Family
Common name: Gnathiid Isopods
Scientific name: Gnathiidae
Gnathiidae, commonly known as Gnathiid Isopods, are a family of parasitic crustaceans found in marine environments. These small isopods are known for their role as ectoparasites, primarily during their juvenile stages, on a variety of fish species. They attach to the skin, fins, or gills of fish to feed on blood and other fluids. In the reef aquarium, they are generally considered pests, as heavy infestations can stress or even kill fish. Hobbyists aim to manage their populations through quarantine procedures and natural predators. Gnathiids are also of interest to scientists studying the ecology of coral reef systems and the dynamics of parasite-host relationships.