Report of the Ad-Hoc Working Group on the Assessment of the Shrimp Stocks (Penaeus Duorarum Notialis) of the Ivory Coast - Congo

Table of Contents

CECAF/ECAF SERIES 78/6 (En)

PROJECT FOR THE DEVELOPMENT OF FISHERIES IN THE EASTERN CENTRAL ATLANTIC

FISHERY COMMITTEE FOR THE EASTERN CENTRAL ATLANTIC

REPORT OF THE AD HOC
WORKING GROUP ON THE ASSESSMENT OF SHRIMP STOCKS (Penaeus duorarum notialis)
OFF IVORY COAST - CONGO

“CENTRE DE RECHERCHES OCEANOGRAPHIQUES”
ABIDJAN (IVORY COAST)
6-11 February 1978

FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
UNITED NATIONS DEVELOPMENT PROGRAMME
ROME 1979

The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.

The copyright in this book is vested in the Food and Agriculture Organization of the United Nations. The book may not be reproduced, in whole or in part, by any method or process, without written permission from the copyright holder. Applications for such permission, with a statement of the purpose and extent of the reproduction desired, should be addressed to the Director, Publications Division, Food and Agriculture Organization of the United Nations, Via delle Terme di Caracalla, 00100 Rome, Italy.

© FAO 1979

This electronic document has been scanned using optical character recognition (OCR) software and careful manual recorrection. Even if the quality of digitalisation is high, the FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.

Table of Contents

1. INTRODUCTION

2. DISTRIBUTION OF STOCKS

3. BIOLOGY OF THE SPECIES

3.1 Ecology and distribution of adults
3.2 Behaviour and catch rates
3.3 Reproduction and larval migration
3.4 Migration of juveniles
3.5 Recruitment and sexual maturity
3.6 Growth
3.7 Mortality

4. DESCRIPTION OF FISHERIES

4.1 Fishing fleets
4.2 Available statistics
4.3 Catch rates
4.4 Sizes of shrimps caught

5. ASSESSMENT OF MARINE STOCKS

5.1 Ivory Coast
5.2 Ghana
5.3 Togo
5.4 Benin, Nigeria, Cameroon
5.6 Conclusions

6. INTERACTIONS BETWEEN ARTISANAL AND INDUSTRIAL FISHERIES

7. MANAGEMENT OF SHRIMPS STOCKS

7.1 Catch quotas or effort limitation
7.2 Changes in mesh size of shrimp trawl
7.3 Regulation of artisanal fishery to protect juvenile shrimps
7.4 Closed seasons at sea
7.5 Priorities in management

8. EFFECT OF THE PROPOSED MANAGEMENT MEASURES ON THE SHRIMP FISHERY IN THE IVORY COAST

9. PRIORITIES IN RESEARCH

9.1 Studies in lagoons and rivers
9.2 Studies at sea
9.3 Important remarks

10. POTENTIAL OF OTHER SPECIES

11. FINAL ARRANGEMENTS

REFERENCES

Appendix 1: LIST OF PARTICIPANTS

Appendix 2: AGENDA

Appendix 3: NUMBER OF SHRIMP BOATS OPERATING PER COUNTRY

Appendix 4: SUMMARY OF AVAILABLE INFORMATION ON GHANA

Appendix 5: SUMMARY OF AVAILABLE INFORMATION ON TOGO

Appendix 6: SUMMARY OF AVAILABLE INFORMATION ON BENIN

Appendix 7: SUMMARY OF AVAILABLE INFORMATION ON NIGERIA

Appendix 8: SUMMARY OF AVAILABLE INFORMATION ON CAMEROON

Appendix 9: SUMMARY OF AVAILABLE INFORMATION ON GABON

Appendix 10: DISTRIBUTION OF SEDIMENTS AND SHRIMPS IN WATERS OF IVORY COAST

Appendix 11: BOTTOM DEPOSITS OF THE CONTINENTAL SHELF OF GHANA

Appendix 12: BOTTOM DEPOSITS OF THE CONTINENTAL SHELF OF TOGO AND BENIN

Appendix 13: FISHING GROUNDS FOR PENAEUS DUORARUM IN NIGERIA

Appendix 14: BOTTOM TYPE OF THE CONTINENTAL SHELF OF CAMEROON

Appendix 15: BOTTOM TYPE OF THE CONTINENTAL SHELF OF GABON

Appendix 16: FISH CATCHES BY IVORIAN SHRIMPERS IN THE IVORY COAST