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Initial Information Gathering / Action   Plan for Lake Conroe Preparedness                        July 21, 2010
   On April 3, 2009, the first adult zebra mussel    in Texas waters was confirmed living in Lake    Texoma. Invasive zeb...
   The zebra mussel (Dreissena polymorpha) and    quagga mussel (Dreissena rostriformis    bugensis),collectively referre...
   Are the only freshwater mussels that attach to surfaces   Can colonize the insides of pipelines and restrict the flow...
View of exposed zebra mussels at a Kansas reservoir after a lake drawdown.(Photo: Jason Goeckler, KS Department of Wildlif...
   January 28, 2010 TPW Commission Meeting    ◦ Brian Van Zee discusses Zebra Mussels      Transcript       http://www.t...
   Zebra Mussels in Texas: Assessment of    relative risks to fishery resources,    recommendations for action, and    ex...
   July 19, 2010 Palms Marina Owner reported    Zebra Mussels on a Dry-Docked, NOT-    SEAWORTHY vessel that arrived from...
   Dreissenid mussel densities throughout the    West could vary widely depending on water    chemistry, food availabilit...
   North American zebra mussel populations require    10 mg Ca2+/l to initiate shell growth and 25mg    Ca2+/l to maintai...
   Dreissenids can tolerate a wide range of water    temperatures from roughly 32F to 86F (Ohio Sea    Grant 1997).   Sp...
   Larval development is inhibited at pH of 7.4   Optimal larval survival occurs at a pH of 8.4   Higher rates of adult...
VARIABLES             HIGH        MODERATE           LOW           VERY LOWDissolved Oxygen       8 – 10             6–8  ...
   Spawn 1-2 times/season   Spawn from 54° to 80° F   Become stressed at 86o F, die within a few    weeks.   Die withi...
They like warm water!  Some spawning in water over 89o F for 2-3 months.  Surviving in water over 90o F for several week...
   Adopt TPWD “Recommendations for Action” as    Initial SJRA Action Plan    ◦ Direct control efforts toward Prevention  ...
   Public Awareness Campaign    ◦ Partner w/ TPWD in:      Community Outreach Efforts        Posters        Fliers    ...
   Research    ◦ Potential Control or Containment Measures    ◦ Investigate Potential Surface-Water Intake Structure     ...
   100th. Meridian Initiative    ◦ http://www.100thmeridian.org/   Aquatic Nuisance Species Task Force    ◦ http://www.a...
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
Lake conroe zebra mussels action plan
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Lake conroe zebra mussels action plan

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Lake conroe zebra mussels action plan

