HighlightCatfish aquaculture wastewater contains organic matter that exceeds the quality standard of 68.75 mg / L and 72.48 mg / L.Tutut Jawa snail (F. javanica) can reduce organic matter in waste by up to 92%.Susuh Kura snail (S. testudinaria) can reduce organic matter in waste by up to 87%.Catfish aquaculture wastewater treatment with snails only takes 8 hours. Abstract The residual or wastewater from the cultivation process that is discharged directly into common waters can reduce the quality of the waters because it contains a lot of organic material from organism feces and feed residue, so it needs management first. The purpose of this study was to determine the ability of Javanese snails and freshwater gastropods to reduce total organic matter in catfish culture waste. The research method used was the experiment with 2 factor Factorial completely randomized design, namely the measurement time (4, 8, 12, and 16 hours) and the abundance of the Tutut Java snail and freshwater gastropods (100%, 75%, 50%, 25%, and control) with 5 repetitions. Tutut Java snails were taken from the pond at UPR Sumbermina Dau and brought to the laboratory. The results obtained in the treatment with the addition of Tutut Java snail, the total organic matter content decreased at 75% snail density by 90% (from 68.75 mg / L to 5.31 mg / L) at the 12th hour. The treatment with the addition of Freshwater Gastropods at a density of 25%, the total organic matter content decreased by 87% (from 72.48 to 9.35 mg / L) at the 8th hour. Water quality during the study was in a condition that could tolerate the Tutut Java snails and freshwater gastropods. The conclusion is that the addition of Tutut Java snail and / or freshwater gastropods can reduce the total organic matter content to the water quality standard.
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.
Comparison of the length, weight and condition factor of Nila Tilapia (Oreochromis niloticus) was studied on oligotrophic waters (Wonorejo Reservoir) conducted from July to August 2018 and eutrophic waters (Selorejo Reservoir) on February to March 2019. All of the reservoir are in the East Java, Indonesia. The total sample from Wonorejo Reservoir about 79 fish from 3 times sampling (every two weeks), but the fish Sample from Selorejo Reservoir are 35 from 4 times sampling every week. The Nila Tilapia from Wonorejo Reservoir are 15.3 ± 2.5 cm (length) and 74.6 ± 38.6 grams (weight) but fish from Selorejo are 17.8 ± 2.2 cm average length and 114 ± 35 grams for the weight. The condition factor of Nila Tilapia in both reservoirs was relatively the same, with an average value was 1.01. The Nila Tilapia caught from Selorejo Reservoir (eutrophic) is relatively heavier and bigger than in the Wonorejo Reservoir (oligotrophic) even though the hook size is smaller. Fish from the Selorejo Reservoir (eutrophic) is easier to get food so that the average fish is larger.
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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