Inter-calibration of three electric fishing techniques to estimate 0+ juvenile fish densities on sandy river beaches.

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Authors

JANÁČ Michal JURAJDA Pavel

Year of publication 2005
Type Article in Periodical
Magazine / Source Fisheries Management and Ecology
MU Faculty or unit

Faculty of Science

Citation
Field Ecology
Keywords electric fishing; 0+ juvenile fish; point abundance sampling
Description The efficiencies of three different techniques for 0+ fish point abundance sampling by electric fishing were tested on a sandy beach of the Morava River. During direct electric fishing (DE), the operator immerses an anode fastened on an extension pole. During thrown anode electric fishing (TE), the anode is thrown at a distance from the bank. During remote electric fishing (RE), a pre-positioned anode is activated after allowing sufficient time for fish to recolonise the area. The DE technique was found to disturb fish and that fish tend to escape, thereby reducing its efficiency (30% of efficiency of RE). There was no significant difference in relative abundance estimates or size structure of assemblages between DE and RE, but TE seemed overestimate relative abundance of bleak. RE was the most efficient technique and if time required for deployment could be reduced, it would be also the most suitable for monitoring 0+ fish assemblages on sandy river beaches.
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