In early 2016, I published a paper, “Spheres, rings and rods in electrofishing: Their effects on system resistance and electrical fields” (Transactions of the American Fisheries Society 145:239-248, 2016). My aim was to elucidate the relative importance of size and shape of common electrodes in determining electrical resistance of electrofishing systems and the intensity and size of the electrical fields they produce. In that paper, I did not cover the relationship of electrode surface area to resistance; instead, I am reporting that information in this blog.
On behalf of a fish biologist who wishes to remain anonymous, we are publishing this blog. The biologist has an implanted heart pacemaker and faced concerns about participation in electrofishing operations. The text has been authored in first person and lightly edited by us with approval by the author. We believe that this factual investigation will provide useful information to employees and supervisors alike.
~Colleen Caldwell, New Mexico Cooperative Fish and Wildlife Research Unit and Jim Reynolds, Alaska Cooperative Fish and Wildlife Research Unit (retired)