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JFMR (Journal of Fisheries and Marine Research)
Published by Universitas Brawijaya
ISSN : 2337621X     EISSN : 25810294     DOI : -
Core Subject : Science, Agriculture, Social, Engineering,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Engineering Environmental Science
Journal of Fisheries and Marine Research (JFMR) is dedicated to published highest quality of research papers on all aspects of : Aquatic Resources, Aquaculture, Fisheries Resources Technology and Management, Fish Technology and Processing, Fisheries and Marine Social Economic and Marine Science. This journal is jointly published by Faculty of Fisheries and Marine Science, Brawijaya University Malang Indonesia and Ikatan Sarjana Perikanan Indonesia (Ispikani). JFMR is a new journal but related to the past journal of Faculty of Fisheries and Marine Science that is Jurnal Penelitian Perikanan (JPP) with ISSN: 2337-621X (print version) and website link of www.jpp.ub.ac.id
Arjuna Subject : -
Articles 640 Documents
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Analisis Morfologi, Morfometrik, dan Biomassa Lamun Halophila Ovalis di Perairan Pulau Tunda, Banten: Morphological, Morphometric, and Biomass Analysis of Halophila Ovalis Seagrass in the Waters of Tunda Island, Banten Rochmah, Syifaur; Soleha, Sabrina Rahima; Harahap, Muhammad Hafiz Arkana; Alzahira, Nurya Zahra; Saad, Moch
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.11

Abstract

Ekosistem lamun berperan penting bagi lingkungan pesisir sebagai habitat, tempat mencari makan, dan penstabil sedimen. Halophila ovalis merupakan jenis lamun yang umum ditemukan di Indonesia, termasuk di Pulau Tunda, Banten. Penelitian ini bertujuan mengkaji kondisi Halophila ovalis melalui analisis morfologi, morfometrik, dan biomassa serta hubungannya dengan kualitas perairan. Pengambilan data dilakukan pada tanggal 20–21 September 2025 menggunakan metode purposive sampling dengan transek-kuadrat 0,5 × 0,5 m² di tiga stasiun. Data primer, seperti morfologi, morfometrik, dan biomassa, diambil dengan cara mengamati dan mengukur langsung di lapangan. Sementara itu, data sekunder meliputi suhu, salinitas, pH, oksigen terlarut (DO), dan kecerahan, yang diukur menggunakan alat termometer, refraktometer, pH meter, dan DO meter. Hasil menunjukkan adanya variasi kerapatan dan biomassa antarstasiun. Kerapatan tertinggi ditemukan pada Stasiun 1 dan 2 dengan kondisi DO dan pH optimal, sedangkan Stasiun 3 menunjukkan kerapatan rendah akibat DO rendah (3,2 mg/L) dan pH lebih tinggi (8,55). Hal ini menegaskan bahwa DO dan pH merupakan faktor utama yang memengaruhi distribusi dan produktivitas Halophila ovalis di Pulau Tunda. Temuan ini dapat menjadi dasar pengelolaan dan konservasi ekosistem lamun secara berkelanjutan.   Seagrass ecosystems play an important role in coastal environments as habitats, feeding grounds, and sediment stabilizers. Halophila ovalis is a type of seagrass commonly found in Indonesia, including on Tunda Island, Banten. This study aims to assess the condition of Halophila ovalis through morphological, morphometric, and biomass analyses and their relationship to water quality. Data collection was conducted on September 20–21, 2025, using a purposive sampling method with a 0.5 × 0.5 m² quadratic transect at three stations. Primary data, such as morphology, morphometrics, and biomass, were collected through direct observation and measurement in the field. Meanwhile, secondary data included temperature, salinity, pH, dissolved oxygen (DO), and brightness, which were measured using a thermometer, refractometer, pH meter, and DO meter. The results showed variations in density and biomass between stations. The highest densities were found at Stations 1 and 2 with optimal DO and pH conditions, while Station 3 showed low densities due to low DO (3.2 mg/L) and higher pH (8.55). This confirms that DO and pH are the main factors influencing the distribution and productivity of Halophila ovalis on Tunda Island. These findings can form the basis for sustainable management and conservation of seagrass ecosystems.
Pola Musim Penangkapan Ikan Pelagis: Studi Kasus Armada Perahu Sekoci dan Slerek di Pelabuhan Perikanan Pantai Pondokdadap: Seasonal Patterns of Pelagic Fish Fisheries: A Case Study of the Sekoci and Slerek Fishing Fleets at Pondokdadap Coastal Fishing Port Anam, M. Choirul; Khamidah, Nur; Yasmin, Delviega Aisyah; Harlyan, Ledhyane Ika; Marhendra, Agung Pramana Warih; Wiadnya, Dewa Gede Raka
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.9

