THE PREPARATION OF WASTEWATER AS NUTRIENT SOURCE FROM Plectropomus leopardus SEED PRODUCTION IN AERATION AND NONAERATION CONDITION TO CULTIVATE Nannochloropsis oculata  

The residue of protein in faces and uneaten feed from aquaculture land based activity especially seed production was still remain high and affect a water quality in coastal waters. In this contex, the study aimed to measure the change of nitrogen content in aquaculture wastewater of Plectropomus leopardus seed production along 14 days aeration and non-aeration treatment. The wastewater from treatment reactor were collected in 2 days interval and used as media to cultivate microalgae Nannochloropsis oculata. Ammonia, nitrite, nitrate and phosphate was determined spectrophotometrically along wastewater treatment. The ammonium ion was determined by hidrogen and nitrate valeu. The increased concentration of ammonia, nitrate and nitrite  in aeration treatment were changed more faster compared to non-aeration treatment. The phosphate change have same pattern in both aeration and non-aeration. The nutrient concentration were remain high at the end of wastewater treatment. After cultivation of  microalgae N. oculata, concentration in all nutrient is very low. This results showed that the uses of N. oculata could shorten the time of waste treatment.