|Scientific Name:||Brycon polylepis|
|Species Authority:||Mosco Morales, 1988|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor/s:||Reis, R & Lima, F.|
|Reviewer/s:||Collen, B., Darwall, W., Ram, M. & Smith, K. (SRLI Freshwater Fish Evaluation Workshop)|
Assessed as Least Concern. While the species is of concern in the Maracaibo basin, it is still present in the Orinoco basin and Western Amazon where populations are not under threat. In the Tocantin basin, it is likely less common, but on balance across it range, it is not thought that the species is threatened. If current rates of degradation of habitat continue to occur in Maracaibo and Tocantin, and start to occur in Orinoco and the Western Amazon, then the species will need to be moved to a threatened category.
|Range Description:||B. polylepis is found in Lake Maracaibo. This species was also recorded for the Orinoco basin in Venezuela, in the Rio Tocantins basin in Brazil and in the upper Amazon basin (Rio Madre de Dios) in Peru (Lima 2004; Lima in prep.)|
Native:Brazil; Peru; Venezuela, Bolivarian Republic of
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Nowhere throughout its range is this species common.|
|Habitat and Ecology:||B. polylepis is a benthopelagic (ecological region at the lowest level of water body) species. Plant material is an important part of the diet of adult Brycon species; and thus these fish play a role in the dispersal of plants whose fruits they eat (Berra 2001). Occurs only in small rivers. Specimens have been found in caves.|
This species is very sensitive to disturbance. They are generally the first species to disappear when disturbance occurs. There is very little natural habitat remaining in the Lake Maracaibo basin due to a high population density and intensive land use. Grazing has especially affected the southeastern and southwestern areas of Lake Maracaibo. The main impact on the natural vegetation has been caused by shifting cultivation, and by an extensive network of roads surrounding Lake Maracaibo. Further conversion of remaining natural habitat in the southern part of the basin is of great concern. Also of concern is recent findings that some of the rivers that traverse the basin and flow into the Maracaibo Lake are polluted with pesticides and fertilizers (WWF 2001). Due to their dependence on plant material in their diet, the destruction of rainforests surrounding their habitat could have serious consequences for this species.
While the species is of concern in the Maracaibo basin, it is still present in the Orinoco basin and Western Amazon where populations are not under threat. In the Tocantin basin, it is likely less common, but on balance across it range, it is not thought that the species is threatened.
|Conservation Actions:||There are no conservation measures in place.|
|Citation:||Reis, R & Lima, F. 2009. Brycon polylepis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.|
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