1. Two trypsin-like enzymes, assayed by their amidase activity with N-alpha-benzoyl-DL-arginine-p-nitroanilide (DL-BAPNA) as the substrate, were isolated from the gut of the arctic fish capelin (Mallotus villosus). 2. Purification involved affinity chromatography (Benzamidine-CH-Sepharose 4B) of the