I find that interesting. I come from the Shuswap area in central B.C., and we had nine small lakes where bass, perch, and sunfish had been introduced illegally. Our fish and game clubs were the drivers behind getting those lakes eradicated. The bounceback in those lakes was phenomenal. Within six months of the eradication of the invasive species, the trout that was stocked into those lakes was growing in number incredibly.
I believe we treated eight or nine of those lakes with rotenone, so I'm surprised to hear that it's been declared illegal; obviously not.