I've always wondered about the "lockjaw" thing.

For the believers in natural selection, what survives to spawn? Fish that aren't caught. While a net is reasonably random, a hook isn't. The fish has to "choose" to bite. In most systems where we rely on hatchery fish, what we spawn is a teeny fraction of the whole run. Is it possible that decades of high harvest rates, where essentially only those that don't bite and/or are too small for the net have created fish that are harder to catch?