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Anguilla rostrata

(Freshwater Eel)

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Catalan:

Anguila

Common Names in Czech:

Úhor Americký, Úhoř Americký, hor Americk

Common Names in Danish:

Amerikansk ål, Amerikansk Ferskvandsål, Amerikansk Ferskvandsl, Amerikansk l

Common Names in Dutch:

Aal, Amerikaanse Aal, Amerikaanse Aal;amerikaanse Paling, Amerikaanse Paling, Paling

Common Names in English:

American Eel, Common Eel, Eel, Elver (Joven), Freshwater Eel, Silver Eel

Common Names in Finnish:

Amerikanankerias

Common Names in French:

Anguille, Anguille Américaine, Anguille Amricaine, Anguille Congre, Anguille D'amèrique, Anguille D'amérique, Anguille D'amrique, Anguille D?amérique

Common Names in German:

Aal, Amerikanischer Aal

Common Names in Italian:

Anguilla Americana

Common Names in Mandarin Chinese:

美洲鰻鱺, 美洲鰻鱺, 美洲鳗鲡

Common Names in Polish:

Moringa Cetkowana, Wegorz Amerykanski

Common Names in Portuguese:

Enguia, Enguia Americana, Enguia-Americana

Common Names in Russian:

угорь американский, Amerikanskiy Ugor´, Amerikanskiy Ugor', угорь американский

Common Names in Spanish:

Anguila, Anguila Amarilla, Anguila Americana

Common Names in Swedish:

Amerikansk l

Description

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Family Anguillidae

Usually catadromous fishes in tropical and temperate waters , except eastern Pacific and south Atlantic. Eellike body with minute or embedded scales . Well developed pectorals but no pelvic fins; dorsal and caudal fin confluent with anal fin. All species are important food fishes and are sold fresh, smoked, or canned. Important aquaculture species based on captured juveniles (elvers ); widely introduced . All spend their juvenile and adult live in freshwater , returning to the ocean to spawn and die. The leptocephalus larvae are marine . There is some doubt as to the validity of some of the fifteen species currently recognized.The family Anguillidae belongs to the Class Actinopterygii (ray-finned fishes) and the Order Anguilliformes. It contains 1 genus and 15 species. It may be found in Marine, Brackish , and Freshwater environments and is primarily Marine. Members of this family are not used in the aquarium trade. Reproductively, most members of this family are nonguarders. The main mode of swimming of adult fish in this family is anguilliform . Compared with other fish, the activity level of this family tends to be normal. Members of this family have been dated back to the upper Miocene epoch of the Tertiary period. This family may be found from 70° n to 48° s and 107° w to 178° e. Etymology of this family name : Latin, anguilla, ae = eel

Physical Description

Species Anguilla rostrata

Body: Mouth and Snout: The mouth is terminal and fairly large. Eels have jaws with teeth. No barbels . Body Pattern : The body and fins are solid dark brown or dark olive with no patterning on back grading to a dull yellow, cream or white on belly. Cycloid scales are extremely tiny and numerous . Body Shape : Elongate , flexible , snake-like body. In Wisconsin waters, typically 350-1000 mm TL , with a maximum size of 1100 mm (3 feet).

Fins: Tail rounded and continuous with long (greater than half the body length ) single dorsal and anal fins that lack spines. There are no pelvic fins. No adipose fin .

Distinguishing characteristics: The eel has a long, flexible body and no pelvic fins. It also has a terminal mouth with teeth in jaws. No pelvic fins, dorsal and anal fins long (longest ray much shorter than length of fin base ) and continuous with caudal fin. Single small gill slit at base of pectoral fin, and body covered with small, inconspicuous, embedded scales . Distinctive Features: Elongate, flexible, snake-like body. See also similar species information.

Breeding Adults : The appearance of breeding fish is similar to nonbreeding adults. This species spawns in the ocean. Only females are found in Wisconsin; males remain in the lower reaches of coastal tributaries. The body color is more silver or gray during migration to the ocean, but this silver eel form is not known with certainty from Wisconsin.

