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Condition and feeding behaviour of subadult burbot (Lota lota) in riverine and lacustrine environments

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Abstract

The condition and feeding behaviour of burbot, a widespread potamodromous species in riverine and lacustrine environments, were compared in order to evaluate the importance of both in three artificial systems. Subadult burbot were sampled in three temperate reservoirs in spring, and one of them also in summer and autumn. Standardised abundance and sizes of burbot were comparable between the reservoirs, but the conditions were significantly different. The Clark’s condition coefficient and index of fullness were independent of burbot size and individuals. Feeding behaviour in terms of abundance and composition of consumed food was environment-dependent. The most common prey category was aquatic insect larvae, dominating in the riverine environment. Permanent water invertebrates, microcrustaceans, beetles and crayfish were less common food and eaten more often in the lacustrine environment. Prey-fish were usually the most common species of suitable size. The food analyses demonstrated opportunistic feeding behaviour with selection of prey associated with benthic habitat and suitable size. Burbot is therefore flexible not only in environments utilisation, but also feeding strategy.

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Acknowledgments

Thanks are given to D. Bartoň, S. Chung, I. Koljada, M. Křížová, J. Kubečka, Z. Prachař and M. Vašek for assistance in field, laboratory support and helpful suggestions during manuscript preparation. This study was supported by grant of the Czech Science Foundation (15-01625S), by the University of South Bohemia (158/2016/P), by the Norwegian Financial Mechanism 2009-2014 under contract number MSMT-28477/2014 (7F14316), by the program COST-CZ under contract number MSMT-LD15021 and by the SoWa Research Infrastructure funded by MEYS CZ grant LM2015075, programme "Projects of Large Infrastructure for Research, Development, and Innovations".

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Correspondence to Petr Blabolil.

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Blabolil, P., Čech, M., Jůza, T. et al. Condition and feeding behaviour of subadult burbot (Lota lota) in riverine and lacustrine environments. Biologia 73, 83–91 (2018). https://doi.org/10.2478/s11756-018-0008-7

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  • DOI: https://doi.org/10.2478/s11756-018-0008-7

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