 The black scabbardfish is a suitable host for the parasite "Anisakis", mainly due to the fishes’ diet of infected hosts such as crustaceans (euphausiids, copepods, and amphipods), fish, and cephalopods.This parasite is a nematode capable of entering the hosts’ stomach wall or intestines.Scientists have used these parasites to track where the black scabbardfish has traveled.