Pre stocking management is one of the important method of entire three tire fish farming system. Because, fish mortality is very high at the stage of spawn. The stocking density of nursery pond is 2 lacks/ha. In Nursery pond fish nursed very well to prevent fish mortality.

1. • Successful fish culture largely depends
upon the quality and quantity of fish seed.
Hence, the pre stocking nursery pond
management- the first step of three tire
fish culture system.
• Are followed for optimum production of
fish seed.
Pre-stocking management ofPre-stocking management of
nursery pond for IMCnursery pond for IMC

2. INTRODUCTIONINTRODUCTION
Pre stocking management isPre stocking management is
one of the important method of entireone of the important method of entire
three tire fish farming system. Because,three tire fish farming system. Because,
fish mortality is very high at the stage offish mortality is very high at the stage of
spawn. The stocking density of nurseryspawn. The stocking density of nursery
pond is 2 lacks/ha.pond is 2 lacks/ha.
In Nursery pond fish nursedIn Nursery pond fish nursed
very well to prevent fish mortality.very well to prevent fish mortality.

3. Data about fish seedData about fish seed
►The tender spawn locally termed asThe tender spawn locally termed as
“dimpona” start feeding after three days of“dimpona” start feeding after three days of
hatching.hatching.
►Henceforth they need a congenialHenceforth they need a congenial
environment with enough food for growthenvironment with enough food for growth
and survival.and survival.
►The spawn of 5-8 mm sized are nursed inThe spawn of 5-8 mm sized are nursed in
well prepared nurseries.well prepared nurseries.
►Grown to fry of 25-30mm size in about 12-Grown to fry of 25-30mm size in about 12-
15 days.15 days.
► The weight of spawn is 0.0014gm &weightThe weight of spawn is 0.0014gm &weight
of fry is 0.5gm.of fry is 0.5gm.

4. SeleCTION Of pONDS fORSeleCTION Of pONDS fOR
NURSeRIeSNURSeRIeS
Seasonal pond, that dry up in summer areSeasonal pond, that dry up in summer are
preferable ones.preferable ones.
As nurseries since seasonal exposure ofAs nurseries since seasonal exposure of
the pond bottom to direct sunlight help inthe pond bottom to direct sunlight help in
improving pond condition.improving pond condition.
Such ponds are relatively free from weedsSuch ponds are relatively free from weeds
and unwanted fishes.and unwanted fishes.
Duck should not be allowed to enter theDuck should not be allowed to enter the
nurseries because of their predatorynurseries because of their predatory
habits.habits.

5. SIze Of NURSeRy pOND
 Nursery pond should be small &
rectangular in shape.
With an area of 0.02 to 0.04 ha (i.e. 3-6
kathas ).
 With a depth of 1 meter.

6.  Management for raising carp seedManagement for raising carp seed
 Aiming at providing the delicateAiming at providing the delicate
spawn enough space for movementspawn enough space for movement
and sufficient food in theand sufficient food in the
environment free of pond-dwellingenvironment free of pond-dwelling
enemies.enemies.
 Nurseries are specially pre pairedNurseries are specially pre paired
just before the monsoon.just before the monsoon.

7. ClearanCe of aquatiCClearanCe of aquatiC
weedsweeds
Weed infested nursery pond is detrimentalWeed infested nursery pond is detrimental
to the growth of spawns. The harmful effects ofto the growth of spawns. The harmful effects of
weeds are-weeds are-
• Limits the space for free movement of growingLimits the space for free movement of growing
spawn.spawn.
 Hampers netting operation.Hampers netting operation.
 Causes misbalance of dissolved oxygen content ofCauses misbalance of dissolved oxygen content of
water.water.
 The weeds on decomposition causes siltation.The weeds on decomposition causes siltation.
 Provides shelter for unwanted fish, mollusc, insectsProvides shelter for unwanted fish, mollusc, insects
etc.etc.
 Hampers natural food production of fish byHampers natural food production of fish by
competing with the phytoplankton by observingcompeting with the phytoplankton by observing
nutrients.nutrients.

8. Eradication of unwanted fishesEradication of unwanted fishes
(predatory fishes)(predatory fishes)
 Predatory fishes directly pray upon the youngPredatory fishes directly pray upon the young
ones.ones.
 It competing with them for space and oxygen.It competing with them for space and oxygen.
The commonly predatory fish species are-The commonly predatory fish species are-
1.1. ChannaChanna sppspp
2.2. MystusMystus sppspp
3.3. ClariasClarias batrachusbatrachus
4.4. HeteropneustesHeteropneustes fossilisfossilis
5.5. WallagoWallago attuattu , etc., etc.

9. Weed fishesWeed fishes
 Weed fishes compete with the culturalWeed fishes compete with the cultural
fishes for their demand of food.fishes for their demand of food.
 They also compete for space andThey also compete for space and
oxygen.oxygen.
 The common weed fishes are-The common weed fishes are-
1.1. PuntiusPuntius sppspp
2.2. AmblypharongodonAmblypharongodon molamola
3.3. AmbasiaAmbasia sppspp
4.4. EsomusEsomus daricusdaricus, etc., etc.

10. eradiCation of unwantederadiCation of unwanted
fishesfishes
 Repeated netting of pond eradicates most
of the fishes.
 Complete eradication is only possible by
dewatering the pond.
 This method can only be applied when
there is near by additional water source to
refill the pond.

