Ice-fishing handling practices and their effects on the short-term post-release behaviour of Largemouth bass

Numerous studies have investigated the impacts of catch-and-release on the post-release behaviour of fish during periods characterized by warm air and water temperatures. Comparatively little is known about the post-release behaviour of fish caught while ice fishing. Largemouth bass (LMB), a popular sportfish in North America, is sometimes encountered during ice fishing and is often released due to angler conservation ethic or to comply with regulations. To examine the impacts of ice angling on the post-release behaviour of LMB, we exposed them to a range of handling practices and assessed their skin temperatures prior to release, as well as short-term postrelease swimming activity using biologgers equipped with a tri-axial accelerometer, temperature and pressure sensors. Skin temperature of LMB had a significant positive relationship with windchill temperature. Generally, the longer that LMB were exposed to air or placed on the ice, the colder their skin became. Overall, water depth and water temperature selected by LMB increased with time during the post-release period. Overall dynamic body acceleration (ODBA), a proxy for locomotory activity, decreased as time progressed in the release period, while ODBA decreased with increasing depth and water temperatures. LMB with warmer skin temperatures had lower locomotory activity compared to those with colder skin temperatures. Further, the effect of skin temperature on locomotory activity became more amplified with increasing depth and warming water temperatures selected by LMB post-release. Anglers practicing catch-and-release angling during the winter should adopt best handling practices by reducing the time fish are removed from the water when windchill temperatures are subfreezing to avoid alteration in post-release behaviour.

Automated summary

Research has shown that the post-release behavior of largemouth bass caught during ice fishing is influenced by various handling practices, including exposure to air or placement on ice that can lead to lower skin temperatures. After release, largemouth bass tend to select deeper water with increasing water temperatures and exhibit reduced locomotory activity over time. Skin temperature has a significant impact on locomotory activity, with fish having warmer skin temperatures showing lower activity, especially in deeper and warmer water conditions post-release. Anglers practicing catch-and-release during winter should consider minimizing fish exposure to subfreezing temperatures to avoid alterations in their behavior after release.