Use of vehicle counters to index and evaluate potential shifts in angler effort following implementation of more restrictive panfish regulations in Wisconsin lakes.

This article evaluates the use of vehicle counters as a cost-effective, remote method to index angler effort and examines angler responses to the implementation of more restrictive panfish harvest regulations across Wisconsin lakes. Validation studies showed that vehicle counts significantly correlated with traditional measures of angler effort, such as angler-hours and number of angling parties, explaining 57–84% of variation depending on the method and lake. A case study across multiple lakes implementing different panfish regulations found no systematic redistribution of angler effort away from lakes with more restrictive regulations toward those with less restrictive or reference regulations. The findings suggest that vehicle counters, when properly validated at the lake level, can serve as a useful tool for broad-scale monitoring of angler effort and support localized implementation of specialized panfish regulations without concern for large-scale angler displacement.