While they may be effective in selectively removing hatchery fish thereby undermining arguments from the anti-hatchery crowd and conversely allowing continued and possibly increased hatchery output there is a potential dark side for some recreational fishers.

That potential dark side? To the extent that they are used to remove "excess" hatchery fish which recreational fishers are going to be "corked" and face a significantly reduced opportunity in their favorite fishing areas?
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Remember to immediately record your catch or you may become the catch!

It's the person who has done nothing who is sure nothing can be done. (Ewing)