대왕자바리의 대량생산을 위한 적정 염분을 구명하였다. 각 염분별 노출시킨 대왕자바리의 생 존율은 0 psu에서 노출 4일째 모두 폐사하였으며, 염분 5 psu 이상에서 생존율은 100%였다. 성 장률은 염분 5 psu 이상에서 염분 상승에 따라 체중과 체장은 모두 증가하였으며, 염분 30 psu (대조구)에서 성장률은 가장 높았다. 먹이섭취량은 염분이 하강함에 따라 감소하는 경향을 보 였다. 염분 3 psu에서 먹이섭취는 없었으며, 염분 20, 25 및 30 psu 간에 유의한 차이는 없었다. 염분별 혈액 삼투질농도는 염분 5~30 psu에서 341~368 mg Osmol/㎏였다. 염분변화에 따른 산소소비율은 30 psu(대조구)에서 163.6±22.3 mg O2/㎏ fish/h으로 유의하게 높았다. 염분변화 에 따른 SOD, CAT 및 GSH-PX는 염분 15 psu에서 가장 높았다. 따라서 대왕자바리 생존 최저 임계염분은 5 psu이며, 양성을 위한 적정 염분은 20~30 psu으로 추정된다.

The profer salinity range for aquaculture of hybrid grouper (Epinephleus bruneus♀ × Epinephleus lanceolatus♂) were evaluated in terms of their survival, growth, feed intake and physiological responses after 30 days of exposure to different salinities (0 psu, 3 psu, 5 psu, 10 psu, 15 psu, 20 psu, 25 psu, 30 psu). Hybrid grouper all died at 0 psu salinity on the 4th day of exposure but all hybrid survived at a salinity of 5 psu or higher during the exposure period. Body length and weight increased above 5 psu salinity and the growth rate was the highest at 30 psu. Hybrid exposed to 3 psu did not eat the feed pellet. Feed intake did not show a significant difference between salinity 20 psu, 25 psu and 30 psu. Plasma osmolality of the juvenile hybrids exposed to different salinities was 341~368 mg Osmol/kg above 5 psu. The oxygen consumption rate was the highest at 30 psu with 163.6±22.3 mg O2/㎏ fish/h. SOD, CAT and GSH-PX were significantly higher at 15 psu. Therefore, the critical salinity for survive of the juvenile hybrid was 5 psu, and the proper salinity for optimal culture was analyzed with 20∼30 psu.

서 론
재료 및 방법
결 과
    1. 염분변화에 따른 생존, 성장 및 먹이섭취 반응
    2. 염분변화에 따른 생리학적 반응
고 찰

• 신윤경(국립수산과학원 남해수산연구소 양식산업과) | Yun Kyung Shin (Aquaculture Industry Research Division, South Sea Fisheries Research Institute, National Institute of Fisheries Science, Yeosu 59780, Korea) Corresponding author
• 최영재(중앙내수면연구소) | Young Jae Choi (Inland Fisheries Research Institute, National Institute of Fisheries Science, Geumsan 32762, Korea)
• 길현우(국립수산과학원 남해수산연구소 양식산업과) | Hyun Woo Gil (Aquaculture Industry Research Division, South Sea Fisheries Research Institute, National Institute of Fisheries Science, Yeosu 59780, Korea)
• 김효원(국립수산과학원 남해수산연구소 양식산업과) | Hyo Won Kim (Aquaculture Industry Research Division, South Sea Fisheries Research Institute, National Institute of Fisheries Science, Yeosu 59780, Korea)