REMOVAL OF NITROGEN AND PHOSPHORUS OF TILAPIA FARMING WASTE (OREOCHROMIS NILOTICUS) BY BUTTERHEAD LETTUCE (LACTUCA SATIVA L. VAR. CAPITATA)HEFNI EFFENDI, PRASETIA AJITAMA AND SIGID HARIYADIAbstract The aim of this research was to examine the ability of butterhead lettuce (Lactuca sativa L. var. Capitata) to absorb the nitrogen and phosphorus derived from the waste of tilapia (Oreochromis niloticus) cultivation in a aquaponic system. Tilapia was cultivated along with three treatments of plant namely T1 (without plants), T2 (10 plants) and T3 (20 plants). The experiment lasted for 6 weeks. TAN, Ammonia (NH3 and NH4), NO2, NO3 and PO4 were lower in the treatment of T3 than those at T1 and T2. N and P uptake in T3 was higher than that of in T2. In the term of lettuce growth performance, RGR (Relative Growth Rate) and SR (Survival Rate) were similar. FCR (Food Conversion Ratio) of fish in T2 was higher than that of in T3, while T3 had better SGR and SR
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