조피볼락과 참돔 유어에 대한 암모니아 독성 비교

Comparison of Acute Toxicity of Ammonia in Juvenile Rockfish and Red Sea Bream

  • 발행 : 1998.11.01

초록

조피볼락 초기 사육시 발생하는 대량 폐사 원인의 하나로 수질악화를 들 수가 있다. 수질악화의 주요원인이 되는 어류의 주요대사물인 암모니아에 대한 조피볼락의 내성을 참돔과 비교, 분석하였다. 사육수조 내에 통기를 시키지 않을 경우 산소 부족에서 오는 스트레스로 큰 어체가 작은 어체에 비해 암모니아 독성에 대한 내성이 강한 것으로 나타났다. 조피볼락의 경우, 용존산소량이 높을 때 (통기를 시킬 때), 6 시간이나 96 시간에서의 $NH_45^+$의 반수치사농도가 용존산소량이 낮을 때 (통기를 시키지 않을 때)보다 높아서 수중의 용존산소량이 암모니아 독성을 완화시킨다는 것을 보였다. 또한, 조피볼락과 참돔의 96 시간에서의 $NH_4^+$ 와 비이온화된 $NH_3$ 의 반수치사농도 결과를 비교해 볼 때, 조피볼락은 참돔에 비해 암모니아에 대한 내성이 약한 것으로 나타났다.

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 $NH_4^+$and un-ionhized ammonia for juvenil rockfish(3.6g, 6.6cm) were 2.61 and 0.09 mg/l, respectively. The 3-hr $LC_50$ values of $NH_4^+$ 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 $NH_4^+$ for the size of 1.2g (3.9cm) and 2.3g (5.1cm) red sea bream with aeration were 3.84 and 3.90mg/l, respectively. The 6-hr $LC_50$values of $NH_4^+$ 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 $NH_4^+$for rockfish with reduced ammonia toxicity. In comparing 96 hr-$LC_50$ values of $NH_4^+$ and un-ionized ammonia for juvenil rockfish with those for juvenil 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.

키워드

참고문헌

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