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plural corklines
(fishing) The top line of a gillnet, which has attached floats (often, but not always, made of cork) that give that edge of the net buoyancy. quotations examples
Double corklines, one right-hand lay and one left-hand lay to prevent twisting, were used on all gill nets.
1957, Special Scientific Report: Fisheries - Issue 205, page 5
The porpoise safety panel shall consist of small mesh webbing not to exceed ¼" stretch mesh extending downward from the corkline and the base of the porpoise apron to a minimum depth equivalent to two strips of 100 meshes of 4¼" stretch mesh webbing.
1983, The Code of Federal Regulations of the United States of America
The hold was empty, without a net, corkline, leadline or buoy to be found.
1993, Dana Stabenow, A Fatal Thaw, page 103