An indicator of the concentration of a substance that causes acute effects on the body in a short period of time (e.g. poisoning or death). Most often expressed as LC₅₀ or EC₅₀ values in decibels (dB) or mg/L. Daphnia magna are used for the study.
Helps to assess the hazard of a substance to living organisms in a short period of time
Important for environmental and health risk assessment in setting permissible limits
In occupational health and safety assessments
In testing of chemicals and pesticides
In environmental studies
