CHEMICAL ANALYSIS OF WATER USED FOR FISH FARMING IN TUNDZHA RIVER, BULGARIA
The aim of the study was to assess some chemical parameters in water fromÂ Tundzha River used for common carp (Cyprinus carpio L.) farming. Water samples wereÂ taken according to protocol in September 2014 from the fish farm located near the townÂ Nikolaevo. Results showed compliance with regulations for most of the studiedÂ parameters. A slight increase of ammonia (NH3) was found in the control sample. In bothÂ locations elevation of nitrates (NO3) and phosphates (PO4) was registered, suggestingÂ contamination of the water from agricultural use of organophosphate insecticides andÂ nitrogen fertilizers. In conclusion, effective measures should be taken to protect waterÂ resources in Tundzha River used in fish farming from agricultural pollution.