It could be found on major warships, armed trawlers and defensively equipped merchant ships. The sweeps are dragged by minesweepers, either purpose-built military ships or converted trawlers. Bottom trawlers and sink gillnets are the primary equipment used to harvest spiny dogfish. The effort also included tugs, trawlers, and tankers. Today Fowey is busy with trawlers and yachts. There is a small fleet of oceangoing trawlers that operate out of Tallinn. Mechanised hauling devices are used on modern trawlers. The convoy next encountered two French fishing trawlers. The overfishing generally comes from foreign trawlers operating in the region. They are usually fished from beam trawlers, otter trawlers or seiners. The majority of trawlers operating on the high seas are freezer trawlers. Several of these old sailing trawlers have been preserved. A large number of fishing trawlers are also located at the port. Occupational safety is a concern on fishing trawlers. Romania acquired three German KFK naval trawlers in 1943.