Abstract
The most part (about 90%) of the yearly yield of Sardine off the coast of Ibaragi Prefecture is usualy caught by “Aguri-Ami” and its fishing-grounds are shown in Fig I. As we see from the figure, sea-water in these regions is effected by land water. And these regions consist in the “Siozakai” (Oceanographical boundary zone) which were formed by the “Kurosio” branch current, “Oyasio” and river currents.
So, I thought that the yield of fish largely depends upon the variation of water temperature and me_??_eorological conditions, and calculated the correlation coefficients between the yearly yield in the next year and the surface water temperature, rainfall or fog days in the present year of the sea-side observatories, and g_??_t the following table.
The expression of the yield on Ma_??_ch (of the next year) becomes Y=0.26A+0.23B+0.28C+0.23D, and on October (of the next year) becomes Y=0.20a+0.24b+0.19c+0.23d+0.14e.
By this method I got the following forecast: the yield of this year will be about 1, 900 millon “Kan” and _??_hat of the next year (1947) will be about 1, 600 millon “Kan”. (The average yearly yield is 2, 200 million “Kan”.)
