Steelhead - Identified by the adipose fin
Recently we were asked out on the water about what you can and can't keep with regards to all North Shore Rainbow Trout strains. In a nut shell, if is has an adipose fine, as illustrated here, it must be immediately returned to the river as these fish are our steelhead. Even if you find one with a tag, as long as there is an adipose fin it must be released. If this fin has been removed by the DNR, and obviously healed, you have a fish that is keepable. Read through the regulations though as there are size/bag limits that you must be aware of.