Effects of Five Drugs on Hatchability of Fertilized Eggs in CAS Ⅲ Strain ofAllogynogenetic Silver Crucian Carp
CHEN Bin1, FAN Haiping1, XUE Lingzhan1, GUAN Bi2, CHANG Mengyang2, ZHONG Quanfu1, YE Xiaojun1, ZHANG Weini2
1.Freshwater Fisheries Research Institute of Fujian Province, Fuzhou 350002, China; 2.College of Animal Science, Fujian Agriculture and Forestry University, Fuzhou 350000, China
Abstract：Fertilized egg adhesion on 5 cm×10 cm mesh patch of CAS Ⅲ strain of allogynogenetic silver crucian carp Carassius auratus gibelio were incubated in a 5 L plastic bucket and exposed to five drugs Mei ting Ⅱ, Mei ling, Natamycin, oxadixyl mancozeb and potassium permanganate prepared by stock of 1000 mg/L by equal interval between logarithm at water temperature 21—23 ℃ and pH 6.2—6.5 by using a semi-static test method to explore for the inhibition of water mold Saprolegnia and hatchability in fertilized eggs by the medicines. The results showed that all of 5 medicines had some inhibitory effects on the water mold of the fertilized eggs, with larger inhibition rate in Mei ting Ⅱ than in Mei ling and larger inhibition rate in Mei ling than in Natamycin, oxadixyl mancozeb and potassium permanganate. The toxicity and side effects of oxadixyl mancozeb were found to be significantly decreased in hatchability, with precautions utilization, and optimal dose of 4.90—6.50 mg/L in Mei ting Ⅱ, 1.97—3.87 mg/L in Mei ling, 1.50 mg/L in Natamycin and 2.50 mg/L in potassium permanganate in immersion. These findings suggest that Mei ting Ⅱ, Mei ling, Natamycin and potassium permanganate be effective for controlling Saprolegnia of fertilized eggs in allogynogenetic silver crucian carp CAS Ⅲ during incubation.
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2020, Vol. 39 
