Surface Swarming of Euphausiids — Komaki 
443 
CO 
QC 
100 
200 
Fig. 8. Water temperature 10 miles off Tsubakishima. 
fall 1954; (b), fall 1954 to fall 1955. 
mackerel was fished, abnormally conspicuous 
swarming of euphausiids was observed in this 
area (Fig. 7). Rapid decrease in mackerel 
yield occurring in 1952 and thereafter may be 
related to the disappearance of the spring 
swarms of euphausiids from the coastal area 
after that year. 
Location shown in Figure la. ( a ), Fall 1953 to 
Table 3 shows the change in annual yield 
of sand eel, Ammodytes personatus, from the 
Kinkazan waters. In general, the fishing season 
of sand eel in this area starts in January and 
terminates by the end of July, and they are 
taken from almost the same area as the 
euphausiid fishing ground shown in Figure lb. 
