.
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Carangidae
Trachums japenæus
& emn …
.
…
_.
Japanese Jack mackerel
MAAJl
________________________
_______…_……__,_…-...…
N.olf.
-……………………_Ô
bulb.olf.
……____g
_
lob.olf.
_
……______9
_
.f—
……____0
'
iob.inf.
ch.opt.
_
‘
ch.opt.
___—6
x
Â.
hypos.
hy pos.
—
.
tect.
—©
lob.inf.
‘
—
'
'
.
_
.
sac.vas.
._
_,
-
N.3.
0
—
C.Cbl.
C.Cbl
N.8.
emin.gran.
vent.q.
'
N9+10
med_ob_
crlSt'Cbl'
___—©
—
'
.“
.
"
cbl
-
med.ob.
___—___.qg
_
med.sp.
med.sp.
—————-—Œi
..j.‘—Ï
"__Œ
|___—ï
lateral
ventre]
dorsal
.
Descriptive notes:
Il\ëTâ“âîä*bütäûäïâfäëliäîäLît\%3.
Adults attain about 30 cm in body length.
?ËË®Ë=”ËÊ (îËÊ) iäiä)ÎîËb\
Body somewhat elongated and slightly compressed.
(;1xHë4) (àtbëÿ9‘g;( %Ël…
Posterior part of body Slendef('FË) HË -
Large cycloid scales present on sides of body.
'
J: <
Color of dorsal surface dark-blue, ventral surface,
Œ7“;,
%ËL'CV6,
silver—white.
'
Tail fin yellowish.
»
Live in schools in middle and lower waters of the seacoasts.
Have strong phototaxis.
Eat mainly small marineanimals located by means of
'
sight and auditory sense.
Fingerlings and juveniles are carried a great distance by
rivers, but the extent of migration of adult fish is narrow.
Swimming movement quick.
Found in the coastal waters extending from the central to
the south of Japan.
.
Caught by round haul nets and ripples.
-
'
Bulbus olfactorius small and closely adhered to
-'
comparatively large lobus olfactor-‘zus. Lobus inferior
-
expanded laterally.
Lobus opticus enormously large and
.
lateral sides invaginated.
-
Corpus ce'rebelli relatively well-developed.
Eminentia granularis and crista cerebelli egg-shaped and
well-developed.
116—117
_