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Abstract

The feeding habits of Perca fluviatilis in the water bodies of the lake-river system of the Pista River (White Sea basin) from May to October were studied. The stomach contents of the perches were analyzed. The occurrence frequency of food items and ratio to the total mass of the food bolus were calculated using standard methods. The contents of the stomachs were described using the index of fullness, the occurrence of major groups of food items and their relative importance. The taxonomic richness of the fish’s food supply was estimated by the regression models, which describe the accumulation of food items with an increase in the number of examined stomachs. There was no substantial differentiation in the taxonomic composition of food items between the river and the lake. Zoobenthos prevailed in the spring and summer everywhere, and fish was the second dominant food item. The river displays two distinctive features in this time: a) the poor contribution of the zooplankton due to its scarcity in running water and b) the use of fish as food items by smaller perches. A considerable decrease in the taxonomic richness model values of food items and increase in the number of empty stomachs indicate deterioration of feeding conditions in autumn. Therefore, perch begins to consume the imago of aerial insects, which fell into the water, and fish more actively. However the season feeding spectrum is considerably restructured only in the river, where fish becomes the major type of food. The transition to a predatory mode of life seems to compensate for the shortage of other food resources. The results of the study show that a running water regime transforms the feeding patterns of perch.  In a fluvial environment, the contribution of zooplankton decreases markedly and perches use fish as food more actively. The fish and aerial insects become the main food of perch in the river in autumn.

Keywords

European perch Lake-river ecosystem Feeding spectrum Food supply richness Predation

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The authors transfer the copyrights of their papers to the Iranian Society of Ichthyology. However, the information could be used in accordance with the Creative Commons licence (Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

How to Cite
SHUSTOV, Y. A., LESONEN, M. A., & V. GORBACH, V. (2024). Feeding patterns of the <i>Perca fluviatilis</i> (Linnaeus, 1758) in running and stagnant water bodies in Northwest Russia. Iranian Journal of Ichthyology, 11(2), 115–123. https://doi.org/10.22034/iji.v11i2.1009
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