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5mm
lateral
ventral
dorsal
Descriptive notes:
< %Ë ;/f;âïä;gt.
Adults attain about 70cm in body length.
<
Body compressed.
Scales comparativelÿ small.
_
Color of dorsal surface slightly dark-blue and sides of body.
;_:;Ç;: <
light.
No spots on dorsal surface and sides.
in the season of breeding, the head of male fish is
transformed, especially the upper jaw iuts out and bends
downward.
Do not swim in massed schools, but swim in loose shoals
=
near the surface of waters.
Eat small marine animals located by means of sight and
olfactory sense.
Extent of migration very wide.
Swimming movement quick.
Fish of this kind hatch in rivers, and mature in the seas.
Swim up rivers in the breeding season and spawn.
Found in the northern part of Japan, especially in the north
Pacific.
Caught by gill-nets and fixed nets in the seas.
Bulbus olfactorius compressed and well-developed, closely
attached to comparatively large lobus olfactorius.
Lobus opticus comparatively large.
Corpus cerebelli well-developed.
Emmentia granularis and crista cerebelli rather small.
.
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“‘“‘35Ë5ä‘a
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42—43