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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 2: Agustus (2025)" : 10 Documents clear
Analisis Keberlanjutan Pengelolaan Kawasan Konservasi Penyu Di Pesisir Pangandaran, Jawa Barat Oktavianti, Lestari; Pamungkas, Wahyuniar; MS, Yuniarti; Yuliadi, Lintang Permata Sari
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.31230

Abstract

ABSTRAKPenyu merupakan salah satu reptil laut yang kini keberadaannya terancam punah. Kawasan konservasi penyu memiliki peran penting dalam menjaga keberlangsungan penyu. Konservasi penyu yang terdapat di Pangandaran, diantaranya berada di pesisir pantai Batu Hiu dan Legokjawa. Pengelolaan kawasan konservasi tersebut dinilai masih kurang optimal, sehingga diperlukan perbaikan pengelolaan agar dapat berjalan secara berkelanjutan. Penelitian ini bertujuan untuk menganalisis status keberlanjutan pengelolaan konservasi penyu di Pantai Batu Hiu dan Legok Jawa, Kabupaten Pangandaran ditinjau dari dimensi ekologi, ekonomi, sosial, kelembagaan, dan infrastruktur. Metode analisis yang digunakan dalam penelitian ini adalah Multidimensional Scaling (MDS) dengan bantuan Rapfish. Hasil analisis menunjukkan bahwa status keberlanjutan konservasi penyu di Batu Hiu dan Legok Jawa berada pada kategori cukup berkelanjutan dengan nilai indeks masing-masing sebesar 62,43% dan 56,35%. Seluruh dimensi yang dianalisis menunjukkan status keberlanjutan dengan kategori cukup berkelanjutan. Di kawasan konservasi Batu Hiu, dimensi infrastruktur memiliki nilai tertinggi sebesar 73,36%, sedangkan dimensi ekologi memperoleh nilai terendah 53,93%, kemudian dimensi sosial memperoleh nilai 71,44%, ekonomi 55,53%, dan kelembagaan 57,92%, Sementara pada konservasi Legok Jawa, dimensi ekologi memiliki nilai tertinggi sebesar 65,61%, sedangkan dimensi ekonomi memiliki nilai terendah 51,54%. Kemudian dimensi lainnya, yaitu dimensi sosial memiliki nilai 54,61%, dimensi kelembagaan 54,58%, dan dimensi infrastruktur 55,41%. Kata Kunci: Konservasi Penyu, Keberlanjutan, MDS, PengelolaanABSTRACTSea turtles are one of the marine reptiles that are now threatened with extinction. Sea turtle conservation areas play an important role in ensuring the survival of sea turtles. Sea turtle conservation areas in Pangandaran include those located on the coast of Batu Hiu and Legokjawa. The management of these conservation areas is considered to be less than optimal, so improvements are needed to ensure sustainable management. This study aims to analyze the sustainability status of sea turtle conservation management at Batu Hiu and Legok Jawa beaches in Pangandaran District, focusing on ecological, economic, social, institutional, and infrastructure dimensions. The analysis method used in this study is Multidimensional Scaling (MDS) with the assistance of Rapfish. The analysis results indicate that the sustainability status of sea turtle conservation at Batu Hiu and Legok Jawa falls into the moderately sustainable category, with index values of 62.43% and 56.35%, respectively. All analyzed dimensions show a moderately sustainable status. At the Batu Hiu conservation area, the infrastructure dimension has the highest value at 73.36%, while the ecological dimension had the lowest value of 53.93%, followed by the social dimension with a value of 71.44%, the economic dimension with 55.53%, and the institutional dimension with 57.92%. Meanwhile, in the Legok Jawa conservation area, the ecological dimension had the highest value of 65.61%, while the economic dimension had the lowest value of 51.54%. The other dimensions are as follows: the social dimension has a value of 54.61%, the institutional dimension 54.58%, and the infrastructure dimension 55.41%. Keywords: Sea Turtle Conservation, Sustainability, MDS, Management
Keanekaragaman Lamun dan Echinodermata Sebagai Indikator Kondisi Perairan Rumaat, Maluku Tenggara Silaban, Rosita; Dobo, Johny; Silubun, Dortje Theodora; Awayal, Dion Dollan; kilmanun, Anthon Daud
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.29587

