Performance evaluation of XY all-male hybrids derived from XX female Channa argus and YY super-males Channa maculate

文献类型： 外文期刊

第一作者： Ou, Mi

作者： Ou, Mi;Chen, Kun-Ci;Luo, Qing;Liu, Hai-Yang;Liang, Xin-Qiu;Zhao, Jian;Wang, Ya-Ping;Chen, Bai-Xiang

作者机构：

关键词： All-male NBS; Sex control; Growth; Size uniformity; Feed conversion ratio

期刊名称：AQUACULTURE REPORTS （ 影响因子：3.216； 五年影响因子：3.812 ）

ISSN： 2352-5134

年卷期： 2021 年 20 卷

页码：

收录情况： SCI

摘要： Snakeheads are economically important freshwater fish in China, of which males grow much faster than females, and the individual size determines the trading price. All-male NBS (northern snakehead (Channa argus, NS) female x blotched snakehead (Channa maculata, BS) male) were produced by combining sex control, sex-specific molecular marker and hybridization of YY super-male BS and normal XX female NS. In this study, the culture performance of all-male NBS was evaluated, including yield, survival rate, growth rate, sex ratio, size uniformity, feed conversion ratio, and low-temperature resistance. The results showed that all-male NBS exhibited superior productivity traits compared to the existing cultured snakehead varieties. The average body weight of all-male NBS was heavier than that of mixed-sex NBS by 23.1-38.8 %, or inbred NS by 16.8-34.0 %; the average daily gains of all-male NBS were faster than those of mixed-sex NBS by 28.4-39.3 %, or inbred NS by 18.6-34.1 %. The male ratio of all-male NBS was more than 93.0 %, and there was a small proportion of female or bisexual individuals. The rates of body weight above 1 kg of all-male NBS were 91.3-96.4 %, which were far higher than those of mixed-sex NBS or inbred NS, which were only 62.0-75.8 %. Therefore, all-male NBS individuals are larger and more uniform. The feed conversion ratios of all-male NBS decreased 12.5-17.6 % compared to mixed-sex NBS fed artificial compound feed and 72.3 % compared to inbred NS fed iced fresh fish. In addition, the low-temperature resistance of all-male NBS was high, with only 4.1 % mortality vs. 28.5-37.4 % in other hybrids. In snakeheads trading, large individuals are more favored, and the price of snakeheads above 1 kg is approximately 40 % higher than that of individuals in the range of 0.5-2 kg. Therefore, the large and uniform all-male NBS population could bring tremendous economic benefits, because input costs are falling, while output profits are increasing. The large and uniform all-male NBS population is thus quite promising in snakeheads market applications.

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