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Jurnal Ilmu dan Teknologi Kelautan Tropis
Published by Institut Pertanian Bogor
ISSN : 20879423     EISSN : 2620309X     DOI : https://doi.org/10.29244/jitkt
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Library & Information Science
Aims and Scope Journal of Tropical Marine Science and Technology (Jurnal Ilmu dan Teknologi Kelautan Tropis) is a scientific journal in the field of tropical marine science and technology. We have a aims and scope to focus in publishing a good quality scientific articles for dissemination of research results in the field of marine science and technology. Aims As an media of information and dissemination of research results in the field of marine science and technology, especially in the waters of Indonesia and Southeast Asia region, Could actively and continuously disseminate the best research results to various stakeholders, and; This Journal of Tropical Marine Science and Technology can improve the quality of research results and benefit stakeholders. Scope The article, published in this Journal of Tropical Marine Science and Technology covers a wide range of research topics in the field of: marine biology, marine ecology, biological oceanography, chemical oceanography, physical oceanography, dynamical oceanography, coral reef ecology, marine acoustic, marine remote sensing, marine geographical information system, marine microbiology, marine polution, marine aquaculture, post-harvest fisheries technology, integrated coastal management (ICM) marine biotechnology, air-sea interaction, ocean engineering,
Arjuna Subject : Umum - Umum
Articles 670 Documents
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Analysis of the Potential Distribution of Eels (Anguilla spp.) Along the Luk Ulo River, Kebumen Regency, Central Jawa, Indonesia Waluyo; Hiskia Marceliko; Ellia Debby Leonny Putri Siswantoro
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.69607

Abstract

Eels are catadromous fish that utilize river systems, especially estuaries, as migration corridors from marine to upstream habitats. This study assessed the abundance potential and spatial distribution of eels in the Luk Ulo River, Kebumen Regency, to support conservation efforts. Sampling was conducted at 10 stations from upstream areas to the estuary. Analyses included morphometric identification, spatial distribution, length–weight relationships, growth modeling, Principal Component Analysis, and cross-correlation with environmental parameters. A total of 30 individuals were collected, consisting of two species: Anguilla bicolor bicolor (22 individuals) and A. marmorata (8 individuals). Most specimens (93.54%) were in the yellow eel phase, indicating a growth stage dominance, while 6.45% were elvers. The mean length was 49.90 cm (SD = 34.95 cm), with non-normal distribution (p < 0.05) and dominance in the 32–48 cm size class. Growth followed a negative allometric pattern (W = 0.00083L2.87), where length increases faster than weight, with a high determination coefficient (R² ≈ 0.93), indicating a strong relationship between length and weight. The population structure suggests that the Luk Ulo River primarily functions as a growth habitat with stable environmental conditions. Cross-correlation analysis showed strong positive relationships between eel abundance and salinity (r > 0.81), total dissolved solids (r > 0.79), and phosphate (r > 0.61), indicating that higher values of these parameters are associated with increased eel presence.
Carrying Capacity for Sustainable Mariculture Development in The Dampier Strait Conservation Area, West Papua Province Ichsan Suryo Wibowo Wibowo; Ali Mashar Mashar; Niken Tunjung Murti Pratiwi Pratiwi; Fery Kurniawan Kurniawan; Mazlan Mazlan
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.69613

Abstract

The Dampier Strait Marine Conservation Area has the potential to be a location for the development of seaweed and pearl oyster cultivation. Despite the potential, there is no information on the limitations of space utilization capacity in implementing mariculture activities for both commodities. Therefore, this study aims to determine the carrying capacity of mariculture activities in the Dampier Strait Conservation Area using the Ecosystem Approach to Aquaculture (EAA) concept. The study procedures included ecological and production carrying capacity, which were analyzed using the physical capacity approach. The results revealed that the area with the potential to be developed for mariculture activities was 904.36 ha. In addition, the number of seaweed and pearl oyster units that could be developed was 1,282 units and 805 units, respectively, with annual production volumes of 8,076.60 tons of dry seaweed and 2,817,500 individual pearl oyster spats ready for operation. All stages of the analysis provided comprehensive results to achieve an optimal and sustainable utilization area from the development of mariculture activities. The analysis also considered the continuity between environmental potential and human demands in the use of ecosystem services in an integrated manner.
First morphological and molecular report of needledscaled queenfish (Scomberoides tol) from Cilacap Waters, Penyu Bay, Indonesia Muhammad Browijoyo Santanumurti; Sugeng Hartono; I Gede Suweda Anggana Putera; Laksmi Sulmartiwi; Sapto Andriyono; Heru Pramono; Veryl Hasan; Mohamed Abu El-Regal
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.69798

