北海道鰊資源の研究
(第1報)明治3年以降の漁具當り漁獲高
1948 年 14 巻 2 号 p. 73-76
詳細
1948 年 14 巻 2 号 p. 73-76
Calculating the catch per one net from the yearly amount of the herring catch in Hokkaido, we find that the former is inversely proportional to the number of the nets and that there seems to be shorter periods of 3_??_4 years, 6_??_7 years and 10_??_11 years and longer periods (covering the shrter periods) of more than 30 years in the fluctnation of the yearly catch.
