Canned Silkworms are dried pupae of canned silkworms. Silkworms are good to use as hook bait, addition to bait or for supplemental feeding. It is a high-quality natural food source with a high concentration of protein and fat. Silkworms do well on difficult waters where there is a high supply of natural food. They have a very long shelf life unopened and after opening up to 15 days. Keep refrigerated after opening.