Heteroconger

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Heteroconger
Spotted garden eels at the Seattle Aquarium.jpg
Spotted garden eels, Heteroconger hassi
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Anguilliformes
Family: Congridae
Subfamily: Heterocongrinae
Genus: Heteroconger
Bleeker, 1868
Type species
Heteroconger polyzona
Bleeker, 1868
Species

See text

Heteroconger is a genus of marine congrid eels. These small, slender garden eels live in groups where each individual has its own burrow. Usually, only the head and front half of the body is visible. The greatest species richness is in the Indo-Pacific, but species are also found in the warmer parts of the Atlantic (including the Caribbean) and the eastern Pacific. Its name relates to how a huge colony of the eels looks swaying in the current.

The garden eel is roughly 40 cm (16 in) long. The eel has large eyes compared to its body, and a weak sense of smell because of its tiny nostrils. It is timid around other animals and people, but slightly aggressive towards other males of its species. If it feels threatened, it retreats into its burrow and closes it with a mucus block so the predator cannot dig into its home. It has a gland in its tail that secretes a sticky substance that keeps the burrow from falling in on itself and burying the garden eel in sand. Scientists have yet to figure out the garden eel's lifespan in the wild.

The garden eel is a carnivore, and eats plankton. Because of its large eyes, it relies mostly on sight to find its food. It catches the plankton by staying in its burrow and swaying its head about to catch the plankton drifting by in the current.

Garden eels are sexual reproducers and sexually dimorphic. In the mating season, the eels move their burrows closer together, until they are within reaching distance. Then, the male picks which female he wants to mate and defends her viciously, biting at the head and even the eyes of any other suitors. The couple mates and the female releases the fertilized eggs, letting them float away and gather around the epipelagic zone. The garden eels develop and hatch out of their eggs while floating in the water and, when they are large enough, swim down to a sand bed and dig a burrow of their own.

One of its top predators, the Pacific snake eel, Ophicthus triserialis, burrows into the sand near a colony, then digs under a garden eel's burrow and grabs its tail. This all happens under the substrate, where the unsuspecting garden eel cannot see what is happening. Trigger fish scare the garden eels into retreating into their burrows, then dig them up and devour them.

Species

The currently recognized species in this genus are: [1]

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The whitespotted garden eel, also known as the Indian spaghetti eel, is an eel in the family Congridae. It was described by Wolfgang Klausewitz and Irenäus Eibl-Eibesfeldt in 1959. It is a marine, tropical eel which is known from the Indo-Western Pacific, including Maldives, the Solomon Islands, the Philippines, the Cocos Islands, Comoros, India, Indonesia, and Papua New Guinea. It dwells at a depth range of 25 to 48 metres, and lives in non-migratory colonies that form burrows on sandy slopes, usually near coral reefs. Males can reach a maximum total length of 70 centimetres (28 in).

Heteroconger balteatus is an eel in the family Congridae. It was described by Peter Henry John Castle and John Ernest Randall in 1999. It is a marine, tropical eel which is known from Saudi Arabia and the Red Sea, in the western Indian Ocean. It is known to dwell at a minimum depth of 46 m (151 ft), and inhabits regions of current, where it forms burrows in sand. It enters its burrows tail-first. Females can reach a maximum total length of 33.1 cm.

The white-ring garden eel, also known as the Cape garden eel in Mexico, is an eel in the family Congridae. It was described by Garry I. McTaggart-Cowan and Richard Heinrich Rosenblatt in 1974, originally under the genus Taenioconger. It is a marine, tropical eel which is known from the Gulf of California, in the eastern central Pacific Ocean. It is known to dwell at a depth of 20 m (66 ft), and inhabits sand sediments near reefs, where it forms burrows in nonmigratory colonies. Males can reach a maximum total length of 80 cm.

<span class="mw-page-title-main">Enigma garden eel</span> Species of fish

The enigma garden eel is a species of eel in the conger/garden eel family Congridae.

The Galapagos garden eel is an eel in the family Congridae. It was described by Irenäus Eibl-Eibesfeldt and Friedmann Köster in 1983, originally under the genus Taenioconger. It is a marine, tropical eel which is known from the eastern central and southeastern Pacific Ocean, including Colombia, Costa Rica, the Galapagos Islands in Ecuador, and Panama. It dwells at a depth of 10 to 30 m, and lives in large, nonmigratory colonies in clean, sandy substrates. Males can reach a maximum total length of 70 cm.

Heteroconger obscurus, the obscure garden eel, is an eel in the family Congridae. It was described by Wolfgang Klausewitz and Irenäus Eibl-Eibesfeldt in 1959, originally under the genus Xarifania. It is a marine, tropical eel which is known from the eastern Indian Ocean, including the Nicobar Islands in India, and Andaman Island. It is known to dwell at a maximum depth of 15 m (49 ft), and inhabits silty sediments. Males can reach a maximum total length of 33.6 cm.

The black garden eel is an eel in the family Congridae. It was described by James Erwin Böhlke and John Ernest Randall in 1981. It is a tropical, nonmigratory marine eel which is known from the western Pacific Ocean, including Ambon, Indonesia, and Negros, Philippines. It dwells at a depth range of 1–35 m. It leads a benthic lifestyle, and inhabits sand or mud, living solitary or in colonies. Males can reach a maximum total length of 53.7 cm.

<span class="mw-page-title-main">Zebra garden eel</span> Species of fish

The zebra garden eel, also known as the banded garden eel, is a species of eel in the conger/garden eels family Congridae. It was described by Pieter Bleeker in 1868. It is a marine, tropical eel which is known from the Indo-Western Pacific, including the Philippines, the Ryukyu Islands, New Guinea, Indonesia and Vanuatu. It inhabits shallow waters at a depth range of 1 to 10 m, and forms burrows in colonies of moderate size on sand sediments in bays, slopes and reefs. Males can reach a maximum total length of 34.7 cm.

<span class="mw-page-title-main">Taylor's garden eel</span> Species of fish

Taylor's garden-eel is a heteroconger belonging to the family Congridae. It is native to the central Indo-Pacific.

Heteroconger tomberua is an eel in the family Congridae. It was described by Peter Henry John Castle and John Ernest Randall in 1995. It is a marine, tropical eel which is known from the western central Pacific Ocean, including Fiji and possibly New Caledonia, the Philippines, the Nicobar Islands, Papua New Guinea, and Sri Lanka. It is known to dwell at a depth of 36 m (118 ft). Males can reach a maximum total length of 42.8 cm.

Tricia's garden eel is an eel in the family Congridae. It was described by Peter Henry John Castle and John Ernest Randall in 1999. It is a marine, tropical eel which is known from Flores, Indonesia, in the eastern Indian Ocean. Males can reach a maximum total length of 49.6 cm (19.5 in).

References

  1. Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Heteroconger in FishBase . December 2012 version.