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).
Another important finding is that
fishing activities occurred across a
wide area, and continued throughout the year in at least one area of the Sea of Japan.
This indicates that squid resources in the Sea of Japan
are very important not only as human food but also for
their role in the energy and material flows in marine
ecosystems. Although the trophic interrelationships
between Todarodes pacificus and other species are not
fully understood, the squid fishery in Japan may also
impact associated species