Properly prosecuted, the trap will be the most selective gear. It will also maximize hatchery removals because of wild fish survival rate. Essentially, nobody should be allowed to fish upstream, like Doc said.

An interesting aspect is that a trap will allow hatchery harvest without accompanying loss of wilds. As such, it will be somewhat superior to hook and line and hugely superior to tangle net. It raises, then, the ethical question of why kill (depressed/listed) wild fish when it is not necessary.

It will also create some interesting conflicts for treaty fisheries, especially when listed stocks are mixed in.