Abstract

ABSTRAKEchinodermata merupakan salah satu hewan yang sangat penting dalam ekosistem laut dan bermanfaat sebagai salah satu komponen dalam rantai makanan, pemakan sampah organik dan hewan kecil lainnya. Echinodermata merupakan hewan avertebrata yang hanya dapat hidup di perairan laut dengan berbagai tipe habitat, salah satunya adalah padang lamun. Padang lamun yang begitu luas memungkinkan banyaknya biota yang hidup berasosiasi dengan lamun seperti alga, Moluska, Crustacea, mamalia, ikan dan Echinodermata. Tujuan penelitian ini yaitu mengetahui kerapatan lamun, kepadatan Echinodermata, indeks ekologi serta hubungan kerapatan lamun dan kepadatan Echinodermata. Komposisi jenis lamun diperoleh 8 spesies dan Echinodermata sebanyak 9 spesies di perairan Rumaat. Lamun perairan Rumaat menunjukan kondisi tumbuh sangat rapat dengan kerapatan tertinggi spesies Thalassia hemprichii. Kepadatan Echinodermata tertinggi dari spesies Holothuria atra. Keanekaragaman lamun dan Echinodermata dikategorikan sedang yang menunjukan kondisi stabil. Kesergaman lamun dan Echinodermata tergolong sedang menunjukan tidak adanya tekanan dari faktor lingkungan. Indeks dominansi yang rendah menunjukkan bahwa di lokasi ini tidak ada spesies yang mendominasi. Hasil uji regresi kerapatan lamun dan kepadatan Echinodermata tidak memiliki pengaruh yang nyata.Kata kunci:  keanekaragaman, lamun, Echinodermata, RumaatABSTRACTEchinoderms is are one of the most important animals in the marine ecosystem and is useful as one of the components in the food chain, eating organic waste and other small animals. Echinoderms and are invertebrate animal that can only live in sea waters with various types of habitats, one of which is seagrass beds. The vast seagrass beds allow many organism to live in association with seagrass including algae, Molluscs, Crustacea, mammals, fish and Echinoderms. The purpose of this study was to determine the density of seagrass, the density of Echinoderms, the ecological index and the relationship between seagrass density and Echinoderms density. The composition of seagrass species obtained 8 species and Echinoderms as many as 9 species in the Rumaat waters. Seagrass in the Rumaat waters showed very dense growth conditions with the highest density of the Thalassia hemprichii species. The highest density of Echinoderms from the Holothuria atra species. The diversity of seagrass and Echinoderms is categorized as moderate indicating a stable condition. The uniformity of seagrass and Echinoderms is classified as moderate indicating no pressure from environmental factors. The low dominance index indicates that there is no dominant species in this location. The results of the regression test of seagrass density and Echinoderms density have no significant effect.Keywords: diversity, seagrass, Echinoderms, Rumaat
Studi Karakteristik Massa Air Pada Lapisan Termoklin Di Selat Makassar Supriyanto, Taufiq; Apriyanto, I Nengah Putra; Irwanto, Bambang; Adriyanto, Agus; Purwanto, Budi; Agustinus, Agustinus; Pranowo, Widodo S
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.29829

