Modern problems of fish food safety in water bodies of the Karaganda region
Insignificant contamination of fish with toxic elements was established, while the greatest accumulation of cadmium and lead in fish meat from the reservoir “DSU-58” (Nurinsky district) was noted. No residual radionuclides were detected in the fish. A very high infection of roach was revealed due to the disease postdiplostomatosis which was diagnosed in all three reservoirs, the invasion rate in the reservoir “Dam No.1” (Bukhar-Zhyrau district) was 12.5%, in the lake “Toksumak” (Osakarovsky district) 18.7 % and in the reservoir “DSU-58” (Nurinsky district) 42.8%. In rare cases diplostomiasis was found in the roach (Lake Toksumak) with an invasion intensity of 12.5%, and ligulosis in the roach and crucian carp (dam DSU-58), where the invasiveness was 14.8 and 14.2%, respectively. In a clinical study of fish infected with bacteriosis the disease was not observed.