31 8
Aquacultuæ of Cypnids
*
%
INTERACTION OF WATER4HARDNESS AND HEAVY METAL (ZINC) ON FOOD
AND GROWTH IN CîprinusŸ-carpio;
S. PALANICHAMV, D. MONI, S.
M.P. BALASUBRAMANIAN, P.G.‘ and Rezscach Dcpæämcmxï 05 Zoo£ogy, Pâ£ané 624602,
Tdm££ Nada, INDÏÀ.
_
In the present
the sûb—lethal level Of Zinc for a
important
carpio was 0.4 mg/l and toxic level was 2
LC50 value calculated by graphiCal repréèentation was 0.78 mg/l. This
value increased with inCreasing‘hardness. The LC5O values were 3:82,
12.32 mg/l when the hardness of water samples were 160, 384,576 and
respectivelyu When carp was feared“in‘a zinc—free médium the growth was
mg g.live fish/day; This was reduced to 1.34 mg g/day when reared in a
containing 0.4 mg/1 concentration of zinc, but'icreased to 3.69, 3;99
3.6 mg g/day when the hardness of water increased to 384, 576 and 768
resP9—C’CiVE1Y;
'
-
'
-
-1‘
USE OF ANHYDROUS AMMONIA As A FISH TOXICANT IN THE
ECOSYS—TEM. T.
BHU, S.D. TRIPÀTHI,-D.K. CHATTERJEE, S.JENA,-and’K.M. DAS;
cubtwœ Rez» mah amd T/zimÇng Ccvzüc (CIFRI) (I.C.A.R. )'P.O.
vm. Bhubdnuwær, 757002r(0…mh1N01A.
*
‘'
,
‘
*
’
Attempts to standardi2e the use of anhydrous ammonia as a fish toxicant
the pond ecosyStem depended on the pH and temperature of pond water.
qualities were responsible f0r loss of ammonia, differences in expected
observed ammonia concentrations, as Well as for changes in the rate of
cation and cost of
Order to clear a broad
and predatory fish, and other biota 2't0 5 mg/l of ui0hized ammonia
ted with a short duration of detoxification gave satisfact0ry results. Desi+
rable fish in distress could be netted out immediately after
while the others were dead
f0110wig dayn The rate
varied from 250‘tô more than 600 Kg and odst RS 2500 to RS 6000 (US‘$
lent to Rs
12 approx.) per hectare. Since anhydrous ammonia is a strong
repellant and
Was necessary to apply it thoroughIYj
including marginal
PONDS WITH 'ËOLYCULÎÙRAL "MANAGETŒNT.
FMhW%RW—Swchwme H
Pond frig9hj cu1ture1sçëétf Ormed'under
ïehviraæiientàI'f
os‘1: jf The
gr9Wing seasonm Hungary:
ff rom
ê-té‘ùäb er
"
Thé
td- bnddbawt tmptu th groweh ef the?“ mffh
.
dmg°nth€Wpe0f maëgslÿént”fï macroplenkton
“the md- ‘
dle°fJulyorthebegmmngofAugœ @ “if‘ expected 'ketif
on î‘fs‘
t/ha
.
°r
ié'jùèt the
ite}
energy neceSSarÿ for the optimal
were …stuîîiêë aî= différent…water…Ï_terÏñPeïatuî—îes.….Ît Wes“fo‘und that.whi1e the
”
enerày‘requîr‘emet of cerp‘
inereaèejof 10°C, the…
P?°-tæ°—i. requirement. icfèâseid‘f6niy?
the seecia
requirement
of
the common carp was higher at lOWer temperature. Our fish
culture technology was worked out based bn the above bbServation. A stockihg
Structure
_:
care
=
20—zsz,_ïbieheed e 5107gp 3—52, s……s g1enis
not
only to ensure the maximum yiëld but thé“cfèate a zdäîäñîîe_ëäëiation
…
‘
u
\
H
H
\
\
\
\
Aquacultuæ of Cypnids
*
%
INTERACTION OF WATER4HARDNESS AND HEAVY METAL (ZINC) ON FOOD
AND GROWTH IN CîprinusŸ-carpio;
S. PALANICHAMV, D. MONI, S.
M.P. BALASUBRAMANIAN, P.G.‘ and Rezscach Dcpæämcmxï 05 Zoo£ogy, Pâ£ané 624602,
Tdm££ Nada, INDÏÀ.
