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Wednesday, January 30 • 10:40am - 11:00am
(FISHERIES: TECHNIQUES) Use of Lake Michigan and Indiana Standard Trap Nets to Collect Crappie: A Comparison of Catch, Size Structure, and Cost Effectiveness

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AUTHORS: Andrew Bueltmann, Sandra Clark-Kolaks – Indiana Department of Natural Resources

ABSTRACT: Two entrapment gears, the Indiana Standard trap net (INS) and the Small Lake Michigan trap net (LM), were compared to evaluate which was more efficient and more cost effective for collecting Crappie. Gears were deployed randomly at four total lakes, one in 2017 and three in 2018. Efficiency was measured by effort needed to collect a similar sample size between gears along with time required to run both nets. Further, cost effectiveness was measured by the individual cost of both nets and the number of cheap nets which could be purchased for the more expensive net. Specifically, a single LM costs ~$4,500 and a single INS costs ~$500; therefore, nine INS could be purchased for one LM. Cost effectiveness was then calculated as the ratio of estimated catch:estimated labor time to run the necessary number of nets so that individual costs were equivalent (i.e., one LM to nine INS). The larger the ratio, the more cost effective the gear type. All lake data were pooled for analysis and indicate that size distribution between nets does not differ and mean overnight catch rates were nearly triple the amount higher for LM (14.8) than INS (5.6). Further, labor time required to achieve equivalent catch rates were as follows: one LM net (~9.8 to 60.4 mins to run) to three INS nets (~10.5 to 58.8 mins to run). Although mean overnight catch rate was higher for LM, cost effectiveness indicates little to no difference between the gears with INS (0.7) being slightly more cost effective than LM (0.5).

Wednesday January 30, 2019 10:40am - 11:00am

Attendees (3)