11. Use of fish ToxicantsUse of fish Toxicants
►For complete removal of unwantedFor complete removal of unwanted
fishes in perennial pond, fishfishes in perennial pond, fish
toxicants may be use.toxicants may be use.
►It should more be economicallyIt should more be economically
when water level is low.when water level is low.
►But in case of seasonal pond dry upBut in case of seasonal pond dry up
generally summer months, devoidgenerally summer months, devoid
some fishes, hence no poisoning issome fishes, hence no poisoning is
required.required.

12. Mahua oil cakeMahua oil cake
 The most used fish toxicants is mahua oil cake.
 It containing 4-6% saponin.
 Saponin is toxic for fish
 It kills fishes at 200-250ppm, i.e. 2000-
2500kg/ha, within 4-6 hours.
 The fishes thus killed are fit for human
consumption.
 The added advantages is that it also act as a
fertilizer after its poisoning effect.

13. Manuring of pondManuring of pond
 After seven days of mahua application theAfter seven days of mahua application the
pond should be manure.pond should be manure.
 It should be manure with raw cow dungIt should be manure with raw cow dung
(RCD) @ 5000 kg/ha.(RCD) @ 5000 kg/ha.
 @ 10,000 kg/ha where mahua oil cake is@ 10,000 kg/ha where mahua oil cake is
not applied.not applied.
 Pond should manure about 10-15 daysPond should manure about 10-15 days
before the date of stocking.before the date of stocking.

14. phase Manuringphase Manuring
Beside another method ofBeside another method of
fertilization also known as “phasefertilization also known as “phase
Manuring”.Manuring”.
It also known as “partial Manuring”.It also known as “partial Manuring”.
It followed in de watered-pond forIt followed in de watered-pond for
quick preparation.quick preparation.
In this process after accumulation ofIn this process after accumulation of
rain water the following Manuringrain water the following Manuring
procedure should be followed-procedure should be followed-

15. Manuring procedureManuring procedure
1st
day 4500 kg RCD/ha
750 kg MOC/ha
360 kg SSP/ha
2nd
day No Manuring, but the pond should
be racked
3rd
day 50% of the first dose
4th
day Liming @200 kg/ha
5th
day 25% of the first dose
6th
day Eradication of aquatic insects by
soap oil emulsion
7th
day Netting and remove the died insects

16. IImportance of organic manuremportance of organic manureIImportance of organic manuremportance of organic manure
 Organic manure are applied in the pond to
increase the production of natural fish food.
 Naturals food are zooplankton, because at
this stage the hatchlings voraciously feed on
zooplankton.
 The day after eradication of aquatic insects,
spawn may be stocked.

17. Control of aquatic insects &Control of aquatic insects &
enemiesenemies
 Before releasing fish seed, the aquaticBefore releasing fish seed, the aquatic
insects, frogs and aquatic snake should beinsects, frogs and aquatic snake should be
eradicated from the nursery pond.eradicated from the nursery pond.
 It should be done by repeated netting.It should be done by repeated netting.
 By this 75% of insects and other enemiesBy this 75% of insects and other enemies
may be effectively removed.may be effectively removed.
 This operation is to be followed byThis operation is to be followed by
spraying soap-oil emulsion.spraying soap-oil emulsion.
 Which will effectively kill rest of the insectWhich will effectively kill rest of the insect
population by hampering their respirationpopulation by hampering their respiration..

18. LimingLiming
 The pond which are acidic in nature areThe pond which are acidic in nature are
less productive than alkaline ponds. Limeless productive than alkaline ponds. Lime
is used to bring to the pH to the desireis used to bring to the pH to the desire
level. In addition lime also has thelevel. In addition lime also has the
following effects-following effects-
 increases pH.increases pH.
 acts as buffer and avoid fluctuations ofacts as buffer and avoid fluctuations of
pH.pH.
 it increases the resistant of soil toit increases the resistant of soil to
parasite.parasite.
 it’s toxic effect kills the parasite.it’s toxic effect kills the parasite.
 it hastens organic decomposition.it hastens organic decomposition.

19. Oil-Soap EmulsionOil-Soap Emulsion
 This emulsion can be prepared by mixing cheepThis emulsion can be prepared by mixing cheep
detergent (18kg/ha ) in diesel oil or kerosene oildetergent (18kg/ha ) in diesel oil or kerosene oil
(56 lit/ha).(56 lit/ha).
 During preparation some water is to be added toDuring preparation some water is to be added to
make a proper emulsion.make a proper emulsion.
 The emulsion is applied at least 24 hours beforeThe emulsion is applied at least 24 hours before
releases of fish seed.releases of fish seed.
 On next day the dead insects should be removedOn next day the dead insects should be removed
by repeated drag netting.by repeated drag netting.
 The water should be thoroughly stirred so as toThe water should be thoroughly stirred so as to
remove the oily layer from the surface of water.remove the oily layer from the surface of water.
 Now pond is ready to remove the fish seed.Now pond is ready to remove the fish seed.

20. CONCLUSIONCONCLUSION
In nursery pond spawnIn nursery pond spawn
converted to fry in 10-12 days.converted to fry in 10-12 days.
So we use nursery pond 3-4So we use nursery pond 3-4
times in a year for a hatchery.times in a year for a hatchery.
So pre stocking management ofSo pre stocking management of
nursery pond has a goodnursery pond has a good
importance in aquaculture.importance in aquaculture.

21. thank
you