Articles

HUBUNGAN ANTARA DISTRIBUSI FITOPLANKTON DENGAN KUALITAS PERAIRAN DI SELAT ALAS, KABUPATEN SUMBAWA, NUSA TENGGARA BARAT Radiarta, I Nyoman
Bumi Lestari Journal of Environment Vol 13, No 2
Publisher : Udayana University

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Abstract

AbstractPlankton (phytoplankton and zooplankton) has an essential factor for aquatic ecosystem,because plankton is a primary food source for aquatic animals. This study was carried outin the Alas Strait, Sumbawa Regency on May 2012. Based on the data collected from 32stations, phytoplankton distributions (abundance and ecology indexes), water qualitycondition, and relationship between them were examined. Phytoplankton identificationresults show that a total of 25 species was found, and that species were classified into sevenclasses. Bacillariophyceae (diatom) was the dominant class found in the study area. Pearsoncorrelation indicated that water temperature, transparency, salinity, nitrate, and phosphatewere the parameters significantly affected on phytoplankton distribution and abundance.The results from this study could contribute on the development marine aquaculture in thisregion in term of pearl aquaculture development.
Observation of Wild Seaweed Species in Labuhanbua Waters, Indonesia: a preliminary assessment for aquaculture development Erlania, Erlania; Radiarta, I Nyoman
Journal Omni-Akuatika Vol 13, No 1 (2017): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (994.315 KB) | DOI: 10.20884/1.oa.2017.13.1.172

Abstract

Seaweed industry has been growing up and is supplied by either wild or cultivated seaweed crops. This study was aimed to present relevant information regarding ecological availability of wild seaweed in Labuhanbua coastal waters, Sumbawa Regency, West Nusa Tenggara and potential use of important species as candidate species for aquaculture. 46 sampling stations were determined along line transects perpendicular to coastal line; and seaweeds sampling were conducted during low tide by using 1 x 1 m2 quadrat transect. Field data consist of in-situ parameter including number of seaweed species and coverage area of each species; and ex-situ parameters consist of carbohydrate, protein, total C, total N, and total P content of seaweeds. The results showed that 33 species were found and three species has the most widely distribu tion, i.e. Padina sp., Dictyota dichotoma, and Gracilaria salicornia. Turbinaria, Dictyota, Padina, Stoechospermum, Hydroclathrus, Halimeda, and Chaetomorpha might be some important species that could be develop as aquaculture species candidates among other uncultivated species that were found along this study location. They have potencies as human food, livestock feed, neutraceuicals, cosmetics, pulp, textile, biofuel and any other industries; but conversely, they were found in lower density at Labuhanbua coastal waters. These species should be develop through aquaculture technology, involve genetic improvement and possibly genetic engineering. Commercial scale cultivation of those important seaweed species will contribute to industrial needs and prevent decreasing of wild seaweed availability in natural ecosystem.
ANALISIS KESESUAIAN DAN DAYA DUKUNG PERAIRAN UNTUK PENGEMBANGAN BUDIDAYA RUMPUT LAUT DI KABUPATEN SIMEULUE, ACEH Radiarta, I Nyoman; Erlania, Erlania; Haryadi, Joni
Jurnal Segara Vol 14, No 1 (2018): April
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v14i1.6626

