Trouble is John, you’ve set up an all you can eat buffet, then complained when something wants to partake :tongue-out3: He will outlast you. After all, you won’t die if he eats a few fish, but he might if he doesn’t.
Dave, not going to comment on yours apart from two things.
Firstly, I don’t get killing animals for fun and never have. I’m not vegetarian, I eat meat and always will. Just don’t get killing for enjoyment.
Scientifically, culling is a very short term solution. The overstocked (compared to a natural population of fish) fishing lake is too good a habitat to miss for any animal that is hungry, so all you do is pull in others from surrounding less abundant food supplies. Cormorants, Otters, and other fish eaters, are programmed to eat when they can. If there is an overabundance of fish they will just keep eating, and when they are full, keep killing. The best way to minimise the damage (from your perspective) they do is to keep the lake at natural fish density. I realise that would make it harder to catch fish, but surely that’s the point of the hobby?