V. V. Kuz’mina and N. V. Ushakova
Papanin Institute of Biology of Inland Waters, Russian Academy of Sciences,
Borok, Nekouzskii raion, Yaroslavl oblast, 152742 Russia
e-mail: vkuzmina@ibiw.yaroslavl.ru
Received July 4, 2006
Abstract—Species-specific differences and effects of natural (temperature, pH) and anthropogenic (zinc, cop-
per) factors upon activities of casein- and hemoglobinlytic proteinases have been studied in the gut mucosa in
pike (Esox lucius), zander (Stizostedion lucioperca), burbot (Lota lota) and perch (Perca fluviatilis). It is
revealed that the intestine mucosa proteinase activities differ considerably from those ones in the fish stomach
mucosa and that studied factors affect these activities to different extents. The stomach mucosa proteinases are
most tolerant to the effects of studied factors, which is especially true for pike. The least tolerant are the intestine
caseinlytic proteinases (except for the enzymes in perch). The effects of temperature, pH, and heavy metals
depend on fish species, factors' combinations (mono-factor, bi-factor, or multi-factor action) and on factor vari-
ability.
DOI: 10.1134/S0032945207060070
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