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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Jurnal Ilmu Pertanian Indonesia Jurnal Teknologi Perikanan dan Kelautan Jurnal Ilmu dan Teknologi Kelautan Tropis Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Forum Pasca Sarjana Maspari Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences POSITRON Biologi Edukasi : Jurnal Ilmiah Pendidikan Biologi Maspari Journal JAM : Jurnal Aplikasi Manajemen Al-Ahkam Jurnal Perikanan dan Kelautan Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Widyariset Jurnal Kelautan Tropis BERITA BIOLOGI Journal of Applied Geospatial Information JURNAL ENGGANO Omni-Akuatika MAJALAH ILMIAH GLOBE BULLETIN OF THE MARINE GEOLOGY Jurnal Pengelolaan Perikanan Tropis (Journal Of Tropical Fisheries Management) Dinamika Maritim Jurnal Penelitian Perikanan Indonesia Jurnal Kelautan Nasional Jurnal Segara Jurnal Sosial Ekonomi Kelautan dan Perikanan Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital International Journal of Remote Sensing and Earth Sciences (IJReSES) JURNAL METEOROLOGI DAN GEOFISIKA STI Policy and Management Journal Widyariset Jurnal Bali Membangun Bali Indonesian Journal of Oceanography COJ (Coastal and Ocean Journal) Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan Jurnal Meteorologi dan Geofisika Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital The International Journal of Remote Sensing and Earth Sciences (IJReSES)
I Wayan Nurjaya
Bogor Agricultural University
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Preliminary study oceanography and environmental parameters of habitat endemic species Halmahera walking shark (Hemiscyllium halmahera) on Indopacific Ocean Area in North Maluku Indonesia Nyoman Metta N Natih; Nebuchadnezzar Akbar; Dietriech G Bengen; I Wayan Nurjaya; Riyadi Subur; Abdurrachman Baksir; Firdaut Ismail; Iswandi Wahab; Dondy Arafat; Rustam E Paembonan; Abdul Ajiz Siolimbona; Rasidi Rasidi; Asep Sandra Budiman; Beginer Subhan
Depik 2025: Special Issue ICMF
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.0.0.46913

Abstract

The Halmahera Walking Shark (Hemiscyllium halmahera) is an endemic species in the Halmahera Sea. Information related to the environment in general has not been described in a complex manner. The environment is the main factor to support the life of biota. Environmental characteristics are a determining factor in the sustainability of biota. The study aims to provide information related to the physical environment of the habitat of the H. halmahera species. Primary data collection was carried out directly (in situ). Current data was taken using the Lagrange method using a currents drogue. Tides using tidal palms and observed for 24 hours. Secondary data was taken from Marine Copernicus and the Geospatial Information Agency (BIG). All data were tabulated and analyzed by Ocean Data View (ODV) software. The results of the study found that the surface current velocity was found to be in the fast current category. Current speed descriptively provides information on the life of H. halmahera. Primary data shows that the direction of the surface current moves to the east and north. Secondary data in vertical distribution shows weak zonal and meridional current shifts. The tidal pattern was found to be two high and low tides (semidiurnal). The distribution of surface temperature was found to be around 30-32oC. The vertical temperature profile found three layers, namely 1-13m (30oC), 65m (25oC) and 71m (20oC). The chemical environment showed all normal variables. The physical and chemical environmental conditions support H. halmahera to inhabit the sea area of Morotai Island. The environmental description has provided a brief understanding of how the ecological role of the H. halmahera species. Management and sustainability of the environment in the future due to climate change can be done with information on habitat characteristics.Keywords:coral triangleHalmaheranicheNorth Malukutropical
Condition and zonation of mangrove ecosystems in the small islands around the area crossed by the equatorial line of North Maluku Province Najamuddin Najamuddin; Abdurrachman Baksir; Nebuchadnezzar Akbar; Firdaut Ismail; Abdul Ajiz Siolimbona; Dondy Arafat; Rustam E Paembonan; Raismin Kotta; Beginer Subhan; Irmalita Tahir; Nyoman MN Natih; Eko S Wibowo; Ikbal Marus; I Wayan Nurjaya; Dietriech Geoffrey Bengen
Depik Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.32075

