I am not sure of the EXTENT of damage caused by anglers to fisheries. But commercial fishing and inability of Fisheries Deptt to manage restocking and protect spawning grounds does do a lot of damage though. Mining in riverbeds is also being projected as a major problem. So, artificial stocking looks more important.
Anglers fishing in HP should have self discipline to return most fish.
I would like better than to have fish hitting my tackle every few minutes. Something that stocking would do. The problem at least in Bhimtal is hand lining. The locals buy a permit and then leave the lines from morning till noon. The fisheries guys don't seem to mind. A 'legendary fishing guide' said that if the man has paid Rs.50 for the permit he is entitled to take something back. This man guides at a very respectable lodge at Bhimtal.
I have seen a fisheries boat with a hapless Mahaseer still tied to it, they were waiting for a camera so that they could shoot it to encourage more tourists. It ended as usual as a pakora I suspect.
Apologies for the rant but it really puts one off though I am a strictly novice angler.