S C I E N C E F O R D E C I S I O N M A K E R S Southern Bluefin Tuna: Get ‘em while stocks last? James Findlay – BRS Friday 17 December Despite significant cuts in global catch in the mid-80s, the Southern Bluefin Tuna stock has fallen to dangerously low levels. Urgent management action is required to protect the species and the fisheries that depend upon it. However, since the 80s, it has been almost impossible to get international agreement on action to rebuild the stock and numerous countries have entered the global fishery and eroded the benefits of previous management. Australia will strive for effective international management but, if international agreement can’t be reached, should Australia take unilateral action to reduce its’ catch or “get ‘em while stocks last?”
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S C I E N C E F O R D E C I S I O N M A K E R S
Southern Bluefin Tuna:Get ‘em while stocks last?
James Findlay – BRSFriday 17 December
Despite significant cuts in global catch in the mid-80s, the Southern Bluefin Tuna stock has fallen to dangerously low levels. Urgent management action is required to protect the species and the fisheries that depend upon it. However, since the 80s, it has been almost impossible to get international agreement on action to rebuild the stock and numerous countries have entered the global fishery and eroded the benefits of previous management. Australia will strive for effective international management but, if international agreement can’t be reached, should Australia take unilateral action to reduce its’ catch or “get ‘em while stocks last?”
S C I E N C E F O R D E C I S I O N M A K E R S
Southern Bluefin Tuna: Get ‘em while stocks last?
James Findlay, BRS
S C I E N C E F O R D E C I S I O N M A K E R S
Photo: Kerstin Fritsches
S C I E N C E F O R D E C I S I O N M A K E R S
S C I E N C E F O R D E C I S I O N M A K E R S
Life History
• Relatively fast growing• Reaches 200cm and 200kg• Lives to 40+ yrs• Average age at first maturity – 12yrs
Assessment/Indicator Recent TrendConditioning Model ↓Length-Based VPA ↓Acoustic survey ↓Aerial survey ↓Catch-at- Age for All LL ↓Commercial Spotting ↓Taiwan LL CPUE ↔Juvenile Range ↓
S C I E N C E F O R D E C I S I O N M A K E R S
Any good news?
S C I E N C E F O R D E C I S I O N M A K E R S
S C I E N C E F O R D E C I S I O N M A K E R S
Ghost of SBT Future
S C I E N C E F O R D E C I S I O N M A K E R S
Management Procedure TAC Changes
00.20.40.6
0.81
1.21.4
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S C I E N C E F O R D E C I S I O N M A K E R S
S C I E N C E F O R D E C I S I O N M A K E R S
Parental Stock
00.5
11.5
22.5
33.5
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Management Choices
1. International agreement to cuts2. Australia alone takes cuts 3. Or……get ‘em while stock last
2003
S C I E N C E F O R D E C I S I O N M A K E R S
S C I E N C E F O R D E C I S I O N M A K E R S
BRS SEMINAR 2005Friday 4 February
Improving Climate Risk Management in Australia’s Southern Livestock Industries
Greg Laughlin - BRSSimon Knapp - BRSSimon Barry - BRS