Abstract

The South Halmahera Islands feature a comprehensive marine coastal ecology. The ecosystems found were seagrass, mangrove and coral reef ecosystems. The components that sustain the existence of this ecosystem are employed equitably because of its geographical location on the equator. Mangrove ecosystems that provide benefits directly and indirectly to the community. The purpose of this study was to determine the condition of the mangrove ecosystem based on the hemispherical photography method and the type of zonation. Tawabi Island, Kayoa, South Halmahera Regency served as the site of the equator research. The research station is determined as many as 3 stations. Mangrove percent cover canopy using the hemispherical photography and transect quadrant for density. Field data gathering procedures with transects drawn perpendicular from the sea to the land. Zonation characteristics and thickness using zone tracking. Density mangrove using ecology analysis and zonation using canvas 9.0. The results of the research founded were Rhizophora apiculata, Rhizophora mucronata and Sonneratia alba. Mangrove percent cover canopy were good category (75-81%), where station I (75%), station II (81%) and station III (77%). Station I having 600 trees per ha, station II having 500 trees per ha, and station III having 400 trees per ha (low density category). Mangroves were found in 3 zones Sonneratia alba, Rhizophora apiculata and Rhizophora mucronata. The mangrove thickness from sea to land at station I (65 meters), station II (69 meters) and station III (42 meters).Keywords:biodiversitycoastalequator lineHalmaheratropical
Sedimentation Profile in Coastal Water Jakarta Bay: Profil Sedimentasi Perairan Pesisir Teluk Jakarta Nandi Abdul Aziz; Yonvitner; Sigid Hariyadi; Syamsul Bahri Agus; I Wayan Nurjaya
Jurnal Pengelolaan Perikanan Tropis (Journal of Tropical Fisheries Management) Vol 6 No 1 (2022): Journal of Tropical Fisheries Management
Publisher : Departement of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jppt.v6i1.43452

Abstract

The waters of Jakarta Bay are one of the waters that are influenced by several fresh water flows that enter from the DKI Jakarta area and its surroundings. Sediment that enters the waters of Jakarta Bay is produced by the activities of the people who live in the Jakarta area and its surroundings. This study aims to analyze the sedimentation and distribution of suspended solids in the Jakarta Bay estuary using an observational approach and spatial analysis. This study uses the Inverse Distance Weighting (IDW) interpolation method. The dominant distribution of sediment in Jakarta Bay is sand with a size ranging from 0.25 to 0.125 mm. TSS (Total Suspended Solids) levels in 11 estuaries in Jakarta Bay ranged from 21 to 150 mg/L in first period and 11 ˗ 259 mg/L in second period. Sedimentation rates that occurred in 11 Jakarta Bay estuaries ranged from 11.12 g/cm2/day to 619.5 g/cm2/day in period one and 10.96 g/cm2/day to 1232.06 g/cm2/day in the second period which is located in Muara Cilincing in both periods. There is a suitable relationship between the TSS value and the sedimentation rate. Estuary TSS values and sedimentation rates are influenced by seasons and anthropogenic activities that occur in the estuary such as reclamation.
Mechanisms of Vertical Mixing Over the Shelf Region in the Southwestern Arafura Sea Muhammad Raafi; Yuli Naulita; I Wayan Nurjaya; Rastina
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.70438

