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NITRIFIKASI DALAM BIODEGRADASI LIMBAH TAMBAK Hasan Sitorus; Bambang Widigdo; Bibiana W . Lay; Kadarwan Soewardi
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 12 No. 1 (2005): Juni 2005
Publisher : Institut Pertanian Bogor

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Penelitian ini bertujuan untuk mengetahui laju nitrifikasi dan bakteri yang paling efektif membentuk nitrat dalam biodegradasi limbah tambak udang. Percobaan dilakukan dengan 6 perlakuan dan 3 ulangan dengan media percobaan limbah tambak biasa dan limbah tambak steril. Hasil percobaan memperlihatkan bahwa semakin tinggi kadar OSS dalam media percobaan, laju nitrifikasi semakin rendah, tetapi populasi mikroba nitrifikasi semakin tinggi. Laju nitrifikasi berkisar antara 0.0059 – 0.0089 ppm/hari, dengan laju tertinggi diperoleh pada perlakuan T2 (kadar TSS 200 ppm, OSS 147.30 ppm, amonia 0.22 ppm) dan terendah pada perlakuan T0 (kadar TSS 100 ppm, OSS 58.20 ppm, amonia 0.19 ppm). Bakteri nitrifikasi yang paling efektif membentuk nitrat dalam media percobaan adalah Nitrococcus sp. untuk perlakuan T0 dan T1, Nitrospira sp.untuk perlakuan T2 dan T3, dan Nitrobacter sp. untuk perlakuan T4 dan T5. Dalam media limbah tambak steril, laju nitrifikasi setiap jenis bakteri berkisar antara 0.0039 – 0.0069 ppm/hari dengan tingkat efektivitas rata-rata 72.02%. Bakteri yang paling efektif membentuk nitrat dalam biodegradasi limbah tambak udang adalahNitrospira marina.Kata Kunci: biodegradasi, limbah tambak udang, nitrifikasi.

ESTIMASI DAYA DUKUNG LINGKUNGAN PESISIR UNTUK PENGEMBANGAN AREAL TAMBAK BERDASARKAN LAJU BIODEGRADASI LIMBAH TAMBAK DI PERAIRAN PESISIR KABUPATEN SERANG Hasan Sitorus; Bambang Widigdo; Bibiana W . Lay; Kadarwan Soewardi
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 12 No. 2 (2005): Desember 2005
Publisher : Institut Pertanian Bogor

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Penelitian ini bertujuan untuk mengestimasi daya dukung lingkungan pesisir Kabupaten Serang untuk pengembangan budidaya tambak berdasarkan laju biodegradasi limbah organik tambak di perairan pesisir. Laju biodegradasi OSS adalah 10.78 ppm/hari untuk perlakuan T0 (kontrol), 14.24 ppm/hari untuk perlakuan T1 (TSS 100 ppm, OSS 58.08 ppm), 12.75 ppm/hari untuk perlakuan T2 (TSS 200 ppm, OSS 145.72 ppm),11.34 ppm/hari untuk perlakuan T3 (TSS 300 ppm, OSS 234.22 ppm), 9.38 ppm/hari untuk perlakuan T4(TSS 400 ppm, OSS 321.86 ppm), dan 8.40 ppm/hari untuk perlakuan T5 (TSS 500 ppm, OSS 410.35 ppm). Dengan musim tanam udang 2 kali dan laju biodegradasi OSS 14.76 ppm/hari, daya dukung maksimum lingkungan pesisir Kabupaten Serang untuk budidaya tambak udang adalah 1 090.55 ha untuk tambak intensif,2 220.82 ha untuk tambak semi intensif, dan 12 595.07 ha untuk tambak tradisional plus. Kombinasi optimum luas tambak yang sesuai dengan potensi lahan tambak adalah 149.16 ha (13.6%)tambak intensif, 975.61 ha (42.6%) tambak semi intensif, dan 5 875.23 ha (43.8%) tambak tradisional plus.Kata kunci: daya dukung, budidaya udang, biodegradasi, zona pesisir.

