Ullah, Md. Amir creator Knud-Hansen, Christopher F. Chairperson Edwards, Peter Examination Committee Little, David C. Examination Committee The British Council Scholarship donor text series technical report th Bangkok Asian Institute of Technology 1989 continuing eng 67 p. This study examined the effect of duck diet, bedding material and manure storage on nutrient release characteristics of duck manure in water. A second experiment examined the effect of those factors on the suitability of duck manure for improving yields of Nil e tilapia (Oreochromis niloticus ) . The first experiment was fresh manure of low and high grade diet with and without rice husk; the second one was four week old manure of the same low grade diet as used in the first experiment, except manure was stored under two different conditions; and the third was four week old manure of high grade diet stored as in the second experiment. The accumulative ammonia-N released from manure in the first experiment varied from a minimum 6 . 5 mg / g dry matter (DM) t o a maximum 9 . 2 mg / g DM a nd soluble reactive phosphorus (SRP ) release varied f rom 1 . 7 mg / g DM to 2 . 0 mg / g DM . In second experiment , the accumulative ammonia - N release from manure varied f rom 7 . 0 t o 8 . 8 mg/g DM a nd SRP release varied from 2.2 mg / g DM to 2.6. mg / g DM . In third experiment the release of ammonia-N range from 7.lto 9. 1 mg / g DM a nd t h e SRP release varied from from 3 . 5 to 4.1 mg/g DM. Nearly all soluble nitrogen and phosphorus were released on the fourth day of manure application . The release was in creased by the improved diet management of manure. Use of bedding material of the amount of nutrient release on a per unit rate of nutrient manure and proper ca used a reduction weight basis. The improved manure obtained from high grade diet in creased the fish yield but the use of bedding materiel did not effect the fish yield significantly. A Thesis submitted in the partial fulfilment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1989 Tilapia Fishes Feeding and feeds Ducks Manure Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B17894 http://203.159.5.9/ait-thesis/detail.php?q=B17894 110920 20260818170321.0