email a friend
printable version
CR
Madagascar Fish-eagle Haliaeetus vociferoides
BirdLife Species Champion Become a BirdLife Preventing Extinctions Programme Supporter
For information about BirdLife Species Champions and Species Guardians visit the BirdLife Preventing Extinctions Programme.

Justification
This species has an extremely small population which is probably in decline, and it is therefore classified as Critically Endangered. Although the species is susceptible to a number of on-going threats, recent data have suggested that its population is stable, and may have been for some time; if this is confirmed, the species may warrant downlisting in the future.

Taxonomic source(s)
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

Identification
70-80 cm. Large fish-eagle. Dark reddish-brown back and underparts (latter streaked rufous), dark brown cap, whitish cheeks and throat. Dark brown wings, rather short white tail. Juvenile streaked on head, with pale fringes to flight feathers and paler underparts, and dark tail. Similar spp. Could only be confused with Madagascar Buzzard Buteo brachypterus or Madagascar Harrier-hawk Polyboroides radiatus, from which separated by white tail and cheeks in adult, and huge size, strong head and short tail of juvenile. Hints Much the largest raptor in Madagascar. Hunts near or over water, often perches for long periods on tall trees.

Distribution and population
This species survives in low numbers along the west coast of Madagascar. Surveys during 1991-1995 recorded at least 222 adults and 99 breeding pairs from 105 sites, apparently concentrated into three main regions: the Antsalova region west of Bemaraha Reserve, along the Tsiribihina River, and the coast from Mahajamba Bay to the island of Nosy Hara (Rabarisoa et al. 1997). Although this estimate is double an estimate from the period 1980-1985, this is probably due to more comprehensive surveying, and a decline in some areas was still recorded (Rabarisoa et al. 1997). Recent surveys suggest that the Antsalova district is the main stronghold, with 12 pairs in the Manambolomaty complex and a further 15 pairs elsewhere in the district in 2008 (L.-A. Réné de Roland in litt. 2008), and the population is currently thought to comprise c.120 breeding pairs (R. Watson in litt. 2010). Immature birds wander widely, making the non-breeding population difficult to assess (Langrand 1990, Rabarisoa et al. 1997).

Population justification
The current population is thought to be around 120 breeding pairs, equating to 240 mature individuals and roughly 360 individuals in total (R. Watson in litt. 2010).

Trend justification
Recent evidence has suggested that the population is stable, and may have been stable for some time (Johnson et al. 2009, R. Watson in litt. 2010). However, the southern portion of the species's range appears to have contracted and it has disappeared from the SW coast since 2005/2006 (L.-A. Rene de Roland in litt. 2011, Safford and Hawkins 2013). These observations add weight to the suspicion that the species's population is negatively affected by the on-going threats of habitat conversion and persecution. On this basis it is suspected to be undergoing a moderate decline.


Ecology
The species is found predominantly in wooded areas adjacent to waterbodies (Rabarisoa et al. 1997). It favours sites with large trees by the shoreline suitable for perching (Berkelman 1997), and feeds mainly on fish (Langrand 1990, Berkelman et al. 1999a,b), with the majority of prey in one study comprising two species of non-native tilapia (Berkelman 1997). Breeding pairs are territorial (May-October) (Rabarisoa et al. 1997), and nest in a large tree or rock cliff. Annual productivity is low (0.15 young fledged per territory [Watson et al. 1999]) because clutch-size is only one or two (three recorded at one nest in 2005) and only one chick is raised, due to siblicide (Watson 1998, Watson et al. 1999); and in one third of breeding attempts no eggs are laid (Watson et al. 1999).

Threats
Deforestation, soil erosion and the development of wetland areas for rice-paddies is causing the on-going loss of nesting and foraging habitat (Rabarisoa et al. 1997, Berkelman et al. 1999a, Watson and Rabarisoa 2000, L.-A. Réné de Roland in litt. 2011, Safford and Hawkins 2013). The species is threatened by direct human competition for fish-stocks (Watson 1998, Watson and Rabarisoa 2000), persecution through the taking of nestlings and shooting of adults, accidental entanglement in fishing-nets, disturbance at breeding sites by human activities and, according to local people, use of eagle body parts in food and traditional medicine (Rabarisoa et al. 1997, H. R. Ratsimba in litt. 2006, Safford and Hawkins 2013). Water pollution poses a potential threat (H. R. Ratsimba in litt. 2006), given the species's reliance on fish and the tendency for pollutants to accumulate in prey tissues. The species has been recorded to have low genetic diversity compared to other Haliaeetus species; however, this is not thought to be because of the recent population bottleneck, hence it is not thought to be a major threat (Johnson et al. 2009).

