What is your electrofisher ammeter telling you? The obvious answer is that it is indicating amperes of electrical current flow, the movement of electrical charges past a point or surface. But not all electrofisher ammeters display the same measure of current, and that can and does lead to confusion.
Sometimes, things just don’t work as expected. You go to a new sampling site, determine ambient water conductivity, estimate a good starting point for standardizing by power and conduct a quick pretrial to fine tune the voltage, current or power levels for successful fishing. But, either the starting point is incorrect, or the sampling begins successfully and then something changes to reduce effectiveness. Below are three examples of unusual circumstances in electrofishing. Two of these were my direct experiences; the other was reported to me.Continue Reading..
Fisheries biologists are knowledgeable about fish, their habitat and about ways to collect fish using a variety of gear and techniques. Many are less familiar with the electrical terms which are used in fish capture using electricity. This blog is meant to explain electrical terms which are used in electrofishing classes and in the literature.