Abstract
The Fleet Structures Model simulates aspects of the structure and operation of a heterogeneous sea fishing fleet in order to make comparative appraisals of fisheries management strategies under varying assumptions about the behavioural environment. The model is dynamic, with predictions in yearly incremental steps which include interactions between expected changes in fleet structure, fleet performance, fish prices and the state of fish stocks. It is an analytic model, and is essentially deterministic but has stochastic elements relating to changes in fleet structure. This paper presents an overview of the model as developed by the Sea Fish Industry Authority and currently programmed for application to the appraisal of United Kingdom fleet management strategies. It also describes a conceptual structure which could be modified to accomodate the management of fleets with different characteristics. The modelling of the interaction of fleet performance with the state of stocks, the effects of effort and landings restrictions on fleet performance, the variation of fish prices, and changes in fleet structure are discussed in detail.
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