Atlantic Bluefin Tuna: Superfish of the oceans Dr Lucy Hawkes Frank - - PowerPoint PPT Presentation

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Atlantic Bluefin Tuna: Superfish of the oceans Dr Lucy Hawkes Frank - - PowerPoint PPT Presentation

Jan 13, 2023 151 likes •681 views

Atlantic Bluefin Tuna: Superfish of the oceans Dr Lucy Hawkes Frank Buckland Museum of Economic Fish Culture, 1865 Vinegar 275 kg 243 kg 286 kg 270 kg 301 kg 287 kg Scarborough Sir Francis Russell Aboard the St George Superfish

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Atlantic Bluefin Tuna: ‘Superfish’ of the oceans

Dr Lucy Hawkes

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Frank Buckland

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Museum of Economic Fish Culture, 1865

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Vinegar

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Scarborough 243 kg 286 kg 270 kg 301 kg 287 kg 275 kg

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Sir Francis Russell Aboard the St George

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Superfish

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Dorsal Anal Belly Fat content (%)

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Even in freezing water: 20-24 °C Norway

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Gills

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Gills

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Brown trout 593 cm2

(24 x 24 cm) 80 cm

Rainbow trout 1,767 cm2

(42 x 42 cm) 75 cm

Common carp 2,177 cm2

(47 x 47 cm) 80 cm

Bluefin tuna 287 m2

(17 x 17 m) 2.4 m (80 cm = 95 m2)

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2500 mg O2.kg-1.hr-1

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0 5 10 15 20 25 30 35 300 250 200 150 100 50

Age (year) Fork length (cm)

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* * *

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* * *

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4 to 9 years old

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Purse seining

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Tuna “ranching”

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Reduction of >50% in 3 generations

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Less well off than…

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Country Quota (tonnes) Albania 156 Algeria 1,446 China 90 Egypt 266 EU 17,623 Iceland 147 Japan 2,544 Korea 184 Libya 2,060 Morocco 2,948 Norway 239 Syria 73 Tunisia 2,400 Turkey 1,880 Taipei 84 TOTAL 32,240 60,000 - 180,000 fish

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Lands End, Charles Hood

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“What objection can be reasonably argued against the employment of revenue cruisers for the accommodation of naturalists, appointed by government… in

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that they make a thoroughly practical examination of the dark and mysterious habits of food fishes.”

  • Frank Buckland
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Western Eastern

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Isle of Harris, Scotland

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Thank you!