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Jurnal Kelautan : Indonesian Journal of Marine Science and Technology
Published by Universitas Trunojoyo Madura
ISSN : 19079931     EISSN : 24769991     DOI : -
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This journal encompasses original research articles, review articles, and short communications, including: Marine and fisheries ecology and biology, Marine fisheries, Marine technology, biotechnology, Mariculture, Marine processes and dynamics, Marine conservation, Marine pollution, Marine and coastal resource management, Marine and fisheries processing technology, Salt technology, Marine geology, physical and chemical oceanography.
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Search results for , issue "Vol 18, No 3: Desember (2025)" : 20 Documents clear
Analisis Sebaran Kandungan Klorofil-a Dan Pendugaan Produktivitas Primer Di Perairan Situ Cisanti, Jawa Barat Della Rena Alvetta; Zahidah Hasan; Fittrie Meyllianawaty; Heti Herawati
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.32526

Abstract

ABSTRAKSitu Cisanti merupakan salah satu ekosistem perairan di Provinsi Jawa Barat yang digunakan oleh masyarakat sekitar untuk berbagai aktivitas seperti perkebunan, pertanian, pariwisata, dan perikanan sehingga terjadi penurunan kualitas air di Situ Cisanti. Penelitian ini bertujuan untuk mengetahui sebaran kandungan klorofil-a sebagai penduga produktivitas primer di perairan Situ Cisanti. Penelitian ini dilaksanakan pada bulan Oktober – Desember 2024 menggunakan metode survei dengan teknik pengambilan sampel air dilakukan secara purposive sampling. Untuk analisis sampel menggunakan metode deskriptif komparatif. Parameter kualitas air yang diukur meliputi fisik kimiawi (suhu, kecerahan, pH, DO, CO₂, nitrat, dan fosfat) serta kandungan klorofil-a. Hasil penelitian menunjukkan bahwa konsentrasi klorofil-a di Situ Cisanti berkisar antara 0,019 – 2,603 mg/m³. Rata-rata kandungan klorofil-a paling tinggi terdapat pada stasiun 3 dikarenakan masukan nutrien yang diduga dari limbah domestik dan pertanian. Rata-rata nilai produktivitas primer yang didapat berkisar antara 120,45 hingga 280,32 mgC/m³/hari. Berdasarkan nilai produktivitas primer yang didapat selama riset menunjukan produktivitas primer di Situ Cisanti termasuk rendah, dengan status kesuburan oligotrofik. Kualitas air di Situ Cisanti secara umum memenuhi syarat baku mutu kelas II dan III menurut Peraturan Pemerintah No 22 Tahun 2021 tentang Penyelenggaraan Perlindungan dan Pengelolaan Lingkungan Hidup.Kata Kunci: Kualitas air, Klorofil-A, Produktivitas primer, Situ CisantiABSTRACTSitu Cisanti is one of the aquatic ecosystems in West Java Province that is used by the surrounding community for various activities such as plantations, agriculture, tourism, and fisheries, resulting in a decline in water quality in Situ Cisanti. This study aims to determine the distribution of chlorophyll-a content as an indicator of primary productivity in the waters of Situ Cisanti. This study was conducted from October to December 2024 using a survey method with water sampling techniques carried out using purposive sampling. Descriptive comparative methods were used to analyze the samples. The water quality parameters measured included physical and chemical properties (temperature, brightness, pH, DO, CO₂, nitrate, and phosphate) and chlorophyll-a content. The results showed that the chlorophyll-a concentration in Situ Cisanti ranged from 0,019 to 2,603 mg/m³. The highest average chlorophyll-a content was found at station 3 due to nutrient inputs suspected to be from domestic and agricultural waste. The average primary productivity values obtained ranged from 120,45 to 280,32 mgC/m³/day. Based on the primary productivity values obtained during the research, primary productivity in Situ Cisanti is low, with oligotrophic fertility status. The water quality in Situ Cisanti generally meets the class II and III quality standards according to Government Regulation No. 22 of 2021 concerning the Implementation of Environmental Protection and Management.Keywords: Water quality, Chlorophyll-a, Primary Productivity, Situ Cisanti
Estimasi Cadangan Karbon Lamun Di Pantai Rumaat, Pulau Kei Maluku Tenggara Rosita Silaban; Johny Dobo; Armin Armin; Marisa Rovina Wakole
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.32295

