Catug : Short for Catamaran Tug. A rigid catamaran tug connected to a barge. When joined together, they form and look like a single hull of a ship; oceangoing integrated tug-barge vessels
EESiFlo North America, Terminology and Glossary: Maritime Terms, Pennsylvania, USA 2002, flowmeterdirectory.com/flowmeter_terminology. (Mrtm/ Ports and Ships - Amer) {539}