Juveniles : Juveniles exist in a larval form (leptocephalus) that is not found in Wisconsin. These fish spawn in the Sargasso Sea , which is east of Florida and the Bahamas, and make a 3,000 mile migration to Wisconsin via the Mississippi River or the Great Lakes . The larval form is transparent, shaped like a leaf, and never occurs in freshwaters .

Size/Age/Growth

Males are commonly 50 cm (Total Length) in length when caught/marketed, but may be as large as 152 cm (Total Length). May live as long as 43 years in the wild, 6 years in captivity.

Habitat

Occurs usually in permanent streams with continuous flow . Hides during the day in undercut banks and in deep pools near logs and boulders .

Typically found in water with a depth of -5,570 to 0 meters (-18,274 to 0 feet).[2]

Biome: Fresh water , brackish water, saltwater . Demersal .

Biology

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Diet

Feeds on larvae of Ephemeroptera, Odonata, Plecoptera, Coleoptera, Trichoptera, and Lepidoptera, as well as gastropods , oligochaetes, amphipods , isopods , mysids , and fish from the families Percidae, Cyprinidae, Ictaluridae, Catostomidae and Anguillidae[3].

Reproduction

After hatching the larvae are transparent and shaped like a willow leaf. They then metamorphose into a more recognizably eel-like juvenile form called glass eels .[1]

After migration they become pigmented . These eels are known as elvers . Its European cousin takes about three years to do this. Elvers reach our coastline when they are about two inches long, a year after hatching. Males seem to remain fairly close to the mainland, while females travel far inland when they are about two inches long, a year after hatching.[1]

Now in their yellow eel phase , the American eels will remain in the brackish and fresh waters of rivers for a few years.[1]

Before beginning its life-ending migrations, American eels turn to a blackish-bronze color, their eyes enlarge, they fatten and develop a thicker skin and their digestive tract degenerates . They are then silver eels - the last stage of their lives.[1]

Migration

Catadromous .[4]. Migrates in autumn to the Sargasso Sea to spawn [5].

Sound types : clucks, clicks, squeak, thumps. Sound organ: swim bladder, pneumatic duct , possibly teeth.

Taxonomy

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Unambiguous Synonyms

  1. Amphiodon alosoides (Rafinesque, 1819)
  2. Clupea alosoides Rafinesque, 1819
  3. Elattonistius chrysopsis (Richardson, 1836)
  4. Hiodon chrysopsis Richardson, 1836
  5. Hiodon clodalis Lesueur, 1818
  6. Hyodon alosoides (Rafinesque, 1819)
  7. Hyodon chrysopsis Richardson, 1836
  8. Muraena rostrata Lesueur, 1817

Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: Data last modified by FishBase 08-Mar-1994.

Similar Species

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Fish Name Body Shape Mouth/Teeth Pectoral Fin Gills Scales Similarity Index American Brook Lamprey elongated, but not snake-like Sucking disk or flexible filtering "hood" instead of jaws Absent Seven conspicuous circular gill openings No scales Slightly similar American Eel elongated, flexible, snake-like Terminal mouth with teeth in jaws Present Single small gill slit Small, inconspicuous, embedded scales N/A Chestnut Lamprey elongated, but not snake-like Sucking disk or flexible filtering "hood" instead of jaws Absent Seven conspicuous circular gill openings No scales Slightly similar Northern Brook Lamprey elongated, but not snake-like Sucking disk or flexible filtering "hood" instead of jaws Absent Seven conspicuous circular gill openings No scales Slightly similar Sea Lamprey elongated, but not snake-like Sucking disk or flexible filtering "hood" instead of jaws Absent Seven conspicuous circular gill openings No scales Slightly similar Silver Lamprey elongated, but not snake-like Sucking disk or flexible filtering "hood" instead of jaws Absent Seven conspicuous circular gill openings No scales Slightly similar Southern Brook Lamprey elongated, but not snake-like Sucking disk or flexible filtering "hood" instead of jaws Absent Seven conspicuous circular gill openings No scales Slightly similar

