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The fundamental data on the catch fluctuation in the rectangular set net according to the tide age weredeveloped based on the catches recorded from the year 1986 to 2004 in the coastal waters of Hamdeok, Jeju.Total catch by the rectangular set net had a deep connection with the tide age. In particular, duringincreasing tide, total catch were reduced gradually from the neap tide to the high tide. As it turned out, theslope of total catch declined by degree and showed a correlation coefficient of determination of 0.76. On thecontrary, in the case of decreasing tide, there was little sign of rise in total catch. In particular, large catchseemed to occur at the next tide to the neap tide. In the relation between the catch and the tide age, the levelof the correlation coefficient chosen at p0.05 decreased in the order rabbitfish(0.84) and horsemackerel( 0.71), while the significance of other dominant species were not selected.Key words : Tide age, Neap tide, High tide, Catch fluctuation, Set net

Catch fluctuation of the rectangular set net according to the tide age in the coastal waters of Jeju