Abstract

Musim penangkapan ikan didefinisikan sebagai waktu-waktu dalam setahun di mana aktivitas penangkapan bisa menghasilkan ikan target secara optimal. Studi ini bertujuan untuk (1) analisis musim penangkapan terhadap ikan target dari armada perikanan Sekoci (pancing) dengan armada Slerek (purse seine), dan (2) analisis produksi hasil tangkapan nelayan yang beroperasi pada musim barat yang oleh sebagian besar nelayan dianggap sebagai musim paceklik. Penelitian dilakukan pada PPP Pondokdadap pada armada Sekoci dan Slerek. Data hasil tangkapan harian yang diagregasi menjadi bulanan dari kedua armada dikumpulkan dari Januari 2021 sampai Desember 2024. Jenis ikan hasil tangkapan diidentifikasi menggunakan panduan penciri morfologis. CPUE dihitung sebagai hasil pendaratan (kg) per jumlah trip pendaratan (landing trips) dan dianalisis menggunakan Indeks Musim Penangkapan (IMP) berbasis rata-rata bergerak (moving average) terhadap CPUE bulanan. Perbedaan rata-rata CPUE antar bulan diuji menggunakan analisis ragam (ANOVA). Hasil analisis mendapatkan bahwa hasil tangkapan utama dari armada Sekoci ialah tuna oseanik, (madidihang, mata besar, albakora, dan sirip biru), baby tuna dan cakalang dengan ikan non-target (by-catch) marlin (setuhuk/layaran) dan lemadang. Armada Slerek menargetkan ikan pelagis kecil (lemuru dan layang), baby tuna, cakalang, dan tongkol. IMP mengindikasikan bahwa puncak musim relatif terhadap tuna oseanik beserta ikan non-target seperti marlin dan lemadang terjadi pada musim timur (April–September), sedangkan lemuru, layang, baby tuna, dan cakalang cenderung meningkat pada musim barat. Total armada Sekoci yang beroperasi selama musim barat hanya mencapai 5±2,3% dari total armada aktif yang beroperasi, kurang dari setengah armada Slerek (13±1,9%) yang beroperasi selama musim yang sama. IMP menunjukkan kecenderungan musiman relatif, meskipun uji beda rata-rata CPUE antar bulan tidak signifikan (p>0,05) baik pada armada Sekoci maupun Slerek. Tingginya armada Slerek yang beroperasi pada musim barat berhubungan dengan wilayah operasi yang lebih dekat dengan pantai (di dalam wilayah 12 mil), sebaliknya, armada Sekoci melakukan operasi lebih jauh (> 12 mil) dengan mentargetkan tuna oseanik.   Fishing seasons are defined as periods within a year when fishing activities can optimally produce the target catch. This study aims to (1) analyze the fishing seasonality of target species for the Sekoci fleet (handline) in comparison with the Slerek fleet (purse seine), and (2) assess catch production from fishers operating during the west monsoon, which most fishers consider the lean season. The study was conducted at Pondokdadap Coastal Fishing Port (PPP Pondokdadap) focusing on the Sekoci and Slerek fleets. Daily landing records aggregated into monthly data were collected from January 2021 to December 2024. Landed species were identified using morphological identification guides. CPUE was calculated as landed catch (kg) per number of landing trips and analyzed using a Fishing Season Index (FSI/IMP) based on a moving average of monthly CPUE. Differences in mean monthly CPUE were tested using analysis of variance (ANOVA). The results show that the Sekoci fleet’s main catches are oceanic tunas (yellowfin, bigeye, albacore, and bluefin), baby tuna, and skipjack, with non-target by-catches of marlins (sailfish/spearfish) and dolphinfish. The Slerek fleet targets small pelagic fish (sardines and scads), as well as baby tuna, skipjack, and mackerel tuna. The FSI indicates a relative peak season for oceanic tunas and the non-target by-catches (marlins and dolphinfish) during the east monsoon (April–September), whereas sardines, scads, baby tuna, and skipjack tend to increase during the west monsoon. During the west monsoon, the proportion of operating Sekoci vessels averaged 5±2.3% of the active fleet, less than half that of the Slerek fleet (13±1.9%) operating in the same season. The FSI captures relative seasonal tendencies, although differences in mean monthly CPUE were not statistically significant (p>0.05) for either fleet. The higher proportion of Slerek vessels operating during the west monsoon is associated with their nearshore fishing grounds (within 12 nautical miles) and primary target species (sardines, scads, baby tuna, and skipjack). In contrast, the Sekoci fleet-which primarily targets oceanic tunas-is more active during the east monsoon.
Struktur Komunitas Zooplankton dan Morfologi Copepoda sebagai Indikator Ekosistem Mangrove di Perairan Timur Pulau Tunda: Structure of Zooplankton Community and Morphology of Copepods as Indicators of Mangrove Ecosystem in the Eastern Waters of Tunda Island Neysa, Vania; Rizky , Putri Aulia; Wijaya , Zaskia Permata; Aditya, Muhammad Rifky; Gustiawan, Muhammad Sabda
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.12

