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close| Location | Bulgaria, Montana |
| Central coordinates | 23o 5.12' East 43o 47.45' North |
| IBA criteria | A1, B2, C1, C6 |
| Area | 475 ha |
| Altitude | 30 - 39m |
| Year of IBA assessment | 2005 |
Ornithological information This site is important for species of global conservation concern (Aythya nyroca and Phalacrocorax pygmeus), and supports large numbers of breeding Ixobrychus minutus. Breeding species of global conservation concern that do not meet IBA criteria: Crex crex (uncommon).
Site description The former Orsoya marshes, on the bank of the River Danube, which have been converted to fish-ponds and overgrown by stands of Phragmites and Typha. In deep parts of the ponds there are water-lilies Nymphoides and Nymphaea. The ponds are surrounded by meadows, scrub and trees. Land-uses include fish-farming, haymaking, and hunting.
Populations of IBA trigger species
| Species | Season | Period | Population estimate | Quality of estimate | IBA Criteria | IUCN Category |
|---|---|---|---|---|---|---|
| Ferruginous Duck Aythya nyroca | breeding | 2004 | 12-30 breeding pairs | medium | A1, C1, C6 | Near Threatened |
| Ferruginous Duck Aythya nyroca | passage | 1996 | 48-79 individuals | good | A1, C1 | Near Threatened |
| Little Bittern Ixobrychus minutus | breeding | 1996 | 100 breeding pairs | good | B2, C6 | Least Concern |
| Purple Heron Ardea purpurea | breeding | 1996 | 10 breeding pairs | good | C6 | Least Concern |
| Pygmy Cormorant Phalacrocorax pygmeus | passage | 1996 | 40-180 individuals | good | A1, C1 | Least Concern |
Protected areas
| Protected area | Designation | Area (ha) | Relationship with IBA | Overlap with IBA (ha) | |
|---|---|---|---|---|---|
| Orsoya | Protected Landscape | 150 | protected area contained by site | 150 | |
| Orsoya - BG0000182 | Habitats Directive | 2,461 | protected area contains site | 475 | |
| Orsoya Fish-ponds - BG0002006 | Birds Directive | 475 | is identical to site | 475 |
Habitats
| IUCN habitat | Habitat detail | Extent (% of site) |
|---|---|---|
| Forest | Alluvial and very wet forest | 5% |
| Grassland | Humid grasslands | 20% |
| Wetlands (inland) | Standing freshwater; Water fringe vegetation | 70% |
| Artificial landscapes (terrestrial) | Perennial crops, orchards and groves | 5% |
Land use
| Land-use | Extent (% of site) |
|---|---|
| fisheries/aquaculture | 60% |
| hunting | 70% |
| other | 20% |
Management considerations The main problem is the cutting and burning of reedbeds during the breeding season.
Protection status National None International None
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Orsoya Fish-ponds. Downloaded from http://www.birdlife.org on 25/05/2013
To provide new information to update this factsheet or to correct any errors, please email BirdLife
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