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
Wes...
Commercial importance
-
5,000
10,000
15,000
20,000
25,000
30,000
35,000
Landings in 2011 (tonnes)
Celtic Sea
Irish Sea
Wes...
Commercial importance
-
5,000
10,000
15,000
20,000
25,000
30,000
35,000
Landings in 2011 (tonnes)
Celtic Sea
Irish Sea
Wes...
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)...
Management
Male only.
Quota
Creeling only
No restrictions but low effort
•Quota
•Skagerrak/Kattegat (IIIa)
•North Sea (IV)...
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...
Biology
Burrows
Muddy sediment
0 5 10
50
52
54
56
58
60
62
longitude
latitude
Fladen
MorayFirth
Noup
Firthof Forth
Devil's...
Biology
Burrows
Muddy sediment
0 5 10
50
52
54
56
58
60
62
longitude
latitude
Fladen
MorayFirth
Noup
Firthof Forth
Devil's...
Biology
Burrows
Muddy sediment
0 5 10
50
52
54
56
58
60
62
longitude
latitude
Fladen
MorayFirth
Noup
Firthof Forth
Devil's...
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
R...
1. Crescent shaped entrance
2. Scrape markings and
spoil
3. Entrances pointing to
centre.
4. Nephrops
1.
2.
3.
4.
What to ...
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
...
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
...
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
...
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
...
The future
Age determination
Automated video recognition
Further research into
burrow occupancy & size
Credit: (Left, Top ...
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SAGB2013 Dr Ewen Bell (Cefas)

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Transcript of "SAGB2013 Dr Ewen Bell (Cefas)"

  1. 1. Nephrops assessment: “the hole story” Dr Ewen Bell Senior Inshore Advisor Cefas, Lowestoft
  2. 2. 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
  3. 3. 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
  4. 4. 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
  5. 5. Fisheries 34
  6. 6. Fisheries Fladen ~12kt Irish Sea West ~8kt 34
  7. 7. Fisheries Fladen ~12kt Irish Sea West ~8kt 34
  8. 8. Fisheries Fladen ~12kt Irish Sea West ~8kt 34
  9. 9. Management
  10. 10. Management Male only. Quota
  11. 11. Management Male only. Quota Creeling only
  12. 12. Management Male only. Quota Creeling only No restrictions but low effort
  13. 13. 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
  14. 14. 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 ?!
  15. 15. Biology Burrows Muddy sediment Photos by Mars et al, UMBSM
  16. 16. 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
  17. 17. 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
  18. 18. 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
  19. 19. 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
  20. 20. Assessment objectives Stock Size
  21. 21. Assessment objectives Stock Size Fishing rate
  22. 22. Sledge deployment Aberdeen 1999 Cefas 2010
  23. 23. Sledge deployment Aberdeen 1999 Cefas 2010 Celtic Voyager Scotia Corystes Endeavour
  24. 24. Sledge deployment Aberdeen 1999 Cefas 2010 Celtic Voyager Scotia Corystes Endeavour
  25. 25. Sledge deployment Aberdeen 1999 Cefas 2010 Celtic Voyager Scotia Corystes Endeavour Wheel  GPS Incandescent bulbs  LED Ruler  laser DV  HDTV
  26. 26. 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
  27. 27. Interpreting the pictures
  28. 28. Interpreting the pictures Sometimes it’s easy
  29. 29. Interpreting the pictures Sometimes it’s easy Sometimes it’s not
  30. 30. Interpreting the pictures Sometimes it’s easy Sometimes it’s not
  31. 31. 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
  32. 32. 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
  33. 33. 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
  34. 34. 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
  35. 35. 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

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