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>===== Original Message From Scientific forum on fish and fisheries
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>But isn't the idea of a closed containment system that there is no
>contamination of the surrounding water? Do electrofishing tanks
accomplish
>that?
>
>FWP
>
In my experience, no one has ever used a closed holding tank while
electrofishing just to avoid contamination of the water body. The fish and
water  in the tank are from the water body itself and would not be a source
of contamination other than diseases or toxins already contained therein.
If the tank itself was a source of pathogens or toxins, there is a bigger
issue to deal with than the one of closed vs open tank systems!

Closed systems are usually used in electrofishing because the tanks are
small and can be easily aerated (fish are usually not held for very long so
a large tank is generally not needed). However, electroshock is stressful
and a poor holding environment makes recovery even more difficult.
That's why I always recommend a flow-through system with at least a
partially-closed lid; you get ambient temp and oxygen while providing
"cover" to help the fish recover.





Dr. James B. Reynolds
Emeritus Professor of Fisheries
School of Fisheries and Ocean Sciences
University of Alaska Fairbanks
P.O. Box 757220
Fairbanks, Alaska 99775

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