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Workshop on Harvest Control Rules for
Sustainable Fisheries Management13-15 September 2004
Organised by the Institute of Marine Research with the financial support kindly provided by the Nordic Fisheries Working Group / Nordic Council of Ministers
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Practical information
• Your hotel lends umbrellas
• Door code during the day time is 1357
• Workshop dinner today at 19:30
• Tomorrow there is a possibility to have a Thai-style take-away dinner here
• Fill your travel claims while in Bergen and return to us, or later to Solveig Skjønberg
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You arehere
You livehere
Potetkjelleren[Kong Oscarsgate 1a]
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Harvest Control Rules
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Harvest Control Rules
FAO Fisheries Glossary definition:Describes how harvest is intended to be controlled by management in relation to the state of some indicator of stock status. For example, a harvest control rule can describe the various values of fishing mortality which will be aimed at for various values of the stock abundance. It formalizes and summarizes a management strategy. Constant catch and constant fishing mortality are two types of simple harvest control rules. Restrepo V. (1999): Annotated Glossary of Terms in Executive Summary Reports of the International Commission for the Conservation of Atlantic Tunas´ Standing Committee on Research and Statistics (SCRS). ICCAT.
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Expectations
Objectives
Harvest Control Rule
Stock status Control
Evaluation of candidate HCRs
•Observation error•Uncertainty
•Implementation error
Evaluation of performance
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This workshop• Experience from harvest control rules in management of
fisheries in the Nordic seas• Expectations on HCRs and fisheries management by
various stakeholder (fisheries scientists, managers, fishermen, environmental groups)
• How theoretical analyses on HCRs can help us to understand the potential benefits and limitations of HCRs?
• Can objectives of all stakeholders be meaningfully represented in theoretical evaluations of HCRs?
• Comparisons of existing HCRs. Can they be improved?
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Who are we?
• 24 research scientists (16 outside IMR)
• 2 fisheries managers
• 2 representatives of fishing industry
• 1 representative of NGOs
• 1 science administrator
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Personal experience: blue whiting
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Personal experience: blue whiting
WGNPBW 2002 suggestion:
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Personal experience: blue whiting
WGNPBW 2003 Terms of Reference & response :
WGNPBW 2004 Terms of Reference & response:
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Personal experience: blue whiting
0
500
1000
1500
2000
2500
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
Year
Ca
tch
/ad
vice
(1
00
0 to
nn
)
Total catch
ICES advice
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Personal experience: blue whiting
0
5
10
15
20
25
30
35
40
45
50
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
Year
Rec
ruits
, age
1 (
1000
milli
on)
?
Shall strong recruitment continue?
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Challenges & questions
• HCRs (as we know them now) focus on single species – ecosystem aspects???
• Should information on the environment be a part of the input to a HCR?
• Exit rules/domain of validity: a HCR should be able to cope with some – but not all – variation in the fishery system
• Does increasing complexity help?
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