The one constant about the management of offshore vessel operating companies is the domination of family members of the founder. Except for the largest of these companies, Tidewater, Inc., that is a public NYSE-listed firm, most of the companies in this category, large and small, are run by the descendents of the founder. Many of these companies still bear the founder's name and most of the vessels are named after family members. In 1948, Abdon Callais converted a shrimp trawler into an offshore service vessel and that began a company that is in its third generation of providing transportation of fluids and cargo to offshore oil and gas rigs. Abdon's sons Harold and Ronald became involved with offshore oil buisness.