  1. 1. Initial Information Gathering / Action Plan for Lake Conroe Preparedness July 21, 2010
  2. 2.  On April 3, 2009, the first adult zebra mussel in Texas waters was confirmed living in Lake Texoma. Invasive zebra mussels were also found in a stream that feeds into Lake Lavon. Experts fear they could eventually spread throughout the Red and Trinity River systems as well as much of Texas. Texas Invasives.org
  3. 3.  The zebra mussel (Dreissena polymorpha) and quagga mussel (Dreissena rostriformis bugensis),collectively referred to as Dreissenids are among the most devastating aquatic nuisance species to invade North American fresh waters Western Regional Panel (WRP) for the Aquatic Nuisance Species Task Force (ANSTF)
  4. 4.  Are the only freshwater mussels that attach to surfaces Can colonize the insides of pipelines and restrict the flow of water Can damage boat hulls, plug water systems used in boat motors Can result in costly mitigation expenses Can cause declines in populations of fish, birds and native mussel species
  5. 5. View of exposed zebra mussels at a Kansas reservoir after a lake drawdown.(Photo: Jason Goeckler, KS Department of Wildlife & Parks)
  6. 6.  January 28, 2010 TPW Commission Meeting ◦ Brian Van Zee discusses Zebra Mussels  Transcript http://www.tpwd.state.tx.us/business/feedback/meeti ngs/2010/0128/transcripts/public_hearing/index.pht ml  Audio http://www.tpwd.state.tx.us/business/feedback/meeti ngs/2010/0128/agenda/
  7. 7.  Zebra Mussels in Texas: Assessment of relative risks to fishery resources, recommendations for action, and expectations for the future TPWD – Inland Fisheries Division, Heart of the Hills Fisheries Science Center http://texasinvasives.org/resources/publications/TPWD_ZebraMussels_in_Te xas.pdf
  8. 8.  July 19, 2010 Palms Marina Owner reported Zebra Mussels on a Dry-Docked, NOT- SEAWORTHY vessel that arrived from Lake Texoma July 21, 2010 SJRA inspected and quarantined the vessel
  9. 9.  Dreissenid mussel densities throughout the West could vary widely depending on water chemistry, food availability, and breeding population Chemistry ◦ Calcium ◦ Temperature ◦ PH ◦ Other Western Regional Panel on Aquatic Nuisance Species
  10. 10.  North American zebra mussel populations require 10 mg Ca2+/l to initiate shell growth and 25mg Ca2+/l to maintain shell growth. Large populations of zebra mussels are not expected where calcium levels are less than 25 mg/l (Hincks and Mackie). Cohen and Weinstein (2001) found little evidence that zebra mussels can become established at ambient calcium concentrations below about 20mg/l. It should be noted that calcium may be elevated near concrete structures (Cohen and Weinstein 2001).
  11. 11.  Dreissenids can tolerate a wide range of water temperatures from roughly 32F to 86F (Ohio Sea Grant 1997). Spawning will not generally occur at temperatures below about 12C (Claudi and Mackie 1994). There is evidence, however, that quagga mussels in deep waters of the Great Lakes are capable of spawning at temperatures near 5C (Roe and MacIsaac 1997) and 9C (Claxton and Mackie 1998)
  12. 12.  Larval development is inhibited at pH of 7.4 Optimal larval survival occurs at a pH of 8.4 Higher rates of adult survival occur at a pH of 7.0-7.5 Optimal adult growth occurs at pH 7.4-8.0 (Benson and Raikow 2007)
  13. 13. VARIABLES HIGH MODERATE LOW VERY LOWDissolved Oxygen 8 – 10 6–8 4–6 <4(ppm)Water 18/64 – 16/61 – 18/64 9/48 – 25/77 <8/46Temperature (C/F) 25/77 25/77 – 28/82 28/82 –30/86 >30/86Total Hardness 90 – >125 45 – 90 25 – 45 <25(mg CaCO3/l)Calcium (ppm) 25 – 125 20 – 25 9 – 20 <9pH 7.5 – 8.7 7.2 – 7.5 6.5 – 7.2 <6.5 8.7 – 9.0 >9.0Salinity (ppt) 0–1 1–4 4 – 10 10 – 35Conductivity 83 – >110 37 – 82 22 – 36 >22(m Siemens)Turbidity (secchi 40 – 200 20 – 40 10 – 20 <10disk cm) 200 – 250 >250Water Velocity 0.1 – 1.0 .09 – 0.1 .075 - .09 <.075(m/sec) 1.0 – 1.25 1.25 – 1.5 >1.5From European & North American Sources C.O’Neill, NY Sea Grant,Mar 96
  14. 14.  Spawn 1-2 times/season Spawn from 54° to 80° F Become stressed at 86o F, die within a few weeks. Die within 5 hours at 90o F. Grow @ 3mm/mo w/ @ 1 cm per year. Filter 1 liter of water per day. Everett Laney, US Army Corp of Engineers, Tulsa
  15. 15. They like warm water! Some spawning in water over 89o F for 2-3 months. Surviving in water over 90o F for several weeks. Can grow 1.19-1.25mm/week = 1cm in @ 2 months. Everett Laney, US Army Corp of Engineers, Tulsa
  16. 16.  Adopt TPWD “Recommendations for Action” as Initial SJRA Action Plan ◦ Direct control efforts toward Prevention  Public Awareness (partner w/ LCA and others)  Monitoring  Law Enforcement ◦ Evaluate potential control or containment measures Inform L.C. Event Sponsors of the dangers and precautions that must be taken prior to launching ◦ Aquapalooza ◦ TTBC
  17. 17.  Public Awareness Campaign ◦ Partner w/ TPWD in:  Community Outreach Efforts  Posters  Fliers  Other  Portland Sampling Efforts  Law Enforcement Efforts
  18. 18.  Research ◦ Potential Control or Containment Measures ◦ Investigate Potential Surface-Water Intake Structure & Spillway- Gate Modifications  Coatings?  Other ◦ N.T.M.W.D. Project (Alan Plummer & Associates)
  19. 19.  100th. Meridian Initiative ◦ http://www.100thmeridian.org/ Aquatic Nuisance Species Task Force ◦ http://www.anstaskforce.gov/default.php Western Regional Panel on Aquatic Nuisance Species (Have Developed A Detailed Action Plan) ◦ http://www.fws.gov/answest/aboutus.htm TEXASINVASIVES.ORG N.T.M.W.D. Contact – Mike Rickman 972-442-5405 Army Corp Expert - Everett Laney, Tulsa Office 918-669-7411 Alan Plummer & Associates Contact – Chuck Tracey, Ft. Worth office

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