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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 680 Documents
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Reef Fish Biodiversity and Behavior in The Seribu Islands of Jakarta, Indonesia Arta Silaban; Neviaty Putri Zamani; Nyoman Metta N Natih; Dondy Arafat; Inna Puspa Ayu; Beginer Subhan
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.71330

Abstract

Coral reef ecosystems are centers of biodiversity with high productivity in tropical waters; however, information on reef fish communities and their behavioral interactions with coral colonies in the Seribu Islands remains limited. This study aimed to identify reef fish species, coral genera utilized by reef fishes, and variations in reef fish behavior associated with coral colony structures. An Underwater Video Survey (UVS) was conducted using systematic underwater video recordings at Panjang, Pelangi, Belanda, and Kelapa Islands, Jakarta, Indonesia. The Videos were analysed to identify reef fish species, coral genera, and behavioural patterns associated with coral colonies. A total of 215 reef fish species belonging to 82 genera and 29 families were identified across the study sites. Kelapa Island exhibited the highest species richness (120 species), followed by Belanda Island (119 species) and Panjang Island (107 species), while Pelangi Island showed the lowest richness (83 species). Sixteen coral genera were recorded, with Acropora and Porites being the most dominant and occurring at all study sites. In contrast, Cyhastrea, Echinophyllia, Echinopora, Monstastraea, Platygra, and Pocillopora were restricted to a single location. Acropora and Porites also supported the highest numbers of associated reef fish species. A total of 13 behavioural categories were observed. Feeding, roaming, and hovering were the dominant behaviours across all study sites, whereas cleaning, resting, ambush, and aggressive behaviours were less frequent. Variations in behavioural patterns among islands suggest that complexity influences both reef fish diversity and behavioural expression. These findings highlight the importance of structurally complex coral habitats in supporting reef fish diversity and ecological functions in the Seribu Islands.
Prediction of Potential Fishing Zones Based on Upwelling in The Southern Part of Palabuhanratu Bay Rivaldi Abdul Rasyid; Prof. Dr. Ir. Domu Simbolon, MSi Simbolon; Am Azbas Taurusman
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.71574

Abstract

Fishing-ground estimation is commonly conducted using catch-based analysis. However, this approach has not consistently produced accurate estimates. Upwelling offers an alternative approach because it influences the variability of oceanographic parameters, which, in turn, affect fish distribution and the dynamics of fishing grounds. This study aimed to (1) identify upwelling-favorable conditions based on the combined variability of SST, chlorophyll a, salinity, and SLH, and (2) predict potential fishing zones associated with upwelling in the southern waters of Palabuhanratu Bay. Satellite derived SST, chlorophyll a, salinity, and SLH data were integrated to estimate the location and timing of upwelling, while catch and fishing effort data from trolling line fleets were used to calculate fishing productivity. The results showed that upwelling occurred predominantly from July to November and was characterized by decreased SST (24.21–29.56°C), increased chlorophyll-a concentration (0.07–0.76 mg/m3), elevated surface salinity (32.91–34.49‰), and persistent negative SLH anomalies (0.19–0.67 m). Upwelling events were more frequent and intense in coastal waters than in offshore areas. Locations and periods with higher upwelling frequency consistently exhibited higher catch per unit effort (CPUE). Statistical analysis revealed a significant relationship between upwelling and catch productivity (r = 0.570; F = 3.854; p < 0.05). During the upwelling period, CPUE in potential fishing zones reached 759–1,067 kg/trip, while CPUE in coastal upwelling areas reached 658–749 kg/trip, exceeding the cumulative CPUE of 643 kg/trip. Integrating oceanographic indicators with fisheries data enhances fishing-ground prediction and ecosystem-based fisheries management.
Hydroacoustic Analysis of Pelagic Fish Aggregation Around Fish Aggregating Devices (FADs) in Maluku Sea Ramadhini Zulfa Alwafia; Sri Pujiyati; Angga Dwinovantyo; Steven Solikin; Widhya Nugroho Satrioajie
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.71642

