A trawlboat, also called a trawler, is a fishing vessel used to catch fish using a trawl net dragged along the ocean floor. There are various synonyms for trawlboat, such as dragboat, seineboat, and scallop dredger. A dragboat is used for fishing by dragging a heavy net behind it, while a seineboat uses a seine net to encircle a school of fish. On the other hand, a scallop dredger is used to harvest scallops by scraping them off the sea bed using a dredge. Other names for trawler include dragger, bottom trawler, and stern trawler, depending on the type of net and techniques used for fishing.