if i catch a small nongame fish, and kill it can i use the whole fish for bait?


Yes, you can.

Bait is defined as

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.