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nemo
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« on: August 06, 2008, 05:09:24 PM » |
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Production strategy
- Purchase the required fry once every year of operation, especially during the peak season in May.
- Start production in the nursery pond, then the transition pond, formation pond, and finally the rearing pond.
- Divide the grow-out process into two phases: formation and rearing phases.
- Allow the fingerlings to grow from a 20g fingerling size to a 50g post-fingerling size in the formation pond using natural food organisms as primary food for the stock.
- Transfer the post-fingerlings to the rearing pond. Milkfish will grow to the marketable size of 250g in three months at an average growth rate of 2.2g/day . Expect the milkfish to grow bigger during the dry season at an average growth rate of 3g/day.
- Provide supplementary feeds to sustain fish growth particularly during the wet season when lab-lab and other natural foods in the pond are depleted. A weekly feed conditioning is necessary to determine the attractability of the feed.
- Efficient feeds should be used. Unattractive feeds results in poor health of the milkfish.
- Eradicate snail pest called suso and bangungon. These pests destroy lab-lab mat and compete with bangus for lab-lab. Use alternative molluscicide, like tobacco dust, applied at 300-400 kg/ha. Or collect the snails by sweeping or handpicking and burn them with rice straw.
Pond water management
- Increase water depth from 0.6 m to 1 m particularly during the last two months of culture operation. Note: An abrubt increase in water depth will cause lab-lab to detach and float. Install fine-meshed screens (bastidor or lumpot) at the gates to prevent the re-entry of wild species or the possible escape of stock.
- Monitor water quality parameters (turbidity, salinity, dissolved oxygen, temperature regularly to check for any sign of risk. Maintain the optimum water condition to support maximum growth of milkfish.
- Change water at least every two weeks or as frequent as possible.
- Install a stand-by water pump to maintain desired water depth when water management through tidal fluctuation is not possible.
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Stocking Density
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| Pond |
Stock |
| Nursery Pond |
40 fry/sq m |
| Transition pond |
5 fingerlings/sq m |
| Formation Pond |
2 juveniles/sq m |
| Rearing Pond |
1 grown fish/sq m |
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Milkfish production schemes
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| Pond |
Growing stage(wt-g) |
Culture period(days) |
Growth rate(g/day) |
Food type |
Harvest size(pc/kg) |
| Nursery Pond |
0.02-05 |
30 |
0.016 |
Lab-lab |
2000 |
| Transition pond |
0.5-10 |
30 |
0.32 |
Lab-labBread crumbs |
100 |
| Formationpond |
10-40 |
30 |
1.0 |
Lab-labBread crumbs |
20 |
| Rearing pond |
50-215 |
75 |
2.2 |
Lablab/pellets |
4.6 |
| Dry |
50-275 |
75 |
3.0 higher |
Lablab/pellets |
3.6 |
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Milkfish production schemes
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| Pond |
Growing size(g) |
Feed Type |
%Feed rate(biomass) |
Feeding frequency |
| Nursery Pond |
0.02-05 |
LablabStarter mash |
8-10 |
5x /day |
| Transition pond |
0.5-10 |
LablabBread crumbs/rice bran |
5-8 |
4x /day |
| Formationpond |
12-50 |
LablabBread crumbs |
4-5 |
3x /day |
| Rearing pond |
50-100100-250 |
Lablab / algaeFinisher pellets |
3 |
3-4x/day |
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Nutrient requirements of Milkfish Feed
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| Crude protein |
25-40% |
Fish meal, soybean, corn, gluten meal, ipil-ipil |
| Crude fat |
7-10% |
Vegetable and fish meal |
| Nitrogen Free extract |
25% |
Yellow corn, cassava meal |
| Crude fiber |
<8% |
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| Vitamins, minerals mix |
3-6% |
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| Metabolized energy |
>3,200kcal/kg |
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Water quality parameter
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| Parameter |
Optimum level |
| Dissolved oxygen concentration |
3-5 ppm |
| Temperature |
22-35 degrees Celsius |
| pH level |
6.8 -8.7 |
| Salinity |
18-32 ppt |
| Turbidity |
0.5 m |
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