Abstract

The Maluku Sea is a body of water with considerable potential in terms of the fisheries sector. Several fish aggregations are located in the Maluku Sea that are being checked using a Simrad EK-15 single beam echosounder with a frequency of 200 kHz kHz using the hydroacoustic method to record fish echoes. The hydroacoustic method provides information in the form of echoes from fish groups or fish volume. The backscattering strength (SV) is distributed around the fish aggregating device. This study aims to detect the presence of pelagic fish using hydroacoustic technology in the form of backscatter values and to analyze the relationship between pelagic fish SV and temperature, salinity, and currents around fish aggregating devices in the Maluku Sea. Fish aggregating devices in the Maluku Sea are dominated by small pelagic fish with fish aggregating device constructions reaching 70 meters below the water surface, there are buoys tied with floating ropes and artificial attractors such as palm fronds and weights. The temperature profile is around 29.73 – 26.85 °C, salinity ranges from 34.4 to 34.9 PSU, and the current speed is 0.2 meters per second. The distribution of fish SV values in the three fish aggregating devices was at a depth of 5 to 20 meters with SV values ranging from -46.53 to -52.91 dB, indicating that the fish aggregating devices greatly influenced the distribution of pelagic fish that tend to gather and follow the presence of attractors in the fish aggregating devices. 
Coral Disease Prevalence in the Western Lombok Waters Farrel Rizky Fahrezy; Imam Bachtiar; Nurliah Buhari
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.71807

Abstract

Coral disease is one of the major threats to coral mortality, leading to severe degradation of coral reef ecosystems. Several studies on coral disease have been conducted in Indonesia; however, coral disease prevalence in Lombok waters remains unknown. This study aims to identify coral diseases, quantify their prevalence, and examine their relationships with coral reef covers. Two data collection methods used were the belt transect method for coral disease observation and underwater photo transect for benthic substrate cover assessment. Four types of coral diseases were identified: ulcerative white spots (UWS), pigmentation response (PR), white syndrome (WS), and white pox (WP). Additionally, two types of coral health disorder caused by other organisms were found, namely coralliophila and tube formers. The overall coral disease prevalence was 10.2±0.18% (± SE), while coral health disorder prevalence reached 6.0±0.62%. Coral diseases were only found in the massive corals: Astreopora, Cyphastrea, Favia, Goniastrea, and Porites. The condition of coral reefs was classified as moderate (fair), and coral diseases were distributed homogenously among sites. There were neither significant correlation between coral reef covers and coral disease prevalence, nor between coral reef covers and coral health disorder prevalence. Coral disease prevalence was more related to sponges and soft corals covers, while coral health disorder prevalence was more closely related to hard corals and rubble covers. The results suggest that coral disease is concerning in Lombok waters, and regular long-term monitoring coral diseases is required to achieve the sustainable development goal life below water.
Pemodelan Dispersi Thermal plume dan Hubungannya dengan Struktur Komunitas Plankton di Perairan Pesisir Lombok Dietriech Geoffrey Bengen; Nyoman Metta N Natih; Asha Aulia Zahara; I Wayan Nurjaya
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.72607

Abstract

Penelitian ini bertujuan untuk menganalisis pola penyebaran gumpalan termal dan meneliti hubungannya dengan struktur komunitas plankton di perairan pantai Lombok. Penelitian ini menggunakan data pemantauan lingkungan sekunder yang dikumpulkan pada Mei 2025 dan pemodelan numerik dua dimensi menggunakan MIKE 21 untuk mensimulasikan sirkulasi hidrodinamik dan transportasi termal. Struktur komunitas plankton dievaluasi menggunakan indeks keanekaragaman Shannon-Wiener, keseragaman, dan dominasi, sedangkan hubungan antara variabel lingkungan dan plankton dinilai menggunakan korelasi peringkat Spearman dan Analisis Korespondensi. Hasil menunjukkan bahwa penyebaran gumpalan termal terutama dikendalikan oleh arus pasang surut, sirkulasi permukaan, dan angin, menghasilkan massa air hangat yang memanjang sejajar dengan garis pantai dengan suhu tertinggi tetap terlokalisasi di dekat muara. Area gumpalan yang dimodelkan didominasi oleh kelas suhu 30-30,5 °C, meliputi 62,21-66,06 km2 di seluruh fase hidrodinamik, sedangkan zona suhu yang lebih tinggi terbatas secara spasial. Keanekaragaman plankton berkisar antara 1,93 hingga 2,21, keseragaman antara 0,86 hingga 0,96, dan dominasi antara 0,12 hingga 0,17, menunjukkan komunitas yang cukup beragam dan relatif stabil. Suhu tidak berkorelasi signifikan dengan keanekaragaman (r = 0,00; p > 0,05), tetapi menunjukkan hubungan positif yang kuat dengan keseragaman (r = 0,95; p = 0,05). Secara keseluruhan, dinamika komunitas plankton di area penelitian dipengaruhi tidak hanya oleh paparan termal, tetapi juga oleh kondisi nutrisi dan proses hidrodinamika lokal.
Karakteristik Serat Rami Berlapis Polyvinyl Alcohol Senagai Biodegradable Fishing Gear Material Kemal Fasya; Mohammad Imron; Didin Komarudin; Mokhamad Dahri Iskandar
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.72662

