It is of note
that some fishing areas occurred at
similar times but at great distances
apart. For instance, Classes 1 and 3
(Figs. 9 & 10) ranged from the
northern waters of the east coast of
Korea to the west of Tsugaru Strait
and the Yamato Rise and occurred
in August and September. This
indicates that squid in these regions
could be at a similar phase of the
life cycle, since portions of the
autumn or winter spawning groups
follow the TWC branches that flow
off eastern Korea and the Japanese
coast.
The different spatial and temporal
patterns of each class suggest
squid movement or migration. Our
results show northern and southern
migration patterns. One of the
northern migration patterns was
along Honshu Island to northern
areas of the Sea of Japan, another
ran along Korea’s east coast northward
through the Yamato Rise to
northern areas of the Sea of Japan.
The southern migration pattern was
a reversal of the northern migration
pattern (Fig. 11).