蓝点鲅渔业的最佳经济效果

蓝点鲅（Scomberocmorus Niphonius Cuvier & Valennes）是我国渔业的重要捕捞对象之一。本文用生物经济模式（基于 Schaefer 模式和 Fox 模式）讨论了蓝点鲅渔业的经济效益、能源消耗和就业等问题。对其最大经济效益(U_max)、最适能源消耗(O_opt)和最适经济捕捞努力量(f_oop)等数值作了估算,列于表2。如果以最大经济效益为这个渔业的管理目标,将捕捞努力量控制在最适经济捕捞努力量水平(f_oop 约为 290O),就能获得最大经济效益(U_max=19.65百万元)。把这个结果与最大持续产量的结果相比,渔业的经济效益将增加15.5%,能源消耗减少26.8%,但产量将下降7.2%,约2000吨。如果以增加就业为这个渔业的管理目标,捕捞努力量可控制在5400左右、和最大经济效益的结果相比,捕捞力量可多安排76.8%,但是渔业经济效益下降35.2%,能源消耗将增加78.9%。

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%.