Bakteri merupakan mikroorganisme yang secara alami berada dalam ekosistem perairan laut dan beberapa spesiesnya bersifat patogen. Penelitian ini bertujuan untuk menentukan pola fluktuasi populasi bakteri secara umum dan Vibrio spp. secara khusus di perairan pantai dan teluk sebagai dampak dari aktivitas baik panti pembenihan, tambak udang, maupun karamba jaring apung (KJA) di pesisir Bali Utara. Sampel air diperoleh dari tiga lokasi sentra budidaya laut dan satu lokasi ekowisata yang berada di Kecamatan Gerokgak Kabupaten Buleleng. Sampel air diambil dari tiga titik sampling di perairan dengan jarak 50 m, 100 m, dan 300 m dari garis pantai di Desa Gerokgak dan Desa Penyabangan. Sampling air dilakukan pada tiga titik sampling di sekitar KJA di Teluk Kaping, Desa Sumberkima, dan satu titik sampling di perairan dengan jarak 100 m dari garis pantai di Desa Pemuteran. Sampling air dilakukan sekali dalam sebulan dari bulan Februari hingga November 2018. Hasil penelitian menunjukkan bahwa total bakteri dan Vibrio spp. di empat lokasi perairan di Kecamatan Gerokgak, Bali menunjukkan populasi tinggi pada bulan Maret hingga Mei dan menurun pada bulan berikutnya. Dan meningkat kembali pada bulan Oktober hingga November. Total bakteri dan Vibrio spp. tertinggi terjadi di perairan pantai Desa Gerokgak hingga 9.067 ± 7.481 CFU/mL dan 1.147 ± 689 CFU/mL dibandingkan dengan dua lokasi sentra budidaya lainnya (Desa Penyabangan dan Teluk Kaping). Total bakteri dan Vibrio spp. teramati pula di perairan Desa Pemuteran hingga 500 ± 52 CFU/mL dan 65 ± 7 CFU/mL yang kemungkinan merupakan dampak dari aktivitas budidaya ikan. Pola fluktuasi populasi bakteri di perairan pantai Kecamatan Gerokgak, Bali dipengaruhi oleh musim dan kegiatan budidaya perikanan. Tingginya populasi bakteri Vibrio spp. pada perairan pantai dapat memengaruhi kesehatan ikan budidaya.Bacteria are a group of microorganisms naturally present in aquatic ecosystems. Some of the bacteria are pathogenic to other organisms and cause severe diseases. This study aimed to determine the fluctuation patterns of bacterial populations, with specific interest to Vibrio spp. in coastal and bay areas of North Bali which constantly receive effluents from nearby mariculture activities. Water samples were collected from three locations in a clustered marine fish farming area and one location in an ecotourism area as a control. Water samples were taken from three sampling points in the coastal area of Gerokgak and Penyabangan villages at a distance of 50 m, 100 m, and 300 m from the coastline. Water samples were also collected at three sampling points around floating net cages (KJA) in Kaping Bay, Sumberkima Village, and one sampling point in Pemuteran Village located 100 m from the coastline. Water sampling was carried out each month from February to November 2018. Results of the study showed that total bacteria and Vibrio spp. were notably higher between March-May and October-November. The total bacteria and vibrio reached the peak number at 9,067 ± 7,481 CFU/mL and 1,147 ± 689 CFU/mL, respectively, which occurred in the coastal waters of Gerokgak Village. The total bacteria and Vibrio spp. of up to 500 ± 52 CFU/mL and 65 ± 7 CFU/mL, respectively, were also observed in the waters of Pemuteran Village which are likely to be the effects of aquaculture activities in these of three locations. This study concludes that the fluctuation pattern of bacterial population in the coastal waters of Gerokgak District, Bali is primarily influenced by the season and activities of the fish farming. The high population of Vibrio spp. in the coastal waters could lead to a fish disease oubreak related to the pathogenic bacterium.
