This paper reports the results of an investigation of the demand for fish at the quayside level in the United Kingdom. A demand system is formulated to explain the shares of total fish expenditure which are accounted for by the imports of fresh and frozen fish, the imports of shellfish, and the landings of fish and shellfish by British vessels. In particular, a Generalised Addilog demand model is specified and estimated with annual data over the period 1966 to 1980. The system is extended by disaggregating the imports of fresh and frozen fish into four components: salmon and trout, and other fresh and frozen fish, distinguishing in each case between European and non-European supply sources. The estimated share equations then form the basis of a simple simulation model, which in turn is used to provide forecasts to 1985.