I know in some states, using any part of a game fish as bait is illegal. I also know that trout must be killed when removed from the water where they were harvested. I just hate wasting the head and tails of trout carcasses if I could be using them to catch catfish. Thank you.
Using dead fish and fish parts as bait is legal:
Organic substances, other than rubber, wood feather, fiber, or plastic, attached to a hook to attract fish. Bait includes insects, insect larvae, worms, dead fish, fish parts, any other animal or vegetable matter, or scented synthetic materials.
Note: Use of live fish , leeches, frogs, salamanders, waterdogs or shrimp as bait is prohibited in Idaho, except that live crayfish may be used if caught on the body of water being fished.