Published: Jul 31, 2013 1:31 PM EDT

CAPE CORAL, Fla.- Juergen H. Kreuzer, 52, was ordered yesterday to pay a fine of $4,000 for operating a vessel at 55 miles per hour in a posted and marked 25 mile per hour manatee protection zone.

Kreuzer was operating his boat on the Caloosahatchee River, near Shell Point. He pleaded guilty on July 16.

According to court documents, Kreuzer had seven prior convictions for manatee zone speeding violations. Kreuzer operates All Around Boats, a business in Cape Coral that is engaged in boat rentals, and fishing and boat tours.