Realized Heritability of F2 Hybrid Breeding Line of Bay Scallop Argopecten irradians concentricus
To evaluate the breeding effect of a fast-growing selective breeding line with black and white shell color between the wild population of Argopecten irradians concentricus and the orthocross offspring of the scallop"Bohai Red",the breeding line F1 was obtained using the breeding strategy of black and white shell color as the first choice and 5％of the maximum shell length as the second selection in the or-thocross generation,and then the"F2 selection line"was obtained using the same method."F2 non-selec-tion line"was used as a control to probe into the"F2 selection line"contemporary genetic gain and the real-ized heritability of various economic traits.The results showed that growth traits of the"F2 selection line"generation were significantly better than those of the"F2 non-Selected"generation(P＜0.05),even though without significant difference in the survival rate of the"F2 selection line"generation compared with that of the"F2 non-selected"generation.The contemporary genetic gains were shown to be 8.29％in shell length,6.65％in shell height,10.26％in shell width,20.72％in body weight,33.98％in adductor weight and 25.91％in soft tissue weight,with the coefficients of variation to be 7.01％in shell length,8.46％in shell height,8.50％in shell width,14.80％in body weight,26.32％in adductor weight and 15.98％in soft tissue weight,and from 0.41 to 0.47 for the realized heritability of each growth trait of the selected breeding lines,showing high heritability.Shell-length selection on the cross-selected generation F1 led to bring significant genetic progress,with the significant selection effect,and greater potential for con-tinued selection in the"F2 selection line".The findings provide basis for further selection of selective lines.
Argopecten irradians concentricusscallop"Bohai Red"hybrid breedinggenetic gaincoef-ficient of variationrealized heritability
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