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All Journal Jurnal Teknologi Perikanan dan Kelautan BULETIN OSEANOGRAFI MARINA Jurnal Pengelolaan Perikanan Tropis (Journal Of Tropical Fisheries Management) Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences Habitus Aquatica : Journal of Aquatic Resources and Fisheries Management Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan Jurnal Perikanan Biodiversitas Journal of Biological Diversity
Bambang Widigdo
Departemen Manajemen Sumberdaya Perairan, Fakultas Perikanan Dan Ilmu Kelautan, Institut Pertanian Bogor, Jalan Agatis, Kampus IPB Dramaga, Bogor 16680, Indonesia
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Library & Information Science Social Sciences

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Growth of Chlorella sp. and Dunaliella sp. at Different Light Intensities: Pertumbuhan Chlorella sp. dan Dunaliella sp. pada Intensitas Cahaya yang Berbeda Ega Hana Masitoh Masitoh; Bambang Widigdo; Niken Tunjung Murti Pratiwi
Habitus Aquatica Vol 3 No 1 (2022): Habitus Aquatica : Journal of Aquatic Resources and Fisheries Management
Publisher : Department of Aquatic Resources Management, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/HAJ.3.1.35

Abstract

Pertumbuhan fitoplankton, seperti Chlorella sp. dan Dunaliella sp. dipengaruhi oleh intensitas cahaya. Penelitian bertujuan untuk menganalisis keterkaitan antara kepadatan Chlorella sp. dan Dunaliella sp. dengan besar intensitas cahaya yang berbeda. Kedua jenis fitoplankton tersebut ditumbuhkan pada intensitas cahaya 1000 lux, 3000 lux, dan 7000 lux. Sumber pencahayaan didapat dari lampu pendah putih (cool daylight TLD). Kepadatan diamati setiap hari selama 10 hari menggunakan haemocytometer. Analisis data dilakukan untuk menganalisis signifikansi antara pertumbuhan sel pada kondisi intensitas cahaya yang berbeda. Hasil penelitian menunjukkan bahwa kepadatan Chlorella sp. dan Dunaliella sp. tertinggi didapatkan pada intensitas cahaya 1000 lux, (4,8 × 106 sel/mL dan 1,33 × 106 sel/mL) sedangkan kepadatan terendah didapatkan pada intensitas cahaya 7000 lux. Kepadatan Chlorella sp. Lebih dipengaruhi oleh ortofosfat, sedangkan Dunaliella sp. lebih dipengaruhi oleh keberadan nitrat. Secara umum tampak bahwa perbedaan intensitas cahaya berpengaruh secara signifikan terhadap kepadatan Chlorella sp. dan Dunaliella sp.
Carapace length-weight and width-weight relationships of Scylla serrata in Bulungan District, North Kalimantan, Indonesia BAMBANG WIDIGDO; RUKISAH RUKISAH; ASBAR LAGA; AGUS A. HAKIM; YUSLI WARDIATNO
Biodiversitas Journal of Biological Diversity Vol. 18 No. 4 (2017)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d180405

Abstract

Widigdo B, Rukisah, Laga A, Hakim AA, Wardiatno Y. 2017. Carapace length-weight and width-weight relationships of Scylla serrata in Bulungan District, North Kalimantan, Indonesia. Biodiversitas 18: 1316-1323. The mud crab, Scylla serrata lives associated with mangrove ecosystems and is widely distributed in the Indo West-Pacific. The present work was aimed to reveal the carapace length/width-weight relationships of Scylla serrata in two mangrove ecosystem area of Bulungan District, North Kalimantan- Indonesia, i.e. Kahayan Delta and Tibi Island. The crabs were collected by using ambau pancang (trap) for two months from November to December 2016. A total of 522 individuals were collected and their carapace length, carapace width, and weight were measured. The sex ratio of total collected samples (male to female) was 1:0.79. Carapace length and width of S. serrata caught in these two study area ranged from 40 to 89 mm for male; 32 to 91 mm for female and 59 to 128 mm for male; 53 to 122 mm for female, respectively. The carapace length-weight relationships of total samples showed logarithmic equations as follow: W = -3.2194 + 2.9725 Log CL for male and Log W = -2.2010 + 2.3750 Log CL for female. While the carapace width-weight relationships are as follow: W = -3.9162 + 3.1012 Log CW for male and Log W = -2.6001 + 2.3968 Log CW for female. The b values of carapace width-weight relationship indicated that the growth pattern of male was positive allometric and female was negative allometric. Size frequency of crab population is also presented.
The contribution of phytoplankton in the carbon adsorption and stock during shrimp culture in brackishwater ponds Bambang Widigdo; MUHAMMAD RIFQI; ALI MASHAR; FITRINA NAZAR; YUSLI WARDIATNO
Biodiversitas Journal of Biological Diversity Vol. 21 No. 11 (2020)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d211123

