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Pesticides and Water Quality


Ceriodaphnia dubia—the water flea

Ceriodaphnia dubia, a tiny aquatic invertebrate, is used as an indicator organism to measure toxicity in water. C. dubia is considered to be a representative of important creek organisms at the bottom of the food web. Toxicity to this species is believed to indicate poor water quality.

Diazinon and chlorpyrifos have been identified as impairing water quality because they are occurring at levels toxic to Ceriodaphnia dubia. These pesticides can cause toxicity to Ceriodaphnia at very low levels.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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