SEAFWA 2018 has ended
The following schedule is from the 72nd Annual Conference of the Southeastern Association of Fish & Wildlife Agencies which was held October 21-24, 2018 in Mobile, Alabama. 
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Tuesday, October 23 • 4:00pm - 4:20pm
Fisheries 3 Track: Relative Abundance, Habitat Use, and Diet of the Sickle Darter (Percina williamsi)

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AUTHORS: Brian Alford, Meredith Harris, Cory Chapman, Kyler Hecke – University of Tennessee-Knoxville

ABSTRACT: During summer 2016-18, we surveyed historic and new sites within the range for the ESA-petitioned Sickle Darter (Percina williamsi). Using snorkeling, backpack electroshocking, and seining techniques, relative abundance was measured as catch per unit effort and density. Snorkeling was determined to be the most effective sampling technique, and relative abundance was greater for the Emory River population for Little River. In Little Rock Creek (tributary to Emory), the dominant two substrates used by individuals were sand then boulder, whereas in Emory River and Little River it was gravel followed by sand. Sickle Darters were observed in low-gradient areas of streams, almost entirely in pool habitats (mean depth was 41-51 cm) with mean current velocities measuring 0.5-0.6 m/s (timed neutrally bouyant object method). Canopy cover of riparian vegetation measured in the stream by a densiometer averaged 82% at Emory River darter locations, 35% at Little River, and 90% at Little Rock Creek. Water quality was considered good at all sites, with total dissolved solids (TDS) less than 63 ppm at all sites. Sickle Darters were almost always found along channel margins containing beds of aquatic vegetation and small woody debris (SWD) for cover. The most common prey from 28 fish were larval Chironomidae (65% occurrence, 48% composition by number) followed by mayfly larvae (54% occurrence, 45% composition by number). Prey use did not differ by body size, but Emory River fish consumed proportionately more chironomids than mayflies (mostly Heptageniidae), whereas the opposite was observed for Little River fish.

Tuesday October 23, 2018 4:00pm - 4:20pm CDT
Bon Secour Bay I

Attendees (5)