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Eastern Central Atlantic Fisheries - Report of the Ad Hoc Working Group on Sardinella off the Coast of Ivory Coast - Ghana - Togo

FISHERY COMMITTEE FOR THE EASTERN CENTRAL ATLANTIC

Year of publication 1980

Place of publication Rome, Italy ;

Product type Project

Series title CECAF/ECAF Series

Series number 1014-9228

Edition 1

Synopsis (short abstract) The first Ad hoc working group on the sardinella stocks in CECAF Statistical Division 34.3.4 was held at the Centre de recherches ocanographiques, Abidjan, Ivory Coast, from 28 June to 3 July 1976 through the joint efforts of the Fishery Research Unit of Ghana and the Centre de recherches ocanographiques of Ivory Coast. The apparent collapse of the sardinella stocks and the simultaneous explosion of the triggerfish (Balistes capriscus) were discussed by the working group. Assessment of the colla pse of the round sardinella (Sardinella aurita) was difficult due to lack of accurate information on many of the key parameters. In view of the current increase in the landings of S. aurita, a second meeting was planned to re-examine these problems. Scientists were invited from Senegal, Ivory Coast, Ghana and Togo to participate in the working group which was originally scheduled to take place at the Fishery Research Unit, Tema, Ghana, from 2 to 7 July 1979. It was, unfortunately, not possible t o hold the meeting with all the invited scientists.

Statutory body / Meeting title Fishery Committee for the Eastern Central Atlantic (CECAF)

