Life Cycle
Within this year of life, the squid mature from their larval form, feed and grow, migrate, and at the end of their lives, congregate at the mating grounds, where they reproduce. Three subpopulations have been identified in Japanese waters. “The main group spawns in winter in the East China Sea, the second in autumn, west of Kyushu, and the third, minor group in spring/summer in the Sea of Japan as well as off northeastern Japan.”
"Their migration moves north, then south, tending to follow the surface currents. The squid tend to travel in large schools of more or less uniform size that it is often possible to follow the growth of cohorts from recruitment to spawning, although the earliest part of the life history is generally more difficult to study because the larvae are always pelagic and some are rarely caught".
Squid generally only live one year because as soon as they reproduce, they die. Males mature first, and “transfer their spermatophores on the still immature females.” Then, on the continuing journey south, the females “mature and spawn 300 to 4,000 small, elliptical or semi-spherical eggs.” The squid migrate together, and lay all their eggs in the same area where they were born. The eggs hatch into larvae after only 102–113 hours (somewhere around five days), depending on the water temperature.
Read more about this topic: Japanese Flying Squid
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