Abstract

Ghost fishing refers to the phenomenon of lost synthetic fishing gear in aquatic environments, posing a serious threat to marine ecosystems because these materials are difficult to degrade and continue capturing fish uncontrollably. Synthetic fishing gear has high durability but negatively impacts ecosystems when lost. One alternative to mitigate this issue is the use of biodegradable materials such as ramie fiber. However, ramie rope has drawbacks, including lower breaking strength and limited durability. This study aimed to improve the performance of ramie rope by coating it with polyvinyl alcohol (PVA), which is hydrophilic, biodegradable, and environmentally friendly. The study was conducted by coating 3mm ramie ropes with PVA solution followed by seawater immersion testing for 10 weeks to evaluate changes in mechanical properties and technical service life. The results showed that PVA coating increased the rope’s breaking strength by 38.97% and elongation by 32.59%. In addition, the technical service life of PVA-coated ramie rope was longer (7 months and 1 week) compared to the control rope (5 months and 1 week). These findings indicate that PVA coating can improve the mechanical performance and durability of ramie rope, making it a potential biodegradable material for environmentally friendly fishing gear.
Habitat-associated occurrence of spiny lobster pueruli (Panulirus spp.) in Moramo Bay, Indonesia: Baseline ecological observations Syahrir; Yonvitner Yonvitner; Taryono Taryono; Rahmat Kurnia; Ario Damar
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.73091

Abstract

Indonesia supports one of the world's largest fisheries targeting spiny lobster pueruli (Panulirus spp.) to supply capture-based aquaculture, yet ecological information describing puerulus occurrence in many coastal settlement areas remains scarce. This study presents preliminary ecological observations from Moramo Bay, Southeast Sulawesi, Indonesia, based on standardized artificial pocong collectors deployed at three representative shallow coastal stations characterized by coral–sand mixtures, seagrass beds, and sandy substrates. Because artificial collectors intercept actively swimming pueruli during the transition from the pelagic to the benthic phase, the data represent collector-associated occurrence rather than direct measurements of natural settlement or habitat preference. A total of 319 pueruli belonging to two species were recorded, comprising Panulirus ornatus (79.31%) and P. homarus (20.69%). Collector catches varied among the three representative sampling stations, with the highest abundance observed at the seagrass-associated station. Field observations were interpreted together with satellite-derived mean sea surface temperature (SST) and chlorophyll-a concentration (2022–2024) to characterize the regional oceanographic setting surrounding the sampling area. The spatial variation observed among stations may reflect the combined influence of local habitat setting, coastal hydrodynamics, larval transport processes, and differences in collector exposure rather than habitat characteristics alone. Since each habitat type was represented by a single sampling station, these findings should be interpreted as station-level ecological observations rather than replicated habitat comparisons. Although preliminary, this study establishes an ecological baseline for Moramo Bay and provides a scientific foundation for future investigations integrating replicated habitat surveys, larval connectivity, and oceanographic processes to strengthen evidence-based management of Indonesia's lobster puerulus fisheries.
First Report Molecular Identification and Bioactivity Screening of Razor Clam (Solen sp.) from Merauke, Indonesia Delianis Pringgenies; Ali Ridlo; Ria Azizah Tri Nuraini; Sendy L. Merly; Dafit Ariyanto
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.73270

