Instructional Video Links

There are a number of useful instructional videos housed on a server at the National Conservation Training Center (U.S. Fish & Wildlife Service).  The videos, while still valid, are a few years old now, and likely will be updated or supplemented in the next year or two.

Some of these videos are the same as those housed in Vimeo with links listed elsewhere on  Depending upon your connection, the Vimeo versions may have better resolution.  However, to access videos on this list, you don’t need an account or password.

Continue Reading..

Are Captured Fish in Minnow Traps Safe from Electroshock?

While instructing an electrofishing short course in early 2017, I was asked if electrofishing near minnow traps containing fish would be harmful to them. When I asked “Why do that?”, I was told that electrofishing and trapping crews, in this case, work separately but in the same areas and often at the same time. To the question I said, “It depends on the material of construction. Minnow traps made of metal mesh are Faraday cages, but those made of non-metals are not. A Faraday cage in an electric field should protect the fish because there would be no voltage gradient (change in voltage over distance) inside.” If you were in a car struck by lightning, it’s not the tires that offer protection; it’s the metal shell you’re in. Even though a metal-mesh trap has holes in it, the mesh, if small enough, would divert the field over the trap exterior.

However, my curiosity got the best of me and I decided to test the theory. Continue Reading..

How to use a backpack unit

Dr Alan Temple introduces the key concepts and methods of operating various backpack electrofishing units.

Boat electrofishing safety

Dr Alan Temple introduces the key concepts and methods of assessing the safety of boat electrofishing units.

How to trouble-shoot a backpack unit

In this video, Alan Temple describes how to use a multimeter to trouble-shoot a malfunctioning backpack unit.

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© 2015 Thread One Page. Imagery: Tom Rayner, Alan temple, Richard Pearson, Paul Godfrey, Roger Scott, John Rayner.