Abstract

Fish misidentification often occurs in family Carangidae in Indonesia, especially genus Scomberoides, in Cilacap Waters. The condition can affect the fisheries management in the study area, because the management must be assessed to species level. The study aims to determine the physical characteristics and molecular information of the fish. Fish morphology was studied, tabulated, and documented according to its shape, colour, and general properties. Physical properties were measured and counted for morphometry and meristics study. DNA test was conducted to identify the species molecularly. DNA amplification method was polymerase chain reaction (PCR). The target gene used was the Cytochrome C Oxidase Subunit I (COI) gene. The primers used were FISH F1 and FISH R1. DNA sequencing used the Sanger dideoxy method. The fish was identified as Scomberoides tol physically with insignificant differences. There was no scutes and caudal peduncle groove in the fish. Its bases of anal and dorsal fin were equal in length. Finlets existed and semi–detached at posterior area to dorsal and anal fin. The type of scales and mouth was needle like and terminal, respectively. The fish shares 100% similarity of DNA with S. tol from previous studies across regions.
Wind-Driven Upwelling Dynamics in the Southwest Arafura Sea Nabila Nur Hanifah; I Wayan Nurjaya; Yuli Naulita; Nyoman M. N. Natih
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.69870

Abstract

This study examines the spatial and temporal variability of upwelling in the southwestern Arafura Sea, focusing on the influence of monsoonal winds and ENSO variability. The objective is to identify the physical mechanisms driving upwelling formation in the region. Satellite-derived sea surface temperature (SST) and chlorophyll-a data from 2010, 2015, and 2020 were analyzed during the Southeast Monsoon (June–August). In addition, wind data, surface currents, Ekman Mass Transport (EMT), and Ekman Pumping Velocity (EPV) were evaluated to investigate the underlying oceanographic processes. The results indicate that intensified southeasterly winds during the Southeast Monsoon enhance offshore Ekman transport and generate negative wind stress curl, leading to significant Ekman pumping with EPV values reaching up to −2.1 × 10⁻⁵ m/s. These processes promote the upwelling of cooler, nutrient-rich subsurface waters, as reflected by decreased SST and increased chlorophyll-a concentrations. Conversely, weaker wind forcing reduces Ekman dynamics and weakens upwelling intensity. Vertical profiles further confirm thermocline shoaling and the upward displacement of subsurface waters during strong wind conditions. In conclusion, upwelling variability in the southwestern Arafura Sea is primarily controlled by seasonal monsoonal winds and large-scale climate variability, while regional circulation, such as the Indonesian Throughflow, contributes to the availability of cooler subsurface water that enhances surface cooling when uplifted by Ekman processes.
Reanalysis of Mitochondrial and Nuclear Markers (COI, 16S, 28S) in Coenobitidae, Diogenidae, and Paguridae for Species Delimitation Tazkiah Auliaputri; Tyani Fitrian; Achmad Alfiyan; Intan Ratu Pratiwi; Vendi Eko Susilo; Ali Mashar; Achmad Farajallah
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.69987