Abstract

Abstract. Widigdo B, Rifqi M, Mashar A, Nazar F, Wardiatno Y. 2020. The contribution of phytoplankton in the carbon adsorption and stock during shrimp culture in brackishwater ponds. Biodiversitas 21: 5170-5177. In environmental point of view, it is important to determine the potential of adsorption and stock of blue carbon during shrimp farming in ponds with three cultivation technologies namely: extensive/traditional, semi-intensive, and intensive. The aquatic primary productivity approach is used to measure the potential of carbon adsorption in shrimp ponds, while the carbon conversion of chlorophyll-a content is used to measure its stock. The primary productivity and chlorophyll-a content were measured using three ponds for each cultivation technology every ten days from stocking (DOC 0) until the harvest period. The sampling location is in the BLUPPB shrimp pond area of Karawang, West Java - Indonesia. The study concluded that the adsorption and stock of blue carbon varied during shrimp farming in ponds. The primary productivity and chlorophyll-a content of the three cultivation technologies were the significant difference as the results of ANOVA Single Factor. Carbon adsorption average during extensive/traditional, semi-intensive, and intensive shrimp farming in ponds was 1.912832 g C m-3 day-1, 7.097145 g C m-3 day-1 and 8.250195 g C m-3 day-1, respectively. While, the average carbon stock during shrimp farming in extensive/traditional, semi-intensive, and intensive ponds were 0.64896 g m-3, 14.97473 g m-3, and 25.11102 g m-3, respectively.
Pemetaan Mangrove Area Tergenang Menggunakan Google Earth Engine dan Random Forest Moch Farid; Taryono Taryono; Bambang Widigdo; Fery Kurniawan
Buletin Oseanografi Marina Vol 15, No 3 (2026): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v15i3.81553

Abstract

Ekosistem mangrove memiliki peran strategis sebagai penyerap karbon, pelindung pantai dari abrasi, dan penyedia habitat bagi keanekaragaman hayati. Namun, pemetaan mangrove di area tergenang menghadapi tantangan serius akibat kompleksitas spektral yang tinggi. Penelitian ini bertujuan: (1) memetakan distribusi spasial mangrove di pesisir Brebes, Jawa Tengah, menggunakan algoritma Random Forest (RF) yang diimplementasikan pada platform Google Earth Engine (GEE) dengan 12 fitur spektral citra Sentinel-2A Level-2A; (2) mengevaluasi kinerja akurasi model dibandingkan pendekatan berbasis indeks tunggal; serta (3) mengidentifikasi variabel spektral paling berpengaruh dalam membedakan mangrove di area tergenang. Metode meliputi akuisisi citra periode Januari–September 2024, ekstraksi fitur spektral (6 band dan 6 indeks vegetasi), serta klasifikasi menggunakan 150 pohon keputusan. Hasil penelitian mengidentifikasi total sebaran mangrove seluas 1.023,28 ha, terbagi dalam kelompok hutan mangrove (531,87 ha) dan kelompok tambak berpola linier mengikuti pematang budidaya (491,41 ha). Validasi model menggunakan 237 titik uji menunjukkan akurasi sangat tinggi (Overall Accuracy 96,27%; Koefisien Kappa 0,925; F1-Score 0,962; User's Accuracy 96,64%), melampaui pendekatan indeks tunggal MVI sebesar 9,46%. Analisis variable importance mengungkapkan MMRI, B12 (SWIR2), dan NDVI sebagai fitur paling berpengaruh, menegaskan peran krusial indeks vegetasi-air gabungan dalam identifikasi mangrove di lingkungan jenuh air.
Co-Authors AGUS A. HAKIM ALI MASHAR Anhar, T. Faizul Apriadi Budi Raharja ASBAR LAGA Dewayani Sutrisno Dewayany Sutrisno Ega Hana Masitoh Masitoh Endang Sri Wahyuni FERY KURNIAWAN Fery Kurniawan FITRINA NAZAR Fitriyana Fitriyana Fredinan Yulianda Imam Soehadi Jaki Mochtar Moch Farid MUHAMMAD RIFQI Niken Tunjung Murti Pratiwi RUKISAH RUKISAH Sulistiono Sulistiono Taryono Taryono Yusli Wardiatno