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Culture of Indian Major Carp

Culture of Indian Major Carp

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Culture of Indian Major Carp

Culture of Indian Major Carp

Broodstock maintenance
A proper selection of brood fish is one of the most important aspects to obtain greater results in breeding and grow out. In general, farmers select the fast growing and largest fish on the assumption that these characteristics will be inherited by the progeny. However, it is not recommended to choose their offspring or same stock, as this results in inbreeding and poor growth rate and a significant number of deformed fry. To the extent possible, the brood fish should be selected from the different sources.

A minimum of three months before the breeding season the male and female fish has to be
separated from the regular culture tank to avoid the unwanted breeding. During segregation, it is
important to avoid stress while netting. Male and females can be identified through secondary
sexual morphological characteristics, which develop during the season of reproduction. In males,
the milt runs freely when abdomen is gently pressed and the females have a swollen abdomen due
to the development of ovaries. The fishes have to be maintained with sufficient space and need to be
fed with a protein-rich feed which improves the gonadal development and also produces high
quality eggs.

Spawning of Indian Major Carps
Hypophysation refers to the breeding of fish with pituitary gland extract. Brazilians developed this technique. In India, H.L.Chaudhary and K.H.Alikunhi pioneered the use of this technology for Indian major carps. Induced breeding means to induce fish to release gametes through the application of pituitary extract or hormones or chemicals. Induced spawning is conducted during the onset of the southwest monsoon season (June) where there is an accumulation of rainwater in ponds and also a small reduction in temperature. The common carp pituitary is considered for better results, but in most cases same species gland and Human Chorionic Gonadotropin (HGC) are used. The administered dose of pituitary gland depends on the maturity stage of fish, and environmental condition (rain and temperature).

A primary dose of 1 – 2mg/kg and second dose of 6 – 8 mg/kg body weight of fish after six hours is
administered. After injection, the brood fish has to be transferred into the breeding hapa following
the ratio of two male for every one female. The breeding hapa is a box-shaped enclosure made
using cloth. About 50,000 to 1,00,000 eggs are hatched in hapa of size 2 x 1 x 1 m. Facility to open
and close the upper flap is also made available. The corners of the cloth in all sides are tied to poles
to keep them intact. The bottom should not touch the ground. Water temperature is to be maintained
at 26 – 31OC. Spawning occurs after 16 – 18 hrs and the hatchling fall into the outer hapa. The
breeding regularly takes place after 4 – 6 hrs of the second injection. Due to the riverine habit of
these fish, they spawn only once, unlike rohu and mrigal which have possibilities to spawn again
after one or two months.

Injection methods
· Intra-muscular injection is administered (pituitary or ovaprim or ovatide) into the muscle
on caudal peduncle in between the posterior end of the dorsal fin and above the lateral line. It is
commonly practiced and is the most effective and less risky method.
· Intra-peritoneal injection is administered into soft region of the body such as base of the
pelvic or pectoral fin. This method may harm the gonad or liver. Intracranial injection is given on
cranium. This method is very risky and damages the brain.

Carp seed rearing
Newly hatched larvae nourish themselves for 3 – 4 days, after which they depend on the
natural feed from the environment. Availability of natural feed is most critical during the phase
when it changes from the yolk sac nourishment to the commencement of natural feed, besides a
suitable ecology to obtain greater survival percentage. Adequate care is to be taken before initial
stocking.
The nursery pond is a pond where spawns are reared into fry. It takes 15 – 20 days with a lower
water depth of 1 m. Nursery pond size of 0.02 to 0.1 ha is usually suitable for small-scale
production and 0.5 ha for large-scale production. For fry rearing the seasonal ponds are preferred
than the perennial ponds. Also small ponds have greater scope in terms of effective utilization than
larger sized ponds.

