Rarely does a new model electrofisher hit the market, so it is fortunate to be able to evaluate it in some respects. The first backpack electrofisher we bought at a federal fish hatchery for capturing possible mussel host fish was an Appalachian Aquatics AA-24. It had multiple voltage ranges, but the waveform was fixed at 120 Hz pulsed direct current with a duty cycle that varied slightly with load from about 73 to 80 percent. Despite the fixed frequency and duty cycle, it captured fish well. It was sturdily made, and I understand those units are still operating after 15 years of service. One day, we had the opportunity to use the AA-24 at the same stream as an ETS ABP-3 and a Smith-Root LR-24. As I recall, the ambient water conductivity was about 40 μS/cm, so we set each unit to 400 volts and began shocking. All three units successfully captured small stream fish, and we saw in this short comparison no real differences in fish catch among the three units.
© 2015 Thread One Page. Imagery: Tom Rayner, Alan temple, Richard Pearson, Paul Godfrey, Roger Scott, John Rayner.