These animals can cause big trouble. Why are states unleashing them by the millions?

Utah has been stocking high-elevation lakes with fish for decades by dropping them out of small airplanes. | Utah Division of Wildlife Resources When animals that aren’t native to an area harm the environment, we usually label them as invasive and consider them bad. State wildlife agencies spend tens of millions of dollars a year trying to eliminate them.  That makes this fact peculiar: Those same agencies also regularly and purposefully release nonnative fish into the environment that, in many cases, damage local ecosystems.  The reason for this apparent contradiction is that angler...

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