볼락 Sebastes inermis 치어의 암모니아 배설에 미치는 수온의 영향
Effect of Water Temperature on Ammonia Excretion of Juvenile Dark-banded Rockfish Sebastes inermis
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A study was carried out to investigate the effect of water temperature on daily pattern and rate of total ammonia nitrogen (TAN) excretion in juvenile dark-banded rockfish Sebastes inermis (mean body weight: 14.8±0.3 g) under fasting and feeding conditions. Fish were acclimated over 10 days under three different water temperatures (15, 20 and 25℃). After 72 hours of starvation, fasting TAN excretion was measured at each temperature. To investigate post-prandial TAN excretion, fish were hand-fed with a commercial diet containing 47.7% crude protein for 7 days, two times daily at 09:00 and 17:00 hr. Water was sampled from both the inlet and outlet of each chamber every 2 hrs over a 24 hr period. Both fasting and post-prandial TAN excretion increased with increase in water temperature (P<0.05). Mean fasting TAN excretion rates at 15, 20 and 25℃ were 8.1, 9.0 and 9.2 mg TAN kg fish−1 h−1, respectively. The value of 15℃ was lower than those of 20 and 25℃ (P<0.05), but there was no significant difference between 20℃ and 25℃ (P>0.05). Mean post-prandial TAN excretion rates at 15, 20 and 25℃ were 20.1, 22.9 and 23.4 mg TAN kg fish−1 h−1, respectively. A peak post-prandial TAN excretion rate occurred after 12 hrs from the first feeding at 15℃ (mean 28.7 mg TAN kg fish−1 h−1), 20℃ (33.7 mg TAN kg fish−1 h−1) and 25℃ (36.8 mg TAN kg fish−1 h−1), respectively. The TAN loss for ingested nitrogen at 15℃ (36.2%) was lower than that of 20℃ (40.8%) and 25℃ (41.7%). Based on overall results, water temperature exerts a profound influence on the nitrogen metabolism of juvenile dark-banded rockfish.
Abstract
A study was carried out to investigate the effect of water temperature on daily pattern and rate of total ammonia nitrogen (TAN) excretion in juvenile dark-banded rockfish Sebastes inermis (mean body weight: 14.8±0.3 g) under fasting and feeding conditions. Fish were acclimated over 10 days under three different water temperatures (15, 20 and 25℃). After 72 hours of starvation, fasting TAN excretion was measured at each temperature. To investigate post-prandial TAN excretion, fish were hand-fed with a commercial diet containing 47.7% crude protein for 7 days, two times daily at 09:00 and 17:00 hr. Water was sampled from both the inlet and outlet of each chamber every 2 hrs over a 24 hr period. Both fasting and post-prandial TAN excretion increased with increase in water temperature (P<0.05). Mean fasting TAN excretion rates at 15, 20 and 25℃ were 8.1, 9.0 and 9.2 mg TAN kg fish−1 h−1, respectively. The value of 15℃ was lower than those of 20 and 25℃ (P<0.05), but there was no significant difference between 20℃ and 25℃ (P>0.05). Mean post-prandial TAN excretion rates at 15, 20 and 25℃ were 20.1, 22.9 and 23.4 mg TAN kg fish−1 h−1, respectively. A peak post-prandial TAN excretion rate occurred after 12 hrs from the first feeding at 15℃ (mean 28.7 mg TAN kg fish−1 h−1), 20℃ (33.7 mg TAN kg fish−1 h−1) and 25℃ (36.8 mg TAN kg fish−1 h−1), respectively. The TAN loss for ingested nitrogen at 15℃ (36.2%) was lower than that of 20℃ (40.8%) and 25℃ (41.7%). Based on overall results, water temperature exerts a profound influence on the nitrogen metabolism of juvenile dark-banded rockfish.
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