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The following schedule is subject to change (as of October 11, 2016). Please check back for updates. For more information about this meeting, go to: www.seafwa.org/conferences/2016
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Tuesday, October 18 • 8:20am - 8:40am
Fisheries. Evaluation of Diel Differences in Continuous and Point Abundance Electrofishing in Shallow, Turbid Floodplain Waterbodies

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AUTHORS: Michael D. Kaller, Joshua C. Herron, A. Raynie Harlan, Tiffany E. Pasco, William E. Kelso - School of Renewable Natural Resources Louisiana State University Agricultural Center

ABSTRACT: Published reports indicate night electrofishing may be superior to day sampling to estimate density and diversity of collected fishes. However, shallow, highly turbid waters characteristic of river floodplains present detection, navigation, and safety concerns during night electrofishing, and many southeastern floodplain sampling programs have focused on day electrofishing. To assess potential day electrofishing bias, we collected fishes during continuous (200 m distance for eight minutes) and point abundance electrofishing (1 minute at eight points spaced 25 m apart) during paired day and night efforts at 12 sites in the Atchafalaya River floodplain during 2013. Analyses compared day and night estimates of overall density (CPUE), CPUEs of Bluegill Lepomis macrochirus, Largemouth Bass Micropterus salmoides, Black Crappie Pomoxis nigromaculatus, and assemblage richness and evenness by electrofishing method. General linear mixed models used day or night sample as a fixed effect, turbidity, dissolved oxygen, water depth and specific conductance as fixed covariables, and sampling month as a random effect. We also compared day and night assemblages with redundancy analysis. Point-abundance sampling at night resulted in significantly greater overall (P=0.03) and Bluegill (P=0.03) CPUE, with continuous sampling yielding greater nocturnal richness (P=0.02) and diurnal Largemouth Bass CPUE (P=0.02). No differences were detected for estimates of Black Crappie CPUE, evenness, or between day and night assemblages for either sampling method. Thus, selection of day or night electrofishing may depend on sampling goals, habitat characteristics, particularly turbidity, and the electrofishing method employed.

Tuesday October 18, 2016 8:20am - 8:40am
Riverview A

Attendees (7)