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Subject:

Re: Generator-based electrofishing equipment

From:

Jim Reynolds <[log in to unmask]>

Reply-To:

Scientific forum on fish and fisheries <[log in to unmask]>

Date:

Wed, 25 Apr 2018 15:24:29 -0700

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Chris,

I'm unsure if any EU countries make and sell shore-based electrofishing
systems. However, I'm pretty sure that such systems are not sold as
off-the-shelf products in North America (although tow-boat systems are). Of
course, there are several manufacturers who could make such a system for
you, delivered ready to fish. You can also make your system locally by
purchasing an electrofishing control unit made for boats and buying the
parts you need for a DIY project. You may also wish to buy anode poles
ready to fish because these are somewhat complicated and each must have a
safety switch.



These systems are easy to build. You need the control unit, the anodes you
wish to include, the insulated cable and connectors and a 3-5 kW generator
with 240-V output (assuming you really do deal with low-to-high water
conductivity, say, 50 to 1000 uS/cm). Your control unit should deliver up
to 1000 peak volts (pulsed DC) and 20 peak amps. Be sure your anodes are
built to carry high current; most are. Your cathode need be nothing more
than a steel bar or plate, buried in the shoreline to get a good earth
ground. Of course, the anodes must be wired in parallel to avoid one
off-anode shutting down the rest. General guidance for construction (e.g.,
appropriate wire gauges) can be found at nctc.fws.gov. Enter 241 FW 6 in
the search window and download the PDF.



A word of caution: shore-based unit are the most hazardous form of
electrofishing because they combine the high voltage and current of boat
systems with the wading method of backpack systems. Your generator should
have an emergency shutoff switch and should be attended by an observer
during electrofishing operations. Your protocol should include a buddy
system for each anode with a means of communication or line-of-sight for
all buddy pairs.



I hope this is helpful. If you have more questions please contact me
directly. If I can't answer something, I have talented colleagues who can.
~jim




Jim Reynolds
4404 N Winchester Road
Apache Junction, AZ 85119

On Wed, Apr 25, 2018 at 2:00 PM, Chris Harrod <[log in to unmask]> wrote:

> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
> REPLIES WILL BE SENT TO THE FISH-SCI LIST
> <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <><
>
> Folks
>
> If anyone has any recommendations for shore-based generator electrofishing
> kit (multiple anode, for large, low to high conductivity rivers with
> salmonids AND small bodied native fishes), I'd be very keen to hear from
> them.
>
> The market seems to have changed since I was last looking to buy kit!
>
> Cheers
> Chris
>
>
> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><> ><>
> Professor Chris Harrod
> (Fish & Aquatic Ecology)
>
> Email: [log in to unmask]<mailto:[log in to unmask]>
> Twitter: @chris_harrod
> www.harrodlab.net<http://www.harrodlab.net>
> HarrodLab: Fish and Stable Isotope Ecology Laboratory
> Instituto de Ciencias Naturales Alexander von Humboldt,
> Universidad de Antofagasta,
> Avenida Angamos 601, Antofagasta, Chile
> Chile Mobile: +56 9 7399 7792
> Chile Office: +56 55 2637400
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