ices how to count fish for management
TRANSCRIPT
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ICES provides advice on state, exploitation and management targets for fish stocks
How?
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Information from fish
• Length
• Weight
• Age
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Information on population trends: surveys
• Trawls• Acoustics• Plankton• TV
Research vessels & industry
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Information from catch
• Amount• Location• Timing• Bycatch
From ports, log books & observers
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How do we use this information?Take a stock of fish:
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Every stock has underlying structure
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Add fishing…
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Mortality rate
Change in thenumbers at age
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We also measure the catch
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• Observed mortality rates
• Catches recorded
Equations and simulations are used to combine the information.
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Also observations of trends in populationsfrom surveys.
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This produces a stock assessment
North Sea herring
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To provide the advice for next year’s catches
We project forward with our best knowledge(maturity, growth, recruits, impact of fishing gear, natural death etc) across a range of fishing scenarios.
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Scenarios set out in management plans
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All management plans in the ICES area are tested using simulations
Simulations of Atlantic mackerel multiannual management strategy at different fishing mortalities
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Framework for advice
International agreements and policies:• UN Convention on the Law of the Sea (UNCLOS 1982) -MSY• UN Conference on Environment and Development (UNCED, 1992) -precautionary approach• UN Straddling Fish Stocks Agreement of 1995 (UNFSA 1995) - precautionary approach• Convention on Biological Diversity (UN CBD, 1992) - ecosystem approach• Johannesburg Declaration of the World Summit on Sustainable Development (WSSD UN 2002)-
ecosystem approach & MSY
National and regional legislation:including CFP, MSFD, Norwegian Marine Resources Act, Russian Federal Law on Fisheries, Icelandic Fisheries Management Act, Faroe Islands Fisheries Management Act
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Reference pointsPrecautionary Approach
Populations need to be maintained within safe biological limits -Certain that reproductive success is not impaired
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Reference pointsmaximum sustainable yield (MSY)
ICES interpretation of MSY is maximization of average long-term yield from sustainable stocks
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Reference pointsmaximum sustainable yield (MSY)
Ecosystem Approach
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Use of reference points: current and future
North Sea herring
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State of the stocks North Sea overview