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HOUSTON -- Texas wildlife officials want to extend emergency rules designed to prevent a destructive mussel from continuing an invasive march through the state s waterways.

The Texas Parks and Wildlife Department said Monday the zebra mussel presents an immediate danger to wildlife.

The mussel is a small non-native shellfish that has wreaked havoc in the Great Lakes and several rivers, including the Mississippi and Hudson.

Studies find power companies in the Great Lakes region can spend $130 million annually to remove the mussels from electric plants. Texas officials fear the shellfish will clog water treatment intake pipes.

The TPWD says the mussels were found in mid-July in two waterways. The new rules require boat owners to take special measures and limit the type of bait to be used in some waterways.

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