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Earl W. Chilton II, Ph.D. Texas Parks & Wildlife
Austin, Texas
Invasive Exotic Aquatic and Wetland Species Update
Zebra Mussels in Texas
U.S. Distribution Over Time
Two confirmed public reservoir and one creek
Two watersheds to date
Lake Texoma
Lake Ray Roberts
Zebra mussel Dreissena polymorpha
Lionfish
Tiger Prawn
• Found in 60-100 feet of water • Eat small bivalves • Carry 16 known diseases • Diseases are transferrable
Lake Austin
Hydrilla in Lake Austin
0
100
200
300
400
500
600
Jul-99 Jul-01 May-03 May-04 Feb-05 Nov-05 Mar-07 Sep-08 Aug-10 Oct-11 Feb-13
Acr
es
Date
Triploid grass carp stocked: 2003-2010 16,200 2011 13,200 2012 17,369
Salvinia molesta
6,000-13,000 acres
Giant salvinia
Spread from 1-23 water bodies in 14 years
Toledo Bend
Caddo Lake Mature giant salvinia
Toledo Bend
Water hyacinth Eichhornia crassipes Approximately 35
public water bodies
6,000 - 14,000 acres, 14 watersheds
Llano River
Chinaberry Giant reed
Elephant ear
Elephant ear
Texas Pollutant Discharge Elimination System
• On November 2, 2011 TCEQ approved a TPDES General Permits that Texas residents must adhere to
• A Certificate of Coverage was issued by TCEQ on March 9, 2012 certifying that TPWD is covered under the new TPDES General Permit.
• Compliance under the TPDES General Permit will require increased reporting, increased record keeping, and increased survey frequency.
• TPWD Staff have developed an automated record keeping and reporting system.
FY 2012 Invasive Plant Treatments (acres)
0 50000
100000 150000 200000 250000 300000 350000
LA FL TX
Infested
Treated
Expenditures for Treating Aquatic Vegetation
(Millions $)
0
5
10
15
20
25
2009 2010 2011 2012 2013
FL
LA
TX
*
Thank You!
