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The site was identified as internationally important for bird conservation in 2005 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Ferruginous Duck Aythya nyroca	NT	breeding (2004)	12–30 pairs	A1, C1, C6
Ferruginous Duck Aythya nyroca	NT	passage (1996)	48–79 birds	A1, C1
Common Little Bittern Ixobrychus minutus	LC	breeding (1996)	100 pairs	B2, C6
Purple Heron Ardea purpurea	LC	breeding (1996)	10 pairs	C6
Pygmy Cormorant Microcarbo pygmaeus	LC	passage (1996)	40–180 birds	A1, C1

Year	Protected Area	Designation (management category)	% coverage of IBA
2001	Ribarnitzi Orsoya	Zashtitena Mestnost (VI)	31
2001	Orsoya	Protected Landscape (-)	32

Habitat	% of IBA	Habitat detail
Wetlands (inland)	70	Standing freshwater; Water fringe vegetation
Grassland	20	Humid grasslands
Artificial/Terrestrial	5	Perennial crops, orchards and groves
Forest	5	Alluvial and very wet forest

Land use	% of IBA
hunting	70
fisheries/aquaculture	60
other	20

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Orsoya Fish-ponds (Bulgaria). Downloaded from https://datazone.birdlife.org/site/factsheet/orsoya-fish-ponds-iba-bulgaria on 23/12/2024.