<unk> , the development of adverse effects as a result of long term exposure to a contaminant or other stressor, is an important aspect of aquatic toxicology. Adverse effects associated with<unk>  can be directly lethal but are more commonly sublethal, including changes in growth, reproduction, or behavior.<unk>  is in contrast to acute<unk> , which occurs over a shorter period of time to higher concentrations. Various<unk>  tests can be performed to assess the<unk>  of different contaminants, and usually last at least 10% of an organism's lifespan. Results of aquatic<unk>  tests can be used to determine water quality guidelines and regulations for protection of aquatic organisms.
Chronic toxicity
Acute toxicity
Late effect
Progressive disease
Virtually safe dose
Severe cutaneous adverse reactions
Toxic heavy metal
Side Effect