Abstract

Penelitian ini bertujuan menganalisis struktur komunitas zooplankton di perairan timur Pulau Tunda, Kabupaten Serang, Banten, dengan fokus pada morfologi Copepoda sebagai kelompok dominan. Penelitian dilaksanakan pada September 2025 menggunakan metode purposive sampling pada tiga titik pengamatan berjarak 50 m. Sampel zooplankton dikoleksi dengan plankton net berukuran 25 µm menggunakan metode timba, kemudian diidentifikasi secara morfologis. Hasil penelitian menemukan total 32 individu zooplankton dari sepuluh kelas, dengan Copepoda sebagai kelompok paling dominan. Kelimpahan tertinggi tercatat di titik 2 dan 3 masing‑masing sebesar 50.000 ind/100 L, sedangkan kelimpahan di titik 1 lebih rendah (30.000 ind/100 L), yang diduga berkaitan dengan kondisi lingkungan yang dipengaruhi vegetasi mangrove. Parameter fisik‑kimia perairan (suhu 30–31 °C, salinitas 31–35 ppt, pH 6,8–7, DO 6,39 mg/L) berada pada kisaran yang mendukung kehidupan zooplankton. Struktur komunitas yang relatif beragam dengan dominansi Copepoda menunjukkan bahwa perairan timur Pulau Tunda memiliki tingkat kesuburan yang baik. Analisis morfologi Copepoda mengungkap variasi bentuk tubuh, antena, dan segmen yang mencerminkan adaptasi terhadap kondisi lingkungan mangrove. Copepoda berpotensi sebagai indikator biologis untuk menilai kualitas air dan stabilitas ekosistem mangrove pesisir.   This study aims to analyze the structure of the zooplankton community in the eastern waters of Tunda Island, Serang Regency, Banten, with a focus on the morphology of Copepods as the dominant group. The research was conducted in September 2025 using a purposive sampling method at three observation points spaced 50 m apart. Zooplankton samples were collected using a 25 µm plankton net with a bucket method and identified morphologically in the laboratory. The results revealed a total of 32 individuals from ten classes, with Copepoda being the most dominant group. The highest abundance was recorded at points 2 and 3, each reaching 50,000 ind/100 L, while point 1 showed lower abundance (30,000 ind/100 L), presumably influenced by environmental conditions related to mangrove vegetation. Physical‑chemical parameters (temperature 30–31 °C, salinity 31–35 ppt, pH 6.8–7, DO 6.39 mg/L) were within the optimal range for zooplankton survival. The relatively diverse community structure with copepod dominance indicates good fertility in the eastern waters of Tunda Island. Morphological analysis of copepods revealed variations in body shape, antennae, and segments reflecting adaptation to mangrove environmental conditions. Copepods have the potential to serve as biological indicators for assessing water quality and the stability of coastal mangrove ecosystems.
Fishermen’s Competency in the Use of Modern Electronic Equipment in Deep-Sea Fisheries of Tamil Nadu, India Sendurpandian, Viswanathan
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.5

