Abstract
The population dynamics of viral lymphocystis disease in an age‐structured population of flounder, Plarichthys flesus (Linnaeus 1758), is studied with a mathematical model. For a single cohort the model illustrates the influence of host density and acquired immunity on length‐prevalence profiles. This case corresponds to a host population at demographic equilibrium. When the model is extended to several cohorts, seasonal recruitment of susceptible hosts is shown to drive seasonality in disease prevalence. In both cases, there is good qualitative agreement between model predictions and field data from the Elbe estuary, Germany.
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