Genetic Parameters Estimation for Main Growth Traits of Snakehead Channa argus
HE Fei1, ZHANG Kang1,2, ZHU Shuren1, ZHANG Zhishan1, ZHANG Longgang1, AN Li1, DONG Xuesa1, LIU Hongcai1, MU Changjun3, ZHU Yong′an1, MENG Qinglei1
1. Shandong Freshwater Fisheries Research Institute, Jinan 250013, China; 2. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China; 3. Fisheries Development Service Center of Weishan County, Jining 277600, China
Abstract：To estimate the genetic parameters of the main growth traits in snakehead Channa argus, 32 mature male with body weight of males >1500 g, and female with body weight >1000 g were selected from the 2-year-old broodstocks kept by the research group, respectively, and were paired at a male-to-female ratio of 1∶1 to natural spawning and hatching, with a total of 26 full-sib families successfully established. Each family was cultured in net cages with the same size in the same pond from the 15th day after hatching to 6-month-old, and then PIT electronic tags were injected, and evenly stocked into 2 ponds for mixed culture. At 24-month-old, body weight was measured and phenotypic traits were assessed, and the heritability of the body weight of 6-month-old snakeheads was estimated using an individual animal model. The heritability, genetic correlation, and phenotypic correlation of the total length, body width, and body weight were also estimated in 24-month-old snakeheads. The results showed that the maximal coefficient of variation of body weight was observed, with 23.90% of coefficients of variation of body weight at 6 months and 43.27% at 24 months, without significant different in the heritability of body weight in 6-month-old snakeheads (P＞0.05), the 0.13±0.04 of heritabilities in total length, 0.22±0.06 in body width, and 0.22±0.06 in body weight in 24-month-old snakehead (P＜0.01). The genetic and phenotypic correlations between any two traits were shown to be highly positive, particularly, all greater than 0.99 in the genetic correlations(P＜0.05). The 24-month-old snakehead had the maximal genetic coefficient of variation (13.22%) in body weight. The maximum relative genetic progress (14.01%) was observed in 24-month-old snakehead using body eight as the selection index at selection rate of 10%, without significant difference in heritability of body weight in 6-month-old snakehead, probably due to environmental differences during the individual rearing period before mixed-family rearing. In the early stage of farming, environmental regulation was the main approach to promote uniform growth. The heritabilities of total length, body width, and body weight in 24-month-old snakehead were ranged from low to moderate. Considering the genetic progress and the high positive correlations among traits, body weight was the primary selection index in the breeding process of snakehead when the growth rate was the target trait. The findings provide fundamental data and technical support for the subsequent breeding of high-quality snakehead varieties.
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2026, Vol. 45 
