\\—4 \—\ËîBäfSUZUH_ ,:
îpoles driven into the bottom of the lake. The cage walls extend l m
to
keep the fish from jumpingwout… ln Lake Kasumigaura and
is
of Cage without floats and
which
May; yearlings weighing
g
;ked in each cage (around 70 fish/m2) ,they are fed a pelleted artificial
enrautomatic feeding machine several times a day and grow to a
giving a yield of 40—60 kg/m2 by the October.
the—grdwingSèàson*(July to
feeds containing
silkworm pupae are used to produce rapid growth and good table
mean
efficiency of feed conversion in a typical instance of net—cage
is
about
and the survival rate is about 94% (Table 2).
B — E£m_9î_i£r3gÿiOÆ—pond guitare
"
"
Since 1954, farm or irrigation ponds have been utilized
carp culture. In 1982, about 35% of cultured carp in Japan were produced
these systems. The ponds used for Such culture range from 0.5 to 20 ha
area.
Each pond is proVided with floating piers with
water
is
uSually left
except during
quantity and quality of:the water decrease and
be
pumped in. From April to May; yearlings
ponds at a density:of one fish par m2., and fed
time81a
From
and silkwarm pupae are used. The fish reach & mean weight of 1 kg by
of càrp from stocking to\harvesting in
foeed conversion
,
Thlsculture techn1queorl gin atedfromthemethodformerly usedt0
carp taken from rice fields. At present,
running—water ponds are
for intensive reafihg of_carpïonly in a few places where there
watersupp1y such as 1nthe GumaandNagano Prefectures In19828b0ut117
of the cultured carp in Japan were produced by
generally
small (20—100 m2), With water aïound l…5 m deep… The
pond is sloped so that it becomes shallower from inlet to outlet. Water
Supplied from a nearby river at an inflow rate varying
ponds are stocked in April with rather large
g (ôdëñsity of
theoxygen
content
of the infloWing water. Fish are generally fed with both
feed
àîfd
Several times
Bÿ autumnthef:iäShumèâCh‘ an
weight of 1 kg. The net production
by this system is
The efficiency of-feed conVersion in running—water
lower
(37—40%) than in either
of
away.
of a high produCtion per unit
hervesting is
=
“
‘
\
.
111 —
*‘"
r
'
-
…
…
\\\…\\\
\…
\\
\
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\\\‘\\
\
\
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\\\\\H\\\\\\
îpoles driven into the bottom of the lake. The cage walls extend l m
to
keep the fish from jumpingwout… ln Lake Kasumigaura and
is
of Cage without floats and
which
May; yearlings weighing
g
;ked in each cage (around 70 fish/m2) ,they are fed a pelleted artificial
enrautomatic feeding machine several times a day and grow to a
giving a yield of 40—60 kg/m2 by the October.
the—grdwingSèàson*(July to
feeds containing
silkworm pupae are used to produce rapid growth and good table
mean
efficiency of feed conversion in a typical instance of net—cage
is
about
and the survival rate is about 94% (Table 2).
B — E£m_9î_i£r3gÿiOÆ—pond guitare
"
"
Since 1954, farm or irrigation ponds have been utilized
carp culture. In 1982, about 35% of cultured carp in Japan were produced
these systems. The ponds used for Such culture range from 0.5 to 20 ha
area.
Each pond is proVided with floating piers with
water
is
uSually left
except during
quantity and quality of:the water decrease and
be
pumped in. From April to May; yearlings
ponds at a density:of one fish par m2., and fed
time81a
From
and silkwarm pupae are used. The fish reach & mean weight of 1 kg by
of càrp from stocking to\harvesting in
foeed conversion
,
Thlsculture techn1queorl gin atedfromthemethodformerly usedt0
carp taken from rice fields. At present,
running—water ponds are
for intensive reafihg of_carpïonly in a few places where there
watersupp1y such as 1nthe GumaandNagano Prefectures In19828b0ut117
of the cultured carp in Japan were produced by
generally
small (20—100 m2), With water aïound l…5 m deep… The
pond is sloped so that it becomes shallower from inlet to outlet. Water
Supplied from a nearby river at an inflow rate varying
ponds are stocked in April with rather large
g (ôdëñsity of
theoxygen
content
of the infloWing water. Fish are generally fed with both
feed
àîfd
Several times
Bÿ autumnthef:iäShumèâCh‘ an
weight of 1 kg. The net production
by this system is
The efficiency of-feed conVersion in running—water
lower
(37—40%) than in either
of
away.
of a high produCtion per unit
hervesting is
=
“
‘
\
.
111 —
*‘"
r
'
-
…
…
\\\…\\\
\…
\\
\
\\
“\
\\\‘\\
\
\
\\
\
\'\
\
\
\\\\\H\\\\\\