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Hydroacoustic estimates of fish stocks in temperate reservoirs: day or night surveys?

Published online by Cambridge University Press:  08 April 2009

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

Day and night acoustic surveys were used to compare fish stock estimates at eight European reservoirs and one flooded mining pit. During both photoperiods of summer, higher fish biomass was observed in the uppermost 4 m of the water column by horizontal beaming than in deeper water by vertical beaming. Comparisons of volume backscattering coefficient (sv), fish biomass (kg ha−1), abundance (ind. ha−1) and average fish weight (g) did not show a common pattern among the reservoirs but were found to vary significantly across photoperiods. At most reservoirs, the night surveys had higher estimates than day surveys. However, at several reservoirs the opposite pattern was observed. These patterns could not be explained by the species composition of the fish stocks. Fish size distributions were found to be different between day and night. A higher proportion of 1+ and older fish were found during the night at two of three studied waterbodies. In general, it was not possible to decide whether day or night acoustic surveys gave more reliable fish stock assessments. We advise performing both day and night transects on a given water body before deciding when to conduct the full survey. For a complete fish assessment it is very desirable to combine acoustic mobile surveys with active sampling gear.

Keywords

HydroacousticsFish biomassDiel migrationMan-made lake
Type
Research Article
Information
Aquatic Living Resources , Volume 22 , Issue 1 , January 2009 , pp. 69 - 77
Copyright
© EDP Sciences, IFREMER, IRD, 2009

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