Members of the genus Anguilla

There are approximately 127 species in this genus. Here are just 100 of them:

A. acutirostris · A. altirostris · A. amblodon · A. amboinensis · A. anacamptoentera · A. aneitensis · A. anguilla (European Freshwater Eel) · A. anguilla macrocephala · A. anguilla ornithorhyncha · A. anguilla oxycephala · A. anguilla rostrata (Freshwater Eel) · A. angustidens · A. arracana · A. aterrima · A. aucklandii · A. australis (Australian Short-Finned Eel) · A. australis australis (Australian Short-Finned Eel) · A. australis occidentalis · A. australis schmidti · A. australis schmidtii · A. avisotis · A. bengalensis (African Mottled Eel) · A. bengalensis bengalensis (Indian Longfin Eel) · A. bengalensis labiata (African Mottled Eel) · A. bicolor (Indonesian Shortfin Eel) · A. bicolor bicolor (Indian Short-Finned Eel) · A. bicolor pacifica (Indian Short-Finned Eel) · A. blephura · A. borneensis · A. bostoniensis · A. breviceps · A. brevirostris · A. caeca · A. callensis · A. canariensis · A. cantori · A. capensis · A. capitone · A. celebesensis (Indonesian Mottled Eel) · A. chrisypa · A. chryspa · A. chrysypa · A. clathrata · A. cloacina · A. conger · A. cubana · A. cuvieri · A. delalandi · A. delalandii · A. dieffenbachii (New Zealand Longfin Eel) · A. elphinstonei · A. eurystoma · A. fasciata · A. fidjiensis · A. anguilla · A. guttata · A. hibernica · A. hildebrandti · A. interioris (Highlands Long-Finned Eel) · A. japonica (Freshwater Eel) · A. japonicus · A. johannae · A. kieneri · A. labiata · A. labrosa · A. laticauda · A. latirostris · A. leptocephali · A. lutea · A. macrophthalma · A. macrops · A. macroptera · A. malabarica · A. malgumora (Indonesian Longfinned Eel) · A. manabei · A. marginata · A. marginipinnis · A. anguilla · A. marmorata (Madagascar Mottled Eel) · A. bicolor subsp. bicolor · A. mediorostris · A. megastoma (Polynesian Longfinned Eel) · A. melanochir · A. microptera · A. migratoria · A. moa · A. morena · A. mossambica (African Longfin Eel) · A. mossambicus · A. mowa · A. myriaster · A. nebulosa (African Mottled Eel) · A. nebulosa elver · A. nebulosa labiata · A. nebulosa nebulosa (African Mottled Eel) · A. nigricans · A. nilotica · A. novaeterrae · A. oblongirostris · A. obscura (Pacific Shortfinned Freshwater Eel)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal December 09, 2007:

Identifiers

Footnotes

  1. New Mexico Wildlife. New Mexico Department of Game and Fish Version of April 24, 2009. [back]
  2. Mean = -396.450 meters (-1,300.689 feet), Standard Deviation = 1,289.210 based on 1,460 observations. Ocean depth information for each observation from British Oceanographic Data Centre. [back]
  3. Lookabaugh, P. S. and P. L. Angermeier (1992). Diel patterns of American eel, Anguill rostrata, in the James River Drainage, Virginia. J. Freshwat. Ecol. 7(4):425-431. [back]
  4. Smith, C.L. (1997). National Audubon Society field guide to tropical marine fishes of the Caribbean, the Gulf of Mexico, Florida, the Bahamas, and Bermuda. Alfred A. Knopf, Inc., New York. 720 p. [back]
  5. Wenner, C.A. (1978). Anguillidae. In W. Fischer (ed.) FAO species identification sheets for fishery purposes. West Atlantic (Fishing Area 31). volume 1. [pag. var.]. FAO, Rome. [back]
Last Revised: 2009-06-17