Language English

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    Rapport du Groupe de Travail Ad Hoc sur les Sardinelles des Côtes de Côte-d’Ivoire-Ghana-Togo
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    Grâce aux efforts conjoints du "Fishery Research Unit" de Ghana et du Centre de recherches océanographiques de Côte-d'Ivoire, le Groupe ad hoc de travail sur les stocks de sardinelles présents dans la Division statistique 34.3.4 du COPACE a pu tenir sa première réunion, du 28 juin au 3 juillet 1976, à Abidjan, Côte-d'Ivoire. Les discussions du Groupe de travail ont porté sur la réduction considérable des stocks de sardinelles et l'augmentation simultanée des stocks de balistes (Balistes capriscu s). Le manque de données recueillies, pendant la période d'observation, sur les principaux paramètres n'a pas permis une estimation précise de la réduction des stocks de Sardinella aurita. Cette seconde réunion du Groupe ad hoc a été organisée pour examiner à nouveau le problème, compte tenu de l'augmentation des mises à terre de S. aurita enregistrée actuellement. Des chercheurs du Sénégal, de la Côte-d'Ivoire, du Ghana et du Togo ont été invités à participer à cette réunion, initialement prévu e au Fishery Research Unit à Tema, Ghana du 2 au 7 juillet 1979. Malheureusement la réunion n'a pu se dérouler avec la participation de tous les chercheurs invités.
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    Report of the ad hoc working group on the coastal pelagic stocks of the western Gulf of Guinea
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    The objective of the working group was to update the statistics on the stocks of small pelagic fishes in the western Gulf of Guinea (Côte d'Ivoire, Ghana, Togo, Benin), refine the data, acquire a better understanding of the biology of the species and identify methods for a better evaluation of the stocks. The four species of concern to the Working Group were: Sardinella aurita, S.maderensis, Scomber japonicus and Engraulis encrasicolus. The sensitivity of coastal pelagic species to environ mental factors was emphasized and upwellings, discharge of coastal rivers into the sea, coastal currents, winds were related to the fisheries. The fisheries were described and in addition to the analysis of catch and CPUE data, a time-space analysis of catch statistics, yield and length frequencies were carried out, particularly for S. aurita and S.maderensis. The Working Group reviewed the biological data available and the hypotheses already put forward on the nature of the stocks of the differ ent species. Stocks assessments were based on CPUE and length frequencies data. The Working Group concluded that the recent modification of the productivity of the ecosystem was favourable to the fisheries and high catch rates and CPUE of Sardinella aurita show that the related stock (or stocks) are recovering. The Working Group recommended to pursue the study of relevant physical and oceanographical factors, to strengthen statistics, biology and data processing. Multivariate analysis were al so recommended to establish for the principal species, the typology of strata defined by fishing zone-month-gear within which reliable abundance index should be calculated.
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    Identification and analysis of marine fisheries research - Case studies from selected countries in the Fishery Committee for the Eastern Central Atlantic (CECAF) area of competence 2022
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    During 2020, the ASFA Secretariat supported the CECAF-PESCAO project by compiling an inventory of marine fisheries research produced in nine countries (Benin, Côte d’Ivoire, Ghana, Guinea, Mauritania, Morocco, Nigeria, Senegal, Spain). A search methodology was agreed with the CECAF project team, with support from the EAF-Nansen Programme to identify relevant marine fisheries research. Further parameters, including publication date and author affiliation, were defined in order to conduct systematic and repeatable searches. In the first stage, online searches were conducted using four sources (ASFA, Google Scholar, Web of Science and Scopus). The second stage involved searching local and nationally held collections (library catalogues, institutional websites or repositories) to identify further references. The results from these searches were then combined to produce an inventory of 2 411 unique references. A bibliometric analysis was then conducted on the inventory which revealed intensive publishing activity and strong collaboration across the region, however publishing in predatory journals and difficulty in locating grey literature on online sources were areas where further work is needed to ensure research produced in the area reaches a wide audience. A detailed analysis of research published by authors affiliated to Senegalese institutions was conducted which revealed a significant gender imbalance of authors (only 13 percent of authors identified in the study were female). Recommendations included in this report are to expand the inventory and analysis to other CECAF member countries and to take steps to ensure the grey literature produced by authors from the CECAF region is indexed by online sources.
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    Also available in:
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  • No Thumbnail Available
    Project
    Report of the ad hoc working group on the coastal pelagic stocks of the western Gulf of Guinea
    Held at the Centre de Recherches Océanographique, Abidjan, Côte d'Ivoire 10–16 December, 1990
    1992
    Also available in:
    No results found.
    The objective of the working group was to update the statistics on the stocks of small pelagic fishes in the western Gulf of Guinea (Côte d'Ivoire, Ghana, Togo, Benin), refine the data, acquire a better understanding of the biology of the species and identify methods for a better evaluation of the stocks. The four species of concern to the Working Group were: Sardinella aurita, S.maderensis, Scomber japonicus and Engraulis encrasicolus. The sensitivity of coastal pelagic species to environ mental factors was emphasized and upwellings, discharge of coastal rivers into the sea, coastal currents, winds were related to the fisheries. The fisheries were described and in addition to the analysis of catch and CPUE data, a time-space analysis of catch statistics, yield and length frequencies were carried out, particularly for S. aurita and S.maderensis. The Working Group reviewed the biological data available and the hypotheses already put forward on the nature of the stocks of the differ ent species. Stocks assessments were based on CPUE and length frequencies data. The Working Group concluded that the recent modification of the productivity of the ecosystem was favourable to the fisheries and high catch rates and CPUE of Sardinella aurita show that the related stock (or stocks) are recovering. The Working Group recommended to pursue the study of relevant physical and oceanographical factors, to strengthen statistics, biology and data processing. Multivariate analysis were al so recommended to establish for the principal species, the typology of strata defined by fishing zone-month-gear within which reliable abundance index should be calculated.
  • Thumbnail Image
    Book (stand-alone)
    Identification and analysis of marine fisheries research - Case studies from selected countries in the Fishery Committee for the Eastern Central Atlantic (CECAF) area of competence 2022
    Also available in:
    No results found.
    During 2020, the ASFA Secretariat supported the CECAF-PESCAO project by compiling an inventory of marine fisheries research produced in nine countries (Benin, Côte d’Ivoire, Ghana, Guinea, Mauritania, Morocco, Nigeria, Senegal, Spain). A search methodology was agreed with the CECAF project team, with support from the EAF-Nansen Programme to identify relevant marine fisheries research. Further parameters, including publication date and author affiliation, were defined in order to conduct systematic and repeatable searches. In the first stage, online searches were conducted using four sources (ASFA, Google Scholar, Web of Science and Scopus). The second stage involved searching local and nationally held collections (library catalogues, institutional websites or repositories) to identify further references. The results from these searches were then combined to produce an inventory of 2 411 unique references. A bibliometric analysis was then conducted on the inventory which revealed intensive publishing activity and strong collaboration across the region, however publishing in predatory journals and difficulty in locating grey literature on online sources were areas where further work is needed to ensure research produced in the area reaches a wide audience. A detailed analysis of research published by authors affiliated to Senegalese institutions was conducted which revealed a significant gender imbalance of authors (only 13 percent of authors identified in the study were female). Recommendations included in this report are to expand the inventory and analysis to other CECAF member countries and to take steps to ensure the grey literature produced by authors from the CECAF region is indexed by online sources.
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