Abstract

Public sequence repositories, such as GenBank, contain an extensive collection of molecular data that are widely used for phylogenetic inference and species identification. However, inconsistent annotation and potential misidentifications can obscure true genetic patterns, particularly in groups with complex morphology such as Paguroidea. This study reanalyzed 4,871 COI, 16S, and 28S sequences belonging to the families Coenobitidae, Diogenidae, and Paguridae retrieved from GenBank. Following rigorous quality filtering, 2,450 sequences were retained for downstream analyses to quantify intra and interspecific genetic distances for each family and each molecular marker. The results reveal substantial heterogeneity in genetic divergence across families, with COI and 16S exhibiting broad ranges and frequent overlap between intra and interspecific distances, whereas 28S displayed very low variation consistent with its slower evolutionary rate. Elevated intraspecific distances in several taxa suggest potential cryptic lineages, while unusually shallow interspecific values indicate possible synonymy or recent divergence. Rather than proposing taxonomic changes, this study provides a curated reference framework that establishes empirical distance thresholds for molecular species delimitation in Paguroidea. These findings offer a practical baseline for future research employing COI, 16S, and 28S markers in species identification, validation of public sequence data, and the refinement of hermit crab systematics.
Mechanisms of Vertical Mixing Over the Shelf Region in the Southwestern Arafura Sea Muhammad Raafi; Yuli Naulita; I Wayan Nurjaya; Rastina
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

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

Abstract

Vertical mixing regulates nutrient supply and productivity in surface layer, yet the controlling mechanisms remain unclear. Over shelf regions such as the southwestern Arafura Sea, steep topography and strong semidiurnal tides suggest that internal tide topography interactions may enhance turbulence. Unfortunately, observational links among stratification, topographically driven mixing processes, and internal tides remain limited in this region. This study investigates the dominant mechanisms controlling vertical mixing over the shelf region using hydrographic profiles, indirect turbulent measurements, and internal-tide diagnostics. We examined the stability, water masses, and turbulent kinetic energy dissipation rate (ε) and vertical eddy diffusivity (Kρ) from Thorpe-scale overturns. Internal-tide influence was assessed through M2 ray path modeling and by sampling the M2 tidal envelope at CTD cast times. Results show that the 50-200 m thermocline forms a barrier that suppresses mixing offshore and on the shelf, where Kρ generally remains below 10⁻⁴ m² s⁻¹. Along the slope, weaker stratification at 600-1,000 m supports large overturns and elevated ε (10⁻⁷-10⁻⁸ W kg⁻¹). Ri# indicates weak background shear, while Tu identifies salt-finger–favorable conditions contributing to mid-depth mixing. The spatial alignment between elevated ε and the shifted M2 envelope, consistent with M2 ray path geometry, suggests that internal tides reflected from locally supercritical topography enhance turbulence at the slope. These findings highlight the slope as a focused mixing hotspot. Future work should use moored velocity and high-resolution models to better resolve internal-tide energy pathways and their biogeochemical impacts.
Mapping Shallow Water Benthic Habitats Using High Resolution Multispectral UAV Data: A Case Study of Panggang Island Devi Aliyah Sari; Vincentius P. Siregar; Syamsul Bahri Agus
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.70650

Abstract

The use of Unmanned Aerial Vehicles (UAVs) has become increasingly important for high-resolution remote sensing applications, particularly for mapping coastal and shallow-water environments. Benthic habitats in shallow marine environments include seagrass meadows, macroalgae, live coral reefs, and degraded coral communities associated with sandy, muddy, and coral rubble substrates. This study mapped benthic habitats on Panggang Island, Indonesia, using multispectral imagery acquired by a DJI Phantom 4 Multispectral UAV with a spatial resolution of 6 cm per pixel. Seven benthic habitat classes were identified; sand , seagrass, live coral, dead coral with algae, coral with algae, rubble, and macroalgae. Habitat classification was performed using a pixel-based Support Vector Machine (SVM) algorithm. Classification accuracy was evaluated using a confusion matrix, yielding an overall accuracy of 87% and a Kappa coefficient of 0.84 The results demonstrate that integrating high-resolution UAV multispectral imagery with pixel-based SVM classification provides an effective approach for detailed benthic habitat mapping in small-island shallow-water environments.
Economic Value of Coastal Resources based on Ecotourism Activity in the Sanggar Beach, Tulungagung Amalia Febryane Adhani Mazaya; Agrilina Pramesthi Dua; Pribadi Elrika Wafa Sabrina; Nurkhasanah Anissa Aprilia; Rini
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.71039

