Which of the following species are commonly targeted during electrofishing surveys?

Trout and bass are commonly targeted during electrofishing surveys primarily due to their ecological significance and popularity among anglers. These species are often found in freshwater habitats, where electrofishing is widely applied as an effective sampling method for assessing fish populations and their health within a given water body.

Electrofishing allows researchers and fisheries managers to gather valuable data on the abundance, size distribution, and species composition of fish populations. Trout and bass, being high-value species in recreational and sport fishing, are often the focus of these studies. Their presence indicates the quality of the aquatic environment and can help assess habitat restoration efforts or the impact of environmental changes.

In contrast, while catfish and eels may sometimes be sampled, they are not typically the primary focus of electrofishing surveys. Sharks and tuna are generally found in marine environments, which are not the target areas for this freshwater technique. Goldfish and koi, while they may be caught during electrofishing, are often associated with ornamental fish ponds rather than the type of ecosystems that researchers typically survey for ecological studies. Thus, trout and bass represent the standard target species due to their significance in fisheries management and freshwater ecology.