Abstract

ABSTRAKSelat Makassar merupakan jalur strategis antara Kalimantan dan Sulawesi yang menghubungkan Samudera Pasifik dan Samudera Hindia. Selain menjadi rute pelayaran internasional penting, wilayah ini juga rawan terhadap ancaman keamanan seperti ranjau laut dan drone bawah air, sehingga membutuhkan pengawasan ketat dan kerja sama lintas sektor. Penelitian ini bertujuan untuk mengeksplorasi karakteristik kolom air, khususnya lapisan termoklin yang berpotensi menjadi wilayah persembunyian (Shadowzone), pada kedalaman 0–300 meter di choke point Selat Makassar. Data suhu dan salinitas terhadap kedalaman diperoleh dari pengukuran argo float selama periode Oktober 2017 hingga Januari 2018. Perhitungan kecepatan rambat suara dilakukan menggunakan persamaan empiris Medwin. Lapisan termoklin diidentifikasi melalui gradien suhu sebesar 0,1°C per meter. Visualisasi dan analisis data dilakukan menggunakan perangkat lunak ODV 5.6.2. Hasil penelitian menunjukkan bahwa lapisan termoklin berada pada kedalaman 86,4–158,1 meter, dengan suhu 16,79–27,98°C, salinitas 33,75–34,67‰, dan kecepatan suara 1514,19–1541,95 m/s. Ketebalan lapisan sekitar 72 meter ini diindikasikan sebagai Shadowzone yang potensial menjadi lokasi persembunyian objek bawah laut.Kata Kunci: Selat Makassar, Lapisan termoklin, Suhu, Salinitas, Kecepatan SuaraABSTRACTThe Makassar Strait is a strategic route between Kalimantan and Sulawesi that connects the Pacific Ocean and the Indian Ocean. In addition to being an important international shipping route, this area is also prone to security threats such as sea mines and underwater drones, requiring strict surveillance and cross-sector cooperation. This study aims to explore the characteristics of the water column, particularly the thermocline layer that has the potential to become a hiding place (Shadowzone), at a depth of 0–300 metres at the Makassar Strait choke point. Temperature and salinity data at different depths were obtained from argofloat measurements during the period from October 2017 to January 2018. Sound propagation velocity calculations were performed using the Medwin empirical equation. The thermocline layer was identified through a temperature gradient of 0.1°C per metre. Data visualisation and analysis were conducted using ODV 5.6.2 software. The results of the study show that the thermocline layer is located at a depth of 86.4–158.1 metres, with a temperature of 16.79–27.98°C, salinity of 33.75–34.67‰, and sound velocity of 1514.19–1541.95 m/s. The thickness of this layer, approximately 72 metres, is indicated as a potential shadow zone for the hiding of underwater objects.Keywords: Makassar Strait, Thermocline Layer, Temperature, Salinity, Sound Velocity 
Analisis Hubungan Antara Suhu Permukaan Laut Dengan Hasil Tangkapan Ikan di Teluk Ciletuh, Kabupaten Sukabumi Suryapratama, Ralvikrana Bobby; MS, Yuniarti.; Subiyanto, Subiyanto; Ismail, Mochamad Rudyansyah
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.30742

