Abstract
Separate and combined action of temperature, pH, and heavy metals (copper and zinc) upon whole body activities of casein-and hemoglobinlytic proteinases were studied in perch (Perca fluviatilis), ruff (Gymnocephalus cernuus), roach (Rutilus rutilus), kilka (Clupeonella cultriventris), and common carp (Cyprinus carpio). Also, these activities were determined in cyprinids’ underyearlings (in sum) dominating the food of typical and facultative piscivores. It was revealed that, following a decrease in temperature to 0°C and in the presence of heavy metals (copper and zinc) at concentrations of 10 mg/l, casein-and hemoglobinlytic proteinase activities decreased statistically significantly in all studied fish. Both decrease and increase in pH values lead to less pronounced changes in the enzymatic activities varied in different species. As a rule, decrease in pH values resulted in considerable increase of the hemoglobinlytic activity, while pH increase caused inconsiderable enzyme activation. Combined action of natural factors and, in some cases, combined action of low temperature and metals, changed the caseinlytic activity to a greater extent than at their separate actions. Magnitude of multifactor effects in most cases is lower than of bifactor effects of temperature and metals.
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Original Russian Text © V.V. Kuz’mina, N.V. Ushakova, 2007, published in Voprosy Ikhtiologii, 2007, Vol. 47, No. 6, pp. 837–846.
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Kuz’mina, V.V., Ushakova, N.V. The effect of temperature, pH, and heavy metals (copper, zinc) upon proteinase activities in the potential preys for typical and facultative piscivores. J. Ichthyol. 47, 791–801 (2007). https://doi.org/10.1134/S0032945207090123
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DOI: https://doi.org/10.1134/S0032945207090123