_
In the present
the sûb—lethal level Of Zinc for a
important
carpio was 0.4 mg/l and toxic level was 2
LC50 value calculated by graphiCal repréèentation was 0.78 mg/l. This
value increased with inCreasing‘hardness. The LC5O values were 3:82,
12.32 mg/l when the hardness of water samples were 160, 384,576 and
respectivelyu When carp was feared“in‘a zinc—free médium the growth was
mg g.live fish/day; This was reduced to 1.34 mg g/day when reared in a
containing 0.4 mg/1 concentration of zinc, but'icreased to 3.69, 3;99
3.6 mg g/day when the hardness of water increased to 384, 576 and 768
resP9—C’CiVE1Y;
'
-
'
-
-1‘
USE OF ANHYDROUS AMMONIA As A FISH TOXICANT IN THE
ECOSYS—TEM. T.
BHU, S.D. TRIPÀTHI,-D.K. CHATTERJEE, S.JENA,-and’K.M. DAS;
cubtwœ Rez» mah amd T/zimÇng Ccvzüc (CIFRI) (I.C.A.R. )'P.O.
vm. Bhubdnuwær, 757002r(0…mh1N01A.
*
‘'
,
‘
*
’
Attempts to standardi2e the use of anhydrous ammonia as a fish toxicant
the pond ecosyStem depended on the pH and temperature of pond water.
qualities were responsible f0r loss of ammonia, differences in expected
observed ammonia concentrations, as Well as for changes in the rate of
cation and cost of
Order to clear a broad
and predatory fish, and other biota 2't0 5 mg/l of ui0hized ammonia
ted with a short duration of detoxification gave satisfact0ry results. Desi+
rable fish in distress could be netted out immediately after
while the others were dead
f0110wig dayn The rate
varied from 250‘tô more than 600 Kg and odst RS 2500 to RS 6000 (US‘$
lent to Rs
12 approx.) per hectare. Since anhydrous ammonia is a strong
repellant and
Was necessary to apply it thoroughIYj
including marginal
PONDS WITH 'ËOLYCULÎÙRAL "MANAGETŒNT.
FMhW%RW—Swchwme H
Pond frig9hj cu1ture1sçëétf Ormed'under
ïehviraæiientàI'f
os‘1: jf The
gr9Wing seasonm Hungary:
ff rom
ê-té‘ùäb er
"
Thé
td- bnddbawt tmptu th groweh ef the?“ mffh
.
dmg°nth€Wpe0f maëgslÿént”fï macroplenkton
“the md- ‘
dle°fJulyorthebegmmngofAugœ @ “if‘ expected 'ketif
on î‘fs‘
t/ha
.
°r
ié'jùèt the
ite}
energy neceSSarÿ for the optimal
were …stuîîiêë aî= différent…water…Ï_terÏñPeïatuî—îes.….Ît Wes“fo‘und that.whi1e the
”
enerày‘requîr‘emet of cerp‘
inereaèejof 10°C, the…
P?°-tæ°—i. requirement. icfèâseid‘f6niy?
the seecia
requirement
of
the common carp was higher at lOWer temperature. Our fish
culture technology was worked out based bn the above bbServation. A stockihg
Structure
_:
care
=
20—zsz,_ïbieheed e 5107gp 3—52, s……s g1enis
not
only to ensure the maximum yiëld but thé“cfèate a zdäîäñîîe_ëäëiation
…
‘
u
\
H
H
\
\
\
\