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Scottish Nephrops Survey Phase III: Evaluation of Measures For Nova Southeastern University NSUWorks Marine & Environmental Sciences Faculty Reports Department of Marine and Environmental Sciences 5-1-2013 Scottish Nephrops Survey Phase III: Evaluation of Measures for Reducing Bycatch and Discards in a Nephrops Fishery Rosanna Milligan University of Glasgow - United Kingdom, [email protected] Amaya Albalat University of Glasgow - United Kingdom Douglas Neil University of Glasgow - United Kingdom Find out more information about Nova Southeastern University and the Halmos College of Natural Sciences and Oceanography. Follow this and additional works at: https://nsuworks.nova.edu/occ_facreports Part of the Marine Biology Commons, and the Oceanography and Atmospheric Sciences and Meteorology Commons NSUWorks Citation Rosanna Milligan, Amaya Albalat, and Douglas Neil. 2013. Scottish Nephrops Survey Phase III: Evaluation of Measures for Reducing Bycatch and Discards in a Nephrops Fishery : i-X, 1 -112. https://nsuworks.nova.edu/occ_facreports/104. This Report is brought to you for free and open access by the Department of Marine and Environmental Sciences at NSUWorks. It has been accepted for inclusion in Marine & Environmental Sciences Faculty Reports by an authorized administrator of NSUWorks. For more information, please contact [email protected]. Scottish Nephrops Survey Phase III Evaluation of measures for reducing bycatch and discards in a Nephrops fishery Ms Rosanna Milligan, Dr Amaya Albalat & Professor Douglas Neil Langoustine Lab., University of Glasgow May 2013 The Scottish Government Rural Affairs and the Environment: Marine Directorate European Fisheries Fund Project NC/3/19 Contents Preamble: Extracts from the application.......................................................................... III Sustainable development of fisheries............................................................................. III Brief description of project.............................................................................................. V Project outline................................................................................................................ VII Project aims.................................................................................................................... VIII Planned schedule of activities/work…………………………………………………………………………. IX Scientific Report.............................................................................................................. 1 Work Package 3.1: Bycatch composition and implementation of a self-assessment scheme in the North Minch Nephrops trawl fishery 1 Introduction.................................................................................................................... 1 The North Minch Nephrops Fisheries................................................................. 3 Objectives of Workpackage 3.1.......................................................................... 6 Section 1 of Workpackage 3.1: Catch Composition and Key Species ............................ 8 Cod, Haddock and Whiting................................................................................. 10 Spurdog.............................................................................................................. 13 Nephrops norvegicus.......................................................................................... 16 Methodology.................................................................................................................. 17 Part A: Catch Composition.................................................................................. 17 Study Area........................................................................................................... 24 Part B: Key Species.............................................................................................. 24 Cod, Haddock & Whiting..................................................................................... 25 Spurdog............................................................................................................... 25 Nephrops............................................................................................................. 26 Data Analysis....................................................................................................... 26 Calculating the Number of Nephrops.................................................................. 27 Results............................................................................................................................. 29 Species Composition and Broad Trends.............................................................. 29 Relationships Between Catches: Species Abundance......................................... 34 Relationships Between Catches: Biomass........................................................... 38 Key Species.......................................................................................................... 40 Cod....................................................................................................................... 40 Haddock………………………………………………………………………………………………..….…….. 44 Whiting.............................................................................................................. 48 Spurdog.............................................................................................................. 52 Age..................................................................................................................... 55 Nephrops............................................................................................................ 57 Discussion...................................................................................................................... 61 I Section 2 of Workpackage 3.1: Self-Assessment of Bycatch & Discards..................... 64 Introduction................................................................................................................. 64 Youngstrace..................................................................................................... 65 Self-assessment methodology......................................................................... 65 Feedback from fishermen................................................................................ 67 Validation of self-assessment methodology.................................................... 68 Results......................................................................................................................... 70 Discussion.................................................................................................................... 76 Deliverables................................................................................................................. 77 Acknowledgements..................................................................................................... 78 References................................................................................................................... 78 Work Package 3.2: Identifying the most cost-effective way to obtain omega-3 lipids and other nutraceutical compounds from Nephrops heads – a currently discarded portion of the catch……………………………………………………………………………….. 81 Introduction................................................................................................................. 81 Materials and methods................................................................................................ 83 Capture and transport………………………………………………………………………………… 83 Head paste and tissue sample preparation……………………………………………….… 84 Lipid extraction................................................................................................ 84 Lipid class analysis………………………………………………………………………………………. 85 1H NMR spectroscopy…………………………………………………………………………………. 86 Fatty acid analysis…………………………………………………………………………………….… 86 HPLC with Full Scan HRFTESIMS-Orbitrap…………………………………………………… 87 Results and Discussion................................................................................................. 89 Norway lobster head paste samples from different fishing grounds…………… 89 Norway lobster tissue samples from the Clyde area…………………………………… 91 Lipid class analysis……………………………………………………………………………….……… 96 1H NMR spectroscopy of Norway lobster lipid extracts…………………………….… 98 Fatty acid analysis………………………………………………………………………………………. 104 Analysis of Norway lobster samples using HPLC with full scan HRFTESIMS… 105 Conclusions................................................................................................................ 110 Deliverables................................................................................................................ 110 Acknowledgements.................................................................................................... 111 References.................................................................................................................. 111 II Scottish Nephrops Survey Phase III Evaluation of measures for reducing bycatch and discards in a Nephrops fishery European Fisheries Fund Project NC/3/19 Preamble: Extracts from the application Sustainable development of fisheries One of the principal drivers behind the implementation of Phase III of the Scottish Nephrops Survey is to maximise sustainability of the Nephrops sector in Scotland. The Nephrops fishery is the most valuable in Scotland, with landings worth an estimated £89.3m in 2006. Most landings are made by demersal trawlers, from
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