Počet záznamů: 1  

The vertical distribution of fish in the open water area of a deep temperate mesotrophic lake assessed by hydroacoustics and midwater trawling

  1. 1.
    0385281 - BC 2013 RIV DE eng J - Článek v odborném periodiku
    Jůza, Tomáš - Frouzová, Jaroslava - Brämick, U. - Draštík, Vladislav - Mrkvička, Tomáš - Kubečka, Jan
    The vertical distribution of fish in the open water area of a deep temperate mesotrophic lake assessed by hydroacoustics and midwater trawling.
    International Review of Hydrobiology. Roč. 97, č. 6 (2012), s. 509-525. ISSN 1434-2944. E-ISSN 1522-2632
    Grant CEP: GA AV ČR(CZ) IAA600960901
    Institucionální podpora: RVO:60077344
    Klíčová slova: smelt * vendace * trawling * hydroacoustics * Lake Werbellin
    Kód oboru RIV: EH - Ekologie - společenstva
    Impakt faktor: 0.870, rok: 2012

    The fish stock of a deep temperate, mesotrophic lake was sampled at different depths using a fixed-frame fry trawl, during two nights in mid-September 2009. Additionally, horizontal and vertical hydroacoustics were used simultaneously to evaluate fish abundance and biomass estimates obtained by the trawl. Roach Rutilus rutilus and smelt Osmerus eperlanus were the dominant species of young-of the-year (YOY) fish in the trawl catches from the surface layers (0–9 m). Bleak Alburnus alburnus dominated the catch of older fish in the upper part of the surface profile (0–6 m). Around the thermocline (9–13 m) smelt dominated the catches of both the YOY and older fish. Beneath the thermocline (13–36 m) vendace Coregonus albula dominated the catch of YOY fish, and smelt was the only species of older fish in the trawl catches. Species composition, abundance and biomass of the YOY and older fish were heterogeneous throughout the depth profiles of the lake, but only abundance differed significantly between the layers. The hydroacoustics gave relatively similar estimates of abundance and biomass to those obtained by the trawl in all the depths sampled. Our results indicate that there is a clear separation of small fish of different species along the vertical profile of a deep temperate lake during the night, and an unequal vertical distribution of fish abundance and biomass. The similarity of the trawl and hydroacoustics estimates of abundances and biomass indicated that the trawl sampling did not cause important avoidance reactions of small fish during the night in this deep temperate lake.
    Trvalý link: http://hdl.handle.net/11104/0214587

     
     
Počet záznamů: 1  

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