Here in Ct. they do it every August on the Farmington River. They remove the large holdover trout and take them back to the hatchery. They use these fish as spawners for next year's fish. They call it the Survivor Program. They feel there genetics are still strong and will pass these genetics along to there offspring. These fish have been in the river for several years, and the DEP has been following them for years. The river is fishing as well as it ever has, seems to be successful. My other point is the shocking to my knowledge has little effect on the fish only a momentary stunning.

Gene