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Nephrops and Pandalus STOCKS

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Nephrops and Pandalus STOCKS r • .., INTERNATIONAL COUNCIL FOR THE EXPLORATION OF THE SEA CONSEIL INTERNATIONAL POUR L' EXPLORATION DE LA MER ::"....... C.M. 1992/Assess :8 PARTl ..... '. "'. .":. "'WORKING GROUP ON Nephrops AND Pandalus STOCKS ABERDEEN, 26 FEBRUARY - 5 MARCH 1992 This document is areport of a Working Group of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council. Therefore, it should not be quoted without consultation with: the General Secretary ICES Paloogade 2-4 DK-1261 Copenhagen K Denmark CONTENTS PART 1 1 TERMS OF REFERENCE AND INTRODUCTORY NOTES. ....................... .. 1 2 PARTICIPANTS. .................................................. .. 1 3 THE PANDALUS STOCKS WITHIN ICES SUB AREA IV AND DIVISION JI[ ...••••••.•• •• 2 3.1 Pandalus Stocks in Sub-area IV and Division J1[a 2 3.2 Natural Mortality .............................................. .. 2 3.3 Skagerrak and the Norwegian Deeps 2 3.3.1 Landings................................................ 2 3.3.2 Discards 2 3.3.3 Effort.................................................. 2 3.3.4 Assessment............................................... 2 3.3.4.1 Age distributions ...............................•..... , 2 3.3.4.2 ~fean weight at age , 2 3.3.4.3 Natural mortality .............. •. 3 3.3.4.4 VPA ............................................ .. 3 3.3.4.5 Recruitment 3 3.3.4.6 Catch prediction ..................................... .. 3 3.4 Fladen Ground ................................................ .. 3 3.4.1 The Fishery 3 3.4.2 Effort data 3 3.4.3 Assessment............................................... 3 3.4.3.1 Age distribution of the catch ............................. .. 3 3.4.3.2 Mean weights at age .................................. .. 4 3.4.3.3 Natural mortality " 4 3.4.3.4 VPA ............................................ .. 4 3.4.4 Management considerations ................................... .. 4 3.5 Farn Deeps ................................................•. .. 4 4 UTILIZING ANNUAL LENGTH COMPOSITIONS IN THE ASSESSMENTS OF NEPHROPS ....4 4.1 Length Cohort Analysis . 4 4.2 Summary of alternative approaches examined by the "Methods" Working Group . 4 4.3 Description of method employed during the Working Group . 5 4.3.1 Introduction . 5 4.3.2 The Slicing program . 5 4.3.3 Virtual Population Analysis and tuning . 5 4.3.4 Predictions . 6 • 4.4 Icelandic approach . 7 4.4.1 Introduction . 7 4.4.2 Annual growth data ........................................•. 8 4.4.3 Age based assessment . 8 4.4.4 Catch predictions and discussion .................................. 8 4.4.5 Comparison of Icelandic approach with Working Group approach using the SE Ice- land stock as an example ..........................•...•....... 9 4.5 Future approaches and developments ...............................•.... 9 5 NEPHROPS STOCK ASSESSMENTS AND CATCH POSSIBILITIES ..............•...•• 9 5.1 General introductory notes 9 5.1.1 Functional Units and Management Areas ........................... .. 9 5.1.2 Fishery data and the problem of unreported landings 9 5.1.3 Assessments and inputs 10 5.1.4 Management considerations; provision of catch options. ................. .. 10 5.1.5 Section layout ........................................... .. 11 • 5.2 Management Area Va (Area A) ...........................•........... 11 5.2.1 Ieeland .............•................................... 11 5.2.2 Summary of Management Area Va (Area A) 12 5.3 Management Area Vb (non EC) (Area B) .................•..•............ 12 5.3.1 Faroes (Functional Unit 2) 12 5.3.2 Summary of Management Area Vb (non EC) (Area B) ....•............. .. 12 5.4 Management Area VIa (Area C) .•.....•........•.........•..••.•.... .. 12 5.4.1 North Minch (Functiona1 Unit 11) ..........................•.... .. 12 5.4.2 South Minch (Functional Unit 12) ............................... .• 13 5.4.3 Firth of Clyde (Functional Unit 13) ..........................••.. .. 14 5.4.4 Summary for Management Area VIa (Area C) .............•......•.... 15 5.5 Management Area Vb (EC) and VIb (Area D) 16 5.5.1 Summary for Management Area Vb (EC) and VIb ..................... .. 16 5.6 Management Area IlIa (Area E) .................... .. 16 5.6.1 Skagerrak (Functiona1 Unit 3) ............................•...... 16 5.6.2 Kattegat (Functional Unit 4) ....................•............... 16 5.6.3 Summary for Management Area IlIa (Area E) ..............•.......... 17 5.7 Management Area IVa 44-48 E6-E7 + 44E8 (Area F) .....................•..• 18 5.7.1 MorayFirth(FunctionaIUnit9) 18 5.7.2 Noup (Functional unit 10) 19 5.7.3 Summary for Management Area IVa 44-48 E6-E7 + 44E8 (Area F) 19 5.8 Management Area IVa Remainder (Area G) 19 5.8.1 Fladen Ground (Functiona1 Unit 7) ........................