TPWD Executive Order 12-003:
Zebra Mussels in the Elm Fork tributary of the Trinity River.
The Executive Director of the Texas Parks and Wildlife Department finds that zebra mussels ("Dreissena polymorpha") present an immediate danger to aquatic species regulated by the department and hereby ORDERS the adoption of emergency rules to contain zebra mussels in all impounded and tributary waters of the Elm Fork of the Trinity River upstream from the Lewisville dam. The Executive Director authorizes the immediate submission of Notice of Emergency Rulemaking in the "Texas Register".
Executive Order No. 12-003
Notice of Emergency Rulemaking
Zebra Mussels - Fact Sheet
Zebra Mussels - TexasInvasives.org
Zebra Mussels - Tri-Fold Brochure
Zebra Mussels - Wallet Card
Zebra Mussel Resource Document - Trinity River Basin, Texas