This fish belongs to the group of quick and strong swimmers in pelagic
zones of seas and oceans. Its streamlined body, thin, carrying powerful
fin, caudal stalk with two keels and additional fins behind the dorsal
and anal fins, and well-developed musculature allow the mackerel to develop
high speed to maintain it for a long time. During migrations, the Japanese
mackerel covers from 25 to 30 km in one day. It lives preferentially in
subtropical waters, but every year when the water warms up in summer it
appears in large numbers in Peter the Great by in fall to rapidly depart
to the south.
The mackerel is maximally 60 cm long
at weight of 1.5 kg. In the waters of Peter the Great Bay, the mackerel
spawns only when its population is high in warm years from June to August.
Spawns roe at water temperatures ranging from +12 to +20oC,
usually in the evening and at nighttime. Fertility fluctuates from 350
thousand to 2.5 million roes. Fertilized roe would float to the surface.
The mackerel is a major commercial species, and judging by its bones found
in numerous shell heaps, it was also successfully landed in Primorye in
the remote past.