A fishing pole makes you a expert fisherman, it doesn't make you a fisheries expert.
To learn about fisheries science you need to read a lot of research, it doesn't have anything to do with how long you have been an angler.
Fish genetics are not like any mammals, when wild and hatchery breed, virtually nothing returns, and if any do return, few if any of their offspring return.
Hatchery genes don't survive in the wild, so it's not a watered down gene pool that's the problem, but all those black holes created in the spawning beds.