Sangkuriang catfish aquaculture produces waste in the form of organic matter from the remaining feed and metabolic waste. Previous study revealed that the organic matter found in the outlet part of the fishpond was three times higher than the inlet. The attempt to decrease organic matter in that study was performed using freshwater clam and Bacillus subtilis bacteria; however, the decrease was less than 80% within 5 days. This study aims to obtain a maximum decrease level of organic matter with the fastest time of degradation. The experimental method with a Completely Randomized Plot Design (Split Plot Design) was employed in this study. The primary treatments (main plot) were time while the sub-plot was the surface area of bacterial attachment media. The time was set within 72 hours with an observation interval of 12 hours. The areas of the attachment media were 25%, 50%, 75%, 100% of the surface diameter of the experimental pail. The attachment media used in this study was synthetic coir. The control treatment was done without the attachment media (0%). The experiment was conducted in a laboratory under a facultative anaerobic condition. The level of organic matter and the total of bacterial suspension (TPC) in the water were observed every 12 hours. Organic matter was measured using a KMnO4 oxidizer. The results study indicated that adhering 100% of the surface of the attachment media decreased organic matter by 93.7% within 72 hours (three days). The total bacteria in water media within 12 hours was 0.5x102 CFU/ml, while the total bacteria within 72 hours was 26x102 CFU/ml. It can be concluded that the utilization of the bacterial attachment media has accelerated the decrease of organic matter in the wastewater of Catfish aquaculture with a stable amount of bacterial suspension.
Waters that are presumably contaminated with heavy metals need to be observed to ensure the level of pollution to perform water restoration This study aims to determine the status of water quality based on the content of heavy metals in the dry season and rainy season. The survey method was employed in this study, and it was conducted in Pasuruan sea waters in different seasons; September 2019 represented the dry season, and April 2020 represented the rainy season. The water sampling stations were chosen by using purposive sampling in three sampling locations: the sea waters of Kraton, Lekok, and Nguling districts. The heavy metals and water quality parameters were analyzed by using Storet Index. The results indicated that the highest level of heavy metals was found in Lekok waters in September, consisting of Hg (1.22 mg/l), Cd (1.20 mg/l), and Pb (0.55 mg/l). The seawater of Nguling district had the lowest content in April, while Kraton's seawater was moderate. The water quality status based on the Storet Index suggested that the sea waters of Kraton, Lekok, and Nguling districts were classified as moderately polluted with a score of -16 to -24. The highest score was in September in the rainy season with a score of -24 and the score in April in the dry season was -16. It means that the score is increasing but still in the moderately polluted category. The measurement results of temperature, pH, dissolved oxygen, salinity, and current velocity were in optimum results for aquatic organisms in the dry season or the rainy season. Regarding the water quality status in Pasuruan sea waters, it can be concluded that the heavy metal contents exceeded the quality standard set by the government. Therefore, improved management is required to prevent the deterioration of the pollution status in Pasuruan sea waters.
Marine cultivation is an activity in a certain area in coastal waters. The development of marine aquaculture in Indonesia in the future is very important for the development of the fisheries sub-sector, and is one of the priorities that is expected to be a driver of economic growth. Selection of the right location is an important factor in determining the feasibility of a cultivation business to analyze the characteristics of the water conditions of Sabang Bay, espesially regarding its feasibiity as a location for marine aquaculture. Data collection was carried out on a secondary and primary basis. The waters of Sabang Bay have water quality indicators that support the life of fishery commodities. The bay are in Sabang has the potensial for seaweed cultivation and floating net cage cultivation, such as Tilapia, Grouper, Snapper, and Lobster. Based on the analysis of the quality of the waters and the bottom substrate of the waters in The Sabang Bay, they are categorized as suitable and very suitable
Air limbah budidaya udang setelah akhir masa pemeliharaan memiliki kandungan bahan organik total (TOM) yang tinggi sampai 87.74 mg/L. Apabila air limbah tersebut dibuang secara langsung tanpa upaya penurunan atau pengolahan, akan mengganggu ekosistem perairan umum karena tingginya bahan organik tersebut. Tujuan dari penelitian ini untuk mengetahui kecepatan penurunan bahan organik pada limbah budidaya tambak. Penelitian dilaksanakan pada bulan Januari 2021. Air sampel limbah tambak diambil dari tambak pada masa akhir pemeliharan (120 hari pemeliharaan). Jenis merek dagang konsorsium bakteri yaitu EM 4 , Bio HS, BIO Prisma, Starbio plus, BIO2000, dan Biolet. Penelitian eksperimen disusun dalam rancangan Acak Lengkap 6 perlakuan dan 4 ulangan. Masing-masing perlakuan diisi 2 liter air limbah ditambah 6 ml konsorsium bakteri yang berbentuy cair. Sedangkan untuk konsorsium bakteri yang padat di tambahakan 1 gram/L. Pengukuran bahan organik total, suhu, pH, oksigen terlarut, salinitas dan karbondioksida dilakukan setiap 24 jam selama 72 jam pengamatan. Hasil penelitian menunjukan selama 72 jam perendaman persen penurunan bahan organik tertinggi pada perlakuan E (BIO 2000) sebesar 95 % (87,74 mg/L menjadi 4,11 mg/L). Persen penurunan terendah pada perlakuan D (Starbio plus) sebesar 83,4% (87,74 mg/L menjadi 14,54 mg/L). Namun, secara umum 6 jenis merek dagang konsorsium bakteri dapat menurunkan bahan organik. Kadar suhu, pH, oksigen terlarut dan salinitas dalam kondisi optimum, sedangkan karbondioksida melebihi ambang batas yang disebabkan oleh tingginya aktivitas perombakan bahan organik oleh bakteri. Kesimpulan yang diperoleh merek dagang konsorsium bakteri BIO2000 paling efektif dalam menurunkan bahan organik selama 72 jam.
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