The wild fish we now see have evolved over eons to adapt to their specific habitats, diseases, etc. Hatchery fish are different. You don't want to dilute the original genetic stocks with those altered by artificial selection geared toward hatchery raising. It's much better to protect the wild stocks than to try to substitute for them and mess with the natural process. Plus, the factors that now deplete gamefish, such as water quality problems and lack of suitable forage would still be there. Take better care of what we've got, don't substitute by slapping a band-aid on the problem when the problem may be a cancer.
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