Abstract

The increasing adoption of electronic navigation, communication, and monitoring technologies has transformed fishing vessel operations; however, the benefits of these systems depend strongly on fishermen’s competency in using them effectively. This study assesses the availability, usage, and competency levels of fishermen operating modern electronic equipment on deep-sea fishing vessels in Tamil Nadu, India. The key variables examined include fishermen’s competency scores in using ten categories of electronic equipment (GPS, AIS, RADAR, electronic charts, echo sounder, magnetic compass, VHF radio, NAVTEX/NavIC/GEMINI, barometer, and anemometer), along with demographic factors (age, education), operational characteristics (vessel type, vessel length, distance travelled), and harbour location. A competency framework was developed using a four-point ordinal scale ranging from unfamiliarity to confident operation, yielding a maximum composite score of 40. Data were collected from 405 fishing vessel drivers across six major fishing harbours from Tamilnadu using a convenience sampling approach, representing approximately 20% of fishing vessel drivers at each harbour. Statistical analyses were performed using Jamovi, Excel, including descriptive statistics, Shapiro–Wilk tests for normality, Kruskal–Wallis H tests for group comparisons, and Spearman’s rank correlations to examine relationships between competency and explanatory variables. Instrument reliability was confirmed using Cronbach’s alpha (α > 0.8). Results reveal significant variations in competency across fishing harbours and vessel types (p < 0.001). Age and education were positively associated with competency, whereas vessel length and distance travelled were negatively correlated. Notably, awareness and usage of advanced systems such as NAVTEX, NavIC, GEMINI, barometers, and anemometers were low, whereas GPS, AIS, and electronic charts were more widely adopted. The study concludes that technology availability alone is insufficient; targeted training and capacity-building interventions are essential to improve competency, enhance safety, and promote sustainable fishing practices in Tamil Nadu.
Analisis Akurasi Data Batimetri Single Beam Echosounder System (SBES) dan Satellite Derived Bathymetry (SDB) (Studi Kasus Perairan Kabupaten Cilacap, Jawa Tengah): Accuracy Analysis of Single Beam Echosounder System (SBES) and Satellite Derived Bathymetry (SDB) Data (Cased Study the Waters of Cilacap Regency, Central Java) Setyawan, Fahreza Okta; Rahman, Alham Danendra; Hidayati, Nurin; Fuad, Mochamad Arif Zainul; Semedi, Bambang; Setyoningrum, Desy
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.4