Abstract

ABSTRAKKenaikan karbon menyebabkan terjadinya pemanasan global yang berakibat perubahan iklim berupa fluktuasi curah hujan yang tinggi dan kenaikan muka laut. Lamun menjadi salah satu tumbuhan laut berkemampuan menyerap dan memindahkan jumlah besar karbon dari atmosfir setiap harinya, dan mengendapkannya dalam jaringan atau sedimen untuk waktu yang lama, sehingga keberadaan lamun di bumi sangat diperlukan sebagai jasa dalam penyerapan karbon. Penelitian ini bertujuan mengetahui kerapatan lamun, frekuensi kehadiran, biomasa lamun, cadangan karbon dan parameter lingkungan. Pengambilan sampel menggunakan metode line transek kuadrat. Lamun sebanyak 8 spesies ditemukan pada perairan Rumaat. Kerapatan lamun tertinggi berasal dari spesies Thalassia hemprichii sebanyak 5974 ind/m2. Frekuensi kehadiran Enhalus acoroides sebanyak 93,53% lebih tinggi dibandingkan spesies lainnya. Enhalus acoroides memiliki biomassa tertinggi sebesar 75.871,2 (g/m2) dan didominasi pada bagian bawah substrat. Lamun Enhalus acoroides memiliki total kadar abu 92,38% dan total kandungan organik 220,96% lebih dibanding spesies lainnya serta cenderung tinggi pada bagian bawah substrat. Cadangan karbon lamun di lokasi penelitian cukup tinggi terutama dari spesies Enhalus acoroides sebesar 1,04 ton. Paramater lingkungan di lokasi penelitian diperoleh suhu 32°C, salinitas 30 ‰, pH 8 dan DO 8 mg/l dan dapat dikategorikan cocok bagi pertumbuhan lamun.Kata kunci:  karbon, lamun, rumaatABSTRACTThe increase in carbon causes global warming which results in climate change in the form of high rainfall fluctuations and sea level rise. Seagrass is one of the marine plants that can absorb and transfer large amounts of carbon from the atmosphere every day, and deposit it in tissues or sediments for a long time, so that the existence of seagrass on earth is very necessary as a service in carbon absorption. This research aims to determine seagrass density, frequency of presence, seagrass biomass, carbon reserves and environmental parameters. Sampling used the quadratic line transect method. As many as 8 species of seagrass are found in Rumaat waters. The highest seagrass density came from the Thalassia hemprichii species at 5974 ind/m2. The frequency of presence of Enhalus acoroides was 93.53% higher than other species. Enhalus acoroides had the highest biomass of 75,871.2 (g/m2) and was dominated at the bottom of the substrate. The seagrass Enhalus acoroides has a total ash content of 92.38% and a total organic content of 220.96% more than other species and tends to be high at the bottom of the substrate. Seagrass carbon reserves at the research location are quite high, especially from the Enhalus acoroides species, amounting to 1.04 tonnes. The environmental parameters at the research location were temperature 32°C, salinity 30‰, pH 8 and DO 8 mg/l and could be categorized as suitable for seagrass growth.Keywords: carbon, seagrass, rumaat
Pemetaan Batimetri dan Morfologi Dasar Perairan Sendangbiru, Kabupaten Malang Desy Setyoningrum; Fahreza Okta Setyawan; Riswan Septriayadi Sianturi; Citra Syananta; Siti Al Khumairoh Annadziroh Nurshokh; Decha Satria Ibnu Faqih; Agung Wahyudi Prasetyo; Naufal Fidel Satria Aryasatya
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.28860

