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pp.199-206
As the basic study about improvement of yellow croaker drift gill net fishing implement and development of the fishing system, this study drew problem after synthetically analyzing hauling system of yellow croaker drift gill net used in the coast of Chuja Island and tested several characters and analyzed in hauling process with 5 step net hauler model for improving the problem. The analysis results are as follows. When the angle between axises of drum centers was small, it showed the tendency that hauling time was fast. Hauling time was faster when drum was 5 step rather than 3 step. When drum was 5 step, slippery phenomenon was small and hauling was stable. Tension was larger when drum was 5 step rather than 3 step. When drum was 5 step, the range of change of the maximum and minimum value was small and hauling was stable. When drum was 3 step, there was following formula between hauling time (Ht3) and angle between axises of drum centers (Ag) Ht3 : (7.15Hs-0.81) Ag-0.81, when drum was 5 step there was following formula.Ht5 : (6.45Hs-0.75) Ag0.10, here, Hs is hauling speed. When drum was 3 step and hauling speed was 28cm/sec, tension was T=0.08A83-1.60Ag3-0.49Ag+369.56(r=0.99), when drum was 5 step, tension was, T=-0.01Ag3+1.96Ag2-34.05Ag+414.58 (r-0.99), here, T was tension(g).
