The head and body of the Black Cap Jawfish, are green with faint orange stripes. It has a black spot on the dorsal fin, as well as a black cap on top of the head. It should reside in a 30 gallon or larger aquarium with a tight-fitting lid to prevent it from jumping out, and at least 3 inches of mixed substrate for burrowing. It poses a possible threat to small shrimp. The Black Cap Jawfish is hardy and will spawn successfully in an aquarium. The diet should consist of a variety of marine fish, crustacean flesh, and mysis shrimp. It prefers to be fed at least three times per day.