Produktitvitas Diatom Perifitik yang Ditumbuhkan pada tipe Subtrat Berbeda Sebagai Alternatif Penyediaan Pakan Alami Udang Pratiwi, Niken T.M.; Adiwilaga, Enan M.; Widigdo, Bambang; Soedharma, Dedi
JURNAL BIOLOGI INDONESIA Vol 4, No 3 (2007): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

ABSTRACTThe Productivity of Periphytic Diatom Grown on Different Types of Substrates asan Alternative on Providing Natural Feed for shrimp. Providing natural feed is anattempt to support fisheries culture in a polite way for the sustainability of environment.Periphytic community is living aquatic resources that have a potential value for thispurpose. The major component of saline water periphytic community is diatom.The study was emphasized on diatom presentation grown on two types of artificialsubstrates: biocrete (sand, palm fiber, cement) and zeocrete (zeolite, palm fiber, cement).The reseach was conducted in laboratory with an experimen design follows split splitplot in times. The aim of the research is to study the ecological factor and availablenutrients to support the growth of periphitic diatoms (Amphora, Cyclotella, Melosira,Navicula, Phaeodactylum, and Thallassiosira) on two different substrates. Theproductivity of diatom, and the effect of shrimp larvae on the diatom productivity werealso analyzed. Two fertilized materials (biocrete and zeocrete) with two main treatmentsand three levels of treatments each, and unfertilized materials were used as artificialsubstrates for periphitic diatoms. The results show that all treatment could give sufficientbiological available nutrient for the diatoms. The highest diatom productivity was achievedby the population on third level ratio of fertilized biocrete and zeocrete (added by fertilizedwith N:P ratio of 30:l). Diatom productivity follows the shrimp larvae grazing. Theshrimp larvae could grow well on the media with diatom that were grown on fertilizedbiocrete.Key words: periphytic diatoms, natural feed, biocrete, zeocrete, productivity

DISTRIBUTION OF MONOGONONT ROTIFERS, Branchionus spp IN NORTH SULAWESI Rimper, Joice; Kaswadji, Richardus; Widigdo, Bambang; Sugiri, Nawangsari; Rumengan, Inneke
Marine Research in Indonesia Vol 32, No 2 (2007)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

In order to characterize the distribution pattern of rotifers Brachionus spp. in North Sulawesi, sample collections have been conducted at four locations, two at east coast and other two at west coast of North Sulawesi peninsula, which are connected to Maluku and Sulawesi Seas, respectively. At each location, a 40 p.m mesh size plankton net with a 0.3 m opening diameter was horizontally towed at three sites to represent coastal water, estuary and brachkiswater pond. Sampling periods were in January and August 2005 to represent west monsoon and east monsoon, respectively. Each sampling was performed twice a day during high and low tide. Some environmental factors were also measured in situ during the sampling. Three species of Brachionus were found during the survey, Brachionus rotundiformis, B. caudatus and B. quadridentatus. Their abundances were significantly different, both between locations and sampling sites. However, among the similar habitat such as between Manembo-nembo and Minanga brachkishwater ponds, B. rotundiforms abundance was not significantly different. This species was the most abundant compared to the other two species, in average 1984,4 ind/m3, while the other species was as low as 26,1 ind/m3 and 212,9 ind/m3 for B. caudatus and B. quadridentatus, respectively. The abundance of rotifers in northern areas connected to Molluccas Sea is higher compared to those in the southern areas connected to Sulawesi Sea. Distribution of B. caudatus is very similar to those of B. rotundiformis, while B. quadridentatus appears to have its specific pattern. Results of this study suggest that the abundance and species composition of the rotifers reflect trophic status of the aquatic ecosystem in the area. It is still awaiting future studies to elaborate the impacts of the trophic gradients in horizontal distribution of rotifers. Therefore, it is necessary to conduct a long term monitoring with emphasis on the structure of rotifer assemblages in a variety of sites subjected to environmental perturbations, including anthropogenic contaminant inputs.

TINGKAT PEMANFAATAN PAKAN DAN KELAYAKAN KUALITAS AIR SERTA ESTIMASI PERTUMBUHAN DAN PRODUKSI UDANG VANAME (Litopenaeus vannamei, Boone 1931) PADA SISTEM INTENSIF Tatag Budiardi; Chairul Muluk; Bambang Widigdo; Kardiyo Praptokardiyo; Dedi Soedharma
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 15 No. 2 (2008): Desember 2008
Publisher : Institut Pertanian Bogor

