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Subject:

Re: Generator-based electrofishing equipment

From:

Chris Harrod <[log in to unmask]>

Reply-To:

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

Date:

Thu, 26 Apr 2018 21:43:09 +0000

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Hi Jim

Thanks for the long and detailed reply - I appreciate the time taken to respond to my question.

I used to work for the Environment Agency of England and Wales and we used shore-based generator-powered systems that worked really well in medium sized rivers.
I had the health and safety side of things drilled into me and must admit hadn't thought of a DIY approach (I'm ok with mechanics, but electrics make me a bit nervous, especially when mixed with H2O!). From what I can see the European manufacturers have been taken over by Smith-Root...

Alan Temple has kindly emailed me the link to the latest version of the FWS guidance document https://www.fws.gov/policy/241fw6.pdf

So, I'll be doing some reading and let's see where we end up!

Cheers again

Chris

-----Original Message-----
From: Scientific forum on fish and fisheries <[log in to unmask]> On Behalf Of Jim Reynolds
Sent: 25 April 2018 19:24
To: [log in to unmask]
Subject: Re: Generator-based electrofishing equipment

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           REPLIES WILL BE SENT TO THE FISH-SCI LIST <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <>< <><

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
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