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Adaptive Management of living Marine Resources by integrating different data

sources and key ecological parameters (ADMAR)

Nils Olav Handegard

(2)

The challenges

• Norwegian Ocean Resource Act

– How to address ”data-poor” stocks

• How to utilize a larger part of our

knowledgebase in management advice?

• Survey resource allocation

(3)

The challenges

(4)

The proposed solution

(5)

Simulation framework for evaluating HCR

Simulation model

Ecosystem model Simulate

observations Data

Commercial sampling Scientific surveys

Our approach

Acoustic surveys Trawl surveys

Catch sampling Landings

Set up simulation framework Use data rich species as cases

Evaluate HCR under different scenarios

-Reduce data richness -> when does the HCR break down?

-Add error structures to data Parsimonous assessment

model (state space model) Harvest control rules State

transition model Observation

model e=y-yp

EcoHCR

Model fields Interactions Ambient env var

HCR

(6)

Overview of the project

Jon Helge Vølstad, IMR

Mette Mauritzen, IMR

Leif Chr Stige, CEES Dag Hjermann, CEES Project leader: Nils Olav Handegard, IMR

Co-project leader: Nils Christian Stenseth, CEES

Referanser

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