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ABSTRAKPenelitian tingkat pemanfaatan pakan dan kelayakan kualitas air serta estimasi pertumbuhan dan produksi udang vaname (Litopenaeus vannamei) pada sistem intensif telah dilakukan di Pelabuan Ratu, Jawa Barat pada bulan Mei sampai Agustus. Tujuan penelitian ini adalah untuk mengevaluasi tingkat pemanfaatan pakan dan kelayakan kualitas air pada sistem budidaya udang vaname intensif. Penelitian ini didasarkan pada observasi enam tambak selama satu masa pemeliharaan (100 hari) dengan desain kausal dan metode ex postfactountuk mendapatkan data kualitas air dan produksi udang. Hasil penelitian menunjukkan, bahwa penurunan kualitas air mulai terjadi pada pemeliharaan hari ke-40 dan terus menurun sampai akhir pemeliharaan. Tingkat pemanfaatan pakan yang tinggi menghasilkan kelayakan kualitas air dan laju pertumbuhan yang tinggi sehingga menghasilkan produksi biomassa udang yang tinggi. Model hubungan jumlah pakan yang diberikan (x) dan biomassa yang dihasilkan (y) berupa regresi kuadratik y = 0.00006x2 + 1.3506x + 7.3864 (R2 = 0.9801) sehingga biomassa maksimum tercapai pada 7 593 kg dengan pemberian pakan sebanyak 11 255 kg atau FCR sebesar 1.48.Kata kunci: sistem intensif, udang, pakan, kualitas air, biomassa, tambak.ABSTRACTA study on feed utilization, and the suitability of water quality and the estimation of vaname shrimp (Litopenaeus vannamei) growth and production of an intensive system was conducted in Pelabuan Ratu, West Java during Mei-Agustus. The research was aim at evaluating feeding practices, and suitability of its water quality obtained. This study was based on observations six ponds during one growout period (100 days) with causal design and ex post-facto method to obtain data on water quality and production. The result showed that degradation of water quality occurred not until the 40th day of cultivation, and progressively decreased up to the end of the growout period. The high level of feed utilization produced suitable water quality, and high shrimp growth rates, thus, yielding high shrimp biomass. Feed-shrimp biomass relationship could be expressed by the following quadratic regression: y = 0.00006x2 + 1.3506x + 7.3864 (R2 = 0.9801), from which the maximum shrimp biomass was reached at 7 593 kg on 11 255 kg feed, giving a feed conversion ratio of 1.48.Keywords: intensive system, shrimp, feed, water quality, biomass, tambak.

Kajian potensi kawasan mangrove di kawasan pesisir Teluk Pangpang, Banyuwangi Apriadi Budi Raharja; Bambang Widigdo; Dewayani Sutrisno
Depik Vol 3, No 1 (2014): April 2014
Publisher : Faculty of Marine and Fisheries, Syiah Kuala University

Abstrak. Penelitian ini bertujuan untuk mengkaji potensi ekonomi kawasan mangrove serta potensi luas kawasan yang dapat dijadikan sebagai sempadan pantai. Adapun metode analisis yang digunakan yaitu nilai ekonomi mangrove di bagian barat Teluk Pangpang dengan menggunakan metode effect on production (EOP) dan kesesuaian kawasan sempadan pantai. Berdasarkan hasil kajian, diperoleh utilitas konsumen dari kawasan mangrove adalah sebesar Rp.33.187.626,12. Dengan jumlah nelayan mangrove sekitar 350 orang dan luas daerah penangkapan sekitar +489 Ha, maka nilai ekonomi sumberdaya kawasan mangrove dilihat dari fungsi pemanfaatan langsung adalah sebesar Rp.32.189.744,06 per hektar per tahun. Sedangkan untuk potensi kawasan yang dapat dijadikan sebagai kawasan sempadan pantai dari hasil perhitungan tumpang-tindih (overlay) dapat dihasilkan wilayah yang termasuk dalam kategori sangat sesuai yaitu + 127,5 ha, sedangkan sesuai luas + 257 Ha, dan kurang sesuai seluas + 442,1 ha dan tidak sesuai yaitu + 1.910,1 ha.Abstrak dalam bahasa indonesia, tidak lebih dari 250 kata (garamond fond 11)Kata kunci : Teluk Pangpang; Ekonomi mangrove; Sempadan pantai; Rehabilitasi