Abstract

ABSTRAKPerairan Sendang Biru, Kabupaten Malang, merupakan salah satu jalur pelayaran tersibuk di pesisir selatan Jawa, terutama saat puncak musim penangkapan ikan pada bulan Agustus hingga Oktober. Aktivitas pelayaran dan perikanan intensif di wilayah ini memerlukan data batimetri yang akurat untuk mendukung keselamatan navigasi dan pengelolaan perairan. Penelitian ini bertujuan untuk memetakan kontur batimetri dan mengidentifikasi morfologi dasar laut di Perairan Sendang Biru menggunakan metode pemeruman dengan Single Beam Echosounder (SBES). Pengambilan data dilakukan pada bulan Oktober 2024 dengan interval jalur pemeruman sejauh 50 meter, menghasilkan data kedalaman yang dikoreksi terhadap pasang surut menggunakan Metode Admiralty. Pengolahan data pasang surut dilakukan berdasarkan konstanta harmonik untuk menentukan nilai elevasi penting, seperti HHWL, MHWL, MSL, MLWL, dan LLWL. Hasil analisis menunjukkan tipe pasang surut di Perairan Sendang Biru adalah tipe campuran dominan ganda dengan bilangan Formzahl sebesar 0,31744. Hasil penelitian menunjukkan bahwa kedalaman perairan berkisar antara 1 meter hingga 36 meter. Morfologi dasar laut didominasi oleh lereng landai dengan beberapa area lereng curam yang tersebar di bagian selatan dan barat daya perairan. Selain itu, terdapat beberapa wilayah yang teridentifikasi sebagai potensi pengendapan sedimen di area dangkal. Berdasarkan hasil penelitian ini, memberikan informasi penting bagi penataan alur pelayaran dan area tambat do Pelabuhan Pondokdadap, terutama karena kontur kedalaman yang bervariasi dan keberadaan zona potensi sedimentasi di area dekat pantaiKata kunci: Pemetaan Batimetri; Perairan Sendangbiru; Single Beam Echosounder (SBES); Survey Hidrografi.ABSTRACTThe waters of Sendang Biru, Malang Regency, are among the busiest shipping routes along the southern coast of Java, especially during the peak fishing season from August to October. The intensive shipping and fishing activities in this area require accurate bathymetric data to support navigation safety and water management. This study aims to map bathymetric contours and identify the seabed morphology in the waters of Sendang Biru using a hydrographic survey method with a Single Beam Echosounder (SBES). Data collection was conducted on October  2024, with survey line intervals of 50 meters, producing depth data corrected for tidal variations using the Admiralty Method.Tidal data processing was carried out based on harmonic constants to determine critical elevation values such as HHWL, MHWL, MSL, MLWL, and LLWL. The analysis results indicate that the tidal type in the waters of Sendangbiru is a mixed predominantly semidiurnal type, with a Formzahl number of 0.31744. The study results show that water depths range from 1 meter to 36 meters. The seabed morphology is dominated by gentle slopes with some steep slope areas scattered in the southern and southwestern parts of the waters. Additionally, several areas were identified as potential sediment deposition zones in shallow areas. This findings provide essential information for planning navigation routes and mooring areas at Pondokdadap Port, particularly considering the variable depth contours and presence of sedimen-accumulation zone near the coastline. Keywords: Bathymetric Mapping; Single Beam Echosounder (SBES); Sendang Biru Waters; Hydrographic Survey
Sebaran Suhu Permukaan Laut Di Perairan Selat Ombai Menggunakan Data Citra Satelit Aqua MODIS Gilang Maulana; Raymundus Putra Situmorang; Muhammad Afrizal; Masrurah Ismail; Wanri Sitanggang; Safingi Alamsah; Herning Pramudya; Moh Ramadan Daud
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.31623

