.), and Blunt Snout Bream (Megalobrama ambly- cephala Yih) are studied. (1) There are linear correlations between 24h LC50 and 48h LC50 of Zn + for Silver Carp fingerling and tempera -ture. 24h LC50, 48h LC50 and 96h LC50 of Zn2 + for fry of the four species are (2) There are logarithmic correlations between the growth rates of the fry and the concentrations of Zn2 + and between expansion of fish egg membranes after absorbing water and concentrations of Zn2 +; (3) The tolerance of fry of the four species to Zn + is in the following order: Grass Carp> Silver Carp> Blunt Snout Bream> Big Head Carp; (4) The safe concentrations of Zn2 + are: Big Head Carp: 0.008 mg / Snout Bream: 0,010 mg / L, Silver Carp: 0.012 mg / L, Silver Carp fingerling: 0.09 mg / L.