Invasive Species


Preventing the Spread of Invasive Zebra Mussels:
Frequently Asked Questions for Marina/Boat Repair & Maintenance Operators
TPWD has put together an extensive FAQ document for marina owner/operators regarding zebra mussels
Download FAQs here

Prevention for Marinas: Standard Practices and Procedures for Incoming/Outgoing Marina Slip Leaseholders
This document details best practices for incoming/outgoing boats to prevent the spread of zebra mussels
Download Standard Practices here

Online Resources

To learn more about zebra mussels, check out these resources online:

     o “Stop Zebra Mussels” (3.5 minutes) -
     o “Attack of the Zebra Mussels” (1.5 minutes) -

Resources for Inspection & Decontamination:
o  “Inspection & Decontamination 2011” (28 minutes) -
    o  Inspection and decontamination training:

State Laws Concerning Zebra Mussels

*  It is illegal to possess or transport zebra mussels, knowingly or unknowingly, regardless of whether they are alive or dead, adult or juvenile—including microscopic larvae. Zebra mussels are designated as ‘Harmful or Potentially Harmful Shellfish’ under Title 31 Chapter 57A of the Texas Administrative Code.

Persons leaving or approaching public fresh water are required to drain all water from their vessels and any on-board receptacles under Title 31 Chapter 57N of the Texas Administrative Code. This rule applies at all sites where boats can be launched and includes all types and sizes of boats whether powered or not, personal watercraft, sailboats, kayaks/canoes, or any other vessel used to travel on public waters.

TPWD has information on both laws (including the exceptions to the water draining rules) in an easy-to-understand format:


For questions about zebra mussel ecology, how they spread, impacts, boat decontamination, regulations, or what to do if you encounter a boat:
Brian Van Zee
Region 2 Director
TPWD Inland Fisheries Management Branch
Phone: (254) 867-7974 or cell 254-495-8341

Monica McGarrity
Aquatic Invasive Species Biologist
TPWD Inland Fisheries Habitat Cons. Branch
Phone: 512-389-8292 or cell (813) 766-4559 (call or text)

Local TPWD Inland Fisheries Management biologists for your district:

To order more informational materials to provide to your clients:
Outreach materials can be ordered online for delivery by mail—visit:

For questions about the zebra mussel public awareness campaign, including outreach materials:
Carly Montez
Senior Marketing Specialist
TPWD Communications Marketing Group
Phone: (512) 389-4794