太平洋岸主要3海域の大型定置網によるブリ成魚漁獲量の海域間相関

概要

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The annual catches of adult yellowtail Seriola quinqueradiata by large set nets in the three regions, Sagami Bay, Mie and KÔchi along the Pacific coast of Japan agree in long-term fluctuation, but do not agree in short-term fluctuation. In order to grasp this phenomenon, correlation coef-ficient in the voluntary periods more than 4 years between the catches have been investigated by the long-term catch records after 1899.The results are summarized as follows;1) There are no fixed relations of the catches between any two regions in the short-term cor-relation which change by age.2) Frequency of significant positive correlation coefficient increase with the increase of time scale of data. Ratio of the frequency arrives at 100% in the long-term correlation for more than 30 or 45 years. This result agrees with those of past researches.3) Significant negative correlation coefficients appear in the short-term correlation within about 10 years. But ratio of the frequency is very low and is almost negligible for more than 10 years correlation.4) Based on scatter diagram of the catches, long-term fluctuations of correlation between the catches are constructed with short-term fluctuation of the correlations which are shaped as blocks by centering nearby years.5) The correlation coefficients within each block are negative correlation. This result agrees with the fishermen's opinion.
日本水産學會の論文