The Morphological Study of Wild and Farmed Olive Flounder (Paralichthys olivaceus): The Role of Indirect Selection within and between Populations

Abstract

This study was conducted to analyze the difference of body types within and between wild and farmed populations of olive flounder Paralichthys olivaceus using measured records of morphological traits. The results showed that surveyed traits and standard deviation were 1,355±742 g of body weight, 48.01±7.79 cm of total length, and 40.96±6.80 cm of body length. Also body height, body shape index and condition factor were 17.19±3.43 cm, 9.99±0.74 and 11.16±1.54, respectively. As result of least squares mean and standard error for each trait assumed in this study, those of farmed population showed significantly higher than those of wild population in all traits, exclusively in total length and body length (p<0.01). Particularly, the values of the body height and the body weight of the farmed population were higher than those of the wild population in the same total length. And the phenotypic correlation coefficients of the body weight, the total length, the body length and the body height showed strong positive correlation in all populations. These result suggested that morphological differences exist in farmed and wild flounder. Therefore, introduction of wild flounder is essential for the future production to improve the body type of farmed flounder, and parental fish should be chosen by considering selection of commercially important traits in the production process.

Changes in Body Growth and Growth-Related Genes under Different Photoperiods in Olive Flounder, Paralichthys olivaceus

“…The olive flounder ( Paralichthys olivaceus ) is a very commercially valuable fish species in the Korean aquaculture industry. Many studies are being conducted to improve the efficiency of olive flounder breeding and rearing (Cho et al, 2006; Park et al, 2012; Kim et al., 2015). The objective of the study is to explore the optimal photoperiod conditions for rearing olive flounder to understand their effect on the daily rhythms of growth-related genes (preprosomatostatin1, PSS1 and GH) and arylalkylamine N-acetyltransferase2 (AANAT2) mRNA.…”