Abstract

Hidrografi dan batimetri menyediakan informasi kedalaman dan bentuk dasar perairan yang sangat penting bagi navigasi, perencanaan pelabuhan, rekayasa pantai, dan tata ruang laut, terutama pada perairan dinamis dan keruh seperti Kabupaten Cilacap yang berbatasan langsung dengan Samudera Hindia. Penelitian ini bertujuan menganalisis akurasi data batimetri Satellite Derived Bathymetry (SDB) berbasis citra PlanetScope beresolusi tinggi dan membandingkannya dengan hasil pemeruman Single Beam Echosounder System (SBES). Data SBES dikumpulkan menggunakan Garmin 585 C, sedangkan kedalaman SDB diekstraksi dengan algoritma machine learning Generalized Additive Model (GAM). Data dibagi 75% untuk training dan 25% untuk testing, dan kinerja model dinilai menggunakan koefisien determinasi (R²) dan Root Mean Square Error (RMSE). Pengolahan data didukung perangkat lunak SIG dan penginderaan jauh seperti ArcMap, SNAP, ENVI, Global Mapper, RStudio, dan Surfer. Hasil menunjukkan SBES memiliki akurasi tinggi dan tetap menjadi rujukan utama pemetaan dasar perairan Cilacap. Sebaliknya, model SDB–GAM menghasilkan R² sebesar 0,35 dan RMSE 2,80 sehingga belum mampu merepresentasikan variasi kedalaman pada perairan. Nilai ini rendah karena perairan Cilacap yang keruh serta keberadaan sunglint pada citra menyebabkan distorsi reflektansi sehingga kedalaman hasil SDB sulit merepresentasikan variasi kedalaman aktual. Oleh karena itu, SDB – GAM belum direkomendasikan untuk pemetaan operasional di perairan keruh seperti Cilacap tanpa koreksi glint dan peningkatan strategi pemodelan, serta lebih tepat digunakan sebagai pemetaan awal pada kondisi perairan yang lebih jernih dan kedalaman terbatas.   Hydrography and bathymetry provide information on water depth and seabed morphology that is crucial for navigation, port planning, coastal engineering, and marine spatial planning, especially in dynamic and turbid waters such as Cilacap Regency, which borders directly with the Indian Ocean. This study aims to analyze the accuracy of bathymetric data Satellite Derived Bathymetry (SDB) derived from high-resolution PlanetScope imagery and compare it with obtained from Single Beam Echosounder System (SBES) sounding. SBES data were collected using a Garmin 585 C, while SDB depths were extracted using the Generalized Additive Model (GAM) machine learning algorithm. Data were split into 75% for training and 25% for testing, and model performance was evaluated using the coefficient of determination (R²) and Root Mean Square Error (RMSE). Data processing was supported by GIS and remote sensing software such as ArcMap, SNAP, ENVI, Global Mapper, RStudio, and Surfer. The results show that SBES provides high accuracy and remains the primary reference for seabed mapping in Cilacap waters. Conversely, the SDB–GAM model produces an R² of 0.35 and an RMSE of 2.80, indicating that it has not yet adequately represented depth variability in waters. This value is low because the murky waters of Cilacap and the presence of sunglint in the image cause reflectance distortion, making it difficult for the SDB results to represent actual depth variatons. Therefore, SDB-GAM is not yet recommended for operational mapping in murky waters such as Cilacap without glint correction and improved modeling strategies, and is more appropriately used for initial mapping in clearer waters and limited depths.
Analisis Kesesuaian Area Kerja pada Kapal Gillnet Hasil Konversi Kapal Lampara (Trawl): Suitability Analisis of Working Area for Gillnet Vessel Modification from Lampara (Trawl) Vessel Sukardi, Sudirman; Wahab, Aulia Azhar; Fadhani, Ahmad Najmuddin Pangku
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.6

