Dictionary of Ichthyology  

keerdrag = a small trawl with an oblong mouth, the bottom and sides of which are composed of an iron rod for weight and the upper edge of wood for buoyancy. The net tapers posteriorly for 7-8 feet to a round opening. Mesh size decreases posteriorly. The tow rope is attached by a bridle with three connections, one to the middle of the wooden beam and two to the middle of each side. The net is operated over the stern of a row-boat.

From Yarrell's "A History of British Fishes", 1836. Photograph by Brian W. Coad.        

Canadian Museum of Nature