Genotype by environment interaction for growth and survival rate in black tiger shrimp (Penaeus monodon) in generation 4
Genotype by environment interaction for growth rate in G1 of the same selection program has been published. However, there is no repeated figure in later generations for confirming and well-planning the design of selection program for further improvement. The experiment was conducted using selective population of generation 4 with 97 families tested in 3 environments. Growth (body weight) and survival rate at harvest weight were recorded and evaluated. There was no genotype by environment interaction for both traits with high genetic correlations of the same traits tested between ponds in the Central and in the South of Vietnam of 0.80 and 0.83, respectively. There was also no genotype by environment interaction for growth rate between ponds in the South of Vietnam and bio-security indoor tank with high genetic correlation of 0.91. These results indicated that the number of testing environments would be reduced to save the operation cost for a breeding program. Estimated genetic response was from moderate to high for growth trait corresponding to moderate to high heritabilities (0.20 - 0.45) and high for survival rate corresponding to high heritabilities (0.34 - 0.45).