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Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife...

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Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas
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Page 1: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Aquatic Plant Management Options for Caddo Lake

Timothy J. BisterTexas Parks and Wildlife Department

Inland Fisheries District 3AMarshall, Texas

Page 2: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Plan Objectives

• Establish long-term management of nuisance aquatic plants in Caddo Lake

• Maintain a healthy lake ecosystem

• Protect native aquatic habitat

• Maintain access for users

Page 3: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Problematic Species

• Waterhyacinth

• Hydrilla

• Giant salvinia

Page 4: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Mechanical Harvesters

• Limited to water >2 feet deep with few stumps

• Past experience has proven ineffective and cost prohibitive

Page 5: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Triploid Grass Carp

• Effective for control of hydrilla• Not effective for waterhyacinth• Not considered a viable control for giant salvinia• Will eat native species• Would require emigration barrier• Would require agreement between TX & LA

Page 6: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Recommendations• Giant salvinia

– Conduct herbicide treatments• Glyphosate/Diquat mixture

– Physical removal/disposal by trained/permitted volunteers

– Increase public awareness through signs, flyers, and news releases

– Release giant salvinia weevils in areas that become uncontrollable with herbicide

– Conduct annual aquatic vegetation surveys to monitor giant salvinia coverage

Page 7: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Recommendations• Waterhyacinth

– Continue herbicide treatments• 2,4-D• WMA, boat ramps, other access• Supplemental efforts from other entities fully

supported

– Conduct annual surveys (Aug/Sep) to monitor coverage of waterhyacinth

Page 8: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Recommendations• Hydrilla

– Maintain critical boat lanes restricted by hydrilla with herbicide

– Not most critical problem at this time

– Assess hydrilla coverage during annual aquatic vegetation surveys

Page 9: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

Recommendations• Create on-site vegetation control crew

– May to October– Hire private herbicide applicator

• Pursue additional funding – Support spray crew– Purchase herbicide

• Develop long-term plan

Page 10: Aquatic Plant Management Options for Caddo Lake Timothy J. Bister Texas Parks and Wildlife Department Inland Fisheries District 3A Marshall, Texas.

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