한국수산과학회

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kfas, vol. 54, no. 6, pp.974-981, December, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0974

Estimation of Genetic Parameters and Improvements for Growth Traits
of Selected Olive Flounder Paralichthys olivaceus
선발육종 넙치(Paralichthys olivaceus)의 성장형질에 대한 유전모수 및
유전적 개량효과 추정

박종원*·이다인·정효선·김주란·양혜림·이정호
국립수산과학원 어류육종연구센터

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-monthsold
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-monthsold
will be advantageous. Olive flounder is a major aquaculture species in Korea, and continuous selective breeding
research is essential to improve productivity.

Keyword : Genetic parameter, Heritability, Growth traits, Selection, Olive flounder

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