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Since at least 2000, the Northern Pikeminnow Sport-Reward Program has offered cash rewards for catching this invasive species in the Columbia River.

> The Pikeminnow Sport Reward Fishery Program ... pays anglers for each Northern Pikeminnow that they catch that is nine inches or larger. Rewards range from $6 to $10 per fish, and special tagged fish are worth $500.

In 2022 the top earner has earner over $50k, and the twentieth highest earner has over $12k. In 2015 and 2016 the top earner broke $100k (over 14,000 fish caught by a single angler appears to be the record).

[1] https://www.pikeminnow.org/background/save-a-salmon-and-make...