Cristin-resultat-ID: 1671668
Sist endret: 3. februar 2019, 04:57
NVI-rapporteringsår: 2018
Resultat
Vitenskapelig artikkel
2018

Night fish avoidance of Microcystis bloom revealed by simultaneous hydroacoustic measurements of both organisms

Bidragsytere:
  • Małgorzata Godlewska
  • Helge Balk
  • Zbigniew Kaczkowski
  • Tomasz Jurczak
  • Katarzyna Izydorczyk
  • Bronislaw Dlugoszewski
  • mfl.

Tidsskrift

Fisheries Research
ISSN 0165-7836
e-ISSN 1872-6763
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2018
Publisert online: 2018
Trykket: 2018
Volum: 207
Sider: 74 - 84
Open Access

Importkilder

Scopus-ID: 2-s2.0-85048714199

Beskrivelse Beskrivelse

Tittel

Night fish avoidance of Microcystis bloom revealed by simultaneous hydroacoustic measurements of both organisms

Sammendrag

Abstract Simultaneous observations of fish and cyanobacteria were conducted in the shallow Sulejów Reservoir (Poland) during the occurrence of Microcystis bloom. A Simrad EY60 split beam echosounder with a 200 kHz transducer beaming horizontally was applied to assess fish and cyanobacteria spatial distribution. Additionally, fish size distribution and species composition were evaluated with gillnets, and cyanobacterial biomass was determined by using an online phycocyanin fluorescence probe. Physico-chemical parameters and water samples for biological analyses were collected at 14 fixed stations situated along the acoustic transects. We found cyanobacteria represented by the genus Microcystis, with their toxigenic genotypes in all analyzed samples. The hydroacoustic results provided direct evidence for fish night avoidance of the bloom. The biomass of fish and cyanobacteria demonstrated opposing trends and their peak values spatially mismatched. The number of fish caught in gillnets within the bloom area was about half that caught outside the bloom area. In spite of the presence of intracellular microcystins (hepatotoxin) at all stations, no extracellular microcystins were identified in water samples and in fish tissues.

Bidragsytere

Małgorzata Godlewska

  • Tilknyttet:
    Forfatter
    ved Polska Akademia Nauk

Helge Balk

  • Tilknyttet:
    Forfatter
    ved Elektronikk ved Universitetet i Oslo

Zbigniew Kaczkowski

  • Tilknyttet:
    Forfatter
    ved Uniwersytet Łódzki

Tomasz Jurczak

  • Tilknyttet:
    Forfatter
    ved Uniwersytet Łódzki

Katarzyna Izydorczyk

  • Tilknyttet:
    Forfatter
    ved Polska Akademia Nauk
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