Sammendrag
A bioeconomic model of a wild salmon (Salmo salar) river recreational fishery is formulated, and it is studied how economic and biological conditions influence harvesting, stock size and profitability. The demand is given by a falling demand curve in number of days, while the quality of the river, approximated by average catch per fishing day, shifts the demand up. On the supply side, there are a fixed number of owners managing the fishery under the assumption of profit maximising. Two resource management regimes are studied. Within what is called Regime 1, the owners do not take into account that this years fishing effort influences next years stock size, and hence, the fish stock does not carry any shadow price. In Regime 2, which also is the social planner�s solution, the owners maximise profit with respect to the stock size, in addition to the number of fishing licences per day sold. It is demonstrated that a serious degree of economic as well as ecological over-fishing may take place within Regime1, while the recreational anglers may still prefer this regime. Various policy measures to counteract over-fishing are studied, and it is analysed how these measures influence the distributional surplus. In the last part of the paper, the model is illustrated with ecological and economic data which fits reasonably well with the river Imsa in Rogaland county Norway.
Vis fullstendig beskrivelse
