한국수산과학회

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kfas, vol. 54, no. 4, pp.426-433, August, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0426

Survival, Growth and Physiological Response of the Juvenile Hybrid Grouper (Epinephleus akaara♀×E. lanceolatus♂) Exposed to Different Water Salinity Levels 대왕붉바리 치어(Epinephleus akaara♀×E. lanceolatus♂)의 생존, 성장 및 생리학적 반응에 미치는 염분의 영향

신윤경*·최영재·길현우
국립수산과학원 남해수산연구소

This study aimed to determine the appropriate salinity condition for optimal cultivation of the juvenile hybrid grouper Epinephleus akaara♀×E. lanceolatus♂ in conditions of decreasing salinity. The survival, growth, metabolic rate, stress, and histological response were investigated in juvenile hybrid grouper exposed to different salinities for 30 days. At 0 psu, the survival rate of the juvenile hybrid grouper was 60% on the 2nd day of exposure and all individuals died on the 3rd day of exposure. At salinities above 3 psu, all animals survived throughout the exposure period. Growth rate for body weight of the juvenile hybrid grouper was the highest in the control and the lowest at 10 psu. Plasma osmolality of the juvenile hybrid grouper exposed to different salinities was 313-355 mg Osmol/kg at salinities above 10 psu, and then decreased to 225-264 mg Osmol/kg at salinities below 5 psu. The oxygen consumption rate tended to decrease as the salinity decreased. Stress responses of the juvenile hybrid grouper were analyzed with decreasing salinity. Therefore, it is considered that a salinity of more than 20 psu is suitable for the culture of the juvenile hybrid grouper.


Keyword : Hybrid grouper, Salinity, Survival, Growth, Stress response

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