Tuesday 18 June
Anguila ciega (Ophisternon infernale)
Anguila ciega fact file
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Anguila ciega description
Like many cave-dwelling species, the Anguila ciega (Ophisternon infernale), otherwise known as the blind swamp eel, has lost its eyes and pigmentation, which are of no use in the dark depths of a cave (3). Instead, this fish has a large number of sensitive pores on its long, bulb-shaped head to detect environmental stimuli (2) (3). This is a very elongate fish with an exceptionally long tail, giving it a somewhat worm-like appearance (2).
- Also known as
- Blind swamp eel.
- Anguila Ciega.
- Length: up to at least 32.5 cm (2)
Anchialine Caves and Cave Fauna of the World:
- An underground layer of rock and sand that contains water.
- Method of reproduction in which eggs are laid and embryos develop outside of the mother’s body.
- Saline waters
- Containing salt.
IUCN Red List (January, 2007)
Anchialine Caves and Cave Fauna of the World (January, 2007)
- Romero, A. (2009) Cave Biology: Life in Darkness, Cambridge University Press, UK.
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Anguila ciega biology
The Anguila ciega builds mucus-lined burrows in organic rich sediments within the freshwater part of the aquifer. This species is able to tolerate low oxygen concentration levels and can even breathe atmospheric oxygen. The diet is thought to primarily comprise stygobitic shrimp (Creaseria morleyi), and reproduction is reportedly oviparous, or egg-laying (2).Top
Anguila ciega range
The Anguila ciega occurs in central and northern Yucatan peninsula, Mexico (3).Top
Anguila ciega habitat
The Anguila ciega is found in freshwater limestone caves and sinkholes (2).Top
Anguila ciega status
The Anguila ciega is classified as Endangered (EN) on the IUCN Red List (1).Top
Anguila ciega threats
The main threats to this species are various forms of water pollution caused by humans. In rural areas sewage is rarely treated before being discarded, and industrial and domestic waste is sometimes disposed of in caves. Another threat comes from over-harvesting of freshwater, which may lead to saline waters creeping into the normally freshwater zone. The human population of the Yucatan peninsula is growing, so a greater and greater strain on water resources can be expected in the future. Another potential threat is the modification and/or the intensive use of this fish’s habitat by humans for recreational or tourism purposes (2).Top
Anguila ciega conservation
There are currently no conservation measures targeting the Anguila ciega.Top
Find out more
For more information on the Anguila ciega:
This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
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