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Heritability of body weight and resistance to ammonia in the Pacific white shrimp Litopenaeus vannamei juveniles

文献类型： 外文期刊

作者： Li Wenjia 1 ; Lu Xia 1 ; Luan Sheng 1 ; Luo Kun 1 ; Sui Juan 1 ; Kong Jie 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Utilizat Marine Fisheries Res, Qingdao 266071, Peoples R China

关键词： Litopenaeus vannamei; heritability; resistance to ammonia; body weight; genetic correlation

期刊名称：CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.068； 五年影响因子：0.983 ）

ISSN： 0254-4059

年卷期： 2016 年 34 卷 5 期

页码：

收录情况： SCI

摘要： Ammonia, toxic to aquaculture organisms, represents a potential problem in aquaculture systems, and the situation is exacerbated in closed and intensive shrimp farming operations, expecially for Litopenaeus vannamei. Assessing the potential for the genetic improvement of resistance to ammonia in L. vannamei requires knowledge of the genetic parameters of this trait. The heritability of resistance to ammonia was estimated using two descriptors in the present study: the survival time (ST) and the survival status at half lethal time (SS 50) for each individual under high ammonia challenge. The heritability of ST and SS 50 were low (0.154 4 +/- 0.044 6 and 0.147 5 +/- 0.040 0, respectively), but they were both significantly different from zero (P < 0.01). Moreover, these two estimates were basically the same and showed no significant differences from each other (P > 0.05), suggesting that ST and SS 50 could be used as suitable indicators for resistance to ammonia. There were also positive phenotypic and genetic correlation between resistance to ammonia and body weight, which means that resistance to ammonia can be enhanced by the improvement of husbandry practices that increase the body weight. The results from the present study suggest that the selection for higher body weight does not have any negative consequences for resistance to ammonia. In addition to quantitative genetics, tools from molecular genetics can be applied to selective breeding programs to improve the efficiency of selection for traits with low heritability.

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