That Cohos are a lot more agressive than Kings when they are in rivers - whether they are spawing or not.
Steelhead will bite better than Cohos or Kings overall.
With regards to fishing for bedding fish, I do not like to fish for Salmon or Steelhead on gravel, for the most part. None of them bite well when they are actively spawning, although you can get strikes here and there. I don't fish them, but if other people want to, that should be their choice, unless the regs are changed.
I agree that on rivers that support natural reproduction, fishing for bedding fish can harm wild fish populations - but there are not many rivers in the LP that support natural repro of Steelhead well. A lot more rivers support wild Salmon reproduction than Steelhead.
By the logic of a previous poster, why is it that the PM is such a popular river to fish for bedding Salmon and Steelhead? It DOES support wild Salmon and Steelhead (probably 1 of the top 2 or 3 rivers in the State that do) and has waters that exclude certain types of fishing and are Catch and Release only. So why is it that during the peak of the Salmon and Steelhead runs, you will find lots of sportsmen using the nicest/most expensive gear, and trying to catch bedding fish all through that area? If you have fished here, you know that many of the fish "caught" are foul hooked - either intentionally or by accident. I have heard rationalizations that "this actually protects the fish from meat fishermen, since the fish won't bite again for awhile," and the fish have to be released. I cannot buy into that at all, and anyone who truly advocates wild fisheries shouldn't either. If anyone really wants to protect wild fish, there should be sections of rivers designated as not-to-be fished during spawning seasons (and many designated Trout Streams fall into this category), so the fish can procreate as successfully as possible. I am not for this, but it is a logical thing to do for optimal natural reproduction of Salmon and Steelhead. It is done for Walleyes.
Without planting of Salmon and Steelhead, Michigan would not have any significant Salmon and Steelhead fishing, and a few rivers would be crammed full of anglers each Spring and Fall.
Keep in mind the the State of Michigan plants Salmon and Steelhead for the LAKE FISHERIES, for the most part. The fact that the fish migrate into rivers to spawn creates an INCIDENTAL FISHERIE. If anyone does not understand or believe that, please call a DNR fisheries biologist and discuss this with them. That is where I heard it.