Abstract
This study aimed to describe the influence of different electrofishing engine configurations on electric field dispersion in water. Several experiments with original results are included. The aims were to (i) assess the equivalent electrode resistances and the output voltage at the anode, (ii) assess the influence of electrode misuse on the dispersal of the electric field in water, (iii) assess the influence of the duty cycle and the frequency on the radius of attraction around the anode, and (iv) set the voltage and the duty cycle based on information from models for backpack and bankside electrofishing engines. A synthesis of equivalent electrode resistances from different studies was created. Using an oxidised anode induced a decrease in the radius of attraction. Frequency had no influence on the radius of attraction, in contrast to the duty cycle. Models including the voltage and the duty cycle were created to enable the configuration of electrofishing engines.
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Acknowledgements
We thank Yoann Bennevault, Yohann Clermont-Ledez, Maïra Coke, Jean-Pierre Destouche, Omar Diouach, Bernard Joseph, Dominique Huteau, Adrien Oger, Pablo Rault, Bastien Sacré, Coralie Sauvadet, and Quentin Texier for their assistance when measuring the electrical outputs. Thanks to Francis Lorieau, Sandro Parusatti, and Nicolas Roset for lending us new engines and for their assistance during the tests.
Funding
This work benefited, using the PEARL platform of INRA (1036, U3E), the support of the ANR via the “Investments for the future”, the National Infrastructure in Health Biology “ANAEE-Services” (ANR-11-INBS-0001) and financial support from the AFB INRA Gest’Aqua pole.
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Highlights
• This study aimed to describe the influence of different electrofishing engine configurations on electric field dispersion in water. Several experiments with original results are included.
• Values of equivalent electrode resistances from different studies were combined in a synthetic table in order to facilitate their use in calculations when using different configurations of electrofishers.
• The influence of the anode oxidation was assessed: using an oxidised anode induced a decrease in the radius of attraction.
• The dispersal of the electric field in water was assessed: it was influenced by the output voltage at the anode and by the duty cycle.
• Models of the dispersal of the electric field in water were created for backpack and bankside electrofishing engines.
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Pottier, G., Marchand, F. & Beaulaton, L. A comprehensive guide to set up correctly an electrofishing gear. Environ Monit Assess 192, 22 (2020). https://doi.org/10.1007/s10661-019-8000-4
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DOI: https://doi.org/10.1007/s10661-019-8000-4