Conservation Actions Underway
CITES Appendix II. Since 1991, the species has been studied in the Antsalova region, where an on-going conservation programme aims to increase the known breeding population to at least 250 pairs. Activities to reach such a target include the enforcement of existing traditional laws at the local community level, and in two cases through the release of captive-reared birds rescued from siblicide (Rabarisoa et al. 1997, Peregrine Fund 1998, Watson 1998), with the latter almost doubling the number of young fledged per nest in one study (Watson et al. 1999). Manambolomaty (the Three Lakes Complex), is a Ramsar Site and official protection was expected to be confirmed for the area in early 2009 (Peregrine Fund 2008); this site and surrounding area supported 28 territorial pairs in 2006. Persecution has been reduced at Soamalipo Lake through the establishment of a research camp by The Peregrine Fund in 1991, accompanied by community outreach activities, resulting in increased breeding productivity (Razafimanjato et al. 2007).
Conservation Actions Proposed
Monitor the population size and distribution to detect changes (Rabarisoa et al. 1997). Increase awareness within local communities in order to reduce persecution and protect habitat around nest sites (Rabarisoa et al. 1997). Manage the wild population to increase the population size and distribution in suitable habitat (Rabarisoa et al. 1997). Investigate the factors limiting the number of available breeding territories, survival rates of immatures and adults, and breeding productivity (Watson et al. 1999).  Consider establishing a captive breeding population.


References
Anon. 2007. Madagascar project. Peregrine Fund Annual Report 2006: 28-30.

Berkelman, J.; Fraser, J. D.; Watson, R. T. 1999. Lake selection by Madgascar Fish-eagles. The Auk 116: 976-983.

Berkelman, J.; Fraser, J. D.; Watson, R. T. 1999. Madagascar Fish-eagle prey preference and foraging success. Wilson Bulletin 111: 15-21.

Berkelman. 1997. Habitat requirements and foraging ecology of the Madagascar Fish-eagle. PhD, Virginia Polytechnic Institute & State University.

Collar, N. J.; Butchart, S. H. M. 2013. Conservation breeding and avian diversity: chances and challenges. International Zoo Yearbook.

Collar, N. J.; Stuart, S. N. 1985. Threatened birds of Africa and related islands: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, and International Union for Conservation of Nature and Natural Resources, Cambridge, U.K.

Johnson, J. A.; Tingay, R. E.; Culver, M.; Hailer, F.; Clarke, M. L.; Mindell, D. P. 2009. Long-term survival despite low genetic diversity in the critically endangered Madagascar Fish-eagle. Molecular Ecology 18: 54-63.

Langrand, O. 1990. Guide to the birds of Madagascar. Yale University Press, New Haven, USA.

Peregrine Fund. 1998. Peregrine Fund Annual Report 1998.

Peregrine Fund. 2008. Designation will protect rare species in Madagascar. Available at: #http://www.peregrinefund.org/press_full.asp?id=146&category=Madagascar Project#.

Rabarisoa, R.; Watson, R. T.; Thorstrom, R.; Berkelman, J. 1997. Status of the Madagascar Fish-eagle Haliaeetus vociferoides in 1995. Ostrich 68: 8-12.

Razafimanjato, G.; Sam, T. S.; Thorstrom, R. 2007. Waterbird monitoring in the Antsalova region, Western Madagascar. Waterbirds 30(3): 441-447.

Safford, R. J.; Hawkins, A. F. A. 2013. The Birds of Africa. Volume VIII: The Malagasy Region. Christopher Helm, London.

Watson, R. 1998. The plight of the fish eagle: people, eagles and wetlands' conservation in Madagascar. Africa - Birds & Birding 3(4): 34-41.

Watson, R. T.; Rabarisoa, R. 2000. Sakalava fishermen and Madagascar Fish Eagles: enhancing traditional conservation rules to control resource abuse that threatenes a key breeding area for an endangered eagle. Ostrich 71(1 & 2): 2-10.

Watson, R. T.; Razafindramanana, S.; Thorstrom, R.; Rafanomezantsoa, S. 1999. Breeding biology, extra-pair birds, productivity, siblicide and conservation of the Madagascar fish eagle. Ostrich 70: 105-111.

ZICOMA. 1999. Zones d'Importance pour la Conservation des Oiseaux a Madagascar.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Bird, J., Butchart, S., Calvert, R., Ekstrom, J., Evans, M., Shutes, S., Starkey, M., Symes, A., Taylor, J. & Martin, R

Contributors
Ratsimba, H., Réné De Roland, L., Safford, R. & Watson, R.

Recommended citation
BirdLife International (2014) Species factsheet: Haliaeetus vociferoides. Downloaded from http://www.birdlife.org on 28/07/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/07/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Madagascar fish-eagle (Haliaeetus vociferoides) 0

Key facts
Current IUCN Red List category Critically Endangered
Family Accipitridae (Hawks, Eagles)
Species name author Des Murs, 1845
Population size 240 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 40,700 km2
Country endemic? Yes
Links to further information
- Additional Information on this species