How to make a voltage gradient probe

A voltage gradient probe is used to measure and map electrical fields produced by electrofishing units. It can be a valuable tool for assessing and standardising electrofishing equipment.

Download the PDF file with detailed DIY instructions.

 

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.

Trouble-shooting equipment

The following description covers basic trouble-shooting tasks that can be performed in the field. Some companies also publish in-depth trouble-shooting guides for testing control boxes and branch circuitry. Always obtain trouble-shooting guides from the manufacturer of your equipment, if available.Continue Reading..

Electrofishing and fish health

spinal-injury-feature

A dorsal view X-ray of a rainbow trout revealing spinal fracture caused by electrofishing (source: N. G. Sharber).

As fish lovers and conservationists, we have a vested interest in maintaining fish health. As fisheries scientists, we have the responsibility of ensuring that our sampling techniques are as ethically transparent and non-invasive as possible. Many of us have moved from passive gear types, such as gill nets, to what are considered ‘less harmful’ methods, such as electrofishing. Continue Reading..

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