S.NO. |
PARTICULARS |
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REMARKS |
Brood Fish Care
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i) |
STOCKING
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Brood fish should be raised and maintained with the stocking
rate of 400 to 500 kgs/acre. It is preferable to stock 400 kgs
fish/acre. Different species of fish should be kept in different
ponds. |
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Availability of quality brood stock has a pivotal role in the
successful operation of a hatchery. As such healthy stock should
be selected and greater attention be focused towards maintenance
of proper hydro-biological condition to ensure sustained growth.
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ii) |
FERTILIZATION
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Bed manuring of the brood stock ponds be carried out with
4000-5000 kgs per acre organic manure (cowdung) prior to water
filling and such ponds be periodically fertilized to maintain
productivity to desirable extent with 1000-1500 kgs organic
manure & 8 kgs Inorganic fertilizer per acre per fortnight,
subject to qualitative and quantitative fluctuations of plankton
level. |
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Preferably when the water temperature ranges between
25-32°C.
At the time of shifting of brood fish treatment with sodium
chloride or KMNO4 (Potassium permagnate) be given. |
iii) |
SUPPLEMENTARY FEEDING
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Supplementary feeding of brood stock should be done with Rice
polish, Maiz glutin and Mollasses in the ratio of 7:2:1 at the
rate of
2-3% body weight of stocked fish per day.
Note: Brood stock of grass carp be fed with green fodder
(Chatala, Barseen etc.) daily as per the requirement of fish. |
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II) |
BREEDING
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i) Selection of Brood Fish
Brood fish selected at the time of induced spawning should be
healthy and fully ripe.
ii) Sex Ratio
Male : Female
1 : 1
iii) Hormone Dosage (Ovaprim) |
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It is to ensure breeding without fail and improve efficiency in
breeding results. |
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Fish Species
i)
Ctenopharyngodon idella (Grass carp) |
Total dosage of
Female
0.6 – 0.7 ml/kg |
Total dosage of Male
0.1 to 0.2 ml/kg |
In case of proper maturity of brood stock preferred doze should
be 0 – 6 ml/kg for male & 0.1 ml/kg for female. Fertilization is
executed only through stripping after 10-12 hours of hormone
infection. |
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ii)
Aristichthys nobilis
(Big head)
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0.6 – 0.7 ml/kg |
0.1 to 0.2 ml/kg |
-do- |
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iii)
Hypophthalmichthys molitrix (Silver carp)
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0.6 – 0.7 ml/kg |
0.1 to 0.2 ml/kg |
-do- |
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iv)
Catla catla (Thaila)
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0.5 ml/kg |
0.1 ml/kg |
-do- |
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v)
Labeo rohita (Rohu)
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0.3 – 0.4 ml/kg |
0.1 ml/kg |
-do- |
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vi)
Cirrhina mrigala
(Mori)
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0.3 – 0.4 ml/kg |
0.1 ml/kg |
-do- |
III) |
POST BREEDING
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Incubation
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i) Circular tank
a) Quantity of eggs |
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8,00,000 to 10,00,000 lacs in a tank of 5 cft dia. |
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b) Water Supply
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The supply of water in circular tank be arranged between 22-25
litres per minute. |
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c) Screen
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Screen at the central exit pipe should be of preferably bolton
cloth or nylon cloth and the number of mesh be 4200 or slightly
above per sq. inch. |
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ii) Mc. Donald Jar
(Glass Jar)
a) Water Supply |
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Water supply to each Mc. Donald Jar should be regulated with 1-
1.5 litres per minute. |
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b) Quantity of eggs
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15000 – 2000 eggs / Jar |
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Nursing of Hatchling
Following is duration period for nursing of
hatchlings till these became first feeding larvae/fry. |
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Feeding of Yolk fry be avoided. |
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Hours
72 – 80
80 – 96 |
Water Temperature
27 – 28oC
25 – 27oC |
Fry is ready for
stocking when air bladder is formed and yolk sac is nearing
absorption.
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Preparation of Fry Ponds
i) The pond should be sun dried before the
breeding schedule is commenced. |
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To ensure dis-infection of pond soil. |
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ii) The pond should be
fertilized with organic manure (Cowdung) @ 4000 -–5000 kgs/acre
subject to qualitative & quantitative fluctuations of plankton
level.
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Dry manure is preferable. The fertilization should be executed
the day fertilized eggs are obtained. |
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iii) Fill the pond with
water to a depth of 1.5 feet 2.00 feet and maintain it.
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Addition of water should be managed just after the pond is
fertilized. |
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iv) Observe the
production of micro fauna after 48 hours of fertilization.
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At a temperature of 25 –32oC, after 48 hours of
fertilization, protozoans and Rotifers start appearing. After
72 hours the first food (protozoans and rotifers) are produced
fairly abundant. |
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v) Add insecticide, @ 0.5
– 1 ppm. In case dry pond is not available, netout the stock
from the fry receiving pond as far as possible, reduce the water
to minimum possible level. Assure extermination by Rotenon or
any other recommended insecticide @ 1ppm. Manure/ prepare the
pond as per doze referred in (ii & iii)) above. Add insecticide.
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Only insecticide mild toxicity, preferably of organophosphate
group be used. Check toxicity of the insecticide after 48 hours
of its addition prior to release of stock-survival of fry in a
sample of water collected from treated pond upto 4 hours will
give satisfactory results. |
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Stocking of Fry
i) Rate of Stocking
4,00,000 fry/acre
ii) At the
time of stocking of fry care, should be taken to ensure
acclimatization of fry with pond water temperature. |
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To avoid temperature stock to fry. |
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iii) Start raising water
level of pond by 2” to 3” per day till it reaches the depth of 3
feet after the stocking of fry.
iv) Start
feeding fry with artificial feed after
10 – 14 days of stocking of fry.
v) Feed
ingredients may rice polish + Maiz glutin (30%) in fin powdered
form) with the ratio of protein 8:1 respectively @ 5% of total
weight of fry/day.
vi) Start
fertilization of the pond with 1000 – 1500 kgs cowdung & 8 kg
inorganic fertilizer, subject to qualitative & quantitative
fluctuation of plankton level. |
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