Significant differences in pH dependence of proteolytic and amylolytic enzyme activities in the gut microbiota between crucian carps from different habitats (the Dniester River and Kuchurgan Reservoir) have been revealed for the first time. The proteolytic activity in fish from these water bodies reaches a peak at pH values varying from 7 to 10, while the peak of amylolytic activity is consistently observed at pH 7.0. Both proteolytic and amylolytic activities are higher in fish from the Kuchurgan Reservoir (characterized by increased trophicity and high abundance of bacterioplankton) than in fish from the Dniester. For comparison, the effect of pH on proteinase and glycosidase activities in the gut mucosa and chyme of the same fish has been studied.
Russian Journal of Ecology – Springer Journals
Published: Jul 15, 2014
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