1. Department for cytology, histology and embryology, Institute of Biology, Faculty of Natural Sciences and Mathematics; Ss Cyril and Methodius University in Skopje Arhimedova 3; Skopje 1000 Macedonia
2. Laboratory for Biological Effects of Metals; Ruđer Bošković Institute, Division for Marine and Environmental Research; Bijenička 54 Zagreb 10002 Croatia
3. Air and Soil Quality Monitoring and Laboratory Analyses; Hydrobiology and Ecology Department; Ministry of Agriculture, Forestry and Water Economy, Hydrometeorological Administration, Division for Water; Skupi 28 Skopje 1000 Macedonia
4. Fishery department; Institute of Animal Sciences; Ile Ilievski 92a Skopje 1000 Macedonia
5. Laboratory for Aquaculture and Pathology of Aquatic Organisms; Ruđer Bošković Institute, Division for Marine and Environmental Research; Bijenička 54 Zagreb 10002 Croatia