Buangan limbah organik dari kegiatan budidaya ikan berdampak pada naiknya konsentrasi senyawa nitrogen di perairan. Tujuan penelitian ini adalah untuk mengetahui sebaran vertikal konsentrasi total nitrogen (TN), total fosfat (TP), dan amonia pada perairan pesisir yang berdekatan dengan kawasan budidaya ikan laut di Bali Utara. Titik sampling dipilih pada kedalaman 5, 10, 15, 20, dan 30 meter dengan arah tegak lurus garis pantai di kawasan perbenihan ikan dengan tingkat aktivitas tinggi (Desa Gerokgak dan Desa Penyabangan) dan tiga titik sampling di sekitar karamba jaring apung (KJA) di Teluk Kaping, Desa Sumberkima. Sampel air diambil pada bagian permukaan, tengah, dan dasar pada tiap titik sampling. Penelitian ini dilakukan pada tahun 2019 dengan dua periode waktu yaitu bulan April sampai Juni dan Agustus sampai Oktober dengan satu kali pengambilan contoh air setiap bulan. Hasil penelitian menunjukkan bahwa sebaran konsentrasi TN, TP, dan amonia secara vertikal cenderung homogen pada tiap titik pengamatan. Konsentrasi TN, TP, dan amonia selama penelitian berturut-turut adalah 1,2-1,5 mg/L; 0,081-0,090 mg/L; dan 0,054-0,057 mg/L. Nilai tersebut berada di bawah baku mutu air untuk kebutuhan budidaya ikan. Sebaran konsentrasi senyawa nitrogen dan fosfat secara vertikal di lokasi penelitian relatif homogen pada semua lapisan kedalaman air yang diamati. Kondisi tersebut menunjukkan bahwa proses percampuran masa air terjadi secara merata di kawasan tersebut. Kualitas perairan di lokasi penelitian masih sesuai dengan nilai baku mutu untuk kegiatan budidaya laut.Direct discharge of organic waste from aquaculture platforms is likely to increase nitrogen concentration in the surrounding waters. The study aimed to investigate the vertical distribution of total nitrogen (TN), total phosphorus (TP), and ammonia concentration in the coastal waters adjacent to the three densest mariculture sites in North Bali (Gerokgak, Penyabangan, and Kaping Bay). Field surveys were conducted six times within two periods namely April to June and August to October 2019. Samples of different water columns (surface, middle, and bottom) were collected using a Nansen water sampler in each sampling point. The samples were immediately analyzed at the Research Institute for Mariculture and Fishery Extension, Gondol. Total nitrogen, total phosphate, and ammonia were analysed using sulfuric acid destruction and distillation, nitrate-acid destruction, and phenol-spectrophotometer, respectively. The result showed that TN, TP, and ammonia levels were 1.2-1.5 mg/L, 0.081-0.090 mg/L, and 0.054-0.057 mg/L, respectively. The vertical distribution of nitrogen and phosphorus compounds at all layers of water column were relatively homogenous indicating a strong mixing between the seawater layers. Thus, the study concludes that the variations of all water quality parameters are within the water quality standard needed for mariculture activities.
Teknologi budidaya abalon telah tersedia dan dilakukan dengan berbagai metode budidaya pendederan dan pembesaran. Namun, hingga saat ini belum berkembang di masyarakat karena kurangnya minat pengusaha/pembudidaya abalon untuk mengaplikasikan secara komersial. Hal ini disebabkan oleh kualitas dan kuantitas benih belum stabil, pertumbuhan lambat, biaya tinggi, dan memerlukan waktu pemeliharaan lebih lama. Oleh karena itu, perlu diupayakan metode yang lebih sederhana dengan biaya murah untuk pembesaran abalon. Penelitian ini bertujuan untuk membandingkan pertumbuhan dan produksi abalon dengan padat tebar berbeda pada sistem-sistem tangki air mengalir. Benih abalon dipelihara di bak beton ukuran 12 m x 0,8 m x 0,8 m; kepadatan 70% dan 80% dari luasan dasar bak. Sementara untuk menghitung kelayakan usaha, rumus yang digunakan adalah revenue cost ratio (R/C). Hasil penelitian menunjukkan bahwa pertumbuhan panjang, lebar dan bobot cangkang pada densitas 70% lebih baik dibandingkan dengan densitas 80%. Kepadatan 70% menghasilkan 8,98% peningkatan hasil biomassa dan kematian 6,51% lebih tinggi dari kepadatan 80%. Berdasarkan analisis ekonomi, sistem pembibitan ini layak secara ekonomi di mana padat tebar 70% dari total luas dasar memiliki keuntungan finansial terbaik.Breeding technology for abalone is available, and its farming can be done using different nursery and grow-out methods. However, abalone farming has not yet been commercially practiced due to the lack of interest from fish entrepreneurs/fish farmers. This is due to several factors related to the quality and quantity of seeds, such as inconsistent availability, slow growth, high cost, and long culture was period. Therefore, it is necessary to develop a simpler and inexpensive method to culture abalone. This research aimed to improve the rearing technique for abalone. Two concrete tanks of 12 m x 0.8 m x 0.8 m in size were used in which abalone seeds were stocked with stocking densities of 70% and 80% of the bottom area. The concrete tanks were equipped with a flow-through water circulation system. The business feasibility of the culture system was calculated using the revenue cost ratio (R/C) formula. The results showed that the growth in length, shell width and weight at a density of 70% was better than that of the density of 80%. The density of 70% resulted in an 8.98% increase in biomass yield and a 6.51% mortality higher than a density of 80%. Based on the economic analysis, this nursery system is economically feasible where the stocking density of 70% of the total bottom area has the best financial return.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.