Abstract

Rumput laut merupakan salah satu primadona produksi perikanan budi daya di Indonesia. Ektensifikasi lokasi budi daya rumput laut telah menyebar sampai ke pulau-pulau terdepan Indonesia. Perluasan kawasan ini harus didukung oleh ketersediaan data dan informasi yang akurat tentang kesesuaian perairan lokasi budi daya. Penelitian ini bertujuan untuk melakukan analisis spasial kesesuaian dan daya dukung perairan untuk pengembangan budi daya rumput laut di Kabupaten Simeulue, Aceh. Penelitian dilaksanakan pada Agustus 2015, dan berlokasi di tiga teluk besar yaitu Teluk Sibigo, Teluk Dalam, dan Teluk Sinabang. Analisis spasial kesesuaian lahan dilakukan dengan sistem informasi geografis berdasarkan multi criteria evaluation dengan menggabungkan tiga submodel yaitu fisik dan geografi, kualitas air, dan sosial infrastruktur. Daya dukung kawasan dihitung dengan pendekatan kapasitas unit budi daya di perairan tersebut. Hasil analisis menunjukkan bahwa ketiga teluk memiliki potensi pengembangan dengan luasan yang bervariasi: 159 ha (Teluk Sibigo), 808 ha (Teluk Dalam), dan 684 ha (Teluk Sinabang). Perhitungan daya dukung menunjukkan bahwa Teluk Dalam mempunyai kapasitas yang terluas yaitu 494,7 ha. Pemanfaatan kawasan secara maksimal dapat mencapai produksi berkisar antara 723-3030 ton/siklus tanam. Kesesuaian lahan (zonasi) dan daya dukung perairan yang dihasilkan dalam penelitian ini dapat dijadikan landasan penting mendukung penerapan budi daya perikanan yang berbasis ekosistem.
GEOGRAPHIC INFORMATION SYSTEM-BASED MODELING AND ANALYSIS FOR SITE SELECTION OF GREEN MUSSEL, Perna viridis, MARICULTURE IN LADA BAY, PANDEGLANG, BANTEN PROVINCE Radiarta, I Nyoman; Albasri, Hatim; Sudradjat, Achmad
Indonesian Aquaculture Journal Vol 6, No 1 (2011): (June 2011)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (284.709 KB) | DOI: 10.15578/iaj.6.1.2011.83-90

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Green mussel is one of important species cultured in Lada Bay, Pandeglang. To provide a necessary guidance regarding green mussel mariculture development, finding suitable site is an important step. This study was conducted to identify suitable site for green mussel mariculture development using geographic information system (GIS) based models. Seven important parameters were grouped into two submodels, namely environmental (water temperature, salinity, suspended solid, dissolve oxygen, and bathymetry) and infrastructural (distance to settlement and pond aquaculture). A constraint data was used to exclude the area from suitability maps that cannot be allowed to develop green mussel mariculture, including area of floating net fishing activity and area near electricity station. Analyses of factors and constraints indicated that about 31% of potential area with bottom depth less than 25 m had the most suitable area. This area was shown to have an ideal condition for green mussel mariculture in this study region. This study shows that GIS model is a powerful tool for site selection decision making. The tool can be a valuable tool in solving problems in local, regional, and/or continent areas.
VERTICAL-HORIZONTAL WATER QUALITY PROFILES OF BATUR LAKE, BANGLI DISTRICT, BALI SUPPORTING SUSTAINABLE LAKE MANAGEMENT Sagala, Sophia; Radiarta, I Nyoman
Indonesian Aquaculture Journal Vol 7, No 2 (2012): (December 2012)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1364.039 KB) | DOI: 10.15578/iaj.7.2.2012.157-169

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Batur Lake located in Bangli District is one of fisheries-basedregions in Bali with niletilapia as the main cultured species. Monitoring on environmental conditions of the lake was carried out to get the vertical and horizontal water quality profiles of the lake. Climatology condition of the area was also presented in the study. The study area were between 8o13’-8o18’ S and 115o22’-115o26’ E. Field survey was done with random and transect sampling points distribution. The water quality monitored in the lake essential ly covers important parameters such as depth, transparency, temperature, pH, dissolved oxygen, salinity, nutrients (ammonia, nitrate, nitrite, and phosphate), sulfide, chlorophyll, and planktonic composition. Results of spatial analysis (vertically and horizontal ly) of water quality indicated that oxygen concentration up to 10 m deep is still appropriate for nile tilapia culture. Nutrient (phosphate, ammonia, nitrate, and nitrite) contents of the lake meet the standard levels set by Ministry of Environment of Indonesia, and were still suitable for aquaculture operation at depth 710 m. From climatology point of view, it is known that the extreme climate occurred in June-August resulting in water mass changes, thus, affecting aquaculture sustainability in the lake.
THE USE OF REMOTE SENSING, REGRESSION QUANTILES, AND GIS APPROACHES FOR MODELING OF SCALLOP LARVAE: A Case Study in Funka Bay, Hokkaido, Japan Radiarta, I Nyoman
Indonesian Aquaculture Journal Vol 6, No 2 (2011): (December 2011)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (229.859 KB) | DOI: 10.15578/iaj.6.2.2011.191-204

