Construct a general bio-economic model applicable to each case study for which there exist appropriate data. Data requirements Construct a general bio-economic model applicable to each case study for which there exist appropriate data. Data requirements 1. Stocks 2. Harvest 3. Costs 4. Revenue
The model should be The model should be 1. Dynamic 3. Capable of incorporating various management regimes The model should be as simple as possible (one cohort) to facilitate computations. Probably Matlab-based.
Sustainable utilisation of marine resources in the presence of volatile environment, both in the ecological, physical and economic sense. Sustainable utilisation of marine resources in the presence of volatile environment, both in the ecological, physical and economic sense. Based on a feedback model developed by Sandal and Steinshamn (1997a, 1997b, 2001a).
Feedback; optimal control (harvest) is a direct function of the state variable (stock) Feedback; optimal control (harvest) is a direct function of the state variable (stock) Deterministic and stochastic version Multi-species; cod and capelin, herring and cod Aggregate model
Logistic growth functions Logistic growth functions Linear profit functions Non-linear cost function Interaction between species (cod and herring/capelin)
Revenue functions Revenue functions Cost functions
Introduced in 1995 Introduced in 1995 25% of fishable stock (average of estimate at beginning of year and prediction for next year) 155 thousand ton minimum Change in 2000 minimum abolished 30 thousand ton limit on TAC-changes from year to year Change in 2006 30 thousand ton limit abolished
Change in 2006 Change in 2006 Average of 25% of estimated stocks at the beginning of the year and last year catches 30 thousand ton limit abolished Change in 2007 TAC set at 130 thousand tons for the fishing year 2007/2008 Average of 20% of estimated stocks, but a 130 thousand ton minimum
A harvest control rule can only be effective if A harvest control rule can only be effective if Actual and projected (TAC) catches are the same
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