Abstract

This study was conducted to calculate the economic value of coastal resources based on ecotourism activities at Sanggar Beach, Tulungagung, East Java, Indonesia. As a turtle nesting habitat and tourist destination, Sanggar Beach offers ecological and economic value. However, economic values such as non-market benefits are often overlooked in tourism assessments. In fact, economic assessment is one of the inputs for sustainable coastal tourism destination management. Therefore, a mixed approach was used with a decision tree model to describe tourist characteristics, the Travel Cost Method (TCM) to analyze tourism demand, Principal Component Analysis (PCA) to describe the relationship between demographics and tourism demand, and consumer surplus analysis to calculate economic value. Data were collected from 30 tourists selected purposively through a structured questionnaire. The results show that travel costs, age, education, and income are predictors of tourism demand with the age being a ignificant predictor. The decision tree model further showed that older visitors reported higher levels of satisfaction, while younger groups were more influenced by socioeconomic factors. PCA revealed that the first two components explained 73,9% of the total variance, simplifying the analysis of visitor characteristics. Consumer surplus was estimated at IDR 64.016 per visitor, with the economic value of tourism activities projected at around IDR 18,064,987,438.00 per year. These results indicate that the indirect benefits of conservation areas can be considered in supporting sustainable ecotourism strategies, such as determining entrance fees and area incentives.
Habitat-Driven Differences in Fish Assemblages Caught by Traditional Bubu Traps in Kapota Atoll, Wakatobi National Park, Indonesia Sri Pujiyati; Julia Eka Astarini; Steven Solikin; Baigo Hamuna; Efi Noferya Manafi; Muhammad Musrianton; Firman Rusdin; Safirudin Safirudin
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.71307

Abstract

Bubu are traditional passive fishing traps made from natural materials such as bamboo and are widely used in coral reef fisheries due to their low impact on benthic habitats. This study examines the diversity and community structure of fish associated with different benthic habitats in Kapota Atoll, Wakatobi National Park, Indonesia. Five bamboo traps (88 × 78 × 32 cm) were deployed at five stations representing four habitat types: coral, sand, coral rubble, and seagrass. To minimize fish avoidance, traps were initially left in place for 48 hours to allow odors from new bamboo to dissipate. After this period, traps were retrieved to collect the catch and then redeployed. Sampling was conducted twice. A total of 92 individuals representing 25 species from 14 families were recorded. Ecological indices indicated moderate diversity (H' = 1.277-2.094), high evenness (E = 0.778-0.921), and low dominance (D = 0.141-0.306). Correspondence analysis explained 64.6% of the species–habitat relationship (Axis 1: 36.02%; Axis 2: 28.58%) and identified three assemblages associated with sand/coral/rubble habitats, shallow seagrass (3 m), and deeper seagrass (8 m). Overall, the results indicate that bubu traps are effective for capturing fish diversity across different benthic habitats and can provide useful ecological information for fisheries management, despite their relatively limited sampling area.
Seafloor Morphology and Bathymetric Data Quality Evaluation Around Panjang Island, Banten Bay Steven Solikin; Sri Pujiyati; Dwi Yuni Wulandari; Tri Ariyah Hari Saputra; Umar Darlan; A-Liem; Ardella Insya Firmanti
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 1 (2026): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.18.1.71510

Abstract

Gathering accurate bathymetric data in shallow coastal waters proves to be difficult due to the environmental issues and operational constraints, especially in a semi-enclosed water like Banten Bay. This research intends to examine the seafloor morphology, in addition to assessing the quality of hydrographic data acquired through the use of single-beam echosounder (Odom Echotrac CV100) around Panjang Island Waters. The main line and cross line surveys of the survey were carried out using RTK-GNSS positioning and tidal corrections using 30 day observations relative to mean sea level. The bathymetric data show a gradual depth transition from 8 m nearshore to more than 20 m offshore. Ridges and basins are evident in the data indicating spatial variability. According to the results of a data quality assessment based on the IHO S-44 standard, 94.07% of data belonged to Order 2, 76.67% to Order 1a/1b, 56.30% to Special Order and 38.52% to Exclusive Order with data errors below 7%. As the above results suggest, the general hydrographic mapping by the dataset is of reliable accuracy, which does not achieve highest accuracy consistently. The study’s main contribution is the demonstration of performance and practical limitations of single beam echosounder surveys in shallow water environment with a quantification of data quality compared to IHO standard. This study provides a validated methodology for low-cost bathymetric mapping of other similar semi-enclosed coastal water.

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