Pengaruh Pemberian Bahan Organik Terlarut (GLUKOSA) Terhadap Kelangsungan Hidup Larva Ikan Betutu ,Oxyeleotris marmorata (Blkr) Muhammad Jamal; Ridwan Affandi; Bambang Widigdo; Kadarwan Soewardi
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 2 No. 2 (1994): Desember 1994
Publisher : Institut Pertanian Bogor

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Suatu penelitian untuk mengetahui pengaruh pemberian glukosa ke dalam media pemeliharaan terhadap kelangsungan hidup laIVa ikan betutu, Oxyeleotris mamlOrata, Blkr telah dilaksanakan di laboratorium. LaIVa ikan betutu yang baru menetas (0 hari) dipelihara pada stoples beIVolume 1 liter dengan penambahan glukosa tertentu, sehingga tekanan osmotik berkisar antara ° -476,0 mOsm/kg H20. Hasil penelitian menunjukkan bahwa media pemeliharaan laNa terbaik adalah 91,0 mOsm/kg H20 dan memberikan derajat kelangsungan hidup laIVa tertinggi sebesar : 94,44 % ,82,22 % dan 27,44 % pada jam ke 40,72 dan 120.Kata-kata kunci : glukosa, larva, derajat kelangsungan hidup

KAJIAN DAYA DUKUNG LINGKUNGAN KAWASAN PERTAMBAKAN DI PANTURA KABUPATEN GRESIK JAWA TIMUR V. D. Prasita; Bambang Widigdo; S. Hardjowigeno; S. Budiharsono
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 15 No. 2 (2008): Desember 2008
Publisher : Institut Pertanian Bogor

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ABSTRAKPenelitian ini dilakukan untuk mengkaji daya dukung lingkungan kawasan pertambakan di Gresik Jawa Timur. Metode yang digunakan adalah metode survei dan pengumpulan data sekunder dari berbagai hasil penelitian lain maupun hasil laporan instansi terkait. Penelitian ini menggunakan tiga pendekatan analisis daya dukung lingkungan, yaitu: analisis regresi, metode kuantitatif ketersediaan air di perairan, dan metode pembobotan yang diambil dari kelas kesesuaian lahan. Hasil kajian memperlihatkan bahwa pemanfaatan lahan pesisir untuk pertambakan di daerah studi sudah melampaui daya dukung lingkungannya. Fenomena ini terlihat dari produksi tambak maksimum 12 134.4 ton pada saat luas lahannya 10 943.5 ha pada tahun 1999. Dengan pendekatan pertama, analisis regresi, luas lahan yang dapat didukung untuk budidaya tambak tradisional sebesar 9 378.89 ha. Pendekatan kedua dengan metode kuantitatif menghasilkan luas lahan yang dapat didukung untuk budidaya tradisional, semi-intensif dan intensif berturut-turut 9 413.49 ha, 1 647.36 ha dan 941.35 ha. Pendekatan terakhir menghasilkan luas area yang dapat didukung untuk kegiatan budidaya bandeng (Chanos chanos) sebesar 9 882.89 ha dan budidaya udang secara tradisional sebesar 9 457.28 ha. Hasil penilaian daya dukung lingkungan pertambakan dengan tiga pendekatan tersebut saling mendukung dan melengkapi dalam proses penentuan batas pengembangan maupun pengelolaan kawasan pertambakan di daerah studi secara berkelanjutan.Kata kunci: kawasan pertambakan, kesesuaian lahan, daya dukung lingkungan.ABSTRACTThis research was carried out to analyze the environmental carrying capacity of brackishwater fishponds. The research had been conducted in Gresik, East Java by using the survey method and collecting secondary data from the other researches and related institutions. In this research, three approaches used for analyzing the environmental carrying capacity of the brackishwater fishponds zone, ie.: regression analysis, quantitative method for water availability and weighted methods for land suitability grade. The result showed that utilization of coastal land for the brackishwater fishponds surpassed to its environmental carrying capacity. This phenomenon had once showed in 1999 that maximum production of brackishwater ponds of 12 134.4 tons occupied 10 943.5 ha land areas. By using regression analysis, land area suggested for aquaculture is 9 378.89 ha. By using water quantity method, the land areas suggested for traditional, semi-intensive and intensive cultures are 9 413.49 ha, 1 647.36 ha and 941.35 ha, respectively. The third approach suggested that the land which can be used for milkfish (Chanos chanos) culture is 9 882.89 ha and for shrimp culture is 9 457.28 ha. Those results are useful to assess sustainable development and management of brakishwater pond zone in the North Coast of Gresik Regency.Key words: brackishwater pond area, land suitability, environmental carrying capacity.

