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| Lesser fish eagle | |
|---|---|
| Name | Lesser fish eagle |
| Genus | Ichthyophaga |
| Species | humilis |
Lesser fish eagle The Lesser fish eagle is a medium-sized raptor of freshwater and coastal wetlands notable for piscivory and perch-hunting. It occupies riparian and estuarine landscapes across parts of South and Southeast Asia and is recognized by regional researchers, birdwatchers, and conservation organizations for its ecological role in aquatic food webs. Studies by ornithologists and naturalists have compared its morphology and behavior with congeners and other fish-eating raptors.
Described within the genus Ichthyophaga, taxonomic treatments have been discussed in monographs and checklists by authors affiliated with institutions such as the British Ornithologists' Union, Linnaean Society of London, Natural History Museum, London, Zoological Society of London, and regional museums. Molecular phylogenetics published in journals on vertebrate systematics involving researchers from University of Oxford, Smithsonian Institution, and Australian National University have tested relationships among Accipitriformes, using mitochondrial and nuclear markers. Historical catalogues by collectors associated with the British Museum and expedition reports linked to the Indian Museum, Kolkata informed early descriptions. Nomenclatural decisions have referenced the rules of the International Commission on Zoological Nomenclature and regional checklists maintained by entities like the IUCN and national ornithological societies.
Adults display a compact body, short tail, and relatively short wings compared to sea eagles described in field guides by organizations such as the Royal Society for the Protection of Birds and the Audubon Society. Plumage notes appear in field handbooks published with contributions from curators at the American Museum of Natural History and authors with affiliations to the Cornell Lab of Ornithology. Morphometric comparisons with species treated in monographs from the Museum für Naturkunde and the Naturalis Biodiversity Center include bill shape, talon curvature, and feather pattern. Vocalizations have been catalogued in sound archives curated by the British Library and research groups at the Macaulay Library.
The species occurs in river systems, reservoirs, mangrove edges, and estuaries recorded in regional surveys by agencies such as the Wildlife Institute of India, Bangladesh Bird Club, Myanmar Bird and Nature Society, and conservation NGOs like BirdLife International. Range maps in atlases produced by the Thrushes and Allies Research Group and national wildlife departments show presence across parts of the Indian Subcontinent, Indochina, and island records reported to biodiversity repositories at the National Biodiversity Network and university herbaria. Habitat descriptions reference wetland designations under frameworks used by the Ramsar Convention and assessments by governmental ministries responsible for protected areas. Field observations have been published in proceedings of symposia convened by the Asian Raptor Research Network and regional conferences hosted by universities such as University of Delhi and Chulalongkorn University.
Behavioral studies drawing on methods used by researchers at the Max Planck Institute for Ornithology and field teams affiliated with the Wildlife Conservation Society report perch-hunting, territorial displays, and seasonal movements. Social interactions are compared with patterns documented for piscivorous raptors in literature from the Institute of Ecology and Evolution, University of Berne and behaviorists publishing in journals backed by societies like the Ecological Society of America. Roosting and communal use of trees have been surveyed in collaboration with municipal forestry departments and NGOs such as World Wildlife Fund. Movement data have been contributed to biodiversity platforms hosted by the Global Biodiversity Information Facility and telemetry studies coordinated with university partners.
Diet consists primarily of fish, with prey composition documented in stomach-content analyses and observational studies led by ichthyologists and ornithologists from institutions like the Central Marine Fisheries Research Institute, Bangladesh Fisheries Research Institute, and academic departments at Bangor University and University of Calcutta. Hunting techniques—plunge-diving from exposed perches, snatching at the water surface, and occasional gleaning—are described in comparative works on raptor foraging by researchers associated with the British Trust for Ornithology and the Raptor Research Foundation. Interactions with local fishing communities and records in fisheries reports from ministries have been noted in socio-ecological assessments.
Breeding phenology and nest characteristics have been recorded in nesting surveys coordinated by regional wildlife departments and contributors to breeding bird atlases produced by the Bombay Natural History Society and university researchers. Clutch sizes, incubation periods, and nestling development follow patterns reported for small Accipitriformes in handbooks published by the Handbook of the Birds of the World project and monographs from academic presses associated with the University of Cambridge and Yale University. Juvenile dispersal and survivorship estimates derive from banding programs run by national ringing centers and collaborative projects with NGOs such as Wetlands International.
Assessments by the IUCN Red List and national conservation agencies evaluate population trends influenced by habitat loss, water abstraction, pollution, and disturbance from infrastructural projects overseen by ministries and corporations documented in environmental impact assessments filed with agencies like the Ministry of Environment, Forest and Climate Change (India). Threat analyses reference wetlands designated under the Ramsar Convention and mitigation measures recommended by conservation organisations including BirdLife International, World Wide Fund for Nature, and local conservation groups. Recovery actions in regional conservation plans involve protected area management by agencies such as national parks authorities and partnerships with universities and NGOs for monitoring, research, and community engagement.
Category:Ichthyophaga