Data on trawl selectivity for mackerel icefish (Champsocephalus gunnari L.), were collected in 1981 in the South Georgia area. The trawl bags tested were made of net webbing with 3.1 mm twine and 88.2 mm mesh size. Trawling speed was 3.5 knots. Icefish comprised 90 to 100% of catches. The logistic selectivity curves were calculated using the collected data. It was found that the selectivity factor for 88.2 mm mesh size was 2.81 and the 50% retention length was 24.8 mm (21.5 to 28.2 mm).