340
»»V-@…J4ÜIΔŒâU…_… … ,.
collected in a sump from where.it was pumped through a biological
recirculated through.thè cemented
frÿ of catla
and.rohu (45 mm long) recorded a high survival of
and 97 % and a
to
about 90 mm.and 117 mm respectiVely in 32 daÿs° The fry were fed
}
bled commercial feed pellets containing 30 % protein registering a
ratio of
1.6 in catla and 1.1 in rohu. The stocking rate adopted in_the sys—
tem was
25 % higher than in the conventional rearing pOnds of 125
system has overwhelming adVantage as it not onlÿ helps in rearing
numbers With a high survival in a much smaller space but also Cuts
mendously on the rearing period. The system promises 3 crops of
in_a breeding season (Jhingran et al., 1979).
_
‘
'
'
‘
.
‘.
x
’
.
_
'
.
4., PREPARATION AND MANAGEMENT oF
_
‘
[
A stock pond ideally is: 1) drainable, 2) 0.2 to 2.0 ha in area,
to
2.5 m,in depth (greater depth preferable in cold climatic zones and
areas
where the rate of evaporàtion is high); 4) of rectàngular shape
convenient Width of 20 to 30 m for facilitating netting. A convenient
of water for stock ponds is a well (artiSan, open or tube) or an
Preparation of stock ponds before
clearing the
its excessive micro—. and.
Predatory
wanted_ish and
and
organic and
ganic
stockfpond operations cover
The methods that are adopted for all these operations are the very same
have already been described under nursery and rearing pend
and perennial
need to be desilted before
Chemical
fî$ ànd .Biota aïe… n0t
easily.and Pt11ypplbl nhwtbapuy wh
mors
. — they are
communlty 920PPtrîÿ, ,,Si,dÏe.
'
vèil'1‘ag‘ e 't.an1<‘a used
-
for…schPlYin -ÈWëætêrfor
dunk
Ph
n mthdf fftv pfman fth ptn içn h
watbd1fapultn
'
,
Wh11etradt1nauy Plyulturf fu1ndan ma3arp pe h
been done in West Bengal,
from ancient ti…éë and
3:3:4 or 3:6:1 oi catla, rohu and mrigal or 3:5:l:1 or catla, rohu,
(Nara.
and P1113Y 1962)lËW38 only afterl96 lthat eXperments,many last1ng for
one year durat1°nandbeyond onpolycultureaflm… magor carps alone
=
Polyculture of Chmese car PS alone and Polycultur e (compo site culture)of
“
‘Êd
e
in
.,
h1ngran,1975) TheseeXPerJ—ments froml962unt 11nowhavebeendonebythe
‘
DlVlswn ltSallïï‘“aCom—"dln«'sle<îresearchpr03ecton compos1te f. ish cultu‘—’e
‘
'
andseedPr0duCŸ—l°n’lt$CPP—l'atl
…
Bdè f on
°°“°ur,r ent_ly b,Y …ê11
West Bengal:Ïndla
…
,
…
w
…
w
\
M…
'\,
m
\
,
\\
__
\
»»V-@…J4ÜIΔŒâU…_… … ,.
collected in a sump from where.it was pumped through a biological
recirculated through.thè cemented
frÿ of catla
and.rohu (45 mm long) recorded a high survival of
and 97 % and a
to
about 90 mm.and 117 mm respectiVely in 32 daÿs° The fry were fed
}
bled commercial feed pellets containing 30 % protein registering a
ratio of
1.6 in catla and 1.1 in rohu. The stocking rate adopted in_the sys—
tem was
25 % higher than in the conventional rearing pOnds of 125
system has overwhelming adVantage as it not onlÿ helps in rearing
numbers With a high survival in a much smaller space but also Cuts
mendously on the rearing period. The system promises 3 crops of
in_a breeding season (Jhingran et al., 1979).
_
‘
'
'
‘
.
‘.
x
’
.
_
'
.
4., PREPARATION AND MANAGEMENT oF
_
‘
[
A stock pond ideally is: 1) drainable, 2) 0.2 to 2.0 ha in area,
to
2.5 m,in depth (greater depth preferable in cold climatic zones and
areas
where the rate of evaporàtion is high); 4) of rectàngular shape
convenient Width of 20 to 30 m for facilitating netting. A convenient
of water for stock ponds is a well (artiSan, open or tube) or an
Preparation of stock ponds before
clearing the
its excessive micro—. and.
Predatory
wanted_ish and
and
organic and
ganic
stockfpond operations cover
The methods that are adopted for all these operations are the very same
have already been described under nursery and rearing pend
and perennial
need to be desilted before
Chemical
fî$ ànd .Biota aïe… n0t
easily.and Pt11ypplbl nhwtbapuy wh
mors
. — they are
communlty 920PPtrîÿ, ,,Si,dÏe.
'
vèil'1‘ag‘ e 't.an1<‘a used
-
for…schPlYin -ÈWëætêrfor
dunk
Ph
n mthdf fftv pfman fth ptn içn h
watbd1fapultn
'
,
Wh11etradt1nauy Plyulturf fu1ndan ma3arp pe h
been done in West Bengal,
from ancient ti…éë and
3:3:4 or 3:6:1 oi catla, rohu and mrigal or 3:5:l:1 or catla, rohu,
(Nara.
and P1113Y 1962)lËW38 only afterl96 lthat eXperments,many last1ng for
one year durat1°nandbeyond onpolycultureaflm… magor carps alone
=
Polyculture of Chmese car PS alone and Polycultur e (compo site culture)of
“
‘Êd
e
in
.,
h1ngran,1975) TheseeXPerJ—ments froml962unt 11nowhavebeendonebythe
‘
DlVlswn ltSallïï‘“aCom—"dln«'sle<îresearchpr03ecton compos1te f. ish cultu‘—’e
‘
'
andseedPr0duCŸ—l°n’lt$CPP—l'atl
…
Bdè f on
°°“°ur,r ent_ly b,Y …ê11
West Bengal:Ïndla
…
,
…
w
…
w
\
M…
'\,
m
\
,
\\
__
\