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In the development of scallop cultivation in Japan, larvae collection and propagation become an important factor. Although the monitoring program has been conducted, modeling of species distribution is becoming an important tool for understanding the effects of environmental changes and resources management. This study was conducted to construct a model for providing estimation of the scallop larvae distribution in Funka Bay, Hokkaido, Japan using the integration of remote sensing, Regression Quantile (RQ) and Geographic Information System (GIS)-based model. Data on scallop larvae were collected during one year spawning season from April to July 2003. Environmental parameters were extracted from multi sensor remotely sensed data (chlorophyll-a and sea surface temperature) and a hydrographic chart (water depth). These parameters together with larvae data were then analyzed using RQ. Finally, spatial models were constructed within a GIS by combining the RQ models with digital map of environmental parameters. The results show that the model was best explained by using only sea surface temperature. The highest larvae densities were predicted in a relatively broad distribution along with the shallow water regions (Toyoura and Sawara to Yakumo) and the deeper water areas (center of the bay). The spatial model built from the RQ provided robust estimation of the scallop larvae distributions in the study area, as confirmed by model validation using independent data. These findings could contribute on the monitoring program in this region in order to distinguish the potential areas for an effective spat collection.
MANAGEMENT OF SUSTAINABLE SEAWEED (Kappaphycus alvarezii) AQUACULTURE IN THE CONTEXT OF CLIMATE CHANGE MITIGATION Erlania, Erlania; Radiarta, I Nyoman
Indonesian Aquaculture Journal Vol 9, No 1 (2014): (June 2014)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.204 KB) | DOI: 10.15578/iaj.9.1.2014.65-72

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Seaweed is an important aquaculture commodity that could contribute on climate change mitigation, related to its ability on absorbing CO2, as one of the green house gases, through photosynthesis. This study aimed to analyze seaweed potencies on carbon sequestration in the context of climate change mitigation while still resulting optimum production as primary purpose and to analyze the carrying capacity of Gerupuk Bay in order to manage sustainability of seaweed aquaculture. Seaweed, (Kappaphycus alvarezii) was cultivated with long-line system in Gerupuk Bay, West Nusa Tenggara, during five months for three cultivation cycles. Samplings were conducted at days-15, 30, and 45 with CO2 absorption rates as main parameters. Water carrying capacity was calculated to determine the ability of Gerupuk Bay waters for supporting development of sustainable seaweed aquaculture. The results showed that absorption rates of CO2 by seaweed (K. alvarezii) were different at each sampling days of cultivation periods; the highest value was at 10-20 days of cultivation. CO2 absorption analysis resulted based on sampling days of cultivation period could be appl ied to formulate the strategies for management of sustainable seaweed aquaculture, with optimal production and positively contributed to the environment. However, waters carrying capacity should also be considered as major aspect in the application of seaweed cultivation management, thus it can run continuously without causing conflicts with other interests.
FREQUENT MONITORING OF WATER TEMPERATURE IN PEGAMETAN BAY, BALI: A PRELIMINARY ASSESSMENT TOWARDS MANAGEMENT OF MARINE AQUACULTURE DEVELOPMENT Radiarta, I Nyoman; Erlania, Erlania; Sugama, Ketut; Yudha, Hirmawan Tirta; Wada, Masaaki
Indonesian Aquaculture Journal Vol 9, No 2 (2014): (December 2014)
Publisher : Pusat Penelitian dan Pengembangan Perikanan, Badan Penelitian dan Pengembangan Kelautan da

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1126.007 KB) | DOI: 10.15578/iaj.9.2.2014.177-185

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Aquaculture currently share for nearly half of the world’s food fish consumption, and continue to be the fastest-growing animal food producing sector. The viability of aquaculture operation has greatly been affected by the characteristic of marine environment. Inventory and monitoring of marine environment are necessary and can be done through information technology implementation. Frequent monitoring of water temperature, for almost one year observation, at four aquaculture sites in Pegametan Bay and Research and Development Institute for Mariculture was investigated. Water temperature data were obtained by using logger and buoy systems. These data were contrasted against marine fish mortality. On the other hand, the suitability of species requirements with the thermal conditions was evaluated by comparing temperature range to the optimum and lethal temperature information available on marine fish species of aquaculture interest. This research could be beneficial for enhancing productivity of marine aquaculture operation in terms of possible impact of climate change. It was also possible to find the ideal temperature range for culturing fish species, taking into account the variability associated with large-scale phenomena.
KONDISI KUALITAS PERAIRAN DI KABUPATEN MOROWALI PROVINSI SULAWESI TENGAH: PENDEKATAN SPASIAL DAN STATISTIK MULTIVARIAT Radiarta, I Nyoman; Hasnawi, Hasnawi; Mustafa, Akhmad
Jurnal Riset Akuakultur Vol 8, No 2 (2013): (Agustus 2013)
Publisher : Pusat Riset Perikanan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.55 KB) | DOI: 10.15578/jra.8.2.2013.299-309

