Examination of the extent to which the multispecies Schaefer Model is aquate approximation to the more general models leads to the conclusion that the globed results obtained by Pope only hold when the multispecies Schafer Model is the concreat model. This occurs because while the form of the model is appropriate in the point of equiliblium. The rational conclusions may be drawn from it, and in the it may even be possible to adjust the individual catchabilities and bend toward the overall MSY using method to the suggestion by Pope(1979). Further study will be need economically assessment and measurement of the Korean tuna fishery. Previously, almost discussed about, development, management, and regulations. Consequentely, most non-western countries need to development, but it is need management and regulation too. Above three issues that the first priority is development, therefore sometimes ignored management and regulations. Especially management not need hurry, the first of all fisheries must be developed even it fish resources developed thers still need for economic development not biological development. For instance, supply and demand of fish products, appropriate investment, employment, and infrastructure, in the future fisheries economic plans, etc. Therefore, non-western countries need to development fisheries economics. But management and regulation useful for fisheries development. Because non-western countries no need management and regulation, it is not true they are need to regulation and and management for their own fisheires development. In conclusion, non-western countries for management should be coneived and understood not as constraint upon rational erploitation but as an essential tool for the sound, sustained development of fisheries. Hence, management of fisheries is integral part of the development process. Joint ventures with both countries will be appeared same advantages and disadvantages. But more advantage along the joint ventures. Joint ventures developing fisheries resources will be attractive for both sides if they could produce additional volumes of fish for the foreign markets and offer an economically more effective way of resources utilization would be possible in non-cooperatives. Cooperation in fisheries between foreign distribute and developed nations can find a good future in the develoment of lower market values species in coastal nations which, represent a very large fishing potential. The benefit, and constraints for each joint ventures operation should be considered a case by case,