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MARBLE FALLS — While zebra mussels may not be larger than a fingernail, officials are concerned a possible invasion of the Highland Lakes by the tiny mollusks could pack a hefty environmental punch.

"They’ll present a major problem if they make it into the Highland Lakes," said David Cowan, a Lower Colorado River Authority aquatic scientist.

Though zebra mussels aren’t large, they can become a problem in lakes and rivers because they multiply so fast. Lower Colorado River Authority and Texas Parks and Wildlife Department officials are asking boaters to take precautions — such as washing water craft — to prevent the spread of them. Photos courtesy 
of the Texas Parks and Wildlife Department