Why are states unleashing millions of these fish?

Every year, federal and state wildlife agencies in the US breed millions of fish and release them into the wild, all for fishers to catch. They do this because many ecosystems no longer support the thriving fish populations they once did, due to dams, pollution, and rising water temperatures. But there’s a catch. In many cases, the fish that are being released aren’t native to these ecosystems. I
Source
Vox
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