Abstract

ABSTRAKPotensi di Teluk Ciletuh menjadi perhatian besar baik dari segi pemerintahan maupun masyarakat pesisir dalam peningkatan ekonomi biru hingga industri kreatif pariwisata. Berdasarkan data tangkapan ikan dari Dinas Perikanan Kabupaten Sukabumi dan Kantor Tempat Pelelangan Ikan di Teluk Ciletuh, hasil tangkapan ikan sejak 2019 hingga 2023 mengalami fluktuasi yang lebih rendah jika dibandingkan dengan hasil tangkapan ikan di Teluk Genteng dan Palabuhanratu. Penelitian ini akan berfokus pada uji korelasi statistik untuk mengetahui seberapa besar korelasi antara suhu permukaan laut dengan hasil tangkapan ikan di Teluk Ciletuh, Kabupaten Sukabumi. Metode penelitian meliputi pengumpulan data sekunder dengan citra satelit Sentinel-3, visualisasi data, uji normalitas, dan uji statistik yang menggunakan statistik inferensial yaitu uji korelasi. Hasil dari penelitian menunjukkan bahwa nilai distribusi data pada setiap jenis ikan yaitu terdapat 11 jenis ikan bernilai distribusi normal, dan 15 jenis ikan berdistribusi tidak normal. Hasil uji korelasi antara suhu permukaan laut dengan hasil tangkapan ikan di Teluk Ciletuh menunjukkan bahwa hanya 5 dari 26 jenis ikan yang berkorelasi dan signifikan  0.05 secara statistik.Kata kunci: Hasil Tangkapan Ikan, Uji Korelasi, Uji Normalitas, Suhu Permukaan LautABSTRACTThe potential of Ciletuh Bay is of great concern both in terms of government and coastal communities in improving the blue economy to the creative tourism industry. Based on fish catch data from the Sukabumi Regency Fisheries Service and the Fish Auction Office in Ciletuh Bay, fish catches from 2019 to 2023 experienced lower fluctuations when compared to fish catches in Genteng Bay and Palabuhanratu. This research will focus on statistical correlation test to determine how much correlation between sea surface temperature and fish catch in Ciletuh Bay, Sukabumi Regency. The research method includes secondary data collection with Sentinel-3 satellite imagery, data visualization, normality test, and statistical test using inferential statistics, namely correlation test. The results of the study showed that the value of data distribution in each type of fish is that there are 11 types of fish with normal distribution, and 15 types of fish with abnormal distribution. The results of the correlation test between sea surface temperature and fish catch in Ciletuh Bay showed that only 5 out of 26 fish species were correlated and statistically significant  0.05.Keywords: Fish Catch, Correlation Test, Normality Test, Sea Surface Temperature
Rancang Bangun Alat Ukur Potensi Gelombang Laut Dengan Metode Superposisi Gelombang Kahfi, Ahmad Khairul; Arini, Nu Rhahida; Sesulihatien, Wahjoe Tjatur
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.30124

Abstract

ABSTRACTBanyak perangkat maritim, seperti sistem navigasi kapal dan Pembangkit Listrik Tenaga Gelombang Laut (PLTGL), sangat bergantung pada data karakteristik gelombang laut. Beberapa alat ukur karakteristik gelombang laut telah dijual di pasaran, namun tidak terjangkau dan sulit dioperasikan. Penelitian ini bertujuan untuk merancang dan membangun alat ukur ketinggian gelombang laut berbasis pengolahan sinyal menggunakan metode Fast Fourier Transform (FFT) dan prinsip superposisi. Sistem pengukuran menggunakan sensor Inertial Measurement Unit (IMU) yang merekam data percepatan secara real-time. Data tersebut kemudian dianalisis untuk mengekstrak parameter utama gelombang, termasuk tinggi gelombang, frekuensi, dan kecepatan rambat gelombang. Eksperimen dilakukan di fasilitas wave generator selama 5 menit dengan frekuensi pengambilan data sebesar 25 Hz. Hasil eksperimen menunjukkan kondisi gelombang uji pada frekuensi motor 25 Hz mempunyai tinggi gelombang air sebesar 1 cm. Hasil pengukuran dibandingkan dengan pengukuruan/pengamatan visual di kolom wave generator menunjukkan perbedaan pengukuran sebesar 2% dengan frekuensi dominan yang didapatkan berada di 3,2 Hz yang didapatkan dari amplitudo dominan di sinyal domain waktu. Studi ini diharapkan dapat berkontribusi dalam perkembangan teknologi maritim dalam mendukung sektor pelayaran dan energi terbarukan berbasis kelautan di Indonesia.Kata Kunci: Ketinggian Gelombang, FFT, Gelombang Superposisi, Karakteristik Gelombang, Sensor IMU.ABSTRAKMany maritime devices, such as ship navigation systems and Wave Ocean Power Plants, rely heavily on data on ocean wave characteristics. Several water wave characteristic measuring instruments have been sold on the market, but not affordable and difficult to operate. The aim of this study is to design and build a wave height measuring instrument based on signal processing using the Fast Fourier Transform (FFT) method and the superposition wave. The measurement system uses an Inertial Measurement Unit (IMU) sensor that records acceleration data in real time. The data is analyzed to extract the main parameters of the wave, including wave height, frequency, and wave propagation speed. The experiment is conducted at the wave generator facility for 5 minutes with a data collection frequency of 25 Hz. The results of the experiment show that the test wave conditions at a motor frequency of 25 Hz had a water wave height of 1 cm. The measurement results compared with the visual measurement/observation in the wave generator column show a measurement difference of 2%, with the dominant frequency obtained being 3.2 Hz, derived from the dominant amplitude in the time domain signal. This study is expected to contribute to the development of maritime technology in supporting the shipping and marine-based renewable energy sectors in Indonesia.Keywords: FFT, IMU Sensor, Superposition Wave, Wave Characteristic, Wave Height
Identifikasi Holothuria atra pada Ekosistem Lamun di Pulau Cemara Kecil Taman Nasional Karimunjawa Istiqomah, Ayu; Suryanti, Suryanti; Muskananfola, Max Rudolf; Nisak, Yuyun Khoirun
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.22492

