Comparison of efficiency of different electrofishing techniques
for juvenile fish estimates on river beaches

a 2004

Comparison of efficiency of different electrofishing techniques for juvenile fish estimates on river beaches

JANÁČ, Michal a Pavel JURAJDA

Základní údaje

Originální název

Comparison of efficiency of different electrofishing techniques for juvenile fish estimates on river beaches

Název česky

Porovnání účinnosti různých technik elektrolovu 0+ juvenilních ryb na říchních plážích

Autoři

JANÁČ, Michal a Pavel JURAJDA

Vydání

European Congress of Ichthyology /11./. 06.09.2004-10.09.2004, Tallinn, 2004

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10600 1.6 Biological sciences

Stát vydavatele

Estonsko

Utajení

není předmětem státního či obchodního tajemství

Označené pro přenos do RIV

Organizační jednotka

Přírodovědecká fakulta

ISBN

9985-4-0396-7

Klíčová slova anglicky

juvenile fish

Změněno: 4. 12. 2009 16:28, Mgr. Michal Janáč, Ph.D.

Anotace

V originále

The efficiency of three different techniques (direct electrofishing, throwing the anode, remote electrofishing) for 0+ point abundance sampling by electrofishing was tested on gravel beaches of the Morava River during August 2003. During direct electrofishing, the operator personally imerses anode fastened on an extension pole. During throwing , anode is thrown at a distance from the bank. During remote electrofishing, the prepositioned andoe is activated after fish recolonize the area. All threee techniques yielded significantly different assemblage structures (in terms of relative abundances of most abundant species). Both direct electrofishing and throwing the anode disturbed fish and that fish tend to escape, thereby reducing efficiency of these techniques (they were only 30% as efficient as remote electrofishing). For species inhabiting the upper layer of the water column (mainly bleak), throwing the anode seemed to be more efficient than direct electrofishing. Remote electrofishing proved to be the most suitable technique for sampling juvenile fish at river beaches. It was the most effective technique and it yielded significantly more species per locality than other two techniques, Higher time consumption, which is caused by higher number of fish caught, may be its only constrain in monitoring surveys, however it is negligible in conparison with its benefits.

Návaznosti

AV0Z6093917, záměr

Název: Výzkum rozmanitosti forem organizace a funkcí volně žijících obratlovců a jeho využití pro strategii ochrany a setrvalého využívání přírodních zdrojů

Citovat

JANÁČ, Michal a Pavel JURAJDA. Comparison of efficiency of different electrofishing techniques for juvenile fish estimates on river beaches. In European Congress of Ichthyology /11./. 06.09.2004-10.09.2004, Tallinn. 2004. ISBN 9985-4-0396-7.

@proceedings{857888,
   author = {Janáč, Michal and Jurajda, Pavel},
   booktitle = {European Congress of Ichthyology /11./. 06.09.2004-10.09.2004, Tallinn},
   keywords = {juvenile fish},
   language = {eng},
   isbn = {9985-4-0396-7},
   title = {Comparison of efficiency of different electrofishing techniques for juvenile fish estimates on river beaches},
   year = {2004}
}

TY  - CONF
ID  - 857888
AU  - Janáč, Michal - Jurajda, Pavel
PY  - 2004
TI  - Comparison of efficiency of different electrofishing techniques for juvenile fish estimates on river beaches
SN  - 9985403967
KW  - juvenile fish
N2  - The efficiency of three different techniques (direct electrofishing, throwing the anode, remote electrofishing) for 0+ point abundance sampling by electrofishing was tested on gravel beaches of the Morava River during August 2003. During direct electrofishing, the operator personally imerses anode fastened on an extension pole. During throwing , anode is thrown at a distance from the bank. During remote electrofishing, the prepositioned andoe is activated after fish recolonize the area. All threee techniques yielded significantly different assemblage structures (in terms of relative abundances of most abundant species). Both direct electrofishing and throwing the anode disturbed fish and that fish tend to escape, thereby reducing efficiency of these techniques (they were only 30% as efficient as remote electrofishing). For species inhabiting the upper layer of the water column (mainly bleak), throwing the anode seemed to be more efficient than direct electrofishing. Remote electrofishing proved to be the most suitable technique for sampling juvenile fish at river beaches. It was the most effective technique and it yielded significantly more species per locality than other two techniques, Higher time consumption, which is caused by higher number of fish caught, may be its only constrain in monitoring surveys, however it is negligible in conparison with its benefits.
ER  -

JANÁČ, Michal a Pavel JURAJDA. Comparison of efficiency of different electrofishing techniques for juvenile fish estimates on river beaches. In \textit{European Congress of Ichthyology /11./. 06.09.2004-10.09.2004, Tallinn}. 2004. ISBN~9985-4-0396-7.

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