EFFECTS OF SUBLETHAL CONCENTRATIONS OF COPPER AND THERMAL STRESS ON PHYSIOLOGICAL AND BIOCHEMICAL PARAMETERS OF JUVENILE ROACH RUTILIUS RUTILIUS (L.)

The effects of 7- and 14-day exposure to water-dissolved Cu at sublethal concentrations 0.01 0.1 mg/L subsequent increase in water temperature a rate 8°C/h on intestinal proteolytic activity (PA) amylolytic (AA), as well brain acetylcholinesterase (AChE) water-soluble protein (WSP) content juvenile roach Rutilus rutilus have been vivo studied. Additionally, the values upper were determined by critical thermal maximum (CTM) method. average CTM (27.5°C) did not differ fish control (exposure 0 μg/L Cu) Cu-exposed groups. After AA was 22–34% lower, PA 57–64% lower concentration mg/L, but 27–35% higher mg/L. Subsequent stress change response proteinases glycosidases Cu. An decreased 21%, AChE 24% group; increased 32%. 24–28% than after (0.1 short-term load inhibitory effect WSP 36–58% revealed only 7 days Cu, while effect. In general, found aquatic environment can reduce digestive hydrolases intestines roach, reducing assimilation carbohydrate food components. Inhibition is enhanced stress. No significant differences noticed group. results obtained are important assessing environmental risks chronic zones pollution bodies.