Lewis Morris' early chart for Aberystwyth includes a large annotation 'The Herring Fishery' - likely to reflect a large diffuse area of drift net fishing activity noted from time of Elizabeth I using small open decked boats.

Sources include:
Morris, L, 1748, Plans of Harbours, Bars, Bays and Roads in St George's Channel, plate 17

Maritime Officer, RCAHMW, April 2014