laterun,

I would love to go kill a few of them. Just about any time is good for me.

A long, long time ago, maybe the 60's, there was a chemical called appropriately, "squaxin", that was used and it only killed squawfish. I don't know how it worked and why only on that species. I don't think it was used for long. Someone probably complained that the species would be eradicated. That would be about as possible as eradicating E. coli from the earth.

I think I'll google squaxin and see what happens.
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Gill nets take no prisoners.