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August 26, 2013


Substrates Increase Freshwater Prawn Production by 100%


From Abstract: In this study, the production of giant freshwater prawns (Macrobrachium rosenbergii) and Nile tilapia (Oreochromis niloticus) in carbon/nitrogen-controlled, periphyton-based polyculture systems were evaluated.  Three different management practices were compared: the traditional practice without addition of periphyton substrates and carbohydrate (the control), addition of maize flour to maintain a carbon:nitrogen (C:N) ratio of 20:1 (treatment CN) and addition of both maize flour and periphyton substrates (treatment CN+P).  All ponds were stocked with three prawns and one monosex Nile tilapia per square meter.  Bamboo side shoots, covering an area of 171 square meters, were posted vertically into the pond bottoms for periphyton development.  A locally formulated and prepared feed containing 17% crude protein with a C:N ratio close to 15:1 was applied twice daily to all ponds, based solely on the weight of the prawns.  Water quality parameters, except total alkalinity, did not vary significantly among treatments.  Both organic matter and total heterotrophic bacterial loads in the sediment were significantly higher in treatment CN+P followed by treatment CN and the control.  Periphyton biomass in terms of dry matter and chlorophyll a values constantly decreased during the culture period.  The substrates in the CN+P treatment contributed 66% and 102% higher net yield of prawns than CN and control treatments, respectively.


Source: Aquaculture Research.  Effects of C/N Ratio and Periphyton Substrates on Pond Ecology and Production Performance in Giant Freshwater Prawn Macrobrachium Rosenbergii (De Man, 1879) and Tilapia Oreochromis Niloticus (Linnaeus, 1758) Polyculture System.  M. Rezoanul Haque), M. Ashraful Islam, M. Mojibar Rahman, Mst. Farzana Shirin, M. Abdul Wahab (email, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh, Mymensingh, Bangladesh) and M. Ekram Azim.  Online Version, Published Before Inclusion in an Issue.  August 25, 2013.


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