Pemijahan nila secara intensif. There are five differentiation between traditional, and intensive spawning system. That is spawning pond, density of broodstock, harvesting time, stage of cyrle life, hatching, and hormonelization.
In traditional, spawning in the natural pond by density 1 broodstock/m2. Harvesting is done in every fourteenth days, where eggs has hatched become perfectly larvas, after incubating in parent’s mouth.
In intensive, spawaning in the tank by density 4 broodstocks/m2. Harvesting is done in every tenth days, where eggs has not hatch perfectly. And then eggs hatched in the hatching tube, up to perfectly larvas.
Generally, there are four activities in tilapia intensive spawning system., that is maturation, spawning, harvesting, and hatching. In order to well, the fourth of activity have to regulated, especially its timing.
Maturition
Maturition is in the tank, by length 6 m, wide 3 m, and 1,5 m. Tank has two particular parts, are inlet, and oulet. Inlet for irrigating water before and during using, and outlet for outing water when harvesting.
Before using, tank dryed in 3 – 6 days. The aims drying is for keeling diseases, and make good environmental. Tank watered 100 cm in high, by closing outlet, and opening inlet. During maturition, water irrigate continuously by discharge 1 – 2 liters/minute.
Stocking broodstock is in the morning when law temperatures so that broodstock don’t stress. Density of broodstock are 4 broodstocks/m2. So, for a tank can be stocked 72 broodstocks. In maturation, male, and female are cultivated separated.
Everyday, broodstock fed by artificial feed 3 percents in totals weight. Giving feed is three time, are 09.00 o’clock, 12.00 o’clock, and 15.00 o’cloock. Maturation is at 4 weeks. After that, broodstock harvested, and ready to spawn.
Spawning
Spawning also is in the tank. Before using, tanks dryed 3 – 6 days. Except, for keeling disease, drying also for improve inveronmental, especially bottom of tank, because it will be using for making nests in spawning.
Spawning is mixing males, and females in a pond so that spawning. Whereas, males, and females are stocked in the same time. In order to stress, stocking broodstock is in the morning, when law temperature. During spawning, water irragte continuously.
Everyday, broodstock fed by artificial feed 3 percents in totals weight. Giving feed is three time, are 09.00 o’clock, 12.00 o’clock, and 15.00 o’cloock. Spawning is at ten day. After that, broodstock harvested.
Eggs harvesting
Pond dried by opening outlet, but in hole placed a screen, so that broodstock don’t out of pond. Drying also by substituting pipe paralon, by the other, but it has holed. After 10 cm in high, outlet closed, by replace pipe paralon.
There are four tools have to prepared, before harvesting. That are, hand closer, two scoop nets, two big pails, and three wash basin. The fourth tools enter to tank, so that easy during harvesting.
Eggs harvesting method :
- drive broodstock to a side of tank, by net driver. Driving is done two people, one hold a side of net driver, and the other hold other.
- catch a female by a scoop net, and placed above wash basin. Broodstock in incubating is signed by its mouth always closed.
- open mouth of female by forefinger, and also open twice cover gills, one by thun, and one by whip, or little finger.
- for outing eggs, Immerse female to water, and refeat two, or three times, so that all of eggs out.
- catch other females, done like that until finish.
Hatching and hormonalization (see in hatching, and sex reversal)
In traditional, spawning in the natural pond by density 1 broodstock/m2. Harvesting is done in every fourteenth days, where eggs has hatched become perfectly larvas, after incubating in parent’s mouth.
In intensive, spawaning in the tank by density 4 broodstocks/m2. Harvesting is done in every tenth days, where eggs has not hatch perfectly. And then eggs hatched in the hatching tube, up to perfectly larvas.
Generally, there are four activities in tilapia intensive spawning system., that is maturation, spawning, harvesting, and hatching. In order to well, the fourth of activity have to regulated, especially its timing.
Maturition
Maturition is in the tank, by length 6 m, wide 3 m, and 1,5 m. Tank has two particular parts, are inlet, and oulet. Inlet for irrigating water before and during using, and outlet for outing water when harvesting.
Before using, tank dryed in 3 – 6 days. The aims drying is for keeling diseases, and make good environmental. Tank watered 100 cm in high, by closing outlet, and opening inlet. During maturition, water irrigate continuously by discharge 1 – 2 liters/minute.
Stocking broodstock is in the morning when law temperatures so that broodstock don’t stress. Density of broodstock are 4 broodstocks/m2. So, for a tank can be stocked 72 broodstocks. In maturation, male, and female are cultivated separated.
Everyday, broodstock fed by artificial feed 3 percents in totals weight. Giving feed is three time, are 09.00 o’clock, 12.00 o’clock, and 15.00 o’cloock. Maturation is at 4 weeks. After that, broodstock harvested, and ready to spawn.
Spawning
Spawning also is in the tank. Before using, tanks dryed 3 – 6 days. Except, for keeling disease, drying also for improve inveronmental, especially bottom of tank, because it will be using for making nests in spawning.
Spawning is mixing males, and females in a pond so that spawning. Whereas, males, and females are stocked in the same time. In order to stress, stocking broodstock is in the morning, when law temperature. During spawning, water irragte continuously.
Everyday, broodstock fed by artificial feed 3 percents in totals weight. Giving feed is three time, are 09.00 o’clock, 12.00 o’clock, and 15.00 o’cloock. Spawning is at ten day. After that, broodstock harvested.
Eggs harvesting
Pond dried by opening outlet, but in hole placed a screen, so that broodstock don’t out of pond. Drying also by substituting pipe paralon, by the other, but it has holed. After 10 cm in high, outlet closed, by replace pipe paralon.
There are four tools have to prepared, before harvesting. That are, hand closer, two scoop nets, two big pails, and three wash basin. The fourth tools enter to tank, so that easy during harvesting.
Eggs harvesting method :
- drive broodstock to a side of tank, by net driver. Driving is done two people, one hold a side of net driver, and the other hold other.
- catch a female by a scoop net, and placed above wash basin. Broodstock in incubating is signed by its mouth always closed.
- open mouth of female by forefinger, and also open twice cover gills, one by thun, and one by whip, or little finger.
- for outing eggs, Immerse female to water, and refeat two, or three times, so that all of eggs out.
- catch other females, done like that until finish.
Hatching and hormonalization (see in hatching, and sex reversal)