Abstract

Penggunaan alat tangkap pukat hela (trawl) masih dijumpai di wilayah pesisir Kalimantan Selatan. Meskipun telah dilarang melalui Peraturan Menteri Kelautan dan Perikanan Nomor 2/PERMEN-KP/2015. Di Kabupaten Tanah Laut, alat tangkap ini dikenal sebagai lampara yang secara operasional memiliki karakteristik serupa dengan trawl. Keberadaan lampara menimbulkan permasalahan dari aspek legalitas, ekologi, dan sosial, sehingga diperlukan upaya konversi ke alat tangkap yang lebih ramah lingkungan, salah satunya gillnet. Penelitian ini bertujuan menganalisis kesesuaian kebutuhan area kerja (working area) pada kapal gillnet hasil redesain kapal lampara. Metode yang digunakan adalah rekayasa desain melalui pengubahan general arrangement dan tata letak area kerja kapal lampara agar sesuai dengan kebutuhan operasional kapal gillnet. Data yang digunakan terdiri atas 34 kapal, dengan rincian 17 kapal lampara dan 17 kapal gillnet. Redesain dilakukan melalui penggambaran ulang general arrangement untuk menyesuaikan tata letak area kerja berdasarkan acuan desain kapal gillnet. Analisis ketersediaan area kerja dilakukan dengan membandingkan luas area bebas yang tersedia dan kebutuhan area kerja anak buah kapal (ABK). Hasil analisis two-step cluster terhadap rasio ukuran utama menunjukkan bahwa kapal lampara dan kapal gillnet memiliki tingkat kemiripan yang tinggi, sehingga secara teknis relevan untuk dialihfungsikan menjadi kapal gillnet. Ketersediaan working area pada kapal gillnet eksisting sebesar 2,10 m², sedangkan pada kapal gillnet hasil redesain mencapai 4,3 m² dengan area bebas sebesar 3,3 m². Hasil ini menunjukkan bahwa ketersediaan area kerja pada kapal gillnet hasil redesain masih mencukupi untuk pengoperasian oleh dua orang ABK.   Trawl fishing gear is still found in use in the coastal waters of South Kalimantan, although it has been prohibited under the Regulation of the Minister of Marine Affairs and Fisheries Number 2/PERMEN-KP/2015. In Tanah Laut Regency, this fishing gear is locally known as lampara, which operationally has characteristics similar to trawl. The use of lampara causes legal, ecological, and social problems, therefore conversion to more environmentally friendly fishing gear, such as gillnet, is required. This study aims to analyze the suitability of working area requirements on gillnet vessels resulting from the redesign of lampara vessels. The method used was design engineering by modifying the general arrangement and the working area layout of lampara vessels to conform to the operational requirements of gillnet vessels. The data consisted of 34 vessels, including 17 lampara vessels and 17 gillnet vessels. The redesign was carried out by redrawing the general arrangement to adjust the working area layout based on gillnet vessel design references. The analysis of working area availability was conducted by comparing the available free area with the working area requirements of the crew. The results of the two-step cluster analysis on the ratios of principal dimensions show that lampara vessels and gillnet vessels have a high level of similarity, indicating that they are technically feasible to be converted into gillnet vessels. The available working area on existing gillnet vessels is 2.10 m², while the redesigned gillnet vessel provides a working area of 4.3 m² with a free area of 3.3 m². These results indicate that the working area on the redesigned gillnet vessel is sufficient to support operations by two crew members.
Peramalan Produksi Ikan Hasil Tangkapan di Pelabuhan Perikanan Pantai Bulu Tuban Dengan Menggunakan Metode Sarima: Forecasting of Fish Catch Production at Bulu Tuban Fishing Port Using the Sarima Method Hidayah, Lisa Nur; Fuad; Marsela, Kristina
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.8

Abstract

Produksi ikan hasil tangkapan yang didaratkan di Pelabuhan Perikanan Pantai (PPP) Bulu Tuban menunjukkan fluktuasi bulanan dengan pola musiman yang jelas, sehingga diperlukan pendekatan peramalan yang mampu merepresentasikan dinamika tersebut. Penelitian ini bertujuan mengidentifikasi pola deret waktu produksi ikan bulanan di PPP Bulu Tuban dan membangun model peramalan menggunakan Seasonal Autoregressive Integrated Moving Average (SARIMA). Data yang digunakan berupa data sekunder produksi ikan bulanan periode Januari 2019–Desember 2024 sebanyak 72 observasi. Pemodelan dilakukan mengikuti prosedur Box–Jenkins melalui visualisasi deret waktu, differencing non-musiman dan musiman , identifikasi kandidat model berdasarkan ACF dan PACF, serta estimasi dan seleksi model. Kinerja model dievaluasi menggunakan Bayesian Information Criterion (BIC), Root Mean Square Error (RMSE), dan Mean Absolute Percentage Error (MAPE), sedangkan diagnostik residual diuji dengan Ljung–Box. Hasil menunjukkan bahwa SARIMA merupakan model terbaik dengan BIC 10,797, RMSE 199,346, MAPE 207,607, dan residual yang memenuhi asumsi white noise . Model ini mampu merepresentasikan pola historis dan komponen musiman data, namun karena nilai MAPE masih tinggi, hasil peramalan lebih tepat diposisikan sebagai proyeksi pola umum produksi untuk tahun 2025 daripada prediksi numerik presisi tinggi pada setiap bulan.   Fish catch production landed at Bulu Tuban Fishing Port exhibits monthly fluctuations with a clear seasonal pattern, indicating the need for a forecasting approach capable of representing such dynamics. This study aimed to identify the monthly time-series pattern of fish production at Bulu Tuban Fishing Port and to develop a forecasting model using the Seasonal Autoregressive Integrated Moving Average (SARIMA) approach. The analysis used secondary monthly fish production data from January 2019 to December 2024, comprising 72 observations. Modeling followed the Box–Jenkins procedure through time-series visualization, non-seasonal differencing, seasonal differencing, identification of candidate models based on ACF and PACF, and model estimation and selection. Model performance was evaluated using the Bayesian Information Criterion (BIC), Root Mean Square Error (RMSE), and Mean Absolute Percentage Error (MAPE), while residual adequacy was assessed using the Ljung–Box test. The results show that SARIMA was the best model, with a BIC of 10.797, RMSE of 199.346, MAPE of 207.607, and residuals satisfying the white-noise assumption . The model was able to represent the historical and seasonal structure of the data; however, given the relatively high MAPE, the forecast should be interpreted more cautiously as a projection of general production patterns for 2025 rather than a high-precision monthly numerical prediction.
Spatial–Seasonal Mapping of Estuarine Bed Sediment Texture Under a Natural Mouth-Closure Regime: Evidence from the Kungkai Baru Estuary, Western Indonesia Nofridiansyah, Eko; Hartoko, Agus; Muskananfola, Max Rudolf; Helmi, Muhammad; Adi, Wahyu
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.10

