Trawling of commercial prawn species was undertaken in the Western Gulf of Carpentaria, in the Groote Eylandt region. Areas subject to commercial fishing were targeted, with sampling being undertaken at approximately monthly intervals between October 1982 and March 1983. The sampling platform was the 15.8m prawn trawler F.V. "Paulwin", towing standard double-twin rig otter trawls. All prawns sampled were identified, sexed, and measured. The total weight for each species, by sex, was measured to ± 5g. Project objectives were: To determine the size composition of the principal tiger prawn species (Penaeus esculentus and Penaeus semisulcatus) and endeavour prawn species (Metapenaeus endeavouri and Metapenaeus ensis) on the commercial fishing grounds subject to seasonal closure in the western Gulf of Carpentaria; to undertake these determinations at monthly intervals between October 1982 and March 1983 inclusive, using a chartered prawn trawler; and to assess and report on the size composition of prawns on fishing grounds within or adjacent to the closed area with reference to the effectiveness of the closures in space and time. Refer to the listed report for further information.