Abstract
A host-parasite model is proposed to describe the dynamics of the P. decipiens complex life-cycle. Four developmental stages are considered: the adult worm in the final host's stomach, the larval stages in the invertebrate and fish hosts, and the free-living egg-larval stage. The dynamics of each stage are described by an ordinary differential equation. The sensitivity of the model to some parameter values forms the basis for a discussion of its potential use in the assessment of future management and control strategies. This is illustrated by examples of observed infections in cod ( Gadus morhua) from Scottish waters in the light of the recent increase in the Grey seal ( Halichoerus grypus) populations of the Orkney and Farne Islands.
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