Abstract

ABSTRAKSuhu permukaan laut (SPL) adalah salah satu data oseanografi yang dapat berguna dalam memantau perubahan lingkungan yang terjadi di laut. Upaya dalam pemantauan suhu permukaan laut dapat memanfaatkan teknologi pengindraan jauh salah satunya dengan memanfaatkan citra satelit aqua-MODIS. Tujuan dari penelitian ini adalah untuk mengetahui bagaimana sebaran suhu permukaan laut (SPL) di perairan selat ombai provinsi Nusa Tenggara Timur pada tahun 2024. Metode Penelitian yang digunakan adalah dengan memanfaatkan data bulanan suhu permukaan laut (SPL) pada tahun 2024 hasil citra satelit aqua-Modis. Hasil penelitian ini, sebaran suhu permukaan laut tertinggi di selat ombai terjadi pada bulan Juni dengan suhu 33,77°C dan sebaran suhu permukaan laut terendah terjadi pada bulan Juli dengan suhu 26,55 °C dan rata rata suhu bulanan pada tahun 2024 sebesar 29,52°C. Kesimpulan penelitian ini adalah Sebaran Suhu Permukaan Laut di Perairan Selat Ombai Sangat bervariasi karena dipengaruhi faktor iklim dan cuaca serta faktor faktor pendukung lainnya.Kata kunci: Suhu Permukaaan Laut, Selat Ombai, Aqua-MODISABSTRACTSea surface temperature (SST) is one of the oceanographic data that is useful for monitoring environmental changes that occur in the ocean. Efforts to monitor sea surface temperature can utilize remote sensing technology, one of which is by utilizing aqua-MODIS satellite images. The purpose of this study is to find out how the distribution of sea surface temperature (SST) in the waters of the Ombai Strait, East Nusa Tenggara province in 2024. The research method used is to utilize monthly sea surface temperature (SST) data in 2024 from aqua-Modis satellite imagery. As a result of this study, the highest sea surface temperature distribution in the Ombai Strait occurred in June with a temperature of 33.77°C and the lowest sea surface temperature distribution occurred in July with a temperature of 26.55 °C and an average monthly temperature in 2024 of 29.52°C. The conclusion of this study is that the distribution of sea surface temperature in the waters of the Ombai Strait varies greatly because it is influenced by climatic and weather factors and other supporting factors.Keywords: Sea Surface temperature, Ombai Strait, Aqua-MODIS
Karakterisasi Senyawa Bioaktif dan Aktivitas Antioksidan Ekstrak Kasar Caulerpa sp dan Gracilaria sp dari Perairan Bangkalan Madura Umi Nafisatul Qoyyimah; Hafiludin Hafiludin
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.32623

Abstract

ABSTRAKRumput laut pada umumnya dapat dimanfaatkan sebagai sumber pangan dan juga sebagai antioksidan alami. Rumput laut yang berpotensi sebagai bahan aktioksidan alami dari perairan Bangkalan yaitu Caulerpa sp. dan Gracilaria sp. dikarenakan kandungan senyawa bioaktif di dalamnya. Penelitian ini bertujuan untuk mengetahui karakterisasi fisik dan kimia, kandungan senyawa bioaktif serta aktivitas antioksidan dari ekstrak kasar Caulerpa sp. dan Gracilaria sp. Penelitian dilaksanakan di Laboratorium Bioteknologi Laut, Universitas Trunojoyo Madura dengan beberapa tahap yaitu: preparasi sampel, analisa proksimat, analisa fitokimia dan analisis aktivitas antioksidan dengan DPPH. Hasil identifikasi morfologi Caulerpa sp memiliki warna hijau tua dan ramuli kecil seperti anggur. Gracilaria sp. memiliki warna merah kecoklatan dengan percabangan yang tidak teratur seperti akar serabut. Kadar proksimat Caulerpa sp dan Gracilaria sp. menunjukkan tingginya kadar air, abu, dan serat kasar, dibandingkan protein dan lemaknya. Ekstrak kasar rumput laut Caulerpa sp mengandung senyawa bioaktif berupa flavonoid, fenolik, steroid, terpenoid, alkaloid, saponin, dan tannin.  Ekstrak kasar rumput laut Gracilaria sp. senyawa bioaktif yaitu alkaloid, steroid, flavonoid, fenol, saponin, dan terpenoid. Aktivitas antioksidan terbaik terdapat pada ekstrak kasar rumput laut Caulerpa sp. pelarut n-heksan dengan nilai IC50 sebesar 116,41 ppm lebih kuat dibandingkan dengan ekstrak kasar rumput laut Gracilaria sp. Rumput laut dari perairan Bangkalan berpotensi dapat dikembangkan sebagai bahan bahan pangan alami dan antioksidan alami di masa yang akan datang.Kata Kunci: Caulerpa sp, Gracilaria sp, senyawa bioaktif, dan aktivitas antioksidan. ABSTRACTSeaweed in general can be used as a food source and also as a natural antioxidant. Seaweed that has the potential as a natural antioxidant from Bangkalan waters is Caulerpa sp. and Gracilaria sp. due to the content of bioactive compounds in it. This research aims to determine the physical and chemical characteristics, content of bioactive compounds and antioxidant activity of crude extracts of Caulerpa sp. and Gracilaria sp. The research was carried out at the Marine Biotechnology Laboratory, Trunojoyo University, Madura in several stages, namely: sample preparation, proximate analysis, phytochemical analysis and antioxidant activity analysis with DPPH. The results of the morphological identification of Caulerpa sp have a dark green color and small ramuli like grapes. Gracilaria sp. has a brownish red color with irregular branching like fibrous roots. Proximate levels of Caulerpa sp and Gracilaria sp. shows high levels of water, ash and crude fiber, compared to protein and fat. Caulerpa sp seaweed crude extract contains bioactive compounds in the form of flavonoids, phenolics, steroids, terpenoids, alkaloids, saponins and tannins. Crude extract of seaweed Gracilaria sp. Bioactive compounds are alkaloids, steroids, flavonoids, phenols, saponins and terpenoids. The best antioxidant activity is found in the crude extract of seaweed Caulerpa sp. with n-hexane solvent was an IC50 value of 116.41 ppm is stronger than the crude extract of seaweed Gracilaria sp. Seaweed from Bangkalan seawaters has the potential to be developed as a natural food ingredient and natural antioxidant in the future.Keywords: Caulerpa sp, Gracilaria sp, bioactive compounds, and antioxidant activity.
Analisis Potensi Hutan Mangrove Sebagai Ekowisata Berkelanjutan Untuk Peningkatan Ekonomi Masyarakat Pesisir Desa Nelayan Seberang, Medan Belawan Aulia Putra Daulay; A'ung Ezra Al'fatah; Hanna Tresia Silalahi
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.32191

