Aberdeen had been a major maritime centre throughout the 19th century, when a group of local entrepreneurs launched the first steam-powered trawler. The steam trawling industry expanded and by 1933 Aberdeen was Scotland's top fishing port, employing nearly 3,000 men with 300 vessels sailing from its harbour. By the time oil was coming on stream, much of the trawling fleet had relocated to Peterhead. Although Aberdeen still brings in substantial catches, the tugs, safety vessels and supply ships which pack the harbour far outnumber the trawlers.