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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 • 2:20pm - 2:40pm
Fisheries. Movement and Growth of Wild Brown Trout in the Chattahoochee River Below Lake Lanier, Georgia

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AUTHORS: Patrick O'Rouke, Georgia Wildlife Resources Division (Current affiliation, Georgia Power Company)

ABSTRACT: The Georgia Wildlife Resources Division (WRD) performed a tagging study from April 2011 to May 2012 to study the growth of wild brown trout in the Lanier Tailwater section of the Chattahoochee River. Sampling occurred monthly at four sites and fish were tagged through March 2012 for subsequent recapture. Finer-scale samples later in 2012 confirmed a lack of movement between sites by any tagged brown trout that was seen in the previous samples. Growth increments between tagging and recapture events were calculated and used to estimate average length at age. Brown trout appear to initially grow rapidly and reach stock size (200-260 mm) within two years. However, it can take more than ten years for the average brown trout to reach 300 mm TL based on calculated von Bertalanffy growth curves. More than 80% of brown trout collected measured between 175 and 275 mm TL. Some individuals did display much faster growth rates which could only partially be explained by obvious variables such as seasonality, location, or size. The strong decline in growth rate among larger fish is potentially a result of limited forage in a relatively unproductive river, while the individual variability between similar fish may be a result of behavior (e.g. a transition to piscivory).

Tuesday October 18, 2016 2:20pm - 2:40pm
Riverview A

Attendees (4)