Read e-book online Advances in shrimp aquaculture management PDF

By Sascha W. Felix

ISBN-10: 9383048964

ISBN-13: 9789383048960

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One ppm is equal to 1 gram per m3 of water. 95 g, thus: The quantity of phosphorus to be added is found in the same manner. 7 —— = 27. 1kg. 9 kg. 6 per cent Ammonium sulfate–(NH4)2 SO4: 21 per cent Ammonium chloride–NH4 Cl: 25 per cent Ammonium nitrate–NH4 NO3: 37 per cent Calcium nitrate–Ca (NO3)2: 17 per cent The percentage of phosphorus (P) in superphosphate fertilizers are: Double super phosphate–Ca (H2 PO4): 26 per cent Triple super phosphate–P2 O5: 39 per cent Many fertilizers contain more than one primary nutrient.

Subsequently depending on the performance, the rate of application is to be adopted or determined. To assess the density of plankton developing in the pond, a ‘ secchi disc ‘ can be used. When the secchi disc reading is about 30 cm, the phytoplankton density would be good. If the secchi disc disappears from sight at less than 20 cm, the phytoplankton may be dense and the change of pond water is to be undertaken. Further, the subsequent application of fertilizers should be reduced. If the secchi disc disappears from sight beyond 35 cm, phytoplankton growth is not enough and more fertilizer should be added during the next application.

2 ppm should be considered as a base at which shrimp start to die with even a short exposure. Regarding the long-term effects of sub-lethal dissolved oxygen levels, it is reported that white areas of degenerated tissue in the tail muscles of shrimps could be associated with low levels of dissolved oxygen and high temperature. Shrimp with this condition normally will be dieing. When the affected shrimps were placed in a well-aerated tanks, the white areas however disappeared within 24 hours and the shrimp became active.

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Advances in shrimp aquaculture management by Sascha W. Felix

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