Pre-stock pond preparation
The carps spawn need to have good environmental conditions and food availability. Prior
to release of the spawns, make sure there exist a congenial condition and adequate natural food
organisms, which enhance the survival rate. A well prepared pond environment provides an
optimum condition for a spawn. If its a drainable or seasonal pond, effective preparation include
draining, drying, ploughing, liming, filling with water and fertilizer application. For perennial or
undrainable ponds, besides the above mentioned steps, control of aquatic weeds and eradication of
predatory and weed fishes are also to be take care of.
Pond drying and ploughing facilitate the oxidation of organic matter, degassing of Hydrogen
sulphide and ammonia, kills the pathogenic microorganism, predatory and weed fishes and remove
the unwanted aquatic weeds. Ponds should be dried for a minimum of 7 – 10 days or until the cracks
develop on a clayey soil or until the stage when footprints do not form on a sandy soil.

The pond productivity depends on the soil quality of the pond, such as pH, water retention, texture,
total organic carbon, available nitrogen and available phosphorus. Liming helps to improve the
productivity by adjusting soil pH, mineralization of organic matter, release of soil bound
phosphorus to water and disinfection of pond bottom. Liming materials include agricultural lime
(CaCO ), dolomite (CaMg(CO ) ) and Calcium oxide or Quick lime (CaO). The quantity of 3 3 2
application varies with its effectiveness and soil pH. Generally, 200 – 500 kg/ha is applied to pond
soil. After application, the bottom of the pond should be ploughed well to mix it with the surface
soil. The quick lime is preferred for application to the soil during initial preparation and
agricultural lime is preferred for application after stocking the seeds. The optimum soil pH is is to
be maintained at 6.5 to 7.0.

Weed management
Poorly managed ponds are infested with emergent, floating, submerged, and marginal
weeds. It reduces phytoplankton production (due to nutrient competition and prevention of light
penetration), disturbs balanced oxygen availability (supersaturation in day and depletion in the
early morning), provides shelter to predator fish and insect, reduces the living space, increases
siltation, and obstructs netting and harvesting.

The aquatic weeds can be controlled by manual, mechanical, chemical and biological
methods. The selection of the method depends on the pond size, extent of weed infestation,
availability of time and money. Manual method is generally advocated for weed removal, because
it is easier, less time consuming and cost effective.
Physical methods of weed control include manual removal, usage of Winch, Cono- weeder,
Polythene shading, etc.Chemical methods of weed control include application of Anhydrous ammonia @ 20 ppm,Glyphosate @ 3 kg/ ha, 2 ,4 – D (2,4-Dichlorophenoxyacetic acid) @ 7 – 10kg/ ha, Simazine @ 0.3– 0.5 ppm, etc. .
Biological methods of weed control include usage of Plankton blooms, Floating Weeds, Macrophagus fish (grass carp, silver barb), Snails, etc

Eradication of predatory and weed fish
The presence of predatory and weed fishes in nursery affect the survival rate. These
fishes normally spawn prior to onset of carp spawning and increase their population. The larvae
of predatory may compete with carp seeds for food, space, oxygen, etc that affects the growth
and survival rate. Thus, eradication of weed fishes (murrel, catfishes, puntius, barbas danio and
anabas) is a prerequisite before stocking the carp seeds.
The dewatering and drying practices are best to remove the predatory and weed fishes.
However, if dewatering is not possible, eradication can be done through the application of a
pesticide. The selected pesticide should have characteristics such effective even on usage of low
dose, does not affect the quality of the fish, rapidly detoxifies and economical and readily
available. The physical methods of eradication include drying, usage of hook and lines and repeated
netting.Certain derivatives of plant origin such as Derris root power, Mahua oilcake, Tea seed cake can
be used.

Fertilizers
The successful fry rearing in ponds depends on the availability of zooplankton. For
sustained zooplankton production availability of phytoplankton and bacterial base are important
factors. Phytoplankton production requires adequate nitrogen and phosphorus. The nutrients can
be added by organic and inorganic methods.
The organic manures are rich in carbon and contain a small amount of nitrogen and
phosphorus. It promotes zooplankton growth by the saprophytic food chain. Cow dung and poultry
manure are organic manures that are usually used. They are applied before 15 days of seed stocking
at the rate of 5 – 6 tons/ha and 2 – 3 tons/ha respectively. The nitrogen and phosphorus are 2 – 3
times greater in poultry manure than cow dung manure. Hence half of the dose of cow dung is used
when poultry manure is applied.
The inorganic fertilizers used are Urea or Ammonium sulphate as a source of nitrogen and
Single or Triple phosphate as a source of phosphorus. When the applied dose exceeds the limit,
blue-green algae blooms. Thus, a mixed use of organic and inorganic fertilizer is recommended
(750 kg groundnut or mustard oil cake, 200 kg cow dung and 50 kg of single super phosphate per
hectare) for the sustained and rapid production of phytoplankton.

