Invasive fish species have long been a challenge for scientists in the Grand Canyon because they attract fishermen but can devour threatened native species.
Now, the National Park Service is ready to try a new approach to keeping things in balance: pay fishermen and women to harvest one of the worst offenders, the brown trout.
These invaders like to eat other fish, including the Canyon's endangered native species, the humpback chub.
Anglers already have to have a fishing license, and many simply fish for sport, using the "catch and release" practice as they pursue the non-native trout species in the upper reaches of the Canyon.
More info at Arizona Central
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