AUTHORS: Danielle Shubat, Eastern Illinois University; Daniel Roth, Eastern Illinois University; Robert Colombo, Eastern Illinois University; Eden Effert-Fanta, Eastern Illinois University
ABSTRACT: Channel Catfish (Ictalurus punctatus) are a popular and sought after sportfish to anglers across the United States, having substantial value for both recreational and commercial fisheries. However, their populations in impoundments often rely on stockings of fingerlings. In Illinois, the lack of standardized sampling protocols for catfish has made it difficult to adequately evaluate stocking efforts and assess population dynamics. This study aimed to determine the most effective sampling methods for Channel Catfish in impoundments, assess demographic variation among impoundments, and test the efficacy of artificial spawning structures to increase natural reproduction and recruitment in three Illinois reservoirs (Lake Charleston, Lake Mattoon, and Lake Paradise). After two years of seasonal sampling using multiple gears, we found that baited tandem hoop-nets in the fall yielded the best catch rates and we will continue to use this sampling method. Our population assessments and microchemistry analyses of pectoral spines show that Channel Catfish in these lakes are primarily stocked fish, suggesting low natural reproduction. However, the relationship between stocking rates and the observed differences in population density and demographics remains unclear. We hypothesized that the lack of recruitment may be due to insufficient spawning habitat and sought to increase availability of this habitat by adding nest boxes in the study lakes. Preliminary trials showed that Channel Catfish used these structures, and future goals include expanding nest box installations and monitoring for natural recruitment over time. Adding nest boxes to create suitable habitat for these catfish to reproduce may facilitate annual recruitment thereby reducing cost and effort of hatchery operations. If successful, this approach could be implemented in other lakes and ponds to naturally sustain catfish populations.
