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Effect of four diets on reproductive performance of broodstock Onchidium struma

WU Xu-gan1,2,TANG Bo-ping2,TENG Wei-ming1,CHENG Yong-xu1,WANG Jin-feng1,ZHOU Bo1,HU Bing1,YANG Xiao-zhen1(1.Key Laboratory of Aquatic Genetic Resources and Aquaculture Ecosystem Certificated by the Ministry of Agriculture,Shanghai Fisheries University,Shanghai 200090,China;2.Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresource and Environmental Protection,Yancheng 224002,China)  
The study was conducted to investigate the effects of Spirulina meal(A),corn meal(B),wheat flour(C) and fermented pig manure(D) on feeding,survival,egg production and egg quality of broodstock Onchidium struma.The results indicated that,(1)there wasn't significant difference on survival rate among four groups with survival rate of more than 90% in all groups.The broodstock Onchidium struma seemed to like to eat wheat flour,while they eat less fermented pig manure than other diets.(2)The broodstock of group B and group C had more total egg production than group A and group D,and average egg production per individual of group A and group D was only 70% of those of group B and group C.The spawning peak of group A and group D occurred on August 26,while that of group B and group C occurred from August 28 to 30.(3)The embryo produced by group A developed quicker than those eggs produced by other groups.The hatching rate of group A was 73.97%,which was higher than that of other three groups(P0.05).The eggs produced by group C had higher hatching rate than those produced by group B and group D.The lowest hatching rate could be found in group D(7.71%),whose embryo developed asynchronously with long hatching period of 19-22 days.In conclusion,wheat flour and corn meal can improve the egg production of broodstock Onchidium struma,while the group fed Spirulina meal has higher hatching rate than other groups.
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