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ST. AUGUSTINE, Fla. (AP) - The rare Asian black tiger shrimp is showing up in big numbers in the waters off St. Augustine.

The St. Augustine Record reportstwo boats recently pulled into the docks with 25 pounds each of tiger shrimp.

Matt Sweeney of the Seafood Shoppe fish house says tiger shrimp numbers have been rising for a couple of months. Pam Fuller with the United States Geological Survey told the newspaper she had never heard of such a large concentration of the shrimp.

Tiger shrimp sightings have been considered an oddity over the last 25 years.

The shrimp are considered an invasive species and some scientists worry about what their resurgence could mean in the long run.