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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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Wednesday, October 19 • 10:40am - 11:00am
Fisheries. Lake Bistineau: A Case Study of Managing Giant Salvinia (Salvinia molesta) in a Lowland, Swamp Reservoir

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AUTHORS: Jeff Sibley, Louisiana Department of Wildlife and Fisheries

ABSTRACT: Lake Bistineau is an aging, shallow, eutrophic impoundment located in northwest Louisiana. There are more than 1,000 homes along the shoreline, and it is a popular destination for outdoor recreation. Vegetation problems have plagued the lake since it was first created in 1938. These vegetation issues combined with dense stands of cypress trees and a large watershed have contributed to an overabundance of non-decomposing organic material on the lake bottom which contributed to a decline in sportfish populations. The management of aquatic resources within Lake Bistineau were further complicated by the discovery of giant salvinia (Salvinia molesta) in 2006. Early efforts to control giant salvinia included physical removal and foliar herbicide applications to the scattered plants. Giant salvinia weevils (Cyrtobagous salviniae) were introduced in 2007. Personnel from across the state assisted with control efforts prior to hiring additional local personnel. Despite these efforts by the Louisiana Department of Wildlife and Fisheries, the plants continued to expand covering 7,386 acres by September of 2009. Public outcry to the deteriorating conditions on the lake was tremendous. An integrated vegetation management strategy has been adopted that includes strategic herbicide applications, weevil stockings, water level fluctuations and an increased focus on public education. The strategy is designed to reduce vegetation levels while maximizing the recreational use of the lake and simultaneously slowing the eutrophication process. Since 2010, salvinia has been held in check to an average, annual, maximum coverage of 1,863 acres. Additionally, sportfish populations have responded positively to the frequent water fluctuations.

Wednesday October 19, 2016 10:40am - 11:00am
Riverview A

Attendees (8)