THE BEST ECONOMIC RESULT FOR THE FISHERIES OF THE SPANISH MACKEREL

The fishery of the spanish mackerel (Scomberomorus niphonius Guvier Valen-nes) is one of important fisheries in the areas of the Yellow Sea and Pohai Sea. Wehave adopted the the bioeconomio model which is based on both Scheafer model andFox model, to discuss the problem of profit, energy consumption and employment ofthe fishery. The values of the maximum revenue (U_max),optimum economic effort(f_eop) and optimum energy consumption (O_opt) were estimated. These values are pres-ented in table 2. If the bed economic result is the managemen objective of the fisherywe can get the maximum revenue (U_max)=19.65 millions) and the optimum energyconsumption when the level of the effort is (f_eop=2900). Comparing to the resultobtained from the management objective of maximum sustained yield, the revenuewould increase 15. 5% and the energy consumption would be decreasd 26.8%. But theyield would reduce 7.2% about 2000 tons. If the employment is the management ob-jective of the fisheries, the effort might be controlled to 5400. Comparing to the resultof the best economic result. the employment would be increased 76.8%, but the reveuewould reduce 35.2% and the energy consumption would be increased 78.9%.