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The economic and technical properties of super freezing deep-sea tuna long liner are analyzed by using system analysis method based on plentiful relevant data. First, the mathematical model of goal function is established and analyzed. Then the optimum ship type under single goal is determined by th

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The choice of Tuna long line¬ðs technical and operational parameters has a great impact on the catch result. Hook depth is the most important parameter for the deep-sea Tuna long line. Technical and operational parameters concerned and the relation between them are analyzed in this paper. The determi

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Longline fishing is the main method in the tuna fishery in China.In order to increase the catch rate of tuna,the gear structure and fishing performance,the hooks setting depths and the yield efficiency of a tuna longline were studied,based on the practical fishing operation investigation of a typica