Surveys of the fish resources of Namibia. Preliminary report cruise no. I/92. Pt. 1: Surveys of the hake stocks, 23 April - 22 May 1992. - Pt. 2: Surveys of the pelagic stocks, 24 May - 21 June 1992. Cruise Reports "Dr. Fridtjof Nansen"

biomasa biomass biomasse chalutage distribution naturelle echosounding especies fishery resources hidrografia hydrographie hydrography natural distribution pesca a la rastra recursos pesqueros rendement rendimiento ressource halieutique species trawling yields