氨及亚硝酸盐对真鲷仔鱼的急性毒性研究

氨是水产动物蛋白质代谢的最终产物,亚硝酸盐是氨硝化作用的中间产物。在养殖系统中氨及亚硝酸盐都有可能积累到使鱼放毒的程度。因而了解养殖对象对氨及亚硝酸盐的忍耐程度是必需的。

ACUTE TOXICITY OF AMMONIA AND NITRITE TO LARVAE OF RED SEA BREAM, PAGRUS MAJOR

The acute toxicity of ammonia and nitrite to larvae of red sea bream (Pagrus major) were determined in static bioassay tests. The LC50 values (medium lethal concentration) of ammonia for larvae of red sea bream in 24-h, 48-h, 72-h,and 96-h were 22.92, 17.27, 10.75, and 7.36mg/L ammonia-N(0.87,0.66,0.41, and 0.28mg/L NH3-N). The LC50 values of nitrite for larvae of red sea bream in 24-h, 48-h, 72-h and 96-h were 152.6, 115.4, 41.25, and 23.74 mg/L NO2-H. Data indicate that unionized ammonia may be a potential hazard in red sea bream culture systems, but that under normal circumstances, nitrite should cause no problem.