Catfish Bend Casino received permission from state regulators today to shut down its struggling Fort Madison gambling boat, putting about 180 people out of work in southeast Iowa. The action by the Iowa Racing and Gaming Commission doesn’t affect Catfish Bend’s new USD 50 million casino and hotel complex in Burlington, which will remain open seven days a week. “The boat just can’t compete at this point and it wasn’t generating enough revenue to survive,” said Gary Hoyer, chief executive of Great River Entertainment Inc., the parent of Catfish Bend.