| Abstract: | The chronic effects that polychlorinated biphenyls (PCBs) have on the activities of proteinases and carbohydrates in intestinal
mucosa and chyme in juvenile roach Rutilus rutilus (L.) have been studied for the first time. Upon consuming food with PCB 50.8 ng/g wet weight for 218 days, the exposition
of fingerlings in aquariums with dirt bottoms (contents PCB 425.6 ng/g dry weight) reduces the proteolytic activity of mucosa
to a greater degree than amylolytic activity; the activity of sucrase changes in different directions. In 2-year-old fish
receiving PCB only with food (50.8 ng/g wet weight bottom), proteolytic and amylolytic activities of the mucosa are reduced
18 and 35% in comparison with the control (52 days); the sucrose activity is reduced 13% (52 days) and 22% (169 days). In
most cases the relation of amylolytic activity to proteolytic activity in fish of the experimental groups is less than in
the control. The enzyme activities in chyme change in different directions, depending on the terms and conditions of the experiment. |
