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Comparison of fish size distribution and fish abundance estimatesobtained with hydroacoustics and gill netting in the open waterof a large shallow lake

Published online by Cambridge University Press:  15 January 2009

I. Tátrai ,
A. Specziár ,
A. I. György  and
P. Bíró
I. Tátrai
Affiliation:
Balaton Limnological Research Institute of the Hungarian Academy of Sciences, H-8237 Tihany, Hungary.
A. Specziár
Affiliation:
Balaton Limnological Research Institute of the Hungarian Academy of Sciences, H-8237 Tihany, Hungary.
A. I. György
Affiliation:
Balaton Limnological Research Institute of the Hungarian Academy of Sciences, H-8237 Tihany, Hungary. Pannon University, Department of Limnology, H-8200 Veszprém, Hungary.
P. Bíró
Affiliation:
Balaton Limnological Research Institute of the Hungarian Academy of Sciences, H-8237 Tihany, Hungary.
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Abstract

The distribution and overall fish abundance, and biomass of fish populations in the open water of meso-eutrophic Lake Balatonwere 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 fromhydroacoustics and length distribution from the gillnets showed that the fishing gear did not quantitatively catch the smallest andlargest size groups of fish. Mean acoustic fish abundance and biomass fluctuated significantly between both basins and years. Thebiomass of fish populations reflects the trophic gradient along the longitudinal axis of the lake (min-max.: 89-181 kg ha-1) showinga decreasing trend with years. The mean acoustic fish biomass was significantly higher in the eutrophic western basin, comparedwith mesotrophic eastern and middle ones.

Keywords

split beam echo sounding; horizontal beaminggillnet catchesfish abundance and biomassshallow lake
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 44 , Issue 4 , 2008 , pp. 231 - 240
Copyright
© Université Paul Sabatier, 2008

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