Bedotia geayi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Atheriniformes Bedotiidae

Scientific Name: Bedotia geayi Pellegrin, 1907
Common Name(s):
English Zona

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii,iv,v) ver 3.1
Year Published: 2016
Date Assessed: 2016-06-21
Assessor(s): Ravelomanana, T., Sparks, J.S. & Loiselle, P.V.
Reviewer(s): Randrianizahaisa, H., Rasoloariniaina, R & Velosoa, J.
Contributor(s): Participants of the CBSG/ANGAP CAMP "Faune de Madagascar" workshop, Mantasoa, Madagascar 2001
Facilitator/Compiler(s): Darwall, W.R.T.
Known only from the Mananjary drainage. Its presence in rivers to the north remains a possibility but needs confirmation. In the adjacent Namorona drainage the species is replaced by Bedotia sp. Ranomafana. Habitat degradation and pressure from exotic predators (Gambusia holbrooki) and competitors (Xiphophorus spp.) have largely eliminated B. geayi from low altitude (< 100 m a.s.l) habitats, however, it remains abundant in the middle and upper reaches of the Mananjary. Pending major shifts in land use in the basin, this species is assessed as Endangered on the basis of its Extent of Occurrence being less than 5000 km², with a continuing decline in distribution due to the above mentioned pressures.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Bedotia geyai is endemic to Madagascar. It is known from the Mananjary river (Loiselle and Rodriguez 2007).
Countries occurrence:
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:1928
Continuing decline in extent of occurrence (EOO):Yes
Number of Locations:1Continuing decline in number of locations:Yes
Lower elevation limit (metres):300
Upper elevation limit (metres):650
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species was not difficult to find along the river followed by the national road N°25 near Kianjavato (Ravelomanana, pers obs).
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Bedotia geayi inhabits small streams flowing under partial or complete forest cover (Loiselle and Rodriguez, 2007).
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: There is no use or trade information available for this species.

Threats [top]

Major Threat(s): This species has not been collected from low altitude habitats in the Mananjary basin for some time. This is may be due to the fact that the immediate hinterland of the town of Mananjary has undergone extensive anthropogenic modification. This process favours exotic species, which are better adapted to deal with increased silt loads and higher water temperatures that follow deforestation than are the majority of Madagascar’s native fishes (Loiselle and Rodriguez, 2007).

Conservation Actions [top]

Conservation Actions: Probably a part of the population is included in the protected area "Fandriana - Vondrozo corridor".

Citation: Ravelomanana, T., Sparks, J.S. & Loiselle, P.V. 2016. Bedotia geayi. The IUCN Red List of Threatened Species 2016: e.T2719A58293954. . Downloaded on 18 September 2018.
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