Abstract

ABSTRAKEkosistem mangrove memiliki tingkat produktivitas yang tinggi yang memiliki banyak fungsi yang penting diantaranya fungsi ekonomi, sosial, dan lingkungan. Fungsi ekonomi dari hutan mangrove dimanfaatkan oleh masyarakat lokal dalam ekowisata mangrove. Ekowisata merupakan model bagi pengembangan pariwisata berkelanjutan, dalam model pariwisata bagi pemerintah daerah dan masyarakat setempat, ekowisata juga berperan tidak hanya memiliki manfaat ekonomi tetapi memiliki manfaat ekologis dan sosial. Oleh sebab itu, tujuan penelitian ini adalah menganalisis potensi dan manfaat hutan mangrove sebagai ekowisata mangrove dalam meningkatkan perekonomian masyarakat lokal. Peneilitian dimulai dengan mengambil data jenis dan jumlah individu, kerapatan jenis, data pasang surut air laut yang dikumpulkan melalui pengambilan data langsung di lokasi penelitian. Informasi lokal, peta, dan dokumen yang berkaitan dengan kondisi penelitian dan hutan mangrove yang diperoleh melalui pengelola hutan mangrove. Selanjutnya, melakukan pengamatan kerapatan jenis, kerapatan relative jenis, frekwensi relative jenis, dominansi relative jenis, dan indeks keragaman jenis. Terakhir, melakukan analisis parameter kesesuaian ekowisata, dan analisis SWOT. Hasil dalam penelitian didapat sebanyak 11 jenis dengan total sebanyak 330 individu. Individu yang banyak di jumpai yaitu jenis Avicennia alba dengan nilai INP sebesar 89,25. Nilai IKW yang didapat sebesar 96,05 dengan kategori S1 (sangat sesuai) untuk ekowisata. Hutan mangrove di Desa Nelayan Seberang termasuk kedalam sesuai untuk ekowisata dengan beberapa analisis SWOT yang digunakan salah satunya dengan promosi melalui media sosial dan dukungan dari pemerintah dalam membangun fasilitas serta perkembangan dalam ekowisata mangrove. Kata Kunci: Analisis, Ekonomi, Ekowisata, Mangrove, MasyarakatABSTRACTMangrove ecosystems have high productivity and serve many important functions, including economic, social, and environmental functions. The economic function of mangrove forests is utilized by local communities in mangrove ecotourism. Ecotourism is a model for sustainable tourism development. In the tourism model for local governments and communities, ecotourism not only has economic benefits but also ecological and social benefits. Therefore, the purpose of this study is to analyze the potential and benefits of mangrove forests as mangrove ecotourism in improving the local community's economy. The study began by collecting data on species and number of individuals, species density, and tidal data, which was collected through direct data collection at the study site. Local information, maps, and documents related to the research conditions and mangrove forests were obtained from the mangrove forest managers. Next, observations were made on species density, relative species density, relative species frequency, relative species dominance, and species diversity index. Finally, an analysis of ecotourism suitability parameters and a SWOT analysis were conducted. The results of the study found 11 species with a total of 330 individuals. The most commonly found individual was the Avicennia alba species with an INP value of 89.25. The IKW value obtained was 96.05 with a category of S1 (very suitable) for ecotourism. The mangrove forest in Nelayan Seberang Village is suitable for ecotourism based on several SWOT analyses, one of which is promotion through social media and government support in building facilities and developing mangrove ecotourism.Keywords: Analysis, Community, Economy, Ecotourism, Mangrove
Evaluasi Habitat Peneluran Penyu Pada Tiga Kawasan Konservasi Penyu Di Sumatera Barat Farah Deshan Pasokawati; Meuthia Aula Jabbar; Toni Ruchimat; Basuki Rachmad; Yuwanda Ilham; Yendri Yendri
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.32395

