COVER


REPORT OF THE SPECIAL WORKING GROUP
ON CEPHALOPOD STOCKS IN THE NORTHERN REGION OF CECAF


TABLE OF CONTENTS

PROGRAMME FOR THE DEVELOPMENT OF FISHERIES IN
THE EASTERN CENTRAL ATLANTIC INT/81/014
FISHERIES COMMITTEE FOR THE EASTERN CENTRAL ATLANTIC		CECAF/ECAF SERIES 82/24 (En)

Centro Costero de Canarias
Instituto Español de Oceanografía
27–30 January 1982

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FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
UNITED NATIONS DEVELOPMENT PROGRAMME Rome, 1982
© FAO,

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TABLE OF CONTENTS

1.INTRODUCTION
2.DESCRIPTION OF THE FISHERIES
 2.1Morocco
 2.2Spain
 2.3Korea
 2.4Japan
 2.5USSR
 2.6Senegal
 2.7Other Countries
3.AVAILABLE STATISTICAL DATA
 3.1Spain
 3.2Morocco
 3.3Korea
 3.4Other Countries
 3.5Size Composition of Catches
4.BIOLOGICAL PARAMETERS
 4.1Total Length - Mantle Length
 4.2Mantle Length/Weight Ratio
 4.3Live Weight - Gutted Weight
 4.4Fertility
 4.5Sex Ratio and Size
 4.6Selectivity
 4.7Stock Structure
 4.8Growth
 4.9Mortality
  4.9.1Total Mortality
  4.9.2Natural Mortality
5.STOCK EVALUATION
 5.1Application of the Production Model
  5.1.1Octopus
  5.1.2Cuttlefish
 5.2Yield per Recruit
  5.2.1Yield Tables
  5.2.2Analysis of Size Frequency Distribution
 5.3Preliminary Analysis of Recruitment
  5.3.1Biological Cycle
  5.3.2Inter-annual Evolution of Recruitment
 5.4Stock/Recruitment Ratio
 5.5Conclusions
6.ADOPTION OF THE REPORT
 REFERENCES
Appendix 1:LIST OF PARTICIPANTS
Appendix 2: ORDER DU JOUR
Appendix 3: COMPOSICION DE LAS CAPTURAS DE OCTOPUS VULGARIS REALIZADAS POR LA FLOTA ESPAÑOLA EN LA DIVISION 34.1.3 DE CECAF EN EL PERIODO DE 1976 A 1980
Appendix 4:COMPOSICION DE LAS CAPTURAS DE LOLIGO VULGARIS REALIZADAS POR LA FLOTA ESPAÑOLA EN LA DIVISION 34.1.3 DE CECAF EN EL PERIODO DE 1976 A 1980
Appendix 5: COMPOSICION DE LAS CAPTURAS DE SEPIA SPP. REALIZADAS POR LA FLOTA ESPAÑOLA EN LA DIVISION 34.1.3 DE CECAF EN EL PERIODO DE 1976 A 1980
Appendix 6:DISTRIBUTION DE LOS RENDIMIENTOS DE OCTOPUS VULGARIS OBTENIDOS EN LAS CAMPAÑAS DE COLABORACION CIENTIFICA HISPANO-MARROQUI EFECTUADAS EN LA DIVISION 34.1.3 DE CECAF POR EL B/O IBN SINA
Appendix 7:DISTRIBUTION DE LOS RENDIMIENTOS DE SEPIA OFFICINALIS OBTENIDOS EN LAS CAMPAÑAS DE COLABORACION CIENTIFICA HISPANO-MARROQUI EFECTUADAS EN LA DIVISION 34.1.3 DE CECAF POR EL B/O IBN SINA
Appendix 8: DISTRIBUTION DE LOS RENDIMIENTOS DE LOLIGO VULGARIS OBTENIDOS EN LAS CAMPAÑAS DE COLABORACION CIENTIFICA HISPANO-MARROQUI EFECTUADAS EN LA DIVISION 34.1.3 DE CECAF POR EL B/O IBN SINA
Appendix 9:ETUDE DE LA SELECTIVITE DU CHALUT DE FOND ESPAGNOL UTILISE DANS LA PECHERIE DE CEPHALOPODES DU SAHARA MAROCAIN
Appendix 10:ELEMENTS DE BIOLOGIE ET D'IDENTITE DES POPULATIONS DE SEICHES (SEPIA OFFICINALIS HIERREDDA) DES COTES SENE-GAMBIENNES
Appendix 11:QUELQUES CORRECTIONS AUX RESULTATS DU GROUPE DE TRAVAIL SPECIAL SUR LES STOCKS DE CEPHALOPODES APPORTEES PAR LE PROJET COPACE ET BASEES SUR DE NOUVELLES DONNEES NON DISPONIBLES AU GROUPE DE TRAVAIL

