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      Status of the burbot ( Lota lota L.) in the Lower Danube (Bulgaria) – a species threatened by climate change

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          Abstract

          Abstract

          The study provides data on the catch composition, length-weight relationship, age structure, gender structure, growth, maturation, fecundity, distribution and conservation status of the burbot Lota lota (Linnaeus, 1758) in Bulgaria. During six consecutive winters (2008–2014) a total of 395 burbot specimens were caught. The total length and the weight of the specimens ranged from 16 to 51 cm and 29.8 to 1057 g, respectively. Seven age classes were represented (3- to 9-years-old), with 3-, 4-, and 5-years-old most abundant. The maximal life expectancy was estimated as 12 years. Male-female ratio was 1:1. Maturity happens at the age of four at the earliest, valid for both sexes. One-quarter of the fish, older than 5 years were determined as non-reproducing in the particular year. The absolute fecundity varied between 47 462 and 810 236 eggs for females ranging from 5 to 7 years old and from 25.7 to 41.5 cm in length. A dramatic decrease of burbot population was observed in the last two decades. Warming water temperatures of the Danube, together with fragmentation in its tributaries are considered as the major threats affecting the species. Therefore, the burbot in Bulgaria is classified as Endangered.

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          Most cited references 30

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          Cube law, condition factor and weight-length relationships: history, meta-analysis and recommendations

           R Froese (2006)
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            Worldwide status of burbot and conservation measures

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              Food, growth, habitat, and community interactions of young-of-the-year burbot, Lota lota L., in a Precambrian Shield lake

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                Author and article information

                Contributors
                Journal
                Zookeys
                Zookeys
                2
                urn:lsid:arphahub.com:pub:45048D35-BB1D-5CE8-9668-537E44BD4C7E
                urn:lsid:zoobank.org:pub:91BD42D4-90F1-4B45-9350-EEF175B1727A
                ZooKeys
                Pensoft Publishers
                1313-2989
                1313-2970
                2020
                10 February 2020
                : 910
                : 143-161
                Affiliations
                [1 ] Forestry University, Faculty of Forestry, Department of Hunting and Game Management, 10 Kliment Ohridski Blvd., 1756 Sofia, Bulgaria Forestry University Sofia Bulgaria
                [2 ] Institute of Biodiversity and Ecosystem Research (IBER), Bulgarian Academy of Sciences, 1 Tsar Osvoboditel Blvd., 1000 Sofia, Bulgaria Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences Sofia Bulgaria
                Author notes
                Corresponding author: Pencho G. Pandakov ( p.pandakov@ 123456gmail.com )

                Academic editor: M.E. Bichuette

                Article
                47866
                10.3897/zookeys.910.47866
                7026198
                Pencho G. Pandakov, Teodora M. Teofilova, Nikolay D. Kodzhabashev

                This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                Categories
                Research Article
                Actinopterygii
                Gadiformes
                Lotidae
                Biodiversity & Conservation
                Ecology & Environmental sciences
                Cenozoic
                Europe

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