Abstract

ABSTRAKPenelitian ini bertujuan untuk mengevaluasi karakteristik habitat pendaratan dan keberhasilan penetasan telur penyu di tiga kawasan konservasi penyu di Sumatera Barat, yaitu Pulau Pandan, Pulau Karabak Ketek, dan Ampiang Parak. Pengumpulan data dilakukan dengan pendekatan berbeda pada masing-masing lokasi, menyesuaikan kondisi ekologi dan akses lapangan. Pengamatan primer dilakukan di Pulau Pandan karena aktivitas pendaratan penyu masih terjadi dan lokasi dapat dijangkau selama penelitian. Sementara itu, pengumpulan data primer tidak dapat dilakukan di Pulau Karabak Ketek akibat kondisi gelombang tinggi, dan di Ampiang Parak tidak ditemukan penyu yang mendarat karena abrasi yang menyebabkan kemiringan pantai menjadi curam. Oleh karena itu, data pada kedua lokasi tersebut diperoleh melalui data sekunder dari laporan monitoring pengelola kawasan. Hasil penelitian menunjukkan bahwa Pulau Pandan memiliki tujuh sarang aktif (satu sarang alami dan enam semi-alami), sedangkan informasi dari Karabak Ketek dan Ampiang Parak diperoleh melalui monitoring tahunan pengelola. Variasi keberhasilan penetasan di Pulau Pandan (11-98%) berasal dari sarang bulan Januari-Desember 2024, sedangkan nilai 54-99% pada Karabak Ketek dan 73-100% pada Ampiang Parak merupakan rekapitulasi sarang semi-alami yang dikelola sepanjang tahun. Hasil penelitian menunjukkan bahwa Pulau Pandan masih memiliki habitat yang sesuai untuk peneluran, sementara dua lokasi lain menunjukkan penurunan fungsi habitat akibat abrasi dan gelombang tinggi. Penelitian ini merupakan evaluasi komparatif terbaru yang memadukan data primer dan monitoring tahunan untuk melihat pergeseran fungsi habitat penyu di Sumatera Barat.Kata Kunci: habitat peneluran, konservasi, penyu lautABSTRACTThe study aims to evaluate sea turtle nesting habitat characteristics and hatching success in three conservation areas in West Sumatera: Pandan Island, Karabak Ketek, and Ampiang Parak. Data collection methods differed among locations based on ecological conditions and field accessibility. Primary observations were conducted on Pandan Island, where active nesting was still occurring and field access was feasible. In contrast, primary data collection could not be conducted on Karabak Ketek Island due to high wave conditions, and no nesting activity was observed at Ampiang Parak due to coastal abrasion that caused steep beach slopes. Therefore, data from Karabak Ketek and Ampiang Parak were obtained from secondary monitoring records maintained by conservation staff. The findings show that Pulau Pandan recorded seven active nests (one natural nest and six semi-natural nests), while information from Karabak Ketek and Ampiang Parak was sourced from annual monitoring records. The variation in hatching success on Pandan Island (11-98%) represents nest outcomes recorded from January to December 2024, whereas the 54-99% range in Karabak Ketek and the 73-100% range in Ampiang Parak reflect semi-natural hatchery results managed throughout the monitoring year. Overall, the analysis indicates that Pandan Island still maintains suitable ecological conditions for natural nesting, while the other two locations have experienced a decline in habitat function due to abrasion and high wave exposure. This study presents the most recent comparative evaluations integrating primary field observations with annual monitoring data to identify shifts in sea turtle nesting habitat functionality in West Sumatera.Keywords: nesting habitat, conservation, sea turtle
Ecological Pressures In Pusong Harbour: Integrated Assessment Of Water Quality, Nutrient Enrichment, And Pollution Index Cut Meurah Nurul 'Akla; Malik Pajar Lubis; Erniati Erniati; Rian Firdaus; Imamshadiqin Imamshadiqin; Imanullah Imanullah
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.31725

