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Survey of the Offshore Sub-surface Community from Togo to Cameroon and of the Shelf from Equatorial Guinea to the Congo (August - September 1981)

Year of publication 1981

Place of publication Rome, Italy ;

Author T. Strømme, L. Foyn, G.S. Saetersdal

Publisher Institute of Marine Research, Bergen ;

Product type Project

Edition 1

Synopsis (short abstract) The survey was planned as a 30-days-survey covering the shelf from Togo to Congo with the shelf off Nigeria and Cameroon covered only between 50-200 m depth limit. Due to a breakdown of a generator the survey had to be shortened by over a week, making the sampling intensity less than planned. Generally speaking the findings reveal an area with a very scattered fish distribution, both on small pelagic and demersal species. Dense plankton recordings occurred on most part of the shelf, making an accurate determination of the scant fish resources difficult. The estimates given reflect thus more an order of magnitude than absolute estimates. Both the northern and southern region were estimated to hold an average fish density of 39 tonnes/nm2 .In absolute figures the Togo - Cameroon 50-200 m depth region is estimated to hold 310,000 tonnes of fish while the Equatorial Guinea - Congo shelf region comprise 580,000 tonnes. Of this about 40% is allocated to demersal fish in the northern part a nd 25% in the southern. Only the sardinellas (Sardinella aurita and S. maderensis) off Gabon and Congo seem to form any stocks in terms of resources. The pelagic resources off Gabon and Congo were estimated to 350,000 tonnes of fish in the surveyed area, and about 50% of the biomass should belong to the sardinellas if one should split according to the catches. But this is a weakly based assumption as the hauls were few, the presence of the sardinellas were very concentrated and the trawl-avoidan ce is likely to be species dependent. Furthermore the sardinellas off Gabon - Congo belongs to stocks extending into Angola (TRODEC and GARCIA 1979) and the local abundance is thus heavily influenced by fluctuations according to the migratory pattern.

Language English

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