Abstract

ABSTRAKEchinodermata termasuk komponen keanekaragaman hayati yang berperan penting dalam ekosistem. Penelitian ini bertujuan untuk mengetahui morfologi, anatomi, habitat, serta hubungan antara faktor fisika kimia perairan terhadap jumlah Holothuria atra di perairan Pulau Cemara Kecil Taman Nasional Karimunjawa. Metode dalam penelitian ini yaitu metode observasi dengan analisis statistik kuantitatif. Metode observasi merupakan metode yang digunakan untuk menganalisis sampel di lapangan serta di laboratorium. Penentuan stasiun secara systematic random sampling dengan mempertimbangkan keberadaan ekosistem padang lamun sebagai habitat utama teripang. Sampel teripang diidentifikasi dan sampel sedimen dilakukan analisis butir sedimen. Analisis kuantitatif dilakukan guna mengetahui pengaruh tutupan lamun terhadap kelimpahan teripang. Hasil penelitian menunjukkan bahwa ditemukan spesies Holothuria atra dengan tubuh berbentuk bulat dengan warna hitam terdiri atas mulut, tentakel, faring, esofagus, stomach, usus, gonad, cloaca, dan anus. Berat tubuh teripang yang ditemukan yaitu 192 - 411 gram, panjang tubuh 17 - 23 cm, lebar badan 4 - 7,6 cm, dan panjang ususnya 68,58 - 78,8 cm. Habitat dari teripang Holothuria atra berupa sedimen berpasir kasar (0,5 mm) yaitu sebesar 54 % dan pasir halus (0,125 mm) 44,9%. Hubungan antara kelimpahan teripang dengan nilai tutupan lamun didapatkan nilai koefisien determinasi sebesar 0,024 termasuk kategori lemah dan koefisien korelasi sebesar 0,15 termasuk kategori sangat lemah. Sedangkan parameter kualitas air optimal untuk pertumbuhan teripang dan lamun.Kata kunci: Echinodermata,  Holothuria atra,  Kelimpahan, Lamun, Teripang.ABSTRACTEchinoderms are one of components of marine biodiversity that play an important role in ecosystem function.This study aims to determine the morphology, anatomy, habitat, and relationship between physical, chemical factors in the waters and the number of Holothuria atra Cemara Kecil Island, Karimunjawa National Park. The method in this study is the observation method with quantitative statistical analysis. The observation method is a method used to analyze samples in the field and in the laboratory. Determination of stations by systematic random sampling by considering the the existence of seagrass ecosystems as the main habitat of sea cucumbers. Sea cucumber samples were identified and sediment samples were analyzed for sediment grains. Quantitative analysis was conducted to determine of seagrass cover influence on sea cucumber abundance.The results showed that the species Holothuria atra was found with a round body with a black color consisting of a mouth, tentacles, pharynx, esophagus, stomach, intestines, gonads, cloaca and anus. The body weight 192-411 grams, body length of 17-23 cm, body width 4-7.6 cm, and intestine length in the range of 68.58-78.8 cm. The habitat of the sea cucumber Holothuria atra is coarse sand (0.5 mm) sediment which is equal to 54% and fine sand (0.125 mm) 44.9%. The relationship between revealing sea cucumbers and the seagrass cover value obtained a determination coefficient value of 0.024 including the weak category and a correlation coefficient of 0.15 including the very weak category. Meanwhile, air quality parameters are optimal for the growth of sea cucumbers and seagrass.Keywords: Abundance; Echinodermata, Holothuria atra, Seagrass, Sea Cucumber.
Potensi Antifouling Ekstrak Teripang (Phyllophorus sp.) Terhadap Bakteri Biofilm Di Beton Perairan Jembatan Suramadu Arnanda, Nisya; Maisaroh, Dian Sari; Perdanawati, Rizqi Abdi
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.27332

