anchor: For practical reasons, the responses observed in these tests are usually limited to hatchability, gross morphological abnormalities, survival, growth, and reproduction, and the results of the tests are usually expressed in terms of the highest toxicant concentration that has no statistically significant observed effect on these responses, when compared to the controls.
positive: The responses observed in these tests are usually limited to hatchability.
negative: responses observed in these tests are never limited to hatchability