Marine fouling of fishing vessels on the African fishery grounds was investigated with a skin diving method /SCUBA/ during five fishing cruises in the years 1969-1972 with a 73 days stay at Las Palmas included. The fouling was beeing found during the whole year with a particularly extensive growth in the summer months. Cirripedia Thorecica, algea and other attached animals were found to be the chief fouling organisms. It was noticed that the process of esttling during the veseel exploitation time partly differed from that during the long stay in a harbour period with a simultaneously similar vertlical distribution of organisms on a submerged part of ship. It was concluded that the Polish antifouling paint did not eliminate the settling. The paper is illustrated with tables and the author's own photographs.