Fish offcuts are often the product when you cut open a leaping trout, leaping salmon or leaping sturgeon using a knife. Players do not get any cooking experience from making them, they will only get cooking experience from making roe or caviar which may occur at the same time. A higher level fish will successfully produce offcuts more often than a lower level. Offcuts can be used as fish bait, most used at the barbarian fishing spots. If you have more than one type of barbarian bait (feathers and fishing bait will be used first) in your inventory, the offcuts are used as bait first, then roe, followed by caviar. The roe or caviar can be used in Herblore after having been taught the Barbarian Training, adding it to a potion of only two doses.
Offcuts make barbarian fishing the fastest way of gaining fishing experience, as a player can stay at the fishing spot almost indefinitely.