Development of Technologies for Prevention of Damage Caused by Jellyfish in Set-Net Using Fish Behavior Analysis Based on Chaos and Fractal

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We have developed a comprehensive research about combined fisheries and systems science building up the set net fishing system to prevent jellyfish damages. The chaos and fractal theories have been applied to the fish's complex behavior in which the optimal mesh size will be decided to pass jellyfish but to catch fish. We have succeed at development of image processing system and chaos-fractal characteristics for analysis of its behaviors through the many experiments with the various mesh sizes of net. And, we establish a method to decide the optimal net using computer simulation.