••.....• 19 5.8.2 Summary for Management Area VIa remainder (Area G) 20 5.9 Management Area IVb,c East of 10 East (Area H) .......................... .. 20 5.9.1 Botney Gut - Silver Pit •..............•..•.................•.. 20 5.9.2 Summary for Management Area IVb,c East of 10 East (Area H) ............ .. 23 5.10 Management Area IVb,c West of 10 East (Area I) ..............•.........•. .. 23 5.10.1 Farn Deeps (Functional Unit 6) •..•.....•.............•.......... 23 5.10.2 Firth of Forth (Functiona1 Unit 8) ................................. 25 5.10.3 Summary for Management Area IVb,c West of 10 East (Area I) .....•...•.. .. 26 5.11 Management Area VIIa (excluding 33E2-33E5) (Area J) 26 5.11.1 Irish Sea East (Functiona1 Unit 14) .......................••....... 26 5.11.2 Irish Sea West (Functional Unit 15) .............................. .. 27 5.11.3 Summary of Management Area VIIa (excluding 33E2-E5) (Area J) ..••......•. 29 5.12 Management Area VIId,e (Area K) .............................••...... 29 5.12.1 Summary of Management Area VIId,e (Area K) ..............•..•...... 30 5.13 Management Area VIIb,c,j,k (Area L) 30 5.13.1 Porcupine Bank ...............•...........................• 30 5.13.2 Aran Grounds (Galway Bay) (Functional Unit 17) 31 5.13.3 Republic ofIreland Coast (NW, Wand SW) (Functiona1 Units 18 and 19) .•...•.. 32 5.13.4 Summary of Management Area VIIb,c,j,k (Area L) .................... .. 32 • 5.14 Management Area VIIf,g,h and VIIa: rectangles 33E2-E5 (Area M) ..........••..... 32 5.14.1 Celtic Sea (Functional units 20+21 +22) 32 5.14.2 Summary for Management Area VIIf,g,h and VIIa 33E2·E5 (Area M) 34 5.15 Management Area VIlIa,b (Area N) 34 5.15.1 Bay of Biscay (Functional Units 23 +24) ........................... .. 34 5.15.2 Summary of Management Area VIlIa,b (Area N) 36 5.16 Management Area VIlIc (Area 0) .................................... .. 36 5.16.1 North Galicia (Functional Unit 25) 36 5.16.2 Cantabrian Sea (Functional Unit 31) .................•............. 37 5.16.3 Summary of Management Area VIlIc (Area 0) ....................... .. 37 5.17 Management Area VIlId,e (Area P) 37 5.17.1 Summary of Management Area VIlId,e (Area P) ...................... .. 38 5.18 Management Area IXa (Area Q) ••...•....••....•............••......•. 38 5.18.1 West Galicia (Functional Unit 26) ..••..........................•.. 38 5.18.2 North Portugal (North of Cape Espiche1) - Functional Unit 27 38 5.18.3 South West and South Portugal (Functional Units 28 and 29) ............•... 40 5.18.4 Gulf of Cadiz (Functional Unit 30) .................• 42 5.18.5 Summary for Management Area IXa (Area Q) .....•.....•........•..•• 42 5.19 Management Area IXb and X (Area R) ................................. .. 42 5.19.1 Summary of Management Area IXb and X (Area R) 42 6 TRAWL EFFICIENCY AND FISHING POWER IN NEPHROPS FISHERIES ............. .. 43 6.1 Introduction. .................................................. 43 6.2 Northem Ireland fleet 43 6.3 Swedish fleet .....•............................................. 43 6.4 Fleet and fishing gear developments in Scotland 43 6.4.1 Fleet survey 43 6.4.2 LPUE in relation to vessel and gear characteristics 44 6.4.3 Comparison between single- and multi-rig Nephrops trawls 44 6.5 Conclusions. .................................................. 44 7 TRANSFER OF WORK TO AREA BASED WORKING GROUPS 44 8 NEXT VENUE 45 9 REFERENCES. ..................................................... 45 TABLES 47 PART 2 FIGURES. ........................................................... .. 191 • 1 TERl\ISOFREFERENCEANDINTRODUC- In recent Nephrops Working Group reports an Annex has TORY NOTES been included containing summary information on Nephrops in each Functional Unit. This was drav.TI up at The Working Group on Nephrops Stocks met in the commencement of the systematic assessment of Aberdeen, Seotland from 26 February to 5 March 1992 Nephrops using the length basoo LCA approach. Since to: there has recently been a move towards the use of more 'age based' methods some of the information in the a) Review and improve technieal aspects of the Annex cannot be readily updated while at the same time existing assessments and evaluate the possibil­ additional information is now available. It was decided ities of utilising annual length composition on this oceasion to omit the Annex. An updated rede­ information in the assessments; signed Annex will be included periodically in the future onee the assessment methodology has become more b) Update the information where necessary (ie firmly established. where input parameters have signifieantly ehanged) for Nephrops stocks in the ICES area on the state of exploitation and catch possibil­ 2 PARTICIPANTS ities; The following scientists attendoo
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