DISTRIBUTION OF MONOGONONT ROTIFERS, Branchionus spp IN NORTH SULAWESI Rimper, Joice; Kaswadji, Richardus; Widigdo, Bambang; Sugiri, Nawangsari; Rumengan, Inneke
Marine Research in Indonesia Vol 32 No 2 (2007)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

In order to characterize the distribution pattern of rotifers Brachionus spp. in North Sulawesi, sample collections have been conducted at four locations, two at east coast and other two at west coast of North Sulawesi peninsula, which are connected to Maluku and Sulawesi Seas, respectively. At each location, a 40 p.m mesh size plankton net with a 0.3 m opening diameter was horizontally towed at three sites to represent coastal water, estuary and brachkiswater pond. Sampling periods were in January and August 2005 to represent west monsoon and east monsoon, respectively. Each sampling was performed twice a day during high and low tide. Some environmental factors were also measured in situ during the sampling. Three species of Brachionus were found during the survey, Brachionus rotundiformis, B. caudatus and B. quadridentatus. Their abundances were significantly different, both between locations and sampling sites. However, among the similar habitat such as between Manembo-nembo and Minanga brachkishwater ponds, B. rotundiforms abundance was not significantly different. This species was the most abundant compared to the other two species, in average 1984,4 ind/m3, while the other species was as low as 26,1 ind/m3 and 212,9 ind/m3 for B. caudatus and B. quadridentatus, respectively. The abundance of rotifers in northern areas connected to Molluccas Sea is higher compared to those in the southern areas connected to Sulawesi Sea. Distribution of B. caudatus is very similar to those of B. rotundiformis, while B. quadridentatus appears to have its specific pattern. Results of this study suggest that the abundance and species composition of the rotifers reflect trophic status of the aquatic ecosystem in the area. It is still awaiting future studies to elaborate the impacts of the trophic gradients in horizontal distribution of rotifers. Therefore, it is necessary to conduct a long term monitoring with emphasis on the structure of rotifer assemblages in a variety of sites subjected to environmental perturbations, including anthropogenic contaminant inputs.

PRODUKTITVITAS DIATOM PERIFITIK YANG DITUMBUHKAN PADA TIPE SUBTRAT BERBEDA SEBAGAI ALTERNATIF PENYEDIAAN PAKAN ALAMI UDANG Pratiwi, Niken T.M.; Adiwilaga, Enan M.; Widigdo, Bambang; Soedharma, Dedi
JURNAL BIOLOGI INDONESIA Vol 4, No 3 (2007): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jbi.v4i3.3262

ABSTRACTThe Productivity of Periphytic Diatom Grown on Different Types of Substrates asan Alternative on Providing Natural Feed for shrimp. Providing natural feed is anattempt to support fisheries culture in a polite way for the sustainability of environment.Periphytic community is living aquatic resources that have a potential value for thispurpose. The major component of saline water periphytic community is diatom.The study was emphasized on diatom presentation grown on two types of artificialsubstrates: biocrete (sand, palm fiber, cement) and zeocrete (zeolite, palm fiber, cement).The reseach was conducted in laboratory with an experimen design follows split splitplot in times. The aim of the research is to study the ecological factor and availablenutrients to support the growth of periphitic diatoms (Amphora, Cyclotella, Melosira,Navicula, Phaeodactylum, and Thallassiosira) on two different substrates. Theproductivity of diatom, and the effect of shrimp larvae on the diatom productivity werealso analyzed. Two fertilized materials (biocrete and zeocrete) with two main treatmentsand three levels of treatments each, and unfertilized materials were used as artificialsubstrates for periphitic diatoms. The results show that all treatment could give sufficientbiological available nutrient for the diatoms. The highest diatom productivity was achievedby the population on third level ratio of fertilized biocrete and zeocrete (added by fertilizedwith N:P ratio of 30:l). Diatom productivity follows the shrimp larvae grazing. Theshrimp larvae could grow well on the media with diatom that were grown on fertilizedbiocrete.Key words: periphytic diatoms, natural feed, biocrete, zeocrete, productivity

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