Abstract

Seasonally closed estuaries are vulnerable coastal systems in which alternating phases of mouth closure and opening strongly influence hydrodynamics, sediment transport, and benthic habitats. The Kungkai Baru Estuary on the wave-dominated western coast of Sumatra, Indonesia, is a small tropical estuary that predictably closes during the west monsoon and re-opens during the east monsoon. Although previous studies have documented major morphodynamic changes and shifts in macrozoobenthic communities between these phases, the associated near-bed sediment dynamics remain insufficiently understood. This study examined spatial and seasonal patterns of bed sediment texture using surface sediment samples collected at 21 stations during closed-mouth and open-mouth conditions and analysed through grain-size distribution and Folk–Ward statistics. Bed sediments were overwhelmingly sandy (>96% sand), but mean grain-size, sorting, and skewness showed clear spatial and seasonal variation. During the closed-mouth season, moderately well-sorted fine to medium sands dominated the middle and upper estuary, indicating reduced marine energy and greater retention of finer material. During the open-mouth season, coarser and more poorly sorted sands occurred near the estuary entrance, reflecting stronger marine influence and more active sediment exchange. These findings align with previously reported longitudinal patterns in macrozoobenthos and provide a sediment-based framework for understanding benthic habitat heterogeneity in seasonally closed tropical estuaries.
Pengaruh Kitosan dalam Formulasi Adonan Pelapis untuk Stik Ikan Patin Terhadap Sifat Fisikokimia dan Laju Penyerapan Minyak: Effect of Chitosan in Batter Formulations for Coating of Pangasius Fish Sticks on Physicochemical Properties and Oil Uptake Rate Jazili, Abdul Aziz; Sumarto, Tria Are; Rachma, Amelia Rizka
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.7

