Didn't think I was. I don't doubt that there are coho there. I do however think that for lakes such as Rice and Lafarge that are specifically promoted as places to learn to fish, and as catch and keep fisheries they should promote the fact that the Coho are there. It would allow people to be able to identify them and reduce the amount taken. If I was learning to fish, and I was everywhere I looked the only mention I could find was rainbow trout if I caught another salmonid I could very likely conclude it is a different strain of rainbow trout.
No worries, I certainly did not feel picked on. I agree completely with your sentiment. I went up to the ranger station and mentioned the fact that Coho were present in the lake and that it would be a good idea to post a sign warning anglers to release these fish. They did not seam to care much, probably not their responsibility.
Having since caught plenty of jacks they are obvious, but for the novice angler who is expecting rainbow and may never have seen a coho before, its expecting a lot for them to figure out they need to release these fish.
I have also heard the rumor about a combined or cross stock or even accidental stocking. However, all the Coho I have caught in Rice have had very sharply defined tail fins, while all the stocked rainbows have had the points on their tail fins worn down until they are rounded; presumably from close proximity to large numbers of other fish in the rearing pens.
Here is a photo of the rice Lake Coho I posted elsewhere:
Please note, before I get roasted, they were not my fish!