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ESTIMATION ON GENETIC PARAMETERS FOR LOW SALINITY TOLERANCE AND BODY WEIGHT OF PORTUNNUS TRITUBERCULATUS
Author(s): 
Pages: 1040-1045
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  Portunus trituberculatusbody weightlow-salinity tolerancegenetic parameters;
Abstract: We built up 20 full-sib families of Portunus trituberculatus to evaluate its genetic parameters of body weight and low-salinity tolerance. All the families were cultured under same conditions. After 60 and 90 days, body weight was measured and 90 individuals that randomly selected from each of the 20 families were placed under salinity 4, and mortality was counted in 12, 24, 48, and 72 h. The mortality was calculated to indicate the low-salinity tolerance. In addition, we conducted full-sibs variance component analysis to evaluate the genetic heritability of body weight. Results show that the heritability of body weight in 60-day-old animals was 0.45, and that of low-salinity tolerance in 12, 24, 48, and 72 h was 0.13, 0.18, 0.21, and 0.29, respectively. Moreover, we divided the low-salinity tolerance into 3 levels by K-means clustering. No significant correlation was found between the body weight and the low-salinity tolerance. Therefore, hybrid selective breeding technology was suggested for genetic improvement in production and tolerance traits in the future.
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