Map of Matsushima Bay, Miyagi Pref., Japan
141。10´
10´E
ho
riz
at
io
n
MangokuMangoku-Ura
ra
ut
Matsushima
Bay
Ishinomaki
38。
20´
20´N
ut
ho
Shiogama
ou
ta
Sendai Bay
Tona
Canal
se
m
in
at
Takagi
River
e
w
ith
Sendai
Matsushima
Bay
o
no
td
is
Matsushima
D
Shiogama
Shiogama
Harbor
Onagawa Bay
0
1
2 km
141。10´
10´E
Onagawa
Bay
ho
ra
ut
ho
riz
at
io
n
MangokuMangoku-Ura
Ishinomaki
ith
ou
ta
ut
Matsushima
Bay
is
se
m
in
at
e
w
Shiogama
D
o
no
td
Sendai
Sendai Bay
38。20´
20´N
Takagi
River
ho
riz
at
io
n
Tona Canal
ho
ra
ut
Matsushima
in
at
e
w
ith
ou
ta
ut
Matsushima
Bay
no
o
D
Shiogama
Harbor
td
is
se
m
Shiogama
0
1
2km
o
D
in
at
se
m
is
td
no
e
ra
ut
ho
ut
ta
ou
ith
w
ho
riz
at
io
n
Effects of Artificial Eutrophication on Oyster Metabolism
Synthesis of fats in
the epithelia of the
digestive
diverticula and
intestine
ra
ut
ho
riz
at
io
n
:: Phenomena
Phenomena caused
caused
by
the
overmaturation
over
by the overof
over-maturation of
gonad
gonad
Ⅰ
o
D
Storage
of
neutral
fats in I
& C
w
ith
ou
ta
ut
Change in
respirator
y
substrate:
Increase
in energy
dependence
on fats
in
at
se
m
is
Mobilization of
stored fats in I
&C to eggs and the
epithelia of
digestive
diverticula
and intestine
Ⅱ
no
Stimulation
of the
steroid
metabolism
in E
e
Decrease in
stored
glycogen in
I & C
td
Storage
of
glycogen
in I & C
Disturbance
of the lipid
metabolism
ho
Activation
of the GG-6-P
DH system in
E
Decline
in the
physiolo
gigi-cal
activity
Extreme
decline in
the
physiologic
al activity
Disturbance
of the
steroid
metabolism
Ⅲ
Death
Ⅳ
ra
ut
Storage
of
glycogen
in I & C
at
io
n
Activation of
the G-6-P DH
system in E
ho
riz
G-6-P DH: glucoseglucose6-phosphate
dehydrogenase
Synthesis of
fats in the
epithelia of
the digestive
diverticula and
intestine
se
m
D
o
Ⅰ
no
td
is
Storage of
neutral fats
in I & C
in
at
e
w
ith
ou
ta
ut
ho
Decrease in
stored glycogen
in I & C
Stimulation of the
steroid metabolism
in E
Mobilization of
stored fats in I & C
to eggs and the
epithelia of
digestive diverticula
Ⅱintestine
and
After Spawning
or Before Sexual
Maturation
During Sexual
Maturation
at
io
n
ra
ut
Storage
of
glycogen
in I & C
Activation of
the G-6-P DH
system in E
Synthesis of
fats in the
epithelia of
the digestive
diverticula and
intestine
ho
riz
I & C: gonad interstitial
tissue and connective
tissues around the
digestive diverticula and
intestine
se
m
D
o
Ⅰ
no
td
is
Storage of
neutral fats
in I & C
in
at
e
w
ith
ou
ta
ut
ho
Decrease in
stored glycogen
in I & C
Stimulation of the
steroid metabolism
in E
Mobilization of
stored fats in I & C
to eggs and the
epithelia of
digestive diverticula
Ⅱintestine
and
After Spawning
or Before Sexual
Maturation
During Sexual
Maturation
ra
ut
Storage
of
glycogen
in I & C
at
io
n
Activation of
the G-6-P DH
system in E
Synthesis of
fats in the
epithelia of
the digestive
diverticula and
intestine
ho
riz
E: epithelia of
nephridium,
nephridium, digestive
diverticula and
intestine
se
m
D
o
Ⅰ
no
td
is
Storage of
neutral fats
in I & C
in
at
e
w
ith
ou
ta
ut
ho
Decrease in
stored glycogen
in I & C
Stimulation of the
steroid metabolism
in E
Mobilization of
stored fats in I & C
to eggs and the
epithelia of
digestive diverticula
Ⅱintestine
and
After Spawning
or Before Sexual
Maturation
During Sexual
Maturation
::Phenomena
Phenomena
caused
caused by
by the
the
over--maturation
over
overover
maturation
of
of gonad
gonad
Extreme decline
in the
physiological
activity
ou
ta
ut
ho
ra
ut
ho
riz
Change in
respiratory
substrate:
Increase in energy
dependence on fats
at
io
n
Disturbance
of the
lipid
metabolism
ith
Disturbance
of the
steroid
metabolism
w
Death
td
is
se
m
in
at
e
Decline in the
physiological
activity
Ⅳ
Immediately Before
Spawning
During Spawning
Period
D
o
no
Ⅲ