LIST OF TABLES

1.CUTTLEFISH, SQUID AND OCTOPUS TOTAL CATCHES AND PERCENTAGES BY ZONE-QUARTERLY STRATUM OF THE KOREAN FLEET IN 1980
2.CEPHALOPODS. DECLARED NOMINAL CATCHES (1 000 t), BREAKDOWN BY COUNTRY IN THE CECAF NORTHERN REGION
3.OCTOPUS. DECLARED NOMINAL CATCHES (1 000 t), BREAKDOWN BY COUNTRY IN THE CECAF NORTHERN REGION
4.CUTTLEFISH. DECLARED NOMINAL CATCHES (1 000 t), BREAKDOWN BY COUNTRY IN THE CECAF NORTHERN REGION
5.SQUID. DECLARED NOMINAL CATCHES (1 000 t), BREAKDOWN BY COUNTRY IN THE CECAF NORTHERN REGION
6.SPANISH CPUE DATA - DIVISION 34.1.3
7.CATCHES, EFFORT AND CPUE FOR SPAIN, MOROCCO AND KOREA (1980 AND 1981)
8.WEIGHT (kg, UNGUTTED) - MANTLE LENGTH (cm) RATIOS OBTAINED DURING DIFFERENT CRUISES BY IBN SINA
9.OCTOPUS VULGARIS SEX RATIOS IN IBN SINA EXPERIMENTAL TRAWLING CAMPAIGNS
10.SEPIA OFFICINALIS SEX RATIOS IN IBN SINA EXPERIMENTAL TRAWLING CAMPAIGNS
11.LOLIGO VULGARIS SEX RATIOS IN IBN SINA EXPERIMENTAL TRAWLING CAMPAIGNS
12.EVOLUTION OF PERCENTAGE OF JAPANESE CATCHES IN DIVISION 34.1.3
13.EVOLUTION OF JAPANESE AND KOREAN CATCHES AT CAPE BLANC
14.CATCH, EFFORT AND CPUE IN THE CAPE BLANC AND DAKHLA SECTORS OF DIVISION 34.1.3
15.EVOLUTION OF CUTTLEFISH CATCH, EFFORT AND CPUE IN THE 34.1.3 REGION FROM 1969 TO 1980

LIST OF FIGURES

1.Octopus vulgaris. Mantle length/weight ratios obtained during different cruises of research ship IBN SINA
2.Evolution of percentages of females according to mantle length
3.Catch curves for octopus in the Dakhla region
4.Ratio between fishing effort and Z estimated total mortality
5.Catch, efforts and cpue in the Dakhla region
6.Catch, efforts and cpue in the Cape Blanc region
7.Production model for Dakhla stock, best adjustment (M = 0.2)
8.Production model (Fox) for Dakhla octopus stock
9.Production models (Fox) for Cape Blanc octopus
10.Production model (Schaefer) for Cape Blanc octopus
11.Production model (Schaefer) for cuttlefish in Division 34.1.3
12.Production model (Fox) for cuttlefish in Division 34.1.3
13.Production model for cuttlefish in Division 34.1.3 (m = 0.1)
14.Per fish mortality vector movement according to age for octopus at Cape Blanc (1969–71) and Dakhla (1976–79)
15.Reconstruction of life cycle of Cape Blanc octopus
16.Evolution of recruitment index in Dakhla region
17.Evolution of spring recruitment index in the Cape Blanc region
18.Parent stock/recruitment ratio for Cape Blanc octopus