Establish the useing by-catch organisms to measure environment of fishing ground in the Bay

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In general, by-catch occurs in almost fisheries. On the other hand, fisherman who don't have tool of environmental measurement, they estimate environment of under water from by-catch organisms. In this study, I tried to derive relation between environment and by-catch organisms from field experiment.The results of field experiment show that each species have temperature zone in which is high-frequency. These species prove to be of much help to fisherman estimating under water environment.