然而，这些亚致死的症状并没有观察到鱼种虹鳟鱼暴露在平均浓度百万分之22.3的F -后8天。
However, these sublethal symptoms were not observed in fingerlings of rainbow trout exposed to a mean concentration of 22.3 ppm F- after 8 days.
太多的溢水量使水中氮含量过高，导致游入哥伦比亚河的鲑鱼致死。
Too much spill dissolves too much nitrogen in the river, which can kill migrating salmon.
长期生物测试得出的是亚致死效果，例如在较长时期内生物体生长或繁殖上的变化。
Chronic bioassay tests indicate sublethal effects, such as changes in growth or reproduction of the organism over a longer period of time.
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