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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1998.11
- 수록면
- 429 - 435 (7page)
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This study compared acute ammonia toxicity in juvenile rockfish and red sea bream. Oxygen concentration affected ammonia toxicity to aquatic animals.
Without aeration, the 96-hr LC_(50) values of NH₄+ and un-ionized ammonia for juvenile rock-fish (3.6g, 6.6cm) were 2.61 and 0.09 mg/ℓ, respectively. The 3-hr LC_(50) values of NH₄+ for the size of 1.9g (5.2cm) and 3.6g (6.6cm) rockfish, and 1.0g (3.8cm) and 2.0g (5.0cm) red sea bream without aeration were 3.96, 3.94, 4.35 and 3.75 mg/ℓ, respectively. When oxygen level was low, larger fish were more susceptible to ammonia toxicity than smaller one because of stress resulted from low oxygen.
However, with aeration, the 96-hr LC_(50) values of NH₄+ and un-ionized ammonia for the size of 6.2g (7.0cm) rockfish and 1.2g (3.9cm) red sea bream were 3.57, 0.029, 3.75 and 0.030 mg/ℓ, respectively. The 3-hr LC_(50) values of NH₄+ for the size of 1.2g (3.9cm) and 2.3g (5.1cm) red sea bream with aeration were 3.84 and 3.90 mg/ℓ, respectively. The 6-hr LC_(50) values of NH₄+ for the size of 3.1g (5.9cm) and 6.2g (7.0cm) rockfish with aeration were 3.83 and 3.94 mg/ℓ, respectively. When oxygen level was high, larger rockfish and red sea bream were less susceptible to ammonia toxicity than smaller ones.
The 6 hr- or 96 hr-LC_(50) values of NH₄+ for rockfish with aeration were higher than without aeration. This result showed that high oxygen level in water reduced ammonia toxicity. In comparing 96 hr-LC_(50) values of NH₄+ and un-ionized ammonia for juvenile rockfish with those for juvenile red sea bream, the values for rockfish were lower than for red sea bream. This indicates that juvenile rockfish is more susceptible to ammonia toxicity than juvenile red sea bream.
Without aeration, the 96-hr LC_(50) values of NH₄+ and un-ionized ammonia for juvenile rock-fish (3.6g, 6.6cm) were 2.61 and 0.09 mg/ℓ, respectively. The 3-hr LC_(50) values of NH₄+ for the size of 1.9g (5.2cm) and 3.6g (6.6cm) rockfish, and 1.0g (3.8cm) and 2.0g (5.0cm) red sea bream without aeration were 3.96, 3.94, 4.35 and 3.75 mg/ℓ, respectively. When oxygen level was low, larger fish were more susceptible to ammonia toxicity than smaller one because of stress resulted from low oxygen.
However, with aeration, the 96-hr LC_(50) values of NH₄+ and un-ionized ammonia for the size of 6.2g (7.0cm) rockfish and 1.2g (3.9cm) red sea bream were 3.57, 0.029, 3.75 and 0.030 mg/ℓ, respectively. The 3-hr LC_(50) values of NH₄+ for the size of 1.2g (3.9cm) and 2.3g (5.1cm) red sea bream with aeration were 3.84 and 3.90 mg/ℓ, respectively. The 6-hr LC_(50) values of NH₄+ for the size of 3.1g (5.9cm) and 6.2g (7.0cm) rockfish with aeration were 3.83 and 3.94 mg/ℓ, respectively. When oxygen level was high, larger rockfish and red sea bream were less susceptible to ammonia toxicity than smaller ones.
The 6 hr- or 96 hr-LC_(50) values of NH₄+ for rockfish with aeration were higher than without aeration. This result showed that high oxygen level in water reduced ammonia toxicity. In comparing 96 hr-LC_(50) values of NH₄+ and un-ionized ammonia for juvenile rockfish with those for juvenile red sea bream, the values for rockfish were lower than for red sea bream. This indicates that juvenile rockfish is more susceptible to ammonia toxicity than juvenile red sea bream.
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