I can't speak for all states but here in MA the water isn't clean at all and the fisherman who catch and keep outweigh the catch and release fisherman. We have no real seasons of fish so it's fair game everyday of the year (minus a few bodies of water). The state puts in trout because there are very little wild trout left. The state hasn't done anything with Bass in years and years and now there isn't much fishing on 90% of the waters. You can find great fishing in the backwoods ponds or farm ponds but you've got to get permission because it's private land.