There are two spawning groups: the spring spawnsrs and the fall 
spawners. The spring herring, the catch of which is larger, appear in 
the Sea of Japan from about mid-March to mid-April in the waters of Akita 
and Aomori Prefectures and those of southwestern Hokkaido, then proceed 
northward as the waters warn. In May spring herring are caught off the 
east coast of Hokkaido and in Karafuto and Sakhalin waters. After three 
waves of spawning, spring herring come in less developed schools on 
feeding migrations. Winter herring are taken mainly in Pacific waters. 
As Table 12 shows the herring catch declined markedly from 1934 through 
1933, the 1938 catch being about one-sixth of the 1934 catch. However, 
this was a temporary decline reflecting the cycle of abundance typical 
of herring; the larger catches of 1939 and 1940 indicate this. 
Cod (tara), Including the Alaskan pollack which is fished in the 
same waters, in most years is caught in quantities about as large as 
herring although the catch is less valuable than that of salmon. Cod 
fisheries have their southern limit on the Pacific coast at 38° and in 
the Japan Sea, where waters are colder farther south than along the Kuroshie— 
warmed Pacific coast, at about 35°. Cod are important in the northern 
prefectures of Honshu, all around Ho idea i do, in waters of the Kuriles and 
Karafuto. The west coast of Karafuto has more extensive cod fisheries 
than the east coast. In the Hus si an waters cod fishing and salmon fish¬ 
ing grounds coincide in general, i.e. along both the east and west sic*e 
of Kamchatka, along the Siberian coast in the vicinity of the town of 
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16-031 P54 bu 