Stocking
Prior to the transfer of the spawns to the pond, stocking acclimation has to be done to prevent sudden water quality changes, which affect the survival rate. Early morning or late evening is recommended for stocking. It may be noted that there may be lower dissolved oxygen in the early morning in the ponds, if the ponds are newly fertilized ponds and have high plankton. Similarly, in the evenings the water temperature may be high in the ponds that could stress the spawns. These parameters have to be tested and taken care of before stocking to obtain higher survival. A stocking density of 3 – 5 million / ha or 300 to 500 per m2 is recommended for earthen ponds and 10 – 20 million /ha or 1000 to 2000 per m2 for cement cisterns.

Post-stocking
The availability of natural food is insufficient to rear the spawn in ponds due to higher
stocking density. The requirement of artificial feed is hence necessary. Artificial feed comprises of
groundnut oil cake and rice bran at 1:1 ratio. 6 kg/million/day of feed is required for the first 5 days.
For the remaining period, 12 kg/million/day is requried. The two feed ration is necessary to get
greater survival rate and enhanced growth rate. The prolonged rearing of spawn in the nursery pond
reduces the growth and survival rate. After 15 days, the spawn may reach about 25 cm, which is
suitable size for fingerlings rearing. Spawn can be harvested by using the gear with the mesh size of
1/8″. It’s measured with the perforated cup. Normally, 40 – 50 percent survival is achieved in wellpracticed ponds. 2 – 3 crops are possible in earthen ponds and 4 – 5 crops are possible in cement
cisterns. Monoculture is practiced for spawn rearing in ponds.

Rearing of fry to fingerlings
The ponds for the rearing of fingerlings also require all pond preparation practices like
those followed for nursery ponds, except the insect control practices. Cow dung @ 3 – 4 tons/ha and
single super phosphate @ 30 – 40kg/ ha are to be added in the fingerling rearing pond 10 days prior
to stocking. In addition to this, after stocking, 500kg/ha cow dung and 10 kg/ha of single super phosphate are added two times in a month. Please note that only half the amount of Cow dung is to
be added when poultry manure is applied.
Polyculture is practiced in the rearing of fingerlings based on feeding niche distribution.
Commercially important species also can be reared along with carps. When the seeds are
transported from longer distances, there is need for proper acclimation. The stocking size for about
25 mm size (15 days old fry) is a density of 0.1 – 0.3 million/ ha without aeration and 0.5 – 0.6
million/ha with aeration. For polyculture, the preferred ratio is 1:1:1 or 1:2:2 or 3:4:3 of Catla:Rohu: Mrigal.
Carp fry are planktophagic with preference to zooplankton. The stock has to be fed with
supplementary food. Rice bran or wheat brawn mixed with groundnut oil cake / mustard oilcake /
cotton seed oilcake in 1:1 ratio may be used for nutrition. To achieve greater growth, extra
ingredients such soya flour, fishmeal vitamins, mineral mixture can also be included. During the
first month, the preferred feeding quantity is about 8 – 10 percent of the body weight of biomass and
during second and third month 6 – 8 percent of body weight is sufficient. A minimum of two-time
feeding or two rations per day is desired.

Harvesting
Harvesting of fingerlings is done when it reaches about 80 – 100 mm length which
generally takes around 2 – 3 months. Rearing of fingerlings duration can be extended when
advanced size fingerlings are required. If the fingerlings are needed to be transported, the feeding
should be stopped one or two days before harvest to improve conditioning. A minimum of 60 – 70
percent of survival is attained if best practices are adopted.

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