Abstract

ABSTRACTPusong Harbor in Lhokseumawe City doubles as a center for fisheries activities as well as a habitat for marine biota, making it vulnerable to pollution pressure from anthropogenic activities. This study aims to assess water quality through the analysis of physico-chemical parameters, nutrient content (nitrate and phosphate), pollution index, and spatial variation patterns using a multivariate approach. Measurements were taken at three stations representing the locations of boat moorings, settlements, and fish farms. The measurement results showed that basic parameters such as salinity (32-33‰), pH (7.5-8.0), dissolved oxygen (5.8-6.3 mg/L), and BOD (1.6-3.6 mg/L) were still within the quality standard range, but the brightness level was low (0.8-0.9 m) and the phosphate concentration was very high (7.2-10.1 mg/L), exceeding the quality standard by hundreds of times. The pollution index based on the harbor quality standard showed a Slightly polluted (PI = 1.09-1.11), but based on the marine biota quality standard it was classified as "heavily polluted" (PI = 10.3-10.9). PCA analysis identified phosphate and BOD as the dominant factors differentiating water quality, while temperature, salinity and DO were more reflective of natural conditions. Cluster analysis showed that stations 1 and 3 were similar, while station 2 differed significantly due to local pressures. This finding confirms the serious ecological pressures in the harbor area, especially due to excessive nutrient loads, and calls for pollutant control strategies and continuous monitoring to maintain the sustainability of coastal ecosystems. The study highlights the urgent need to address nutrient-driven pollution in Pusong Harbor, where phosphate concentrations exceed marine biota standards by hundreds of times despite most basic water parameters remaining within acceptable limits. This excessive nutrient load poses a serious threat of eutrophication, habitat degradation, and loss of biodiversity in a harbor that supports both fisheries activities and critical marine life. By integrating physico-chemical measurements, nutrient analysis, and multivariate statistics, the research identifies phosphate and BOD as key pollution drivers and reveals spatial variation linked to human activities. These findings provide evidence-based guidance for local management and policy, calling for targeted pollutant control and continuous monitoring to protect coastal ecosystems. The multivariate framework also offers a replicable approach for similar small-harbor environments across Southeast Asia.Keywords: water quality, pollution index, PCA, cluster, nutrients, Pusong Harbour
Comparative Performance Evaluation Of Machine Learning Algorithms For Sentinel-2 Benthic Habitat Classification Using Google Earth Engine Adhitya Nugroho; Muhammad Abdul Ghofur Al Hakim
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.32389

