AMMONIA REMOVAL OF CATFISH (CLARIAS SP) CULTIVATION WASTEWATER USING VETIVER GRASS (VETIVERIA ZIZANIOIDES)HEFNI EFFENDI, BANI NUR ARSY, BAGUS AMALRULLAH UTOMO3, GIRI MARUTO DARMAWANGSA AND YUSLI WARDIATNOAbstract Ammonia concentration of catfish culture wastewater underwent reduction up to 90.73% under vetiver treatment. Length and weight range of catfish under vetiver treatment was higher than that of without vetiver. Similarly, survival rate of catfish at vetiver treatment was higher compared with that at the control. Vetiver was able to remove ammonia and grow under recirculating system of catfish culture by utilizing nutrient resulted from organic substance decomposition of uneaten fish food, feces, and urine. Nitrate and total phosphate concentration remained high at the end of experiment (third week) denoting that decomposition process has still been taking place.
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