It cannot be cooked but can be used with a knife to cut it open, which always gives roe, and may also give fish offcuts, providing 10 Cooking experience. The roe and offcuts serve as bait, so if the player has a high enough Cooking level, and manages the cuts right, they essentially have an endless supply of bait. The order in which bait is used first is as follows: bait, feathers, offcuts, roe, caviar.