Aquacuùïe‘ of indiæñ major caÏrps
337
independently deVeloped in early'siXties*practically simultaneously'asÿin
China and USSR;
The practite‘of using
containers partly
su5pended in water to serve as nuptial chamber for injected brood fish (called
"Breeding hapas”) and of "hatdhing hapas" for batching fertilized eggs has, in
recent
years, been
several versions of which exist,
some
indoor and others Outdoor with circular cemented
portable ones of low density pOlyethylene
2.
PREPARATION AND MANAGEI‘ŒN—T OF NURSERY FONDS
.
'
s,
:
A nursery pond ideally is
2) of 0.01 to
in area,
3) of 0.5 to
m.in
shape with convenient width
for facilitating netting and 5) provided with a sump at outlet for collection
of fry.
'
Basically, in the preparation and management of nursery pODÔSprOViSiOH
is made to remove factors whiCh are known to càwsé mortality and m@rbidity‘of
carp post—larvae so as to assure high survival and healthy.groWth; These fac—
tors are
(Alikunhi, 1952) & l) physico—chemical environmental incompatibility
the transplanted
paucity of adequate amount of requisite
"'kind of foôd'for the ydug“fishÿ 3)
ànd frogs that abound in all bodies
of
minnowS and other unwanted_ishïWhi@h
are usually present”in
among
_particulàrlÿ those
whéh ate
%) Sudden…
rise in
pond$
depth; 8) overgr0Wth
of phYtoplàhktôn
of
thereof during nights; and 9) profusion andïprôliferation of
and benthic algae often associated with paucity of plankton in water. To these
may'bè added
toxicitÿ of certain algae
tions
mortality âhd ‘?12‘)
and illfhea1th
arisihg out
in
nitrogen;
application of organic manures and inorganic
of predatory insects and
Soil nitrogen enrichement is
done by growing a
crop on pond bottom, & process
called
"green manuring"
mcorporatmgplant1700t€—lnt0th€8011b3’P10‘lc‘ähmg
Toxicants used to eradicate unwanted fish are 4-20 mg/l of derriS
value
Commonly“ Call
011 cake1n Ind1a, 2)
/tl”
as
of Croton
4) 20 mg/l of powdered seed of Barringt0nia ÊÉEËËÊEËEÈË£ 5) 12 mg/l of powde“"*“*”‘fed
fru1tofRand1a dumetorum
…
manure, lt S dosage
‘WhëÏt'H‘?—f‘
Ï“"°f
ments. Ptedatofÿ
eradicated_IZ—24 hours
one of thé folÏôwing“freatnents”ç l)
Of 56 kg muStard or
‘
synthe—
Ca_loEhylÆ
(Y—hexachlrocyclohexane)3 )001 Ing/l of pure gamma isomer efb enzenehexa—
chloride
iè‘ëd‘lv ed1nethyl äÏÏÜÔHO IE ,4 )*‘ï
g‘h‘:
‘àOÏ‘ZIËL ; :
(1 1), the emulsifier Hyoxide (0.75 ml) and water (40 ml) at the rate Of
337
independently deVeloped in early'siXties*practically simultaneously'asÿin
China and USSR;
The practite‘of using
containers partly
su5pended in water to serve as nuptial chamber for injected brood fish (called
"Breeding hapas”) and of "hatdhing hapas" for batching fertilized eggs has, in
recent
years, been
several versions of which exist,
some
indoor and others Outdoor with circular cemented
portable ones of low density pOlyethylene
2.
PREPARATION AND MANAGEI‘ŒN—T OF NURSERY FONDS
.
'
s,
:
A nursery pond ideally is
2) of 0.01 to
in area,
3) of 0.5 to
m.in
shape with convenient width
for facilitating netting and 5) provided with a sump at outlet for collection
of fry.
'
Basically, in the preparation and management of nursery pODÔSprOViSiOH
is made to remove factors whiCh are known to càwsé mortality and m@rbidity‘of
carp post—larvae so as to assure high survival and healthy.groWth; These fac—
tors are
(Alikunhi, 1952) & l) physico—chemical environmental incompatibility
the transplanted
paucity of adequate amount of requisite
"'kind of foôd'for the ydug“fishÿ 3)
ànd frogs that abound in all bodies
of
minnowS and other unwanted_ishïWhi@h
are usually present”in
among
_particulàrlÿ those
whéh ate
%) Sudden…
rise in
pond$
depth; 8) overgr0Wth
of phYtoplàhktôn
of
thereof during nights; and 9) profusion andïprôliferation of
and benthic algae often associated with paucity of plankton in water. To these
may'bè added
toxicitÿ of certain algae
tions
mortality âhd ‘?12‘)
and illfhea1th
arisihg out
in
nitrogen;
application of organic manures and inorganic
of predatory insects and
Soil nitrogen enrichement is
done by growing a
crop on pond bottom, & process
called
"green manuring"
mcorporatmgplant1700t€—lnt0th€8011b3’P10‘lc‘ähmg
Toxicants used to eradicate unwanted fish are 4-20 mg/l of derriS
value
Commonly“ Call
011 cake1n Ind1a, 2)
/tl”
as
of Croton
4) 20 mg/l of powdered seed of Barringt0nia ÊÉEËËÊEËEÈË£ 5) 12 mg/l of powde“"*“*”‘fed
fru1tofRand1a dumetorum
…
manure, lt S dosage
‘WhëÏt'H‘?—f‘
Ï“"°f
ments. Ptedatofÿ
eradicated_IZ—24 hours
one of thé folÏôwing“freatnents”ç l)
Of 56 kg muStard or
‘
synthe—
Ca_loEhylÆ
(Y—hexachlrocyclohexane)3 )001 Ing/l of pure gamma isomer efb enzenehexa—
chloride
iè‘ëd‘lv ed1nethyl äÏÏÜÔHO IE ,4 )*‘ï
g‘h‘:
‘àOÏ‘ZIËL ; :
(1 1), the emulsifier Hyoxide (0.75 ml) and water (40 ml) at the rate Of