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

0494981 - BC 2019 RIV SK eng J - Článek v odborném periodiku
Blabolil, Petr - Čech, Martin - Jůza, Tomáš - Kočvara, Luboš - Matěna, Josef - Říha, Milan - Vejřík, Lukáš - Peterka, Jiří
Condition and feeding behaviour of subadult burbot (Lota lota) in riverine and lacustrine environments.
Biologia. Roč. 73, č. 1 (2018), s. 83-91. ISSN 0006-3088. E-ISSN 1336-9563
Grant CEP: GA ČR(CZ) GA15-01625S; GA MŠMT(CZ) 7F14316; GA MŠMT(CZ) LD15021; GA MŠMT(CZ) LM2015075
Institucionální podpora: RVO:60077344
Klíčová slova: cormorant phalacrocorax-carbo * fresh-water fish * mackenzie river * lake
Obor OECD: Ecology
Impakt faktor: 0.728, rok: 2018

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.
Trvalý link: http://hdl.handle.net/11104/0288087