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Effect of Lanthanum on Egg Hatching of Ctenopharyngodon idellus

YANG Zai-fu ZHANG A-Iin ZHAO Ji (Department of Biology,Suzhou railway teachers college,Suzhou215009)  
Effect of lanthanum on egg hatching of Ctenopharyngodon idellus were studied.The ex-perimental results show that optimum concentrations of La3+are 0.6-4.8mg/L,The egg hatching rates are raised by 9.7%-19.4%.
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