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SAGB2013 Dr Ewen Bell (Cefas)
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SAGB2013 Dr Ewen Bell (Cefas)

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SAGB2013 Dr Ewen Bell (Cefas) SAGB2013 Dr Ewen Bell (Cefas) Presentation Transcript

  • Nephrops assessment: “the hole story” Dr Ewen Bell Senior Inshore Advisor Cefas, Lowestoft
  • Commercial importance - 5,000 10,000 15,000 20,000 25,000 30,000 35,000 Landings in 2011 (tonnes) Celtic Sea Irish Sea West of Scotland North Sea ICES Landings & MMO annual statistics
  • Commercial importance - 5,000 10,000 15,000 20,000 25,000 30,000 35,000 Landings in 2011 (tonnes) Celtic Sea Irish Sea West of Scotland North Sea >£100 million to UK ICES Landings & MMO annual statistics
  • Commercial importance - 5,000 10,000 15,000 20,000 25,000 30,000 35,000 Landings in 2011 (tonnes) Celtic Sea Irish Sea West of Scotland North Sea >£100 million to UK 1 Nephrops £111 2 Mackerel £107 3 Scallops £63 4 Monks or Anglers £40 5 Crabs £38 6 Haddock £35 7 Lobsters £32 8 Cod £28 9 Sole £16 10 Herring £15 ICES Landings & MMO annual statistics
  • Fisheries 34
  • Fisheries Fladen ~12kt Irish Sea West ~8kt 34
  • Fisheries Fladen ~12kt Irish Sea West ~8kt 34
  • Fisheries Fladen ~12kt Irish Sea West ~8kt 34
  • Management
  • Management Male only. Quota
  • Management Male only. Quota Creeling only
  • Management Male only. Quota Creeling only No restrictions but low effort
  • Management Male only. Quota Creeling only No restrictions but low effort •Quota •Skagerrak/Kattegat (IIIa) •North Sea (IV) •West of Scotland (VI) •Irish & Celtic Seas (VII) •Biscay •Northern Spain •Portuguese
  • Management Male only. Quota Creeling only No restrictions but low effort •Quota •Skagerrak/Kattegat (IIIa) •North Sea (IV) •West of Scotland (VI) •Irish & Celtic Seas (VII) •Biscay •Northern Spain •Portuguese ?!
  • Biology Burrows Muddy sediment Photos by Mars et al, UMBSM
  • Biology Burrows Muddy sediment 0 5 10 50 52 54 56 58 60 62 longitude latitude Fladen MorayFirth Noup Firthof Forth Devil's Hole Farn Deeps Norwegian Deep Botney Gut Off Horn's Reef Skagerrak Kattegat Redistribution Photos by Mars et al, UMBSM
  • Biology Burrows Muddy sediment 0 5 10 50 52 54 56 58 60 62 longitude latitude Fladen MorayFirth Noup Firthof Forth Devil's Hole Farn Deeps Norwegian Deep Botney Gut Off Horn's Reef Skagerrak Kattegat Redistribution Feeding Eat anything! Photos by Mars et al, UMBSM
  • Biology Burrows Muddy sediment 0 5 10 50 52 54 56 58 60 62 longitude latitude Fladen MorayFirth Noup Firthof Forth Devil's Hole Farn Deeps Norwegian Deep Botney Gut Off Horn's Reef Skagerrak Kattegat Redistribution Feeding Eat anything! Photos by Mars et al, UMBSM
  • Biology Burrows Muddy sediment 0 5 10 50 52 54 56 58 60 62 longitude latitude Fladen MorayFirth Noup Firthof Forth Devil's Hole Farn Deeps Norwegian Deep Botney Gut Off Horn's Reef Skagerrak Kattegat Redistribution Feeding Eat anything! Growth by moult Photos by Mars et al, UMBSM
  • Assessment objectives Stock Size
  • Assessment objectives Stock Size Fishing rate
  • Sledge deployment Aberdeen 1999 Cefas 2010
  • Sledge deployment Aberdeen 1999 Cefas 2010 Celtic Voyager Scotia Corystes Endeavour
  • Sledge deployment Aberdeen 1999 Cefas 2010 Celtic Voyager Scotia Corystes Endeavour
  • Sledge deployment Aberdeen 1999 Cefas 2010 Celtic Voyager Scotia Corystes Endeavour Wheel  GPS Incandescent bulbs  LED Ruler  laser DV  HDTV
  • 1. Crescent shaped entrance 2. Scrape markings and spoil 3. Entrances pointing to centre. 4. Nephrops 1. 2. 3. 4. What to look for Burrows NOT holes
  • Interpreting the pictures
  • Interpreting the pictures Sometimes it’s easy
  • Interpreting the pictures Sometimes it’s easy Sometimes it’s not
  • Interpreting the pictures Sometimes it’s easy Sometimes it’s not
  • Turning TV pictures to advice 2 4 6 8 2468 Station= 4 CCC= 0.715 : Pearson= 0.744 199:KRB00 1:PWJ00 2 4 6 8 10 2468 Block t[,1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1.02.03.04.0 Station= 5 CCC= 0.041 : Pearson= 0.046 249:JME00 4:KRB00 2 4 6 8 10 1.02.03.04.0 Block t[,1] Training & validation
  • Turning TV pictures to advice 2 4 6 8 2468 Station= 4 CCC= 0.715 : Pearson= 0.744 199:KRB00 1:PWJ00 2 4 6 8 10 2468 Block t[,1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1.02.03.04.0 Station= 5 CCC= 0.041 : Pearson= 0.046 249:JME00 4:KRB00 2 4 6 8 10 1.02.03.04.0 Block t[,1] Training & validation Raise observations to total area Assumptions: 1 per burrow >17mm Burrows collapse quickly
  • Turning TV pictures to advice 2 4 6 8 2468 Station= 4 CCC= 0.715 : Pearson= 0.744 199:KRB00 1:PWJ00 2 4 6 8 10 2468 Block t[,1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1.02.03.04.0 Station= 5 CCC= 0.041 : Pearson= 0.046 249:JME00 4:KRB00 2 4 6 8 10 1.02.03.04.0 Block t[,1] Training & validation Raise observations to total area Assumptions: 1 per burrow >17mm Burrows collapse quickly Harvest rate Numbers caught / population
  • Turning TV pictures to advice 2 4 6 8 2468 Station= 4 CCC= 0.715 : Pearson= 0.744 199:KRB00 1:PWJ00 2 4 6 8 10 2468 Block t[,1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 1.02.03.04.0 Station= 5 CCC= 0.041 : Pearson= 0.046 249:JME00 4:KRB00 2 4 6 8 10 1.02.03.04.0 Block t[,1] Training & validation Harvest rate for MSY Raise observations to total area Assumptions: 1 per burrow >17mm Burrows collapse quickly Harvest rate Numbers caught / population
  • The future Age determination Automated video recognition Further research into burrow occupancy & size Credit: (Left, Top and Bottom) Raouf Kilada/University of New Brunswick; (Top Right) NOAA; (Bottom Right) iStockphoto