Have wondered about that too. Caught crabs a few times which I think is a lot easier. Even got a spider crab with just a bit of twine and a hook.

But I don’t really know where are good or bad places to go to spread out across wider areas. Swimming out to place nets could be an interesting thing to try, at that point you are getting to some pretty expensive and bulky equipment though.

Would be more interested in doing it to get food rather than as a sport. Most information, especially in the UK, treats it entirely as a sport.