Inter-calibration of three electric fishing techniques to estimate 0+ juvenile fish densities on sandy river beaches.
| Authors | |
|---|---|
| Year of publication | 2005 |
| Type | Article in Periodical |
| Magazine / Source | Fisheries Management and Ecology |
| MU Faculty or unit | |
| 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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