Abstract

Penelitian ini bertujuan untuk mengkaji pengaruh konsentrasi kitosan dalam adonan pelapis terhadap sifat fisikokimia dan penyerapan minyak pada stik ikan patin (Pangasius sp.) yang digoreng. Kitosan diketahui memiliki sifat pembentuk film dan hidrofilik yang mampu membentuk lapisan pelindung pada permukaan produk sehingga berpotensi menghambat penetrasi minyak selama proses penggorengan. Berbagai konsentrasi kitosan (0%, 0,5%, 1,0%, dan 1,5%) digunakan dalam formulasi adonan untuk melapisi stik ikan, yang kemudian diproses melalui penggorengan parsial pada suhu 180 ± 2°C selama 30 detik. Parameter kinerja pelapisan yang dianalisis meliputi coating pickup, cooking yield, frying loss, adhesion degree, fat uptake, dan fat reduction. Hasil menunjukkan bahwa penambahan kitosan secara signifikan (p < 0,05) meningkatkan coating pickup dan adhesion degree, serta mengurangi frying loss dan fat uptake pada stik ikan patin, dengan penurunan penyerapan minyak terbesar tercatat pada konsentrasi kitosan 1,0% (p < 0,05). Pengurangan minyak yang tercatat mencapai 58,61% pada konsentrasi kitosan 1,0%, menunjukkan bahwa kitosan efektif dalam mengurangi penyerapan minyak selama penggorengan. Selain itu, penambahan kitosan menghasilkan kadar air berkisar antara 56,79–63,57% dan kadar lemak 11,80–17,00%. Analisis statistik menunjukkan bahwa kadar air tidak berbeda nyata antar perlakuan (p > 0,05), sedangkan kadar lemak mengalami penurunan yang signifikan (p < 0,05). Profil warna produk menunjukkan peningkatan kecerahan dan intensitas kekuningan pada produk yang dilapisi kitosan. Penurunan penyerapan minyak dan peningkatan kualitas fisikokimia produk yang dilapisi kitosan ini menunjukkan potensi kitosan sebagai bahan pelapis yang efektif dalam meningkatkan kualitas produk gorengan, dengan mengurangi kandungan lemak dan mempertahankan kelembapan produk.   This study aimed to evaluate the effect of chitosan concentration in batter coating on the physicochemical properties and oil absorption of fried Pangasius fish sticks (Pangasius sp.). Chitosan is known for its film-forming and hydrophilic properties, which enable the formation of a protective layer on the product surface, thereby potentially inhibiting oil penetration during frying. Different chitosan concentrations (0%, 0.5%, 1.0%, and 1.5%) were incorporated into the batter formulation used to coat fish sticks, which were subsequently subjected to partial frying in vegetable oil at 180 ± 2°C for 30 s. The coating performance parameters evaluated included coating pickup, cooking yield, frying loss, adhesion degree, fat uptake, and fat reduction. The results indicated that the addition of chitosan significantly (p < 0.05) increased coating pickup and adhesion degree, while reducing frying loss and fat uptake in Pangasius fish sticks. The greatest reduction in oil absorption was observed at a chitosan concentration of 1.0% (p < 0.05), with oil reduction reaching 58.61%. In addition, the incorporation of chitosan resulted in moisture contents ranging from 56.79% to 63.57% and fat contents from 11.80% to 17.00%. Statistical analysis revealed that moisture content did not differ significantly among treatments (p > 0.05), whereas fat content decreased significantly (p < 0.05). The color profile of the products also showed increased brightness and yellowness in chitosan-coated samples. The reduction in oil absorption and improvement in physicochemical quality indicate that chitosan has strong potential as an effective coating ingredient for producing fried products with lower fat content while maintaining product moisture.
Comparative Analysis of SBES Bathymetry and Machine Learning-Based Satellite-Derived Bathymetry from Sentinel-2 in the Coastal Waters of Dubibir, Situbondo Fuad, Mochamad Arif Zainul; Zannuar, Rizky Wisudawan; Rijal, Seftiawan Syamsu; Setyawan, Fahreza Okta
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2026.010.01.13

Abstract

Accurate Bathymetryc information in shallow coastal waters is critical for marine navigation, coastal zone management, habitat assessment, and environmental monitoring. Conventional Bathymetryc surveys are limited by high operational costs, restricted spatial coverage, and time-consuming fieldwork. To overcome these challenges, the present study assesses the potential of Satellite-Derived Bathymetry (SDB) using Sentinel-2 imagery as an alternative, comparing it with in situ Bathymetryc measurements obtained via Single Beam Echosounder (SBES) in the coastal waters of Dubibir, Situbondo, Indonesia. Bathymetryc data were collected with an SBES GPSMAP 585c, and Sentinel-2 multispectral imagery was processed to estimate water depth using a Random Forest (RF) machine learning model. Results indicate that SBES measurements reached a maximum depth of 53.34 m, while Sentinel-2-derived bathymetry captured depths up to 29.61 m. Model evaluation yielded a coefficient of determination (R²) of 0.83, a mean absolute error (MAE) of 1.90 m, and a root mean square error (RMSE) of 3.56 m, demonstrating strong predictive performance in shallow-water environments. However, the findings also show reduced SDB capability in deeper, optically complex waters, particularly where turbidity limits light penetration and weakens the satellite signal. Overall, Sentinel-2 imagery combined with the RF algorithm offers a practical, cost-effective, and spatially efficient solution for shallow-water Bathymetryc mapping, while SBES remains essential for validation and for representing deeper seabed conditions. This study advances the application of machine learning-based SDB for coastal mapping and provides a relevant approach for generating Bathymetryc data in data-limited coastal regions.

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