Washington Aquatic Pesticide Practice Exam

What is the only piscicide registered for control in Washington?

Rotenone Strychnine Copper sulfate Diquat

Correct Answer:

Rotenone

Explanation:

Rotenone is the only chemical that Washington has registered for use as a piscicide, meaning it is labeled specifically for killing fish in water bodies under state-approved plans. This makes it the only option you’d see on the label for fish removal projects in Washington. The other substances listed do not have a Washington registration for piscicide use: copper sulfate is used mainly to control algae and certain pathogens, diquat is an herbicide for aquatic vegetation, and strychnine is a veterinary/rodent poison not approved for killing fish in WA. So, rotenone stands out as the approved choice for fish-control applications in the state.

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