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Dependence of beach seine net efficiency on net length and diel period

Published online by Cambridge University Press:  03 December 2008

Milan Říha ,
Jan Kubečka ,
Tomáš Mrkvička ,
Marie Prchalová ,
Martin Čech ,
Vladislav Draštík ,
Jaroslava Frouzová ,
Milan Hladík ,
Eva Hohausová  and
Oldřich Jarolím
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Milan Říha
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Jan Kubečka
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
Tomáš Mrkvička
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Marie Prchalová
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Martin Čech
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
Vladislav Draštík
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Jaroslava Frouzová
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
Milan Hladík
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
Eva Hohausová
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
Oldřich Jarolím
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Tomáš Juza
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Michal Kratochvíll
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Jiří Peterka
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
Michal Tušer
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice 370 05, Czech Republic
Mojmír Vašek
Affiliation:
Biology Centre AS CR v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 370 05, Czech Republic
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Abstract

The aim of this study was to quantify the efficiency of different lengths of beach seine nets for each diel period in freshwater reservoirs. Only fish older than young-of-the-year were considered. Nets of 10, 20 and 50 m length (“in-nets”) were tested in an enclosed area framed by a 200 m long net (block net). The net efficiency estimate was calculated as the ratio of fish catches with the in-net and block net divided by the ratio of their respective areas. The net efficiency estimate was significantly different between day and night catches. At night, the efficiency estimate of nets depended on the size of the fish. The efficiency estimate of a 10 m long net decreased significantly in reverse correlation with fish size. A similar trend was found when using a 20 m long net. The efficiency estimate of a 50 m long net was independent of fish size. The variance in efficiency estimate between samples with a given net length was high, but decreased with longer nets. Of five species tested, only the efficiency estimate for catching bream (Abramis brama) increased significantly with the length of net. The biomass and abundance of larger fish was generally higher at night, although especially short nets exhibited a spuriously high efficiency estimate during the day, probably due to the concentrating (chasing) effect of the hauling ropes. We therefore recommend the use of a 50 m long net, since its nighttime efficiency estimate was about 0.9 in terms of both sampling abundance and biomass. A model relating the efficiency estimate and net length was developed with the data acquired.

Keywords

Beach seine netNet lengthEfficiency estimateSize selectivityFreshwater fishEuropean reservoir
Type
Research Article
Information
Aquatic Living Resources , Volume 21 , Issue 4 , October 2008 , pp. 411 - 418
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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