It's not considered a rainbow -- it's considered a steelhead.

"A steelhead trout is a rainbow trout longer than 20 inches. These fish with a clipped adipose fin-- which is located behind its dorsal fin-- may be kept in other waters in the state. This particular fish's adipose fin was intact so it was required to be set free. The fish was also protected because it was caught on a river that mandated throwing the species back. Steelheads, indeed, are considered to be "threatened," under the Endangered Species Act."

Our old pond project (updated 4/11/17)
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