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선발육종 넙치(Paralichthys olivaceus)의 성장형질에 대한 유전모수 및 유전적 개량효과 추정
박종원 ( Jong-won Park ),이다인 ( Da-in Lee ),정효선 ( Hyo Sun Jung ),김주란 ( Julan Kim ),양혜림 ( He-rim Yang ),이정호 ( Jeong-ho Lee ) 한국수산과학회 2021 한국수산과학회지 Vol.54 No.6
The aim of this study was to evaluate genetic parameters of growth traits for improving selective breeding in olive flounder Paralichthys olivaceus produced in April 2019. The total length and body weight at 11-, 18-, and 22-months-old were measured for 7,479, 2,831 and 1,904 individuals, respectively. Since 2004, we have been conducting a selective breeding program to improve growth traits in the olive flounder. Data were analyzed using the restricted maximum likelihood method using the multiple traits animal model. The effect of sex and production period showed significant differences in all traits (P<0.05). The heritability of all traits was 0.428-0.520, which is relatively high by measurement month. Therefore, it is considered that individual selection will be more advantageous than family selection. However, to maintain an appropriate degree of inbreeding and genetic diversity for future generations, it is necessary to consider family selection adequately. Results of the correlation analysis between the same traits according to the measurement period indicated that considering production costs such as feed cost, selection at 18-months-old will be advantageous. Olive flounder is a major aquaculture species in Korea, and continuous selective breeding research is essential to improve productivity.