Abstract

This study evaluates the optimal classification methodology and analyzes temporal changes over five years across four benthic habitat classes (Seagrass, Coral Reef, Rubble, and Sand) in the shallow waters of Ohoidertawun, Southeast Maluku, using Sentinel-2 imagery and the Google Earth Engine (GEE) platform. A comparative assessment of Machine Learning (ML) algorithms revealed that Random Forest (RF) demonstrated the best classification performance compared to Support Vector Machine (SVM), Classification and Regression Tree (CART), K-Nearest Neighbors (KNN), and Minimum Distance (MD) in benthic habitat mapping, achieving an Overall Accuracy of 0.856 and a Kappa Coefficient of 0.870. The classification results and accuracy assessment using the best-performing ML model from the 2025 Sentinel-2 imagery were used to analyze temporal changes relative to the 2020 Sentinel-2 data. Temporal analysis indicated a significant ecosystem shift, marked by a 52.41% increase in seagrass cover and a 31.46% decrease in coral reef area. These findings can serve as a recommendation for conservation site selection and urge stakeholders to help mitigate coral reef loss by utilizing the results of this research. The resulting benthic habitat map can serve as a reference for effective coastal resource management and blue carbon initiatives. Based on these findings, the Random Forest ML algorithm can be considered an optimal methodology for tropical benthic habitat mapping in the study area.Keywords: Benthic Habitat, Sentinel-2, Machine Learning, Google Earth Engine
Evaluasi Komponen Harmonik Pasang Surut Dengan Data Altimetri Pesisir Dan Tide Gauge Di Pesisir Barat Daya Sumatera Devianti Natalia Lase; Zulfikar Adlan Nadzir
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.25780

Abstract

ABSTRAKPerkembangan teknologi akuisisi data menghasilkan alternatif dalam pengamatan pasang surut (pasut) selain menggunakan stasiun lapangan (tide gauge) yaitu satelit altimetri. Peningkatan ketelitian dari sistem retracker di pesisir menjadi parameter untuk meninjau tingkat kebaikan penggunaan satelit altimetri dalam pengamatan pasut sebagai pelengkap data tide gauge. Penelitian ini melakukan analisis harmonik dengan metode least square, menghasilkan nilai konstituen pasut utama yang digunakan dalam analisis kesesuaian data altimetri dibanding dengan tide gauge. Menggunakan dua stasiun di barat daya Sumatera, stasiun Krui menghasilkan amplitudo konstituen dominan K2 sebesar 0,034 m dan stasiun pasut Seblat dengan konstituen dominan K1 sebesar 0,035 m. Data altimetri Jason-1, Jason-2 dan Jason-3 pada pass 153 untuk data ALES dan GDR menghasilkan komponen pasut dominan P1 sebesar 0,283 m dan 0,354 m. Pass 077 data ALES dan GDR menghasilkan komponen pasut dominan P1 sebesar 0,532 m dan 0,313 m. Hasil analisis kesesuaian data antara satelit altimetri dan stasiun pasang surut diperoleh bahwa data ALES lebih baik di pesisir dengan jarak 10 km dari garis pantai. Sedangkan data GDR lebih baik untuk pesisir berjarak 10 km dari garis pantai. Disamping itu, apabila pengamatan dilakukan pada jarak yang lebih besar dari pesisir dapat menggunakan kombinasi dari kedua data tersebut.Kata Kunci: analisis harmonik, muka air laut, pesisir, satelit altimetri, stasiun pasutABSTRACTThe advancement of data acquisition technology has provided alternatives to tide gauge observations for sea-level monitoring, namely satellite altimetry. The accuracy improvement of retracking systems in coastal regions is a key parameter for evaluating the effectiveness of satellite altimetry as a complement to tide gauge data. This study applied harmonic analysis using the least squares method to obtain tidal constituents, which were then used to assess the consistency of altimetry data compared with tide gauges. Two tide gauge stations on the west coast of Sumatra were analyzed: Krui, where the dominant tidal constituent was K2 with an amplitude of 0.034 m, and Seblat, where the dominant constituent was K1 with an amplitude of 0.035 m. Altimetry data from Jason-1, Jason-2, and Jason-3 along pass 153 produced dominant P1 constituent with an amplitudes of 0.283 m (ALES) and 0.354 m (GDR), while pass 077 yielded P1 with amplitudes of 0.532 m (ALES) and 0.313 m (GDR). The results indicate that ALES data are more reliable within 10 km of the coastline, whereas GDR data perform better beyond 10 km. Furthermore, a combination of both datasets is recommended for improved tidal representation in the coastal zone of West Sumatra.Keywords: altimetry satellite, coastal zone, harmonic analysis, sea level, tide gauge

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