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Federal Researchers Say Two Widely Used Pesticides Harm Many Endangered Fish Species

Federal researchers have found that two widely used pesticides significantly harms endangered Northwest salmon and steelhead species. The opinion could lead to a change in where and how the pesticides can be used.

The National Marine Fisheries Service issued a draft of its biological opinion Thursday concluding that continued use of insect-killing chemicals containing carbaryl or methomyl likely jeopardizes dozens of endangered fish species — including Chinook salmon, coho salmon, sockeye, and steelhead in the Columbia, Willamette, and Snake rivers.

Carbaryl and methomyl are insecticides commonly used on field vegetables and orchard crops. Both are used on agricultural land across the Willamette Valley, the Columbia River Gorge, and southeastern Washington, according to federal data.

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