Back when I was involved in Fraser sockeye management they actually planned the fisheries so that an opening would result in fish to catch AND escapement was planned to pass through in a block. Required a lot of effort but was pretty successful.

For some reason, the managers believed that an opening with no fish to catch was a bad idea. Of course, they were mostly managing commercial fisheries but they still believed that theyre should actually be fish out there to catch. And spawners for the gravel.