Abstract

Marine bivalves are increasingly recognized as reservoirs of natural metabolites that may support biotechnological development and functional food innovation. Nevertheless, information on the taxonomic status and biological properties of bamboo clams from eastern Indonesia is still scarce. This research examined the genetic affiliation and preliminary bioactive characteristics of Solen sarawakensis obtained from the coastal area of Merauke, Indonesia. Specimens were collected from the intertidal habitat, followed by molecular characterization based on the mitochondrial cytochrome oxidase I marker. The crude extract was subsequently evaluated for antibacterial properties using an agar disk assay against Staphylococcus aureus and Escherichia coli. Free-radical scavenging capacity was determined using DPPH analysis, while major secondary-metabolite groups were assessed through qualitative phytochemical tests. Sequence comparison and phylogenetic reconstruction placed the Merauke specimens within the S. sarawakensis lineage. The extract inhibited the growth of both tested bacterial species, suggesting activity across Gram-positive and Gram-negative targets. However, its radical-scavenging performance was relatively low, producing an IC₅₀ of 353.52 ppm. Alkaloids, steroids, and saponins were detected in the extract, whereas flavonoids and tannins were absent. These findings document the genetic characterization and initial bioactivity profile of S. sarawakensis from Merauke. Despite modest antioxidant performance, its antibacterial response and detected metabolite classes indicate that this bivalve may warrant further investigation as a natural source of antimicrobial compounds. Purification of active fractions, compound elucidation, and mechanistic evaluation should be pursued in subsequent work.
DNA Barcoding Reveals Frequent Conflicts between Molecular and Morphological Identifications in Wild-Caught Shrimp from Coastal East Kalimantan, Indonesia M Syahrir R; Nurfadillah Nurfadillah; Yadi Yadi; Sabrina Azzahrah; Madinah Tul Quraini; Yuni Syahriani; Meyli Anisa; Umra Umra; Dewi Embong Bulan; Trifan Budi
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.73392

Abstract

Unreliable species identification can hinder management of key fisheries, including shrimp, in Coastal East Kalimantan. This study integrated preliminary morphological identification with COI DNA barcoding to validate species assignments of wild-caught shrimp landed at three coastal sites in East Kalimantan. Wild-caught shrimp from coastal East Kalimantan, were first identified using morphological characters. These identifications were then verified using COI DNA barcoding. Sequences were identified via database percentage similarity in NCBI and BOLD databases, and barcoding gap based on Kimura 2-parameter (K2P) was calculated to assess reliability of molecular species identification. A total of 25 shrimp specimens were morphologically assigned to Penaeidae and Solenoceridae, identifying 16 morphospecies (15 at species level and one assigned only to genus level). DNA barcoding identified three families (Palaemonidae, Penaeidae and Solenoceridae) and 15 species, with sequence similarities ranging from 98.17% to 100% (~99% query cover). In contrast, the BOLD database identified 12 specimens to species level and 12 to genus level with top match similarities ranged from 93.74% to 100%. Morphological and genetic identifications conflicted in 15 specimens and agreed in nine specimens. Genetic distances (K2P) ranged 0.000–0.238 with mean interspecific distance (0.197) exceeded mean intraspecific distance (0.00205). One species (Metapenaeus ensis) showed a negative barcoding gap, suggesting cryptic diversity or misidentification. The partial sequence of COI DNA barcoding supplements morphological shrimp identification, but conflicting results and incomplete databases remain challenges. Building well curated reference sequences is required to close these gaps and enhance the accuracy of species identification. 
Characteristics of Sediment Grain Size in Shallow Waters of Kapota Island and Atoll, Wakatobi Baigo Hamuna; Sri Pujiyati; Jonson Lumban Gaol; Totok Hestirianoto; Alianto Alianto
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 18 No 2 (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.18.2.72360

Abstract

Shallow waters in tropical island and atoll regions are highly dynamic environments where sediment grain size characteristics and distribution are influenced by complex interactions. This research aims to obtain a description of the grain size characteristics of shallow water sediments on Kapota Island and Kapota Atoll, Wakatobi. Shallow water sediment samples were collected using a core pipe at 14 observation stations representing both study locations. Sediment grain size analysis was performed using the dry sieving method, while the fraction composition, sediment texture, and statistical parameters were determined with the aid of Gradistat software. The analysis results show that the shallow water sediments at both locations are composed of three main fractions: gravel (1.20–44.55%), sand (54.91–98.21%), and silt (0.01–10.50%). Texturally, sediments are classified into four types: sandy gravel, gravelly sand, slightly gravelly sand, and slightly gravelly muddy sand. The statistical parameter values indicate a mean grain size range from very coarse to very fine sand, a sorting level from moderately sorted to very poorly sorted, a skewness value from symmetrical to strongly skewed toward the coarse fraction, and a kurtosis from very flat to very peaked. Generally, there are no significant differences in the grain size characteristics of sediments between Kapota Island and Kapota Atoll, except for the sediment texture distribution pattern and the shape of the kurtosis curve. These results confirm that the sedimentation dynamics at both locations are relatively similar and provide an important basis for understanding deposition processes and managing the shallow water environment in Wakatobi.

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