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Tuesday, January 30 • 9:00am - 9:20am
SYMPOSIA-07: Evaluation of Standard Sampling in Kansas Reservoirs

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AUTHORS. Jeff Koch, Ben Neely – Kansas Department of Wildlife, Parks, and Tourism; Michael Colvin, Mississippi State University

ABSTRACT. We evaluated the precision of samples and the number of stock-length fish collected by means of standard methods used for sampling North American freshwater fishes from 2010 to 2013 in Kansas. Median RSE of electrofishing samples was generally less than 25% for Largemouth Bass in all sizes of reservoirs and for Channel Catfish in medium (251–1,000 acres) and large reservoirs (greater than 1,000 acres). The RSE estimates were generally >25% for Bluegill and crappies collected in trap nets and palmetto bass and Walleye sampled in gill nets. With few exceptions, 100 stock-length individuals of all target species (e.g., Largemouth Bass, Bluegill, crappies, palmetto bass, Channel Catfish, Walleye) were not sampled at current levels of effort. Resampling procedures indicated that fewer than 20 deployments were usually needed to obtain an RSE 25% and 100 stock-length fish for Largemouth Bass in smaller impoundments; however, more than 20 deployments were needed in larger impoundments. The median effort needed to achieve an RSE 25% for Bluegills and crappies in trap nets varied and may exceed what some biologists find practical. Our results indicate that more samples than are currently prescribed are generally needed to precisely sample sport fishes by means of standardized protocols in Kansas reservoirs. We also used multiple linear regression to determine the relationships between the biological, chemical, and physical characteristics of reservoirs and the number of gear deployments needed to reach two sample objectives.  Recent CPE was identified in N100 models for six target species and in RSE25 models for five. Conversely, reservoir surface area was identified in only one model for N100 and two for RSE25. These results suggest that reservoir characteristics other than surface area, particularly recent CPE, should be considered when developing minimum sample sizes for objective-based fish sampling protocols.

Tuesday January 30, 2018 9:00am - 9:20am CST