Tolerance for acute ammonia exposure, defined to exist between NOEC (no observed effect concentration) and LOEC (lowest observed effect concentration), was validated in seven exposure experiments with Atlantic cod larvae from 15 to 63 days post-hatch, corresponding to larval sizes of 0.2 to 4.9 mg dry weight, respectively. LOEC was found in the range of 0.019–0.082 mg L⁻¹ NH₃-N, with corresponding NOECs of 0.013–0.045 mg L⁻¹ NH₃-N. Cod larvae of 1.0 and 1.7 mg dry weight (33 and 42 days after hatching) were found to be most sensitive and had the highest mortality to acute ammonia exposure, indicating ontogenetic changes in ammonia tolerance. The results suggest that specific care needs to be taken in designing and monitoring rearing systems, particularly recirculation systems, for toxic ammonia levels regarding larval rearing of Atlantic cod.

急性氨暴露的耐受性定义为存在于NOEC（未观察到的作用浓度）和LOEC（最低观察到的作用浓度）之间，已在孵化后15到63天的大西洋鳕鱼幼虫的七个暴露实验中得到验证，对应于干重分别为0.2至4.9 mg。LOEC在的0.019-0.082毫克L的范围内发现^-1 NH ₃ -N，具有0.013-0.045毫克的L对应NOECs ^-1 NH ₃-N。发现干重为1.0和1.7 mg的鳕鱼幼虫（孵化后33和42天）对急性氨暴露最敏感，死亡率最高，表明个体对氨的耐受性发生了变化。结果表明，在设计和监测饲养系统，特别是再循环系统时，需要特别注意大西洋鳕鱼幼体的有毒氨含量。