Improvements in Water Quality of Fish Aquaculture Effluents after Treatment by Microalgae

Water improvements in aquaculture are among the critical solutions to remove ammonia resulting from biological processes. In this study, the alga Chlorella vulgaris was used to remove ammonia from the water fish farms of catfish (Clarias garepienus). Ammonia chloride was used with alga to study the response by alga to the removal rates of ammonia and the best concentration of alga. The concentration and time rates were then used in the aquaculture, in addition to measuring the water's improvement rate again. The results revealed that the improvement and treatment of variable ammonia concentration (NH4+) by using a volume of alga Chlorella vulgaris (350ml) recorded the highest percentage (75%) at ammonia concentration (10mgL-1). Approximately 60% of ammonia were removed (30mgL-1). When applied to the water fish farms for 24 and 48h, the ammonia concentration (NH4+) was markedly decreased from 10mgL-1 to 3.7mgL-1 (63%) and 2.3mgL-1 (77%) after 24h and 48h, respectively. Through applied on the fish pond, noted reduced the water used by 60% compared to the control pond. It was observed that most of the items positively influenced by algae were mainly implemented, including ammonia and other elements. This implementation is recommended in intensive aquaculture to reduce the operating costs towards achieving progress and sustainable development.