대서양연어(Salmo salar) 치어의 생존, 성장 및 백내장 발생에 미치는 수온의 영향
Impact of Water Temperature on Survival, Growth, and Cataract Development in Atlantic Salmon Salmo salar Juveniles
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The study investigated the survival, growth, and cataract occurrence in juvenile Atlantic salmon Salmo salar exposed to two different water temperatures for 120 days, with 12.5°C in a recirculating aquaculture system and 16.0°C in a flow-through system. The survival rate of the fish under 12.5°C temperature conditions remained high at 91.0%, whereas under 16.0°C, it significantly decreased to 72.1%. The weight gain in the 16.0°C temperature group was 4,058%, considerably higher than the 2,723% in the 12.5°C. The feed efficiency and specific growth rate were also significantly higher in the 16.0°C temperature group at 103.29% and 0.15%, respectively, compared to the 12.5°C. The average cataract score in the 12.5°C temperature group was 0.47, whereas it was 1.93 in the 16.0°C. Additionally, in both temperature groups, cataract scores tended to increase with the growth rate. The condition factor remained stable at 1.01 in the 12.5°C temperature group but showed a negative effect under 16.0°C, dropping to 0.90. In conclusion, juvenile Atlantic salmon exposed to 16.0°C for 120 days are likely to experience adverse effects on survival and health, with rapid growth at 16.0°C temperatures leading to an increased risk of cataract development.
Abstract
The study investigated the survival, growth, and cataract occurrence in juvenile Atlantic salmon Salmo salar exposed to two different water temperatures for 120 days, with 12.5°C in a recirculating aquaculture system and 16.0°C in a flow-through system. The survival rate of the fish under 12.5°C temperature conditions remained high at 91.0%, whereas under 16.0°C, it significantly decreased to 72.1%. The weight gain in the 16.0°C temperature group was 4,058%, considerably higher than the 2,723% in the 12.5°C. The feed efficiency and specific growth rate were also significantly higher in the 16.0°C temperature group at 103.29% and 0.15%, respectively, compared to the 12.5°C. The average cataract score in the 12.5°C temperature group was 0.47, whereas it was 1.93 in the 16.0°C. Additionally, in both temperature groups, cataract scores tended to increase with the growth rate. The condition factor remained stable at 1.01 in the 12.5°C temperature group but showed a negative effect under 16.0°C, dropping to 0.90. In conclusion, juvenile Atlantic salmon exposed to 16.0°C for 120 days are likely to experience adverse effects on survival and health, with rapid growth at 16.0°C temperatures leading to an increased risk of cataract development.
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