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Location Croatia, Viroviticko-podravska zupanija
Central coordinates 18o 3.00' East  45o 40.00' North
IBA criteria A1, B1i, B2, B3
Area 1,020 ha
Altitude 99 - 102m
Year of IBA assessment 2000

Association BIOM (Affiliate)

Site description A complex of fish-ponds surrounded by water-fringe vegetation and some completely covered with emergent vegetation. Wet meadows and pastures are adjacent to the fish-ponds.

Key Biodiversity This is an important site for breeding herons and terns. Species of global conservation concern that do not meet IBA criteria: Aythya nyroca, Haliaeetus albicilla (1-9 wintering).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Common Pochard Aythya ferina breeding  1993  17 breeding pairs  medium  B3  Vulnerable 
Ferruginous Duck Aythya nyroca breeding  1993  20-50 breeding pairs  medium  A1, B2  Near Threatened 
Ixobrychus minutus breeding  1995  15-20 breeding pairs  medium  B2  Not Recognised 
Black-crowned Night-heron Nycticorax nycticorax breeding  1995  23-100 breeding pairs  good  B2  Least Concern 
Squacco Heron Ardeola ralloides breeding  1995  2-20 breeding pairs  good  B2  Least Concern 
Whiskered Tern Chlidonias hybrida breeding  1993  200 breeding pairs  medium  B1i, B2  Least Concern 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Mocvarno Podrucje orepak Kod Metkovica Special Reserve 100 protected area contained by site 97  


IUCN habitat Habitat detail Extent (% of site)
Forest   -
Grassland Humid grasslands  5%
Wetlands (inland) Standing freshwater; Water fringe vegetation  90%
Artificial - terrestrial   5%

Land use

Land-use Extent (% of site)
fisheries/aquaculture 95%
hunting 95%
agriculture 5%

Protection status National None International None

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Grudnjak fish-ponds. Downloaded from on 24/10/2016

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