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REPORT OF THE TECHNICAL CONSULTATION ON SMALL PELAGIC SPECIES OF THE STATISTICAL DIVISION WESTERN GULF OF GUINEA

Oceanographic Research Centre Abidjan, Côte d'Ivoire 8–12 December 1987

Year of publication 1989

Place of publication Rome, Italy ;

Author Mr François Xavier Bard, Mr Ph. Cury. Mr D.J. Faggianelli, Mr K. Koranteng.

Product type Project

Series title CECAF/ECAF Series

Series number 1014-9228

Edition 1

Synopsis (short abstract) For closer identification of major issues to be discussed during the meeting a brief account of main results achieved during previous working groups was made to the participants. 2.2 The CRODT study on the fishery-climate relationship was presented. Relationship between fishery statistics (catches, CPUE and effort) and climatic data were reviewed, using time as common indicator. This is dealt with at three different levels: a short-term approach based on multivariate time series analysis, to study the relationship between CPUE series and surface temperatures per intervals of two weeks. Empirical models used may prove of interest for short term CPUE surveys; a medium-term approach which analyses variations in annual CPUE values in relation to the intensity of the upwelling or of other environmental variables (Binet, 1983; Fréon, 1986; Cury and Roy, 1987). This type of global model, which introduces climate variables, should greatly increase knowledge on the impact of fishing and of environmental variations on the annual abundance level. Basically explicative in nature, this type of model is poorly predictive; a long-term approach which concentrates on describing the demographic strategies of the two sardinella species by comparing the biological/demographical parameters for better understanding of factors responsible for the instability of Sardinella aurita stocks (Cury and Fontana, 1988). This approach highlights the need for resource management based on the biologi cal strategy of the species involved.

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

Language English

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    The meeting reviewed the progress achieved since 1983 1.n the various fields of research recommended by the previous consultation and, in particular, in demersal and pelagic stocks assessment. It also considered the! problem of small scale fisheries assessment and proposed research directives for the intersessional period. A Workshop on simple analytic methods for stock assessment was held in conjunction with the Consultation. It was proposed to orgauize the next consultation in Fuengirola (Mala ga), Spain, in 1987.
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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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    The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organisation or the financing agency concerning the legal status of any country or territory, city or area, or of its authorities, or concerning the delimitations of its frontiers or boundaries.
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