The fourth coverage started from Luanda on 5 November. The survey net was laid out mainly in correspondence with the previous survey. In accordance with the main objectives an acoustic coverage of the whole shelf from Cunene River to Cabinda, and a concurrent trawl survey in the region Luanda - Cabinda was carried out. In addition, as far as time permitted, the 200 to 600 meter slope in the region Lobito - Cabinda was investigated with bottom trawling.
Figure 1-3 show the cruise track and station work.
The vessel first steamed south to Baia dos Tigres where one day was spent in calibrating the acoustic equipment. The Baia dos Tigres area was surveyed in 5 days, the Porto Alexandre - Benguela region in 3 days, Benguela - Luanda in 7 days and Luanda - Cabinda in 10 days, including the trawling on the slope. The weather conditions were good during the survey. The vessel called on Luanda 26-27 Nov. to exchange Angolan participants. The survey was closed with a call on Cabinda on 5 Dec.
Fishing stations included 90 bottom trawl stations and 42 pelagic trawl stations. Of these 29 were bottom trawl hauls on the continental slope. The total distance surveyed in Angolan waters was 5000 nm.
