Report of the Northern Pelagic and Blue Whiting Fisheries Working Group (Wgnpbw)
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ICES WGNPBW REPORT 2006 ICES ADVISORY COMMITTEE ON FISHERY MANAGEMENT ICES CM 2006/ACFM:34 REPORT OF THE NORTHERN PELAGIC AND BLUE WHITING FISHERIES WORKING GROUP (WGNPBW) 24-30 AUGUST 2006 ICES HEADQUARTERS International Council for the Exploration of the Sea Conseil International pour l’Exploration de la Mer H.C. Andersens Boulevard 44-46 DK-1553 Copenhagen V Denmark Telephone (+45) 33 38 67 00 Telefax (+45) 33 93 42 15 www.ices.dk [email protected] Recommended format for purposes of citation: ICES. 2006. Report of the Northern Pelagic and Blue Whiting Fisheries Working Group (WGNPBW), 24-30 August 2006, ICES Headquarters. ICES CM 2006/ACFM:34. 294 pp. For permission to reproduce material from this publication, please apply to the General Secretary. The document is a report of an Expert Group under the auspices of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council. © 2006 International Council for the Exploration of the Sea. ICES WGNPBW Report 2006 i Contents Executive Summary ......................................................................................................... 1 1 Introduction ............................................................................................................. 2 1.1 Participants ...................................................................................................... 2 1.2 Terms of Reference ......................................................................................... 2 2 Ecological considerations ........................................................................................ 4 2.1 Ecosystem overview........................................................................................ 4 2.1.1 Barents Sea ......................................................................................... 4 2.1.2 Norwegian Sea.................................................................................... 4 2.1.3 Icelandic waters .................................................................................. 7 2.1.4 Hydrography of the waters west of the British Isles........................... 8 2.2 Ecosystem impact on the fish stocks ............................................................... 8 2.2.1 Norwegian spring spawning herring................................................... 8 3 Norwegian Spring Spawning Herring.................................................................. 24 3.1 Stock description ........................................................................................... 24 3.1.1 General.............................................................................................. 24 3.1.2 Changes in migration........................................................................ 24 3.2 ICES advice and management applicable to 2005 and 2006 ......................... 25 3.3 Description and development of the fisheries in 2005................................... 26 3.3.1 Denmark ........................................................................................... 26 3.3.2 Germany ........................................................................................... 26 3.3.3 Faroe Islands..................................................................................... 27 3.3.4 Iceland .............................................................................................. 27 3.3.5 Ireland............................................................................................... 27 3.3.6 Netherlands....................................................................................... 28 3.3.7 Norway ............................................................................................. 28 3.3.8 Russia................................................................................................ 28 3.3.9 Sweden.............................................................................................. 29 3.3.10 UK (Scotland)................................................................................... 29 3.3.11 Poland ............................................................................................... 29 3.3.12 France ............................................................................................... 29 3.4 Bycatches in the fishery................................................................................. 29 3.5 Fishery dependent data .................................................................................. 29 3.5.1 Sampling intensity ............................................................................ 29 3.5.2 Landings ........................................................................................... 29 3.5.3 Discards ............................................................................................ 30 3.5.4 Age and length composition of catches ............................................ 30 3.5.5 Weight at age .................................................................................... 31 3.5.6 Length at age .................................................................................... 31 3.5.7 Maturity at age.................................................................................. 31 3.5.8 Natural Mortality .............................................................................. 32 3.6 Fisheries independent data............................................................................. 32 3.6.1 Survey abundance indices................................................................. 32 3.6.2 Tagging data ..................................................................................... 35 3.7 Stock Assessment .......................................................................................... 36 3.7.1 Catch curve analyses......................................................................... 36 3.7.2 Data Exploration with assessment models........................................ 36 3.7.3 Comparison of results of different assessments................................ 43 ii ICES WGNPBW Report 2006 3.7.4 Final Assessment .............................................................................. 44 3.8 Recruitment estimates.................................................................................... 44 3.9 Forecast ......................................................................................................... 45 3.9.1 Short term forecast............................................................................ 45 3.10 Biological reference points............................................................................ 45 3.11 Management considerations .......................................................................... 45 3.12 Quality of the data and the assessment .......................................................... 45 3.13 Recommendations ......................................................................................... 47 4 Blue whiting ......................................................................................................... 126 4.1 Stock description ......................................................................................... 126 4.2 ICES advice and management applicable to 2005 and 2006 ....................... 126 4.2.1 Management plan for the blue whiting fishery ............................... 127 4.2.2 NEAFC regulatory measurements .................................................. 128 4.3 Description and development of the fisheries in 2005................................. 129 4.3.1 Denmark ......................................................................................... 129 4.3.2 Germany ......................................................................................... 129 4.3.3 Faroe Islands................................................................................... 130 4.3.4 France ............................................................................................. 130 4.3.5 Iceland ............................................................................................ 130 4.3.6 Ireland............................................................................................. 131 4.3.7 Netherlands..................................................................................... 131 4.3.8 Norway ........................................................................................... 131 4.3.9 Portugal........................................................................................... 132 4.3.10 Russia.............................................................................................. 132 4.3.11 Spain............................................................................................... 132 4.3.12 Sweden............................................................................................ 133 4.3.13 UK (Scotland)................................................................................. 133 4.4 Bycatches in the fishery............................................................................... 133 4.4.1 Icelandic investigations (land based sampling) .............................. 133 4.4.2 Faroese investigations at sea........................................................... 134 4.5 Fishery dependent data ................................................................................ 134 4.5.1 Sampling intensity .......................................................................... 134 4.5.2 Landings ........................................................................................