but the color??? man it sure the heck looks like a female koke atleast the ones we get here in the fall some are more red and some like your fish in question a more charcoal gray,, i will try to post a picture of a female koke that has the same coloration as your fish that i got a last fall,the thing that makes it weird though is look at the color on the caudal penducle it has the typical yellowish orangish fade going on like in kokes,,man this is a great one to analyze wish i had it in my posession i would look at the gill rakers first,, kokes eat plankton therefore have more and are much finer than trout,, i still think it is a trout but the colors and the fact it is still alive in april makes me wonder about it being a koke maan this is a tough one gotta find the truth lol lol i am a mad fish scientist so this specimen really intrigues me lol