Abstract

Vertical mixing regulates nutrient supply and productivity in surface layer, yet the controlling mechanisms remain unclear. Over shelf regions such as the southwestern Arafura Sea, steep topography and strong semidiurnal tides suggest that internal tide topography interactions may enhance turbulence. Unfortunately, observational links among stratification, topographically driven mixing processes, and internal tides remain limited in this region. This study investigates the dominant mechanisms controlling vertical mixing over the shelf region using hydrographic profiles, indirect turbulent measurements, and internal-tide diagnostics. We examined the stability, water masses, and turbulent kinetic energy dissipation rate (ε) and vertical eddy diffusivity (Kρ) from Thorpe-scale overturns. Internal-tide influence was assessed through M2 ray path modeling and by sampling the M2 tidal envelope at CTD cast times. Results show that the 50-200 m thermocline forms a barrier that suppresses mixing offshore and on the shelf, where Kρ generally remains below 10⁻⁴ m² s⁻¹. Along the slope, weaker stratification at 600-1,000 m supports large overturns and elevated ε (10⁻⁷-10⁻⁸ W kg⁻¹). Ri# indicates weak background shear, while Tu identifies salt-finger–favorable conditions contributing to mid-depth mixing. The spatial alignment between elevated ε and the shifted M2 envelope, consistent with M2 ray path geometry, suggests that internal tides reflected from locally supercritical topography enhance turbulence at the slope. These findings highlight the slope as a focused mixing hotspot. Future work should use moored velocity and high-resolution models to better resolve internal-tide energy pathways and their biogeochemical impacts.
Distribusi Zooplankton Berdasarkan Hambur Balik Acoustic Doppler Current Profiler di Estuari Sungai Musi Heron Surbakti; Riris Aryawati; Isnaini Isnaini; Zwuora Aeesah Oyono; Tengku Zia Ulqodry; I Wayan Nurjaya; Muhammad Ishak Jumarang
Indonesian Journal of Oceanography Vol 8, No 3 (2026): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijoce.v8i3.33467

