Comparison of fish size distribution and fish abundance estimates obtained with hydroacoustics and gill netting in the open water of a large shallow lake

I. Tátrai, A. Specziár, A. I. György, P. Bíró

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The distribution and overall fish abundance, and biomass of fish populations in the open water of meso-eutrophic Lake Balaton were studied in 2003-2007 using hydroacoustics and gill nets. Gillnet catches revealed that bleak (53-76 %) common bream (8-42 %), white bream and razor fish (2-18 %) dominated in the open water of the lake. Comparisons of target strength distribution from hydroacoustics and length distribution from the gillnets showed that the fishing gear did not quantitatively catch the smallest and largest size groups of fish. Mean acoustic fish abundance and biomass fluctuated significantly between both basins and years. The biomass of fish populations reflects the trophic gradient along the longitudinal axis of the lake (min-max.: 89-181 kg ha-1) showing a decreasing trend with years. The mean acoustic fish biomass was significantly higher in the eutrophic western basin, compared with mesotrophic eastern and middle ones.

Original languageEnglish
Pages (from-to)231-240
Number of pages10
JournalAnnales de Limnologie
Volume44
Issue number4
DOIs
Publication statusPublished - 2008

Fingerprint

netting
open water
gills
lakes
lake
fish
gillnets
water
gillnet
biomass
acoustics
Blicca bjoerkna
basins
target strength
fishing gear
bream
group size
comparison
basin
distribution

Keywords

  • Fish abundance and biomass
  • Gillnet catches
  • Horizontal beaming
  • Shallow lake
  • Split beam echo sounding

ASJC Scopus subject areas

  • Aquatic Science

Cite this

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title = "Comparison of fish size distribution and fish abundance estimates obtained with hydroacoustics and gill netting in the open water of a large shallow lake",
abstract = "The distribution and overall fish abundance, and biomass of fish populations in the open water of meso-eutrophic Lake Balaton were studied in 2003-2007 using hydroacoustics and gill nets. Gillnet catches revealed that bleak (53-76 {\%}) common bream (8-42 {\%}), white bream and razor fish (2-18 {\%}) dominated in the open water of the lake. Comparisons of target strength distribution from hydroacoustics and length distribution from the gillnets showed that the fishing gear did not quantitatively catch the smallest and largest size groups of fish. Mean acoustic fish abundance and biomass fluctuated significantly between both basins and years. The biomass of fish populations reflects the trophic gradient along the longitudinal axis of the lake (min-max.: 89-181 kg ha-1) showing a decreasing trend with years. The mean acoustic fish biomass was significantly higher in the eutrophic western basin, compared with mesotrophic eastern and middle ones.",
keywords = "Fish abundance and biomass, Gillnet catches, Horizontal beaming, Shallow lake, Split beam echo sounding",
author = "I. T{\'a}trai and A. Speczi{\'a}r and Gy{\"o}rgy, {A. I.} and P. B{\'i}r{\'o}",
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T1 - Comparison of fish size distribution and fish abundance estimates obtained with hydroacoustics and gill netting in the open water of a large shallow lake

AU - Tátrai, I.

AU - Specziár, A.

AU - György, A. I.

AU - Bíró, P.

PY - 2008

Y1 - 2008

N2 - The distribution and overall fish abundance, and biomass of fish populations in the open water of meso-eutrophic Lake Balaton were studied in 2003-2007 using hydroacoustics and gill nets. Gillnet catches revealed that bleak (53-76 %) common bream (8-42 %), white bream and razor fish (2-18 %) dominated in the open water of the lake. Comparisons of target strength distribution from hydroacoustics and length distribution from the gillnets showed that the fishing gear did not quantitatively catch the smallest and largest size groups of fish. Mean acoustic fish abundance and biomass fluctuated significantly between both basins and years. The biomass of fish populations reflects the trophic gradient along the longitudinal axis of the lake (min-max.: 89-181 kg ha-1) showing a decreasing trend with years. The mean acoustic fish biomass was significantly higher in the eutrophic western basin, compared with mesotrophic eastern and middle ones.

AB - The distribution and overall fish abundance, and biomass of fish populations in the open water of meso-eutrophic Lake Balaton were studied in 2003-2007 using hydroacoustics and gill nets. Gillnet catches revealed that bleak (53-76 %) common bream (8-42 %), white bream and razor fish (2-18 %) dominated in the open water of the lake. Comparisons of target strength distribution from hydroacoustics and length distribution from the gillnets showed that the fishing gear did not quantitatively catch the smallest and largest size groups of fish. Mean acoustic fish abundance and biomass fluctuated significantly between both basins and years. The biomass of fish populations reflects the trophic gradient along the longitudinal axis of the lake (min-max.: 89-181 kg ha-1) showing a decreasing trend with years. The mean acoustic fish biomass was significantly higher in the eutrophic western basin, compared with mesotrophic eastern and middle ones.

KW - Fish abundance and biomass

KW - Gillnet catches

KW - Horizontal beaming

KW - Shallow lake

KW - Split beam echo sounding

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