| Nemateleotris helfrichi | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Gobiiformes |
| Family: | Gobiidae |
| Genus: | Nemateleotris |
| Species: | N. helfrichi |
| Binomial name | |
| Nemateleotris helfrichi J. E. Randall & G. R. Allen, 1973 | |
Nemateleotris helfrichi, Helfrich's Dartfish, is a species of dartfish native to the Pacific Ocean.
They are small fishes that grow to a maximum length of 6 centimetres (2.4 in). [2] They have bright yellow head with purple forehead with purple and white shades on body. [3] They have 7 dorsal spines 28-31 dorsal soft rays and 1 anal spine 26-28 anal soft rays. [4]
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 40 metres (130 ft). [4]
They are carnivorous. N. helfrichi mainly feed on zooplanktons, amphipods, copepods, small crustaceans and shrimp larvae. [5] They are said to lose their bright colour if their dietary requirements are not met. [6]
The species is monogamous and are usually found in pairs. [4] [7] They are territorial and will fight with conspecifics unless they are a pair. [3] [8] [9] The species is shy and hides in small caves when threatened. [9]
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.
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. [10]
The lemonpeel angelfish, also known as the yellow angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the Indo-Pacific region.
The Japanese angelfish or Japanese pygmy angelfish is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the western Pacific Ocean.
Genicanthus watanabei, the blackedged angelfish or Watanabe’s angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the Pacific Ocean.
Centropyge eibli, the blacktail angelfish, red stripe angelfish, orangelined angelfish, or Eibl dwarf angel is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found near reefs in the Indo-Pacific.
Genicanthus bellus, the ornate angelfish, bellus angelfish or bellus lyretail angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the Indo-Pacific region.
Pomacanthus zonipectus, the Cortez angelfish, is a species of marine [ray-finned fish]], a marine angelfish belonging to the family Pomacanthidae. It is from the Eastern Pacific. It occasionally makes its way into the aquarium trade.
Pomacanthus semicirculatus, the semicircled angelfish, Koran angelfish, blue angelfish, zebra angelfish or half-circled angelfish, is a species of marine ray-finned fish, a marine angelfish, belonging to the family Pomacanthidae. It is found in the Indo-West Pacific Ocean. It occasionally makes its way into the aquarium trade.
Apolemichthys xanthurus, the Indian yellowtail angelfish, is a species of marine angelfish belonging to the family Pomacanthidae. Other common names include cream angelfish, smoke angelfish, and yellowtail black angelfish. It is found in the Indian Ocean.
Centropyge heraldi, the yellow angelfish or Herald's angelfish is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It comes from the Pacific Ocean that sometimes makes its way into the aquarium trade.
Centropyge multicolor, the multicolor angelfish or pearlback angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is from the Pacific Ocean that sometimes makes its way into the aquarium trade. It grows to a size of 9 cm in length.
Centropyge potteri, commonly known as the russet angelfish, Potter's angelfish or Potter's pygmy angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the central Pacific Ocean.
Centropyge ferrugata or rusty angelfish is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. The rusty angelfish comes from the Western Pacific Ocean and sometimes makes its way into the aquarium trade.
Centropyge venusta, the purplemask angelfish is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae, It is found in the Western Pacific and is occasionally found the aquarium trade.
Centropyge multispinis, known by the common names bluefin dwarf, brown pygmy angelfish, dusky angelfish, dusky cherub, many-spined angelfish, and multispined angelfish, is a species of marine ray finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in tropical waters of the Indo-Pacific area.
Chaetodon guentheri, Günther's butterflyfish or the crochet butterflyfish, is a species of marine ray-finned fish, a butterflyfish belonging to the family Chaetodontidae. It is native to The western Pacific Ocean.
Centropyge nox, known commonly as the midnight angelfish or dusky angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the Western Pacific Ocean.
Genicanthus melanospilos, the spotbreast angelfish, blackspot angelfish or swallowtail angelfish, the family Pomacanthidae. It occurs in the Indo-West Pacific region.
Hemitaurichthys thompsoni, Thompson's butterflyfish, is a species of marine ray-finned fish, a butterflyfish belonging to the family Chaetodontidae. It is found in the Pacific Ocean.
The brownburnie, also known as Blackburn's butterflyfish or the rayed butterflyfish, is a species of marine ray-finned fish, a butterflyfish belonging to the family Chaetodontidae. It is found in the western Indian Ocean.
Genicanthus takeuchii, the spotted angelfish or Takeuchi’s angelfish, is a species of marine ray-finned fish, a marine angelfish belonging to the family Pomacanthidae. It is found in the northwestern Pacific Ocean
