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Pachypanchax sakaramyi 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cyprinodontiformes Aplocheilidae

Scientific Name: Pachypanchax sakaramyi
Species Authority: (Holly, 1928)

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2016
Date Assessed: 2016-06-30
Assessor(s): Sparks, J.S.
Reviewer(s): Randrianizahaisa, H., Rasoloariniaina, R, Ravelomanana, T., Velosoa, J. & Raminosoa, N.
Contributor(s): Participants of the CBSG/ANGAP CAMP "Faune de Madagascar" workshop, Mantasoa, Madagascar 2001 & Loiselle, P.V.
Facilitator/Compiler(s): Darwall, W.R.T.
Justification:
Pachypanchax sakaramyi was most recently listed as Critically Endangered.

A visit to Joffreville in 2001 revealed that the upper reaches of the Sakaramy River has been effectively de-watered by diversion of the river’s headwaters, for domestic use by local residents. This last riverine subpopulation of P. sakaramyi exists only as a few fish surviving in puddles fed by the leaking water pipe. More recent survey in 2009 (T. Ravelomanana pers. comm. 2016) confirmed there to be no subpopulation in the Sakaramy River but there was a subpopulation found in Antsakoabe River. This species is reputed to occur in Lac Texier and one other low altitude crater lake, both of which are located inside the boundaries of Montagne d’Ambre National Park. However, these habitats have not been sampled since the late 1950s and nothing is known of the current status of these subpopulations.

In light of these observations, with an estimated extent of occurrence (EOO) of 550 km2, a single location and an ongoing decline in habitat, this species is now assessed as Endangered.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to Madagascar. This species is only recorded from few localities in the extreme north of Madagascar: Sakaramy river, Irodo river and Lake Texier. More recently it has been found in the Antsakoabe River (T. Ravelomanana pers. comm. 2016).
Countries occurrence:
Native:
Madagascar
Additional data:
Number of Locations:1-4,1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The subpopulations are very fragmented. Several streams crossed by the national road from Antsakoabe village to Diego Suarez were sampled and Pachypanchax were not found.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:Unknown

Habitat and Ecology [top]

Habitat and Ecology:

According to Loiselle (2006), Pachypanchax sakaramyi inhabits high-gradient streams flowing under both degraded and intact forest cover and the peripheral waters of low-altitude crater lakes. Individuals of all sizes occur in both areas of strong current and tranquil pools, but are most abundant in the latter. Water temperatures between 20.5-22.2°C were measured in partially shaded segments of the Sakaramy River in October. The water of the Sakaramy River and other streams draining the Ambohitra Massif is free of suspended matter, unstained by tannins, moderately soft (total and carbonate hardness 36.0–72.0 ppm), slightly alkaline (pH 7.2–7.5) and deficient in dissolved substances ( conductivity 58.0–75.0 μS/cm²).

Systems:Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: There is no use or trade information.

Threats [top]

Major Threat(s):

According to Loiselle (2006), Pachypanchax sakaramyi has been extirpated from most of its original range since its description in 1928. Local residents ascribe its disappearance to predation by introduced Poecilia reticulata and Gambusia holbrooki upon P. sakaramyi fry. A factor of equal importance is ongoing deforestation of the Ambohitra Massif, which changes the hydrological regime of small streams from permanent to intermittent, resulting in the extirpation of their subpopulations of P. sakaramyi. The most recent loss of habitat was occasioned by the diversion of the source of the Sakaramy River in 2000 to provide drinking water for several private residences and the guesthouse of the Benedictine monastery located on the outskirts of Ambohitra.

Conservation Actions [top]

Conservation Actions: This species is reputed to occur in Lac Texier and one other low altitude crater lake, both of which are located inside the boundaries of Montagne d’Ambre National Park. However, these habitats have not been sampled since the late 1950s and nothing is known of the current status of these subpopulations.

Citation: Sparks, J.S. 2016. Pachypanchax sakaramyi. The IUCN Red List of Threatened Species 2016: e.T15839A58297043. . Downloaded on 16 January 2017.
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