Report of the Ad Hoc Working Group on the Assessment of Cephalopod Stocks













Table of Contents


Project for the Development of Fisheries in the Eastern Central Atlantic
Fishery Committee for the Eastern Central Atlantic
CECAF/ECAF SERIES 78/11 (E)

Laboratorio Oceanográfico
Santa Cruz de Tenerife, Spain
18-23 September 1978

FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS UNITED NATIONS
UNITED NATIONS DEVELOPMENT PROGRAMME
Rome, April 1979

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© FAO 1979

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Table of Contents


1. OPENING OF THE MEETING

2. DESCRIPTION OF THE FISHERY

2.1 The resources
2.2 The fleets

3. POPULATION AND BIOLOGICAL PARAMETERS

3.1 Growth of octopus
3.2 Mortalities

(a) Natural mortality
(b) Fishing and total mortalities

3.3 Selectivity and mesh size assessments (octopus and cuttlefishes)
3.4 Length measurement for stock assessment purposes

4. PRODUCTION MODELS

4.1 Catches
4.2 Present level and recent trends of nominal effort
4.3 Catch per unit effort
4.4 Potential yields and present levels of exploitation

5. MANAGEMENT

6. FUTURE RESEARCH ACTIVITIES

6.1 Fishery statistics and biological data
6.2 Biology and stock assessment

7. ADOPTION OF THE REPORT

APPENDIX 1 List of participants

APPENDIX 2 Agenda

APPENDIX 3 Japanese Research Report

APPENDIX 4 Geographical distribution of two subspecies of Sepia officinalis LINNE off the northwestern coast of Africa

APPENDIX 5 Spawning season of the cuttlefish, Sepia officinalis officinalis LINNE, off the northwestern coast of Africa

APENDICE 6 Selectividad de Octopus vulgaris del Atlántico Centro-oriental (26°10'N-23°30'N)

APENDICE 7 Distribución y abundancia de Octopus vulgaris en el Atlántico Centro-oriental (26°10'N-23°30'N)

APENDICE 8 Estructura de la población de Octopus vulgaris del Atlántico Centro-oriental (26°10'N-23°30'N)

APENDICE 9 Edad y crecimiento de Octopus vulgaris del Atlántico Centro-oriental (26°10'N-23°30'N)

APÉNDICE 10 Sobre Sepia officinalis del Atlántico Centro-oriental (26°10'N-23°30'N)

APPENDIX 11 Spawning season of common octopus, Octopus vulgaris CUVIER, off the northwestern coast of Africa

APPENDIX 12 Preliminary assessment of the long-term effects of a change in mesh size in the octopus fishery