Effects of manure fertilization frequency on pond culture of the freshwater prawn,Macrobrachium rosenbergii(de Man)

摘要

Abstract.The effects of the frequency of manure application (twice weekly, weekly and fortnightly) on prawn production and pond dynamics in culture ofMacrobrachium rosenbergii(de Man) were assessed. Juvenile freshwater prawns were cultured for 100 days using pelleted feed and organic fertilizer. Results showed that the greatest (but not significantly different) marketable prawn yield was achieved with fortnightly manuring, but the most stable pond environment as based on oxygen dynamics, developed with weekly fertilization. The highest concentrations of chlorophyll, nitrogen and phosphorus occurred with fortnightly applications, but so too did the lowest ratio of gross primary production: respiration. System dynamics are discussed.