Overview

Distribution

Range Description

This species is known from the Lower São Francisco River basin in Brazil but not below the great dam of Sobradinho.
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South America: São Francisco River basin in Brazil.
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São Francisco River basin, Brazil.
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Physical Description

Size

Max. size

33.0 cm SL (male/unsexed; (Ref. 38504))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
B. orthotaenia is a benthopelagic (ecological region at the lowest level of the 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).

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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Diseases and Parasites

Procamallanus Infection 10. Parasitic infestations (protozoa, worms, etc.)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Brycon orthotaenia

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 5
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
A2cd

Version
3.1

Year Assessed
2009

Assessor/s
Reis, R & Lima, F.

Reviewer/s
Collen, B., Darwall, W., Ram, M. & Smith, K. (SRLI Freshwater Fish Evaluation Workshop)

Contributor/s

Justification
Assessed as Vulnerable due to an inferred population reduction of greater than 30% over the last 10 years, based on a decline in habitat quality, fisheries catches and forest cover. In addition, there are reports of some populations being close to extinction. There is no evidence that the threats which B. orthotaenia faces will cease in the near future, and therefore it is suspected that population declines will continue.
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Population

Population
The global population is decreasing, although detailed information is not yet available.

Population Trend
Decreasing
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Threats

Major Threats
It is suspected that the species has declined considerably over the past several decades in the São Francisco basin. It is likely that due to damming over the lowest portion of the region it is no longer present.

Human population growth and an increase in agricultural and industrial activities, as well as dam construction, mineral extraction, deforestation and predatory fishing have caused environment degradation in the São Francisco river. It was one of the main fishing resources in Brazil, but the fisheries are presently experiencing a decline. Taking this into consideration, B. orthotaenia, which is an important species for commercial fishing, is threatened with extinction in some regions of the São Francisco basin (Gonçalves et al. 2006).

Due to their dependence on plant material in their diet, the destruction of rainforests surrounding their habitat could have serious consequences for this species. The São Francisco basin has lost 64.4% of its original forest (based on an estimate of the extent of closed canopy forest in existence 8,000 years ago in the absence of human impact), and the basin is now primarily cropland (Water Resources eAtlas 2005).
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Vulnerable (VU) (A2cd)
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Management

Conservation Actions

Conservation Actions
There are no conservation actions in place at present, and a population monitoring programme is urgently needed to better understand the threats and numbers remaining, with a recovery programme in mind.
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