본 연구는 대서양연어 (Salmo salar) 파르를 대상으로 다른 광주기 (L24:D0, L15:D9, L12:D12, L9:D15, L0:D24)에 60일간 노출시킨 후에 생존, 성장 및 혈액성분에 관한 영향을 연구하였다. 실험종료 시 생존율의 측정결과 L24:D0 실험구는 90.0± 7.1%, L12:D12 실험구는 87.5±3.5%, L9:D15 실험구는 97.5±3.5%, L24:D0 실험구는 97.5±3.5%로 나타났으나 각 실험구 간의 유의한 차이는 없었다. 실험종료 시 각 실험구의 증체율 (weight gain, WG), 일간성장률 (specific growth rate, SGR) 및 사료효율 (feed efficiency, FE)의 변화를 측정한 결과, 광주기 차이에 따른 유의한 변화는 보이지 않았다. 혈장 성분 중 ALT (alanine aminotransferase), AST(Aspartate Aminotransferase) 및 glucose는 L24:D0 실험구가 다른 실험구에 비해 유의하게 상승한 것으로 나타났다. 혈장 cortisol은 L24:D0와 L0:D24가 가장 높았으며, L15:D9와 L9:D15와는 유의한 차이는 보이지 않았지만, L12:D12보다는 유의하게 높은 것으로 나타났다. 혈장 sodium (Na+), potassium (K+), chloride (Cl-) 및 osmolality는 각 실험구 간에 유의한 차이는 보이지 않았다. 본 연구결과, 대서양연어 파트에 대해서 60일간 다른 광주기에 노출 시켰을 때 생존 및 성장도의 변화는 보이지 않았으나, L24:D0 실험구에서 조직손상과 스트레스 지표인 혈장 ALT, AST, cortisol 및 glucose 농도가 유의하게 상승하는 것으로 나타났다.

cThis study was conducted to investigate the effects of the different photoperiods (24 hour Light & 0 hour Dark, L24:D0; 15 hour Light & 9 hour Dark, L15:D9; 12 hour Light & 12 hour Dark, L12:D12; 9 hour Light & 15 hour Dark, L9:D15; 0 hour Light & 24 hour Dark, L0:D24) on growth, survival and hematological parameters of Atlantic salmon (Salmo salar) parr for 60 days. The survival rate of L24:D0 were 90.0±0.0%, the L15:D9 were 90.0±7.1%, the L12:D12 were 87.5±3.5%, the L9:D15 were 97.5±3.5%, and the L24:D0 were 97.5±3.5%, and there was no significant difference between each experimental groups. Growth factors such as weight gain (WG), specific growth rate (SGR) and feed efficiency (FE) tended to be higher as the photoperiod increased, but there was no significant difference in the experimental groups. In the plasma components, the ALT (alanine aminotransferase), AST (Aspartate Aminotransferase) and glucose were found to have significantly increased in L24:D0 group compared to other experimental groups. The plasma cortisol was the highest in L24:D0 and L0:D24, although there was no significant difference between L15:D9 and L9:D15, it was significantly higher than L12:D12. No significant difference was found between plasma sodium (Na+), potassium (K+), chloride (Cl-) and osmolality in each experimental groups. As a result of this study, there was no significant change in survival and growth when exposed to different photoperiods on Atlantic salmon parr for 60 days, but the plasma ALT, AST, glucose and cortisol, indicating the liver damage and stress markers were significantly increased in the L24:D0.

서 론
재료 및 방법
    1. 실험어 및 실험시스템
    2. 조명장치 및 광주기 실험조건
    3. 수질분석 및 실험사료
    4. 성장도 측정
    5. 혈액 분석
    6. 통계분석
결과 및 고찰
사 사
참고문헌

• 이유진(충청북도내수면산업연구소) | Yu Jin Lee (Inland Fisheries Industrial Institute of ChungCheongBuk-Do, Chungju-si 27432, Republic of Korea)
• 장석우(충청북도내수면산업연구소) | Seok Woo Jang (Inland Fisheries Industrial Institute of ChungCheongBuk-Do, Chungju-si 27432, Republic of Korea)
• 고지예(충청북도내수면산업연구소) | Ji Ye Go (Inland Fisheries Industrial Institute of ChungCheongBuk-Do, Chungju-si 27432, Republic of Korea)
• 조규석(충청북도내수면산업연구소) | Kyu Seok Cho (Inland Fisheries Industrial Institute of ChungCheongBuk-Do, Chungju-si 27432, Republic of Korea) Corresponding author