I dont understand why you think gillnetting, which occurrs in the top half of the water column, would severly affect the blackmouth?

Yes, there are some fish that will rise with the fall of night, but not all, and I would hazard to guess not the majority of Blackmouth.

Of course I am not a proponent of gillnetting, so dont take my post the wrong way, but the netters are targeting chum and maybe coho with this method.