Abstract

ABSTRAKPenempelan biota pada permukaan beton diawali dengan tahapan penempelan koloni bakteri dan mikroalga (biofilm). Fenomena ini terjadi pula pada beton di jembatan Suramadu. Biofilm yang nantinya berkembang menjadi makrofouling rentan menimbulkan kerusakan sehingga diperlukan upaya untuk menghambat penempelan biofilm. Penelitian ini bertujuan untuk menganalisa kemampuan antifouling ekstrak teripang (Phyllophorus sp.) terhadap biofilm yang muncul di perairan jembatan Suramadu. Pengambilan sampel biofilm didapatkan dari permukaan rendaman beton di perairan jembatan Suramadu. Tahapan penelitian dimulai dari identifikasi bakteri biofilm secara morfologi, pembuatan ekstrak teripang dan pengujian antifouling dengan uji fitokimia dan uji zona hambat. Uji zona hambat ekstrak teripang (Phyllophorus sp.) dilakukan dengan hasil rendemen sebesar 5,64% dengan 2 variasi ekstrak uji yaitu 100% ekstrak dan 50% ekstrak. Bakteri biofilm diketahui terdiri dari bakteri gram positif kokus, gram positif basil, gram negatif kokus dan tidak ditemukan gram negatif basil. Hasil uji fitokimia sebagai agen antifouling yang dapat menghambat pertumbuhan biofilm antara lain fitokimia alkaloid, flavonoid dan terpernoid. Tingkat hambat ekstrak dengan kategori kuat ditemukan pada variasi ekstrak 100% yaitu 2,34–10,92 mm pada 5 isolat, pada ekstrak 50% zona hambat pada kategori lemah. Hasil ini menunjukkan adanya potensi penggunaan ektrak teripang (Phyllophorus sp.) terhadap biofilm yang muncul di perairan jembatan Suramadu.Kata kunci: Antifouling, Biofilm, Biofouling, Ekstrak Teripang, Jembatan SuramaduABSTRACTBiofouling on the concrete surface begins with the adhesion of bacterial and microalgae colonies (biofilm). This phenomenon also occurs on the concrete of the Suramadu Bridge. Biofilms, which eventually develop into macrofouling, are prone to causing damage, necessitating efforts to inhibit biofilm attachment. This study aims to analyze the antifouling potential of sea cucumber extract (Phyllophorus sp.) against biofilms found in the waters of the Suramadu Bridge. Biofilm samples were obtained from the surface of concrete submerged in the waters around the Suramadu Bridge. The research stages included the morphological identification of biofilm bacteria, preparation of sea cucumber extract, and antifouling testing through phytochemical analysis and inhibition zone tests. The inhibition zone test of the sea cucumber extract (Phyllophorus sp.) yielded a 5.64% extract with two variations tested: 100% extract and 50% extract. The biofilm bacteria were identified as gram-positive coccus, gram-positive bacilli, gram-negative coccus, but none of gram-negative bacilli found. The phytochemical analysis indicated that alkaloids, flavonoids, and terpenoids in the extract served as antifouling agents capable of inhibiting biofilm growth. A strong inhibition was observed in the 100% extract variation by the diameter 2,34 – 10,92 mm for 5 isolats, while the 50% extract showed weak inhibition. These results demonstrate the potential use of sea cucumber extract (Phyllophorus sp.) in controlling biofilm formation in the waters surrounding the Suramadu Bridge..Keyword: Antifouling, Biofilm, Biofouling, Sea Cucumber Extract, Suramadu Bridge
Analisis Pengaruh Tekanan Udara, Kelembaban, dan Suhu Udara terhadap Curah Hujan di Kota Bengkulu selama El Niño 2023 Wahyuni, Ani Sri; Edkayasa, Mardho Tillah; Johan, Septi; Norfahmi, Siti Hairunnisa; Lizalidiawati, Lizalidiawati
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.29965

