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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?