Observation:
1) Ammonia level too high, feed leftover too many at the tank bottom
2) Udang galah growth rate is superbly slow
3) Poor health condition observed on their shell, very black color. This is due to the dirt, toxic and waste grow on their shell day to day
4) Some of the udang galah is stuck at the tank wall and died.
5) Tank with the sand and clay at the bottom shows more survival than the one without
6) Comparison with the ones from the pond, which comes from the same batch and released the same day show a vast difference in size and health (refer picture)
7) Immediately after the one from the tank is put into cold freshwater, it molts (salin kulit). This shows that the udang galah is not very comfortable with its own dirty shell (refer picture)
Improvement:
1) Need a water flowing system for freshwater to flow daily
2) Need a good filtering system to filter the waste at the bottom
3) Lime and fertilizer must be applied frequently
4) Feeding must be observed carefully, cannot have too much waste.
Conclusion:
1) Udang galah still can survive in the dirtiest water possible but only the strong will live longer.
2) Many improvements needed to ensure success in fibre tank growout
3) Key point is ammonia level; control item is feeding, filtering, fresh flowing water and fertilizer
4) Tank bottom needed to put sand or sand and clay to absorb some ammonia and waste.
5) Maybe something need to be done to improve the udang growth inside the tank, becausethe only depends on the feeding we give and lacks natural food. Maybe some experts in fibre tank aquaculture can advise some special fertilizer or safe chemical to boost their growth.
NOTE: Udang galah observed is 3 weeks old
Anyway, will keep you posted on any progress
Red arrow: Udang from pond
Yellow arrow: Udang from tank
Red arrow: Newly molt udang from tank
Yellow arrow: Old shell, notice the black color on the shell due to dirty substances
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