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FISKEN OG HAVET Nr nr. 8/2011 HAVET Survey strategy for monitoring 1orZegian GeeSsea ÀsK sSeFies Alf Harbitz, Benjamin Planque, Elvar Hallfredsson and Ole Thomas Albert FISKEN OG Distribusjon: PROSJEKTRAPPORT Åpen Prosjektnr.: 13327 Oppdragsgiver(e): Nordnesgaten 50, Postboks 1870 Nordnes, 5817 BERGEN Tlf. 55 23 85 00, Faks 55 23 85 31, www.imr.no Oppdragsgivers referanse: Tromsø Flødevigen 9294 TROMSØ 4817 HIS Rapport: Nr. - År Dato: Fisken og Havet 8-2011 31.12.11 Tittel (norsk/engelsk): Program: Survey strategy for monitoring Norwegian deep-sea fish Norskehavet species Faggruppe: Dyphavsarter Toktstrategi for overvåkning av norske dyphavsarter Forfatter(e): Antall sider totalt: Alf Harbitz, Benjamin Planque, Elvar Hallfredsson and Ole Thomas Albert 31 Sammendrag (norsk): Rapporten dokumenterer resultatene fra prosjekt 13327 med formål å etablere metoder for overvåking av dypvannsarter. Etter presentasjon av prosjektets mandat og bakgrunnsinformasjon om tidligere tokt og deres rolle for råd og forskning, er en generell metode for toktevaluering presentert. Videre er spesifikke aspekter ved survey design evaluert med kvantitative metoder. Basert på resultatene av disse analysene, er en multiårlig surveystrategi foreslått. Den bygger på tre kjernetokt: To tokt langs Eggakanten ca. 62qN – 75qN (Egga Sør) og 62qN – 80qN (Egga Nor), og et tokt i Norskehavet (”dyp-pelagisk” Norskehavstokt). Egga Nor og Egga Sør bør bli gjennomført annenhvert år, alternerende, mens timeplanen for det dyp-pelagiske norskehavstoktet bør defineres i henhold til anbefalinger fra ICES-WGRS. I tillegg bør dypvannsstasjoner opprettholdes på økosystemtoktet i Barentshavet og på reketoktet i Nordsjøen (Norskerenna). Denne nye strategien innebærer en betydelig reduksjon i årlig seiletid sammenlignet med tidligere år, også for 2011 der alle toktene er planlagt gjennomført. Summary (English): This document reports on the results of the project 13327 on establishing methods for the surveillance of deepwater resources. After a presentation of the project mandate and background information on past surveys and their role for advice and research, a general method for survey evaluation is presented and specific aspects of survey design are evaluated with quantitative methodologies. Based on the results of these analyses, a multiannual survey strategy is proposed. It is build on three core surveys: two surveys along the continental slope approximately 62°N-75°N (Egga Sør) and 62°N-80°N (Egga Nor), and a survey in the Norwegian Sea (“open sea deepwater”). Egga Nor and Egga Sør should be conducted every two year, alternating, while the schedule of the “open sea deepwater” survey should be defined in accordance with recommendations from ICES- WGRS. Additionally deepwater stations should be maintained on ecosystem survey in the Barents Sea and on shrimp survey in the North Sea (Norwegian Trench). This new survey strategy offers a 3 substantial reduction in requested annual ship-time in comparison with recent years, even for 2011 when all three surveys should be conducted. Emneord (norsk): Subject heading (English): 1. Flerårlig toktdesign 1. Multi-annual survey design 2. Saktevoksende bestander 2. Slow-growing species 3. Toktevaluering 3. Suvrey evaluation 4 Content 1 Abstract and Recommendations ........................................................................................................................ 7 1.1 Abstract ...................................................................................................................................................... 7 1.2 Recommendations ...................................................................................................................................... 7 2 Mandate ..................................................................................................................................................... 8 3. Background 9 3.1 General context .......................................................................................................................................... 9 3.2 Role of surveys for DW fisheries science and advice. ............................................................................. 10 3.3 Expectations for DW ecosystems and species at IMR. ............................................................................ 11 4. Overview of past and current surveys ............................................................................................................. 13 5. Evaluation of DW surveys with multiple goals – expectations and ................................................................ 16 evaluation criteria ............................................................................................................................................. 16 5.1 Information/data expectations and constrains .......................................................................................... 16 5.2 The following evaluation criteria are recommended to evaluate different survey strategies:.................... 16 6. Quantitative Analysis of present DW surveys ................................................................................................. 18 6.1 Introduction .............................................................................................................................................. 18 6.2 The annual Egga survey, Aug-Sep 1994-2009 ......................................................................................... 18 Visualization of the spatial distribution of biomass density ......................................................................... 18 Abundance estimation .................................................................................................................................. 19 Conclusions .................................................................................................................................................. 20 6.3 The seasonal Greenland halibut project surveys 2003-2005 .................................................................... 21 Conclusions .................................................................................................................................................. 23 6.4 The annual Juvenile Greenland halibut survey 1996-2009 ...................................................................... 23 Conclusions .................................................................................................................................................. 25 6.5 Demersal trawl gears ................................................................................................................................ 25 Conclusions .................................................................................................................................................. 26 7. A new survey strategy, with evaluation of performance ................................................................................. 26 7.1 Core deepwater surveys: .......................................................................................................................... 26 Egga Nord 26 Egga Sør 27 Open Sea Deep water ................................................................................................................................... 27 7.2 Deepwater sampling from other surveys .................................................................................................. 27 Ecosystem survey ......................................................................................................................................... 27 Winter survey ............................................................................................................................................... 27 Coastal and Fjord survey .............................................................................................................................. 27 Norwegian shrimp survey in the Skagerrak and the Norwegian Deep .......................................................... 28 7.3 WGNAPES: North Atlantic Pelagic Ecosystem Survey .......................................................................... 28 7.4 New survey strategy ................................................................................................................................ 28 5 6 1 Abstract and Recommendations 1.1 Abstract A multiannual survey strategy is proposed, based on three core surveys: “Egga Nor”, “Egga Sør” and “open sea deepwater”. Egga Nor and Egga Sør should be conducted every two years, alternating, while the schedule of the “open sea deep water” should be defined in accordance with ICES-WGRS recommendations. All three surveys should be conducted in 2011. 1.2 Recommendations Based on analyses of available deep-water surveys, the following recommendations are made: 1. Egga Nor is the key Greenland halibut survey. The adult Greenland halibut survey along the continental slope in August using Alfredo trawl (the Egga Nor-survey) is the key survey for this species and provides consistent and reliable indices of as well abundance as of stock composition. This survey is necessary for stock assessment and management advice on Greenland halibut and provides important additional data for advice on other parts of the deep-sea eco-region. 2. Restricted annual Greenland halibut sampling is sufficient for stock monitoring. The Egga Nor survey provides information on Greenland halibut age-groups from the late juveniles and upwards. For the mature part of the stock, the
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