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Kondisi kualitas perairan di suatu wilayah dapat dipengaruhi oleh berbagai faktor, di antaranya proses alami dan dampak dari aktivitas manusia. Oleh karena itu, pemantauan kualitas perairan yang dapat memberikan estimasi kualitas perairan yang representatif dan sesuai sangat diperlukan. Statistik multivariat yang dikombinasikan dengan analisis spasial telah digunakan dalam penelitian ini untuk menganalisis kondisi kualitas perairan di Kabupaten Morowali. Sembilan parameter penting kualitas perairan telah dikumpulkan pada bulan Juni 2011. Hasil analisis klaster menunjukkan bahwa kualitas perairan di lokasi penelitian dikategorikan menjadi dua kelompok (klaster 1 dan 2). Dengan menggunakan analisis komponen utama diperoleh sebanyak empat signifikankomponen dengan persentase kumulatif sebesar 69,180% dari total ragam. Analisis spasial dari komponen utama menunjukkan pola yang serupa dengan klaster analisis yaitu secara umum wilayah penelitian terbagi menjadi dua wilayah dengan karakteristik yang berbeda. Dengan pendekatan statistik multivariat ini dapat digunakan untuk merancang pengambilan titik pengamatan di masa yang akan datang sehingga lebih efektif dan efisien.
PERBEDAAN SIKLUS TANAM BUDIDAYA RUMPUT LAUT, Kappaphycus alvarezii, TERHADAP VARIABILITAS TINGKAT SERAPAN KARBON Erlania, Erlania; Radiarta, I Nyoman
Jurnal Riset Akuakultur Vol 9, No 1 (2014): (April 2014)
Publisher : Pusat Riset Perikanan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (574.235 KB) | DOI: 10.15578/jra.9.1.2014.111-124

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Rumput laut merupakan komoditas penting kelautan dan perikanan. Komoditas ini selain berperan untuk peningkatan ekonomi masyarakat pesisir juga mempunyai fungsi sebagai penyerap karbon. Penelitian ini telah dilaksanakan untuk menganalisis pengaruh perbedaan waktu siklus tanam terhadap tingkat serapan karbon oleh rumput laut, Kappaphycus alvarezii, terkait fluktuasi kondisi lingkungan perairan. Rumput laut dibudidayakan dengan sistem long line di Perairan Teluk Gerupuk selama tiga siklus tanam pada bulan Juli-November 2012. Pengamatan dan analisis sampel rumput laut dilakukan pada hari ke-0, 15, 30, dan 45 untuk masing-masing siklus tanam, dengan parameter yang dianalisis adalah laju serapan karbon, laju pertumbuhan harian, dan produktivitas budidaya. Pengukuran parameter kualitas air dilakukan secara in situ untuk mengetahui fluktuasi kondisi perairan Teluk Gerupuk. Data yang terkumpul dianalisis menggunakan metode statistik deskriptif dan inferensia. Hasil penelitian menunjukkan bahwa siklus tanam rumput laut yang berlangsung pada musim tanam berbeda memberikan pengaruh pada perbedaan pola serapan karbon oleh rumput laut hasil budidaya. Tingkat serapan karbon tertinggi dari tiap siklus diperoleh pada waktu yang sama yaitu pada periode awal budidaya, dengan nilai berturut-turut 33,13; 88,73; dan 18,16 ton C/ha/tahun. Budidaya yang berlangsung pada saat musim tanam produktif memberikan serapan karbon yang optimum, dan sebaliknya saat musim tanam kurang produktif serapan karbon yang dihasilkan juga minimum.