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The effect of pH on the activity of proteinases of intestine mucosa, chyme, and enteral microbiota was studied in three piscivorous fish species of the Rybinsk Reservoir differing in their ecological traits: pike Esox lucius, burbot Lota lota, and zander Sander lucioperca. In all fish species, studied pH of ten is optimal for the functioning of proteinases of intestine mucosa; in chyme proteinases,...
It has been revealed that fluctuations of salinity within the ecological norm positively affect the embryonic and larval development in pike Esox lucius. Within the optimal range of salinity (0−2‰ with fluctuation period of 12 h), compared to the constant optimal salinity (2‰), the growth and development rate accelerate, the survival rate of embryos and larvae increase especially during the critical...
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