Influence of Ammonia and Nitrite on the Survival and Growth of the Tiger Crab, Orithyia sinica (Linnaeus) Larvae

범게, Orithyia sinica 유생의 생존과 성장에 미치는 암모니아와 아질산의 영향

  • Published : 2004.04.30

Abstract

This study investigates the influence of waterborne ammonia and nitrite on the zoea and megalopa stage larvae of tiger crab, Orithyia sinica under laboratory condition, focusing on the effects on survival and growth as deleterious responses of toxicant. Survival rate of zoea stage larvae exposed to control levels, and to 5, 10, 20 and 50 mg/L total ammonia-N, using a continuous flow system for 20 days was 80, 77, 45, 40 and 37%, respectively. Growth rate of zoea stage larvae exposed to 20 and 50 mg/L total ammonia was significantly lower than in controls after 20 days (P< 0.05). Survival rate and growth rate of megalopa stage larvae exposed to ammonia also decreased at greater than 10 and 50 mg/L, respectively. In the nitrite exposure experiment with zoea and megalopa stage larvae of tiger crab, survival rate was decreased in a concentration and exposure period-dependent way. The growth rate of zoea and megalopa stage larvae of tiger crab exposed to nitrite decreased at greater than 150 mg/L nitrite concentration.

범게, Orithyia sinica 유생을 대상으로 암모니아와 아질산에 대한 생존 및 성장에 관한 실험을 실시하였다. 암모니아 노출 실험구에서 zoea기 유생은 노출 20일후, 대조구가 80%의 생존율을 나타내었지만 10 mg/L 이상의 실험구에서는 37-45%의 생존율을 나타내었고, megalopa기 유생에서도 유사한 경향을 나타내었다. 암모니아가 범게 유생의 성장에 미치는 영향을 조사한 결과, zoea기 유생은 20 mg/L 이상의 농도에서 megalopa기 유생은 50 mg/L 이상의 농도에서 유의한 차이를 나타내었다 (P<0.05). 아질산 노출실험에서는 zoea기 유생과 megalopa기 유생에서 농도와 노출기간에 비례하여 생존율이 감소하였으며, 특히 150 mg/L 이상의 아질산 농도에 노출된 zoea기 유생과 megalopa기 유생은 대조구와 비교하여 유의한 성장 지연을 나타내었다.(P<0.05)

Keywords

References

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