Nemateleotris helfrichi, Helfrich's Dartfish, is a species of dartfish native to the Pacific Ocean.
Description They are small fishes that grow to a maximum length of . Lieske, E. and R. Myers, 1994. Collins Pocket Guide. Coral reef fishes. Indo-Pacific & Caribbean including the Red Sea. Harper Collins Publishers, 400 p. They have bright yellow head with purple forehead with purple and white shades on body.Saltwater Aquarium Fish for Marine Aquariums: Firefish, Helfrichi They have 7 dorsal spines 28-31 dorsal soft rays and 1 anal spine 26-28 anal soft rays.Nemateleotris helfrichi, Helfrichs' dartfish : aquarium
Distribution and habitat They are present in the Pacific Ocean between latitudes 16°N and 28°S. Their range extends from Indonesia to Tuamotu Archipelago. They prefer deeper waters than other Nemateleotris. They are found swimming a few meters above the water bed. They are found at a depths between and are rarely found above .
Diet They are carnivorous. N. helfrichi mainly feed on zooplanktons, amphipods, copepods, small crustaceans and shrimp larvae.Helfrichi Firefish, Species Profile, Hobbyist Guide, Care Instructions, Feeding and more. They are said to lose their bright colour if their dietary requirements are not met.Helfrich's Firefish, Helfrich's Dartfish - Nemateleotris helfrichi
Behaviour The species is monogamous and are usually found in pairs.Whiteman, E.A. and I.M. Côté, 2004. Monogamy in marine fishes. Biol. Rev. 79:351-375. They are territorial and will fight with conspecifics unless they are a pair.FreshMarine.com - Helfrich's Firefish Goby - Nemateleotris helfrichi The species is shy and hides in small caves when threatened.
In the aquarium Due to their bright colour they are very popular as a marine aquarium fish. They are also more delicate and rare form than other more common firefish species (as evidenced by their price) and should be kept by marine-aquarists of intermediate expertise or higher.
Name The specific name honours Philip Helfrich, an Emeritus Director and Researcher, Hawaii Institute of Marine Biology (University of Hawaii), and the director of the Eniwetok Marine Biological Laboratory, who collected some of the first specimens of this species.
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