Demersal fishery resources in the western gulf of Guinea and Sherbro Los recursos pesqueros demersales del sector occidental del golfo de Guinea y de Sherbro |
FISHERY COMMITTEE FOR THE EASTERN CENTRAL ATLANTIC COMITE DE PESCA PARA EL ATLANTICO CENTRO-ORIENTAL with the assistance of the: con la colaboración de la: SECRETARIA GENERAL DE PESCA MARITIMA and the/y del INSTITUTO ESPANÕL DE OCEANOGRAFIA (Spain/España) | CECAF/ECAF SERIES 91/55 SERIE CPACO/PACO 91/55 |
Report of the working group on the
demersal fishery resources in the western gulf of Guinea
and Sherbro statistical divisions
Informe del Grupo de trabajo sobre los
recursos pesqueros demersales en las divisiones
estadisticas del sector occidental del
golfo de Guinea y de Sherbro
held at the/reunido en el
CENTRE DE RECHERCHES OCEANOGRAPHIQUES
Abidjan, Côte d'Ivoire
24–28 September 1990/24–28 de septiembre de 1990
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS ORGANIZACION DE LAS NACIONES UNIDAS PARA LA AGRICULTURA Y LA ALIMENTACION Rome/Roma, 1992
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2. REVIEW OF PAST TRAWLING SURVEYS UNDERTAKEN IN THE AREA
3. THE EXECUTION AND MAIN RESULTS OF THE SURVEY OF THE CONTINENTAL SHELF AND SLOPE AREAS OFF CÔTE D'IVOIRE, GHANA, LIBERIA AND SIERRA LEONE (GUINEA-90 SURVEY)
5. STATISTICAL AND BIOLOGICAL DATA
5.2 Biological data collected during GUINEA-90 Survey
5.3 Length frequency data on some species of commercial importance
6.2 Estimation of biomass for the GUINEA-90 Survey
6.3 Comparison of biomass estimates of GUINEA-90 and other surveys
7. RECOMMENDATIONS FOR RESEARCH AND MANAGEMENT
It should be noted that the appendixes are presented in the original language as submitted by the authors.
Appendix 1 List of Participants
Appendix 3 Surveys carried out in the waters of Ghana
Appendix 4 Surveys carried out in the waters of Sierra Leone
Appendix 5 Surveys carried out in the waters of Côte d'lvoire
Appendix 6 Surveys carried out in the waters of Liberia
Appendix 7 Total marine fishery production of Sierra Leone for the period 1971–1982
Table 1. Characteristics and composition of the Ghanaian fishing fleets, 1980–1989
Table 2. Evolution of trawl fleet in Côte d'Ivoire from 1950 to 1989
Table 4. Catches of demersal finfishes from Ghanaian waters by the industrial sector, 1974–1989
Table 6. Catches of demersal finfishes in Ghanaian waters (all fleets) from 1977–1989
Table 8. Catches by species made by Ivorian trawlers/shrimpers on the continental shelf
Table 12. GUINEA-90 Survey: Length-weight relationship for Sparidae
Table 14. GUINEA-90 Survey: Total length-fork length relationships for various species
Table 17. Upwelling index and duration at Tema (1963–1989)
Table 18. Mean yields and variances obtained from the main CHALCI surveys
Table 19. GUINEA-90 Survey: Biomass by depth strata and sector
Table 20. GUINEA-90 Survey: Densities by depth strata and sector for total demersal species
Table 21. GUINEA-90 Survey: Catch specific composition in two net types
Table 22. Estimated biomass by strata and sector in GTS and GUINEA-90
Table 23. Estimated densities by strata and sector in GTS and GUINEA-90
Table 24. GUINEA-90 Survey: Estimated biomass of different species by depth and sector
Table 25. Catch rates (25.1) and densities (25.2) (1 and 2) of total demersal stocks and selected species obtained in trawling surveys on the continental shelf of Ghana, 1963–1990
Table 26. Catch of Balistes capriscus and number of specimens by depth and sector; GUINEA-90 Survey
Table 27. Lagocephalus laevigatus catches by strata and sector during GUINEA-90 Survey
Table 29. Biomass and density of Lagocephalus laevigatus off Côte d'Ivoire and Ghana
Table 30. Catches of crustaceans by depth and sector; GUINEA-90 Survey
Table 31. Percentage of biomass of main fish groups during various surveys in Côte d'Ivoire
Table 32. Biomass of main fish groups during various surveys in Côte d'Ivoire - warm seasons
Table 33. Biomass of main fish groups during various surveys in Côte d'Ivoire - cold seasons
Table 37. Upwelling indices by fortnight on the coast of Côte d'Ivoire, January-August 1990
1.1 1.2 1.3 1.4 2.1 2.2 2.3 3.1 3.2 3.3 4.1 4.2 Length-frequency histograms for Brachydeuterus auritus, Pagellus bellottii and Dentex angolensis. Samples collected during GUINEA-90 and at Abidjan in April 1989 and 1990
5. FRUT surveys trawling stations, 1969–70 and 1979–80
6. FRUT surveys sampling design, 1981 to 1990
7. GUINEA-90: Densities of total demersal species by sector
8. Trend of densities in trawling surveys off Ghana, 1963–1990
9. Distribution of Balistes capriscus: GUINEA-90
10. Lagocephalus laevigatus: Catches by strata and sector, GUINEA-90
11. Geographical distribution of Lagocephalus laevigatus; GUINEA-90
12. Lagocephalus laevigatus: average weight by depth strata and sectors; GUINEA-90
13.1 Minimum estimated densities of demersal fish in Côte d'Ivoire (1978–1990): CHALCI methodology
15. Fortnightly upwelling indices for Côte d'Ivoire, January-August 1990
18. Global production model applied to landings of Ivorian trawlers, 1959–1989
19. Production isopleths for seven species of economic importance landed by Ivorian trawlers