Abstract

ABSTRAKFenomena El Niño sangat memengaruhi dinamika atmosfer, meliputi variabel seperti tekanan udara, kelembaban, dan suhu, sehingga memengaruhi pola presipitasi di Kota Bengkulu. Penelitian ini bertujuan untuk mengetahui hubungan antara tekanan udara, kelembaban udara, dan suhu udara terhadap pola curah hujan dari tahun 2019 hingga 2023, dengan fokus pada fenomena El Niño yang terjadi pada tahun 2023. Data diperoleh dari Stasiun Klimatologi Bengkulu dan Stasiun Meteorologi Fatmawati Soekarno, serta data Oceanic Niño Index (ONI) dari NOAA. Penelitian ini menggunakan metodologi deskriptif dan analisis regresi linier berganda, yang dilakukan dengan menggunakan Microsoft Excel. Hasil penelitian menunjukkan bahwa terdapat korelasi yang signifikan antara suhu udara, tekanan udara, dan kelembaban udara di Stasiun Klimatologi, dengan koefisien korelasi sebesar 0,54. Sebaliknya, parameter cuaca di Stasiun Meteorologi memiliki koefisien korelasi yang lebih rendah, yaitu 0,42. Hasil ini menyatakan bahwa adanya varians dalam hubungan antara variabel meteorologi tersebut di berbagai lokasi pengamatan. Hal ini mengonfirmasi bahwa El Niño menyebabkan penurunan curah hujan akibat meningkatnya suhu dan tekanan udara, serta berkurangnya kelembaban. Penelitian ini berpotensi menyediakan kerangka dasar untuk mengurangi dampak buruk kekeringan akibat perubahan iklim di wilayah Kota Bengkulu.Kata Kunci : Suhu Udara, Kelembaban, Tekanan, Curah Hujan, El Nino.ABSTRACTThe El Niño phenomenon significantly influences atmospheric dynamics, including factors like as air pressure, humidity, and temperature, hence impacting precipitation patterns in Bengkulu City. This study seeks to ascertain the correlation between air pressure, humidity, and temperature concerning rainfall patterns from 2019 to 2023, emphasising the El Niño phenomena of 2023. Data were acquired from the Bengkulu Climatology Station, the Fatmawati Soekarno Meteorology Station, and the Oceanic Niño Index (ONI) data provided by NOAA. This research employed a descriptive methodology and multiple linear regression analysis conducted via Microsoft Excel. The findings indicated a substantial association among air temperature, air pressure, and air humidity at the Climatology Station, with a correlation coefficient of 0.54. The Meteorology Station exhibited a lower correlation coefficient of 0.42 for the identical parameters. The results demonstrate variability in the correlation among these meteorological variables across different observation sites. The results indicate that El Niño leads to less precipitation owing to elevated temperature and air pressure, together with diminished humidity. This research may establish a foundational paradigm for alleviating the detrimental effects of climate change-induced droughts in coastal regions.Keywords: Air Temperature, Humidity, Pressure, Rainfall, El Nino.
Respon Suhu Permukaan Laut Dan Klorofil-A Saat Triple-Dip La Niña (2020–2023) Di Sulawesi Tenggara-Laut Banda Adrian, Muh Adhim; Asmadin, Asmadin; Takwir, Amadhan
Jurnal Kelautan Vol 18, No 2: Agustus (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

