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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 • 11:00am - 11:20am
Fisheries. Age, Growth, and Mortality of Black Bass in Three North Georgia Reservoirs

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AUTHORS: John T. Perry, University of Georgia; Brian J. Irwin, U.S. Geological Survey; Timothy F. Bonvechio, Georgia Department of Natural Resources; Patrick M. O'Rouke, Georgia Department of Natural Resources

ABSTRACT: In the southeastern U.S., black bass (Micropterus spp.) are widely targeted by anglers, and these species potentially intermix and compete for resources. We evaluated the relative abundance, age and size structures, length-weight and length-at-age relationships, and annual mortality rates for angler targeted bass populations in 3 north Georgia reservoirs: Lakes Lanier, Chatuge, and Nottely. Fish were collected by electrofishing, and individuals were measured (total length, mm) and weighed (g). Data were grouped as either Largemouth Bass (M. salmoides) or Spotted Bass (M. punctulatus), although genetic information remains incomplete. Electrofishing catch per effort (number of fish/hour) of Spotted Bass was highest in Chatuge (50.2 + 5.1; + S.E.), intermediate in Nottely (43.2 + 5.9), and lowest in Lanier (25.2 + 5.2 fish). Largemouth Bass catch per effort was higher in both Chatuge and Lanier (29.6 + 8.4 and 29.5 + 6.4, respectively) than in Nottely (11.8 + 1.2). Length-weight relationships were similar for Spotted Bass across reservoirs. Based on von Bertalanffy models fit to the available data, the highest estimate for theoretical maximum length-at-age was for Spotted Bass from Nottely, but this reservoir also had the smallest proportion of larger individuals (i.e., total length ≥ 356 mm). Likewise, the age and size structures of Lake Nottely Spotted Bass were more skewed towards younger and smaller fish than for Chatuge or Lanier. For all three systems, annual mortality estimates for Spotted Bass were near 0.4. In Lake Lanier, Spotted Bass had a higher estimate of annual mortality than Largemouth Bass (approximately 0.25).

Tuesday October 18, 2016 11:00am - 11:20am
Riverview A

Attendees (5)