An assessment of the state of roach (Rutilus rutilus; Cypriniformes; Actinopterygii) and its living conditions on the Kazakhstan part of the Syrdarya River

Abstract

Concentrations of pesticides in water and fish tissues, different ions in underwater soils, morphobiological indexes of the roach were investigated in the Kazakhstan part of the Syrdarya River. All samples of carp and roach tissues displayed detectable contamination, with the most frequently detected compounds in fish tissues being Lindane, Heptachlor, Endosulfan alfa and beta. Ammonium concentrations in the all investigated soils were more than 3 mg per liter. Specific parts of sodium (SAR-index) were quite high in the underwater soils. The roach remained a numerous fish species despite on environment pollution. The state of population of roach was estimated as relatively well.