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Abstract

ABSTRAKFenomena triple-dip La Niña yang terjadi selama tiga tahun berturut-turut (2020–2023) merupakan peristiwa iklim global yang jarang terjadi dan berdampak signifikan terhadap dinamika oseanografi regional. Penelitian ini bertujuan untuk menganalisis variabilitas suhu permukaan laut (SPL) dan konsentrasi klorofil-a di perairan Sulawesi Tenggara hingga Laut Banda selama periode tersebut. Data SPL harian dan klorofil-a bulanan diperoleh dari Marine Copernicus dan dianalisis secara spasial-temporal menggunakan pendekatan statistik dan visualisasi musiman. Hasil menunjukkan bahwa selama La Niña berkepanjangan, SPL mengalami penurunan konsisten dan diikuti oleh fluktuasi klorofil-a yang menunjukkan peningkatan pada musim dan lokasi tertentu, terutama di wilayah pesisir dan perairan dangkal. Sementara itu, indeks ONI secara konsisten menunjukkan nilai negatif selama tiga tahun, mengonfirmasi keberadaan La Niña multiyear yang memperkuat sirkulasi atmosfer timur dan mendorong proses upwelling di wilayah studi. Temuan ini menegaskan pentingnya pemantauan berkelanjutan terhadap parameter oseanografis dan indikator iklim global dalam memahami dampak jangka panjang ENSO terhadap ekosistem laut tropis Indonesia.Kata Kunci: ENSO, klorofil-a, La Niña, ONI, suhu permukaan laut.ABSTRACTThe triple-dip La Niña phenomenon that persisted for three consecutive years (2020–2023) is a rare global climate event with significant impacts on regional oceanographic dynamics. This study aims to analyze the variability of sea surface temperature (SST) and chlorophyll-a concentration in the waters of Southeast Sulawesi to the Banda Sea during this period. Daily SST data and monthly chlorophyll-a data from Marine Copernicus were analyzed spatio-temporally using statistical approaches and seasonal visualization. The results reveal a consistent decrease in SST, accompanied by an increase in chlorophyll-a during specific seasons and locations, particularly in coastal and shallow waters. The Oceanic Niño Index (ONI) remained negative over the three years, confirming a multiyear La Niña that strengthened easterly atmospheric circulation and enhanced upwelling in the study area. These findings highlight the importance of long-term monitoring of oceanographic parameters and global climate indicators to better understand and anticipate the impacts of ENSO on tropical marine ecosystems in Indonesia.Keywords: ENSO, chlorophyll-a, La Niña, ONI, sea surface temperature.
Distrubution and Morphological Identification of Eel (Anguilla sp.) In Kayoa Sea, South Halmahera, North Maluku Achmad, M Janib; Akbar, Nebuchadnezzar; Samman, Ardan; Supyan, Supyan; Ismail, Firdaut; Samad, Julkar
Jurnal Kelautan Vol 18, No 2: Agustus (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.v18i2.27507

Abstract

North Maluku Province is an archipelagic province that has a sea area of 113,796.53 km2 or 70% of the land area. As an archipelagic area, North Maluku waters have high biodiversity. One of the important biota in North Maluku waters is the eel. Eel is one of the water resources that have high economic value, because of its nutritional contentEel (Anguilla sp) is a catadromous fish that begins its life in the larval or juvenile phase in marine waters and grows up in brackish and fresh waters. This study aims to determine the distribution of eel species (Anguilla sp) in the seas and the morphometric eel (Anguilla sp) in kayoa waters. The results showed that the number of eels found at both stations was 13 tails. The results of the morphological analysis showed that the type of eel found at both stations was A. marmorata, the morphometric identification results showed that at station 1, the total length range was 50 - 106 cm, with a weight of 460-4100 grams, while at station 2 obtained a length range of 65 cm - 83 cm, with a weight of 79 -1300 grams. Key Word: Area, Morphometri, Anguilla, Small Island, Tropis

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