Abstract

Penelitian ini mengkaji distribusi vertikal dan temporal zooplankton di estuari tropis dangkal menggunakan intensitas gema Acoustic Doppler Current Profiler (ADCP) 492 kHz yang dikonversi menjadi Mean Volume Backscattering Strength (MVBS), divalidasi dengan data zooplankton in situ. ADCP dipasang di dasar perairan selama 17 jam (03:00–20:09 WIB) pada 15 Oktober 2025 di Estuari Sungai Musi, dilengkapi profil CTD per jam dan sampel jaring zooplankton pada tiga lapisan kedalaman. Sebanyak 21 taksa dari 5 filum dan 8 kelas teridentifikasi, dengan Copepoda dominan (56–78%). MVBS berkisar −211 hingga −3 dB (median −153 dB); 332 titik data pada rentang −100 hingga −60 dB diinterpretasikan sebagai hamburan biologis. Lapisan hamburan persisten terdeteksi pada kedalaman 6,5–9 m dengan puncak di 9 m (MVBS ≈ −76 dB) dan intensifikasi pada sore hari, bertepatan dengan kenaikan kelimpahan (2.500–4.000 ind m⁻³) dan keanekaragaman sedang (H' = 1,32–1,74) pukul 18:00–20:00. Korelasi Spearman menunjukkan hubungan positif moderate antara MVBS dan log₁₀ kelimpahan (ρ ≈ 0,57; p < 0,05), bergantung pada lapisan kedalaman. Temuan ini menegaskan hambur balik ADCP terkoreksi hidrografi efektif sebagai proksi distribusi vertikal dan dinamika sub-harian zooplankton, meski sebagai estimator kuantitatif kelimpahan masih dibatasi komposisi komunitas, kedalaman kolom air, dan noise latar estuari.
Co-Authors Abdul Ajiz Siolimbona Abdul Ajiz Siolimbona Abdurrachman Baksir Abdurrachman Baksir Abdurrachman Baksir, Abdurrachman Adi Purwandana Adibrata, Sudirman Adil Mahfudz Firdaus Adil Mahfudz Firdaus Adil Mahfudz Firdaus Agus Atmadipoera Agus Saleh Atmadipoera Agus Sholeh Atmadipoera Ahmad Herison Akmala Dwi Nugraha Alan Frendy Koropitan Alimuddin, Alimuddin Amir Yarkhasy Yuliardi Andhi Setyonugroho Andri Purwandani Ari Purbayanto Ariane Koch-Larrouy Ario Damar Asep Sandra Budiman Asep Sandra Budiman Baharuddin Baharuddin Bambang Kanti Laras Beale, Calvin S. Beginer Subhan Darmiati Dedi Sugianto Denny Alberto Satrya Gumay Derek Soto Dietrich G Bengen Dietriech G. Bengen Dietriech G. Bengen Dietriech Geoffrey Bengen Dondy Arafat Dwiyoga Nugroho Eddy Supriyono Edi Kusmanto Eko S Wibowo Enang Harris Surawidjaja ESTY KURNIAWATI Esty Kurniawati Ety Parwati Ety Parwati Ety Parwati Ety Parwati Ety Parwati fadli syamsudin Fani Safitri Ferawati Runtuboi Ferdy Gustian Firdaus, Adil M. Firdaut Ismail Firdaut Ismail Franto Novico Fredinan Yulianda Hari, Restu Fajar Harpasis S Sanusi Harpasis S Sanusi Harpasis s. Sanusi Hefni Effendi Heron Surbakti Heron Surbakti Hidayat Pawitan Holyness Nurdin Singadimedja HS, Surjono I Gusti Bagus Wiksuana I Made Budiasa I Nyoman Kanca I Wayan Gede Astawa Karang Ida Bagus Made Baskara Andika IG Wayan Adiwilaga Ikbal Marus Indra Jaya Indra Jaya Indra Jaya Indra Jaya Irmalita Tahir Irmalita Tahir, Irmalita Irzal Effendi Ismail, Firdaut Ismudi Muchsin Ismudi Muchsin Isnaini . Iswandi Wahab John I Pariwono Joko Purwanto Joko Santoso Jonson Lumban Gaol Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kadarwan Soewardi Kasman Kasman Khairunnisa Khairunnisa Kholil Kholil Kholil Kholil Krisna Rendi Awalludin Kusnanto La Ode Nurman Mbay Leica Febby Shafitri Leni Maryani Lerma Yuni Siagian Luky Adrianto M. Zairin Junior Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Mahdi Kartasasmita Manalu, Janviter Marimin , Mario Putra Suhana Mennofatria Boer Muh. Ishak Jumarang Muhamad Muliadi Muhammad Agus Muljanto MUHAMMAD AGUS SUPRAYUDI Muhammad Ishak Jumarang Muhammad Marzuki Muhammad Raafi Mulia Purba Mulia Purba Mulia Purba Mursalin Mursalin N Natih, Nyoman Metta N, Furqan Najamuddin N Najamuddin Najamuddin Najamuddin Najamuddin, Najamuddin Nandi Abdul Aziz Nebuchadnezzar Akbar Neviaty P Zamani Neviaty P. Zamani Noor, Hariansyah Nugraha, Teguh Nur Asia Umar Nur Audina Nyoman M N Natih Nyoman M.N Natih Nyoman Metta N Natih Okgareta, Dema Paembonan, Rustam E Paputungan, Mohammad Sumiran Pramudyo Dipo Raismin Kotta Rasidi Rasidi Rastina Ratu Almira Kismawardhani Ratuluhain, Eva Susan Restu, Yunan Gilang Richardus F Kaswadji Richardus F. Kaswadji Ridha Alamsyah Rikardi, Novit Riris Aryawati Risandi Dwirama Putra Rita Rafni Riyadi Subur, Riyadi Robin Saputra Rustam E Paembonan Rustam E Paembonan Rustam Effendi Paembonan Saenudin Sakka Sakka Salnuddin Salnuddin, Salnuddin Salsabila, Unik Hanifah Santi Susanti, Santi Satria Yukiadi Santoso Septy Heltria Setyo Handayani Setyo Handayani Sigid Hariyadi Siolimbona, Abdul Ajiz Siti Rohani Solihin Solihin Soma Somantri Sucantra, Made Bayu Sugeng Budiharso Sugeng Budiharsono Suhaemi Sukenda, Sukenda, Supriyono, Supri Surjono HS Syamsul Bahri Agus, Syamsul Bahri Tengku Zia Ulqodry Tri Hartanto Tri Prartono Tridoyo Kusumastanto Try Al Tanto Try Al Tanto Try Al Tanto Vincentius P Siregar Vincentius Siregar Wahab, Iswandi Wahyu W Pandoe Widodo S. Pranowo Yidoatimojo, Sudibyo Yogi Cahyo Ginanjar Yonvitner - Yudi Setiawan Yuli Naulita Yusli Wardiatno Yusli Wardiatno Zibar, Zan Zulfikar, Andi Zwuora Aeesah Oyono