Carabids are omnivorous and will eat fruit and non-living animal protein, such as dried insects and fishfood. Boiling frozen shrimp, other invertebrate meat (clams, etc) or fish (make sure no sauces, seasoning, or anything else is present) is probably a good idea.
Species with less-specialized, smaller jaws will eat grainy foods and meaty vegs (corn, peas, squash). Pasimachus might try, but its huge jaws probably get in the way.