Astacoides madagascarensis 

Scope: Global

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Malacostraca Decapoda Parastacidae

Scientific Name: Astacoides madagascarensis
Species Authority: (Milne Edwards & Audouin, 1839)
Common Name(s):
English Madagascar Freshwater Crayfish
Astacoides madagascariensis (Milne Edwards & Audouin, 1839) [orth. error]
Taxonomic Notes: This species previously appeared on the IUCN Red List under the incorrect name of Astacoides madagascariensis. It has now been corrected to Astacoides madagascarensis. An updated Red List assessment has been created to reflect this change. Missing references were also added to the Bibliography.

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2016
Date Assessed: 2010-06-03
Assessor(s): Jones, J.P.G.
Reviewer(s): Collen, B. & Richman, N.
Contributor(s): Livingston, F., Soulsby, A.-M., Batchelor, A., Dyer, E., Whitton, F., Milligan, H.T., Smith, J., Lutz, M.L., De Silva, R., McGuinness, S., Kasthala, G., Jopling, B., Sullivan, K. & Cryer, G.
Astacoides madagascarensis has been assessed as Data Deficient. This species has possibly undergone declines in abundance due to habitat degradation and loss. It is likely to undergo further declines in the future due to introduced species. This species is likely to qualify for a threatened category, however there is no available estimate on the rate of population decline. Further research is needed to determine population decline before a more accurate assessment of conservation status can be made.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Astacoides madagascarensis is endemic to Madagascar, and extends a little further north than that of any other Malagasy crayfishes. The distribution of this species lies at latitudes 18° to 21° S, longitudes 47° to 49° E. Type specimens were probably collected in the vicinity of Tananarive (Hobbs 1987). This species is found in the Toamasina and Antananarivo provinces (Boyko et al. 2005). This species has an estimated extent of occurrence of 3,697 km2.
Countries occurrence:
Additional data:
Lower elevation limit (metres):500
Upper elevation limit (metres):2000
Range Map:Click here to open the map viewer and explore range.

Population [top]


Astacoides madagascarensis is a relatively common and species where it is found (J.P.G. Jones pers. comm. 2009).

Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:

Astacoides madagascarensis is widespread in lotic habitats in the eastern rainforests. It is very similar to A. granulimanus and essentially appears to fill the same niche as this common species but with a range shifted to the north (J.P.G. Jones pers. comm. 2009).


Use and Trade [top]

Use and Trade: This species is harvested throughout its range.

Threats [top]

Major Threat(s): In common with other similar species in the genus (Jones et al. 2007), habitat loss due to the conversion of forest to agricultural land is likely to threaten Astacoides madagascarensis (J.P.G. Jones pers. comm. 2009). This species is also heavily harvested throughout its range. Although no studies have looked specifically at the sustainability of this harvest, the species is very similar to A. granulimanus which suggests the harvest may be sustainable under current conditions (Jones et al. 2005).

Introduced fish species, such as the Asian Snakehead (Channa maculata) represent a new and growing threat (Jones et al. 2007). Crayfish from the genus Procambarus have recently been found within the vicinity of the Malagasy capital, Antananarivo (Jones et al. 2009) though the true distribution may in fact extend further. There is concern that Procambarus may eventually out compete native Astacoides species due to higher fecundity and growth rates or may act as a vector for crayfish plague (Jones et al. 2009).

Conservation Actions [top]

Conservation Actions: There are no species-specific conservation measures in place for Astacoides madagascarensis, however there is a national law preventing the harvesting of crayfish under 10 cm total length. Local rules and taboos govern harvesting in some areas (Jones et al. 2008).

Further research is needed on the population trends of this species.

Classifications [top]

5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
  Harvest management plan:Yes
In-Place Education
2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.4. Scale Unknown/Unrecorded
♦ timing:Ongoing ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.1. Intentional use: (subsistence/small scale) [harvest]
♦ timing:Ongoing ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.2. Named species [ Channa maculata ]
♦ timing:Ongoing ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.2. Named species
♦ timing:Ongoing ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.2. Competition

1. Research -> 1.2. Population size, distribution & trends

Bibliography [top]

Boyko, C.B, Ravoahangimalala, O.R., Randriamasimanana, D. and Razafindrazaka, T.H. 2005. Astacoides hobbsi, a new crayfish (Crustacea: Decapoda: Parastacidae) from Madagascar. Zootaxa 1091(41-51).

Fetzner, J.W. 2008. Crayfish Taxonomy Browser. Available at: (Accessed: June).

Hobbs, H.H.Jr. 1987. A Review of the Crayfish Genus Astacoides (Decapoda: Parastacidae). Smithsonian Contributions to Zoology 443: 50.

IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-1. Available at: (Accessed: 30 June 2016).

Jones, J.P.G., Andriahajaina, F.B., Hockley, N.J., Balmford, A.P. and Ravoahangimalala, O.R. 2005. A multidisciplinary approach to assessing the sustainability of freshwater crayfish harvesting in Madagascar. Conservation Biology 19: 1863-1871.

Jones, J.P.G., Andriahajaina, F.B., Hockley, N.J., Crandall, K.A. and Ravoahangimalala, O.R. 2007. The ecology and conservation status of Madagascar's endemic freshwater crayfish (Parastacidae; Astacoides). Freshwater Biology 52: 1820-1833.

Jones, J.P.G., Andriahajaina, F.B., Ranambinintsoa, E.H., Hockley, N.J. and Ravoahangimalala, O. 2006. The economic importance of freshwater crayfish harvesting in Madagascar and the potential of community-based conservation to improve management. Oryx 40: 168-175.

Jones, J.P.G., Andriamarovololona, M.A. and Hockley, N.J. 2008. The role of taboos and social norms in conservation in Madagascar. Conservation Biology 22(976-986).

Jones, J.P.G., Rasamy, J.R., Harvey, A., Toon, A., Oidtmann, B., Randrianarison, M.H., Raminosoa, N. and Ravoahangimalala, O.R. 2009. The perfect invader: a parthenogenic crayfish poses a new threat to Madagascar's frehswater biodiversity. Biological Invasions 11: 1475-1482.

Citation: Jones, J.P.G. 2016. Astacoides madagascarensis. The IUCN Red List of Threatened Species 2016: e.T2183A96472022. . Downloaded on 05 December 2016.
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