Gede Suantika
One type of fish most consumed and cultivated by the people of Indonesia is goldfish (Cyprinus carpio). This is due to the formation of the supply of carp business supply chains as economic commodities and nutritional values ​​possessed by goldfish. According to Pratama et al. (2013) Fresh goldfish contain water content of 79.65%, ash 1.06%, protein 16.04%, fat 2.51%, and 0.73%carbohydrate. & Nbsp; Carp Cultivation Consists of several core activities , including hatchery (hatchery), nursery, and grow out. The hatchery stage is usually a stage that becomes a bottleneck or inhibitors in goldfish cultivation, because carp in the larval phase tends to be more sensitive to changes in environmental factors. Mas (Cyprinus Carpio L.). One of the goldfish hatchery centers in West Java is Ciparay District, Bandung Regency. But in the last few years there has been a trend of decreased seed production so that it has an impact on the goldfish production chain in West Java as a whole. This study aims to conduct an analysis of the sustainability of goldfish farming and apply water treatment technology in the form of biofilter technology as a solution to the problem of water quality used for carp farming activities. Sustainability analysis is carried out using survey and observation techniques for data collection. The data obtained is processed using the Rapid Appraisal of Fisheries (Rapfish) analysis. Meanwhile, the application of biofilter technology is carried out using several components which include nitrification bacteria that are cultivated in the SITH laboratory. Based on the results of sustainability analysis, it can be concluded that one aspect that needs to be considered is the condition of water quality that is getting worse so that efforts need to be made on the problem of water quality used for cultivation activities. The results of the Sangata Biofilter application both in improving the quality of aquaculture water which includes physical-chemical-chemical parameters such as ammonium and nitrite which are toxic in aquaculture. Therefore, it can be concluded that the application of bioilter technology is able to improve water quality and can be used as a solution in the problem of water quality in carp farming.