Grey-Headed Fish Eagle
Also known as: Haliaeetus ichthyaetus (scientific name) · Ichthyophaga ichthyaetus (former generic placement)
Definition
The Grey-Headed Fish Eagle (Haliaeetus ichthyaetus) is a fish-eating bird of prey of Southeast Asia, including the Philippines, where it haunts rivers, lakes, reservoirs, and coastal wetlands. A large, stocky raptor, the adult has a dark brown body, pale grey head, lighter underbelly, and white legs, while juveniles are paler. It hunts by swooping from waterside perches to snatch fish near the surface, and wetland degradation across its range has put the species under increasing pressure. (Wikipedia)
Identities
| Source Type | Identity |
|---|---|
| Wikipedia | Grey-headed fish eagle |
| Wikidata | Q27074633 |
| DBpedia | N/A |
| ProductOntology | N/A |
| Wiktionary | N/A |
| Library of Congress Subject Headings (LCSH) | N/A |
| MeSH | N/A |
| NCBI Taxonomy | Haliaeetus ichthyaetus |
| AGROVOC | N/A |
| Google Scholar | Haliaeetus ichthyaetus grey-headed fish eagle wetlands Philippines raptor |
| ConceptNet | bird |
| OpenCyc | N/A |
Also Known As
- Haliaeetus ichthyaetus (scientific name)
- Ichthyophaga ichthyaetus (former generic placement)
Examples and Analogies
- The Fisherman of the Flooded Forest: Where the Philippine eagle rules montane rainforest, the grey-headed fish eagle commands the waterways, an equally demanding predator specialized for a single prey strategy.
- A Wetland Watchdog: Its presence signals productive fisheries and clean water, because a river that cannot support fish cannot support this eagle.
Usage Scenarios
1. Wetland Monitoring Focus
Counts of fish eagles along Philippine rivers and marshes, such as those during the Asian Waterbird Census, provide a raptor-based measure of wetland health.
2. Flagship for River Conservation
Local conservation campaigns use resident fish eagle pairs as flagship species when advocating against destructive riverbed extraction and riverside forest clearing.
Strategies
- Protect tall waterside trees used for nesting and perching when planning infrastructure along rivers and lakes.
- Maintain fish passage and natural flow regimes in dam and irrigation projects.
- Reduce disturbance by zoning fishing and boating activity away from active nests during the breeding season.
Security and Safety Measures
- Protected under Republic Act No. 9147 as a Philippine wildlife species.
- Raptor research involving nest monitoring requires DENR permits and minimal-impact protocols.
- Communities near nests should avoid cutting perch trees, which are often the tallest riverside remnants.
Historical Context
The species was described to science in the early nineteenth century from South Asian material, and later ornithological surveys recorded it across Southeast Asia, including the Philippines. Traditionally placed in the fishing-eagle genus Ichthyophaga, modern taxonomic treatments merge that genus into Haliaeetus, placing it alongside other sea and fish eagles. In the Philippines it has always been a locally distributed wetland bird, and twentieth-century conversion of marshes and riverside forest gradually reduced known sites.
Challenges and Controversies
Wetland Shrinkage
Drainage of marshlands, quarrying of rivers, and clearing of riparian forest steadily remove the hunting and nesting habitat this eagle requires.
Conflicts with Fish Farmers
Fish eagles are sometimes persecuted at aquaculture ponds under the perception that they deplete stocks, despite limited actual damage, complicating community relations.
Related Topic
Philippine Eagle