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Ronal Kurniawan
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Science, Technology, and Education Care (STEDCA) Address: Jl. Garuda II No.2, Kel. Labuh Baru Timur, Kec. Payung Sekaki Kota Pekanbaru, 28292 Indonesia
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South East Asian Marine Sciences Journal
Published by Science, Technology and Education Care
ISSN : -     EISSN : 30262348     DOI : https://doi.org/10.61761/seamas
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science
South East Asian Marine Sciences Journal (SEAMAS) is professionally managed and published by Science, Technology, and Education Care to help academics, researchers, and practitioners to publish their research results. South East Asian Marine Sciences Journal (SEAMAS) is a journal dedicated to the publication of quality research results in all aspects of marine science and is free of charge in the Submission Process. All publications in SEAMAS journals are open-access, allowing articles to be freely available online without subscription.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 30 Documents
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Construction and Design of the Dragon Trap in Insit Village, Tebing Tinggi Barat District, Kepulauan Meranti Regency, Riau Silitonga, Ido Maruli; Nofrizal, Nofrizal; Yani, Alit Hindri
South East Asian Marine Sciences Journal Vol. 3 No. 1 (2025): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.1.33-38

Abstract

This study aims to examine the construction and design of dragon traps used by fishermen in Insit Village, Tebing Tinggi Barat Sub-district, Meranti Islands Regency, Riau Province. Dragon traps are passive and environmentally friendly fishing gear that have only been used since 2022, primarily targeting shrimp, with bycatch including fish and crabs. The research was conducted over two weeks from August 26 to September 9, 2024, using survey and field observation methods. Data were collected through direct measurements of the fishing gear, interviews with fishermen, and visual documentation. The results showed that the dragon traps have a total length of 15 meters, with the main structure consisting of 36 galvanized iron frames. The trap body is made of polyethene (PE) netting with a mesh size of 0.5 inches, measuring 40 cm in length, 45 cm in width, and 30 cm in height. It has 32 entry holes (ijep) arranged alternately. Other components include two catch-holding chambers measuring 50 cm in length, 38 cm in width, and 25 cm in height, PE binding ropes, and 5-meter-long stakes. The fishing location is in shallow, muddy waters with a depth of 2–3 meters and approximately 150 meters from the shoreline. During the study, the dragon traps caught 120 kg of white shrimp (Penaeus merguiensis) out of a total catch of 149 kg. This indicates that the bubu naga is quite effective in capturing shrimp as its main target species.
Sustainability Status of Gillnet Capture Fisheries Based on Economic, Ecological, Technological, Institutional, and Social Aspects in Panipahan Pasir Limau Kapas Sub-District Rokan Hilir District Simanjuntak, Jeremi Nichola; Brown, Arthur; Zain, Jonny
South East Asian Marine Sciences Journal Vol. 3 No. 1 (2025): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.1.9-18

Abstract

Rokan Hilir Regency, particularly Pasir Limau Kapas District, has significant potential for capture fisheries. However, ecosystem sustainability depends on high-value fish resources such as senangin and mackerel. Therefore, a sustainable study of fisheries management is needed based on ecological, socioeconomic, community, and institutional dimensions to ensure the sustainable use of fish resources. This research evaluates the sustainability status of gill net capture fisheries in Panipahan, Pasir Limau Kapas District, Rokan Hilir Regency, based on five dimensions: economic, ecological, technological, institutional, and social. The analysis method used is Rapid Appraisal for Fisheries (RAPFISH) with a Multidimensional Scaling (MDS) approach. The results show that the institutional dimension had the highest sustainability index at 92.08%, classified as "sustainable", while the technological dimension had the lowest index at 39.87%, indicating a "less sustainable" status. The economic and social dimensions scored 53.11% and 57.75% respectively, categorised as "moderately sustainable", whereas the ecological dimension scored 43.96%, also "less sustainable". These findings indicate that gill net capture fisheries in Panipahan are not yet fully sustainable, particularly regarding technology and ecology. Therefore, there is a need to enhance environmentally friendly fishing gear use, strengthen local institutional regulations, and increase public education and community involvement to support sustainable fisheries resource management
Behavioral Response of African catfish (Clarias gariepinus) to Electrical Flow in an Electrofishing Gear Azizah, Novia Rahmatul; Nofrizal, Nofrizal; Yani, Alit Hindri
South East Asian Marine Sciences Journal Vol. 3 No. 1 (2025): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.1.1-8

Abstract

African catfish are a species of fish commonly found in various aquatic environments. Fishermen employ diverse methods to catch fish in seas, rivers, and swamps, utilizing eco-friendly and non-eco-friendly tools. One such tool is electrofishing. Fish behavior is influenced by their ability to adapt to their environment. One observable aspect is the African catfish's swimming patterns and endurance in a research pond. This study was conducted in April 2024 at the Fishing Gear Materials Laboratory, Department of Aquatic Resource Utilization, Faculty of Fisheries and Marine Sciences, Universitas Riau. The research utilized an experimental method, with data collected directly in the Laboratory. African catfish were used as test subjects with a 12-volt electric fishing gear. The results showed that at a treatment distance of 30 cm, the fish required an average of 3,5 seconds to respond to the electric current. The use of electrofishing gear has been proven to cause negative physiological responses, including fainting, external injuries, and mucus release in African catfish, which has implications for the sustainability of the African catfish population. After electrofishing, the condition of the fish showed injuries and fin loss on their bodies, resulting in some fish dying during recovery, although the number of dead fish was fewer than the number of surviving fish
Bioactive Potential of Marine Biota (Algae, Sponges, and Marine Bacteria) as a Source of Antimicrobial Compounds Wahyuni, Sri; Mursawal, Asri; Kurniawan, Ronal
South East Asian Marine Sciences Journal Vol. 3 No. 1 (2025): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.1.19-26

Abstract

Antimicrobial resistance has become one of the most serious global health threats, prompting the search for new natural sources of antibiotics. Marine biota, such as algae, sponges, and bacteria, are known to produce a variety of secondary metabolites with potential biological activity, particularly as antimicrobial compounds. This review article examines the bioactive potential of these marine biota as an alternative source of natural antibacterial compounds. The study was conducted by reviewing various international and national literature related to the bioactive metabolites produced, their mechanisms of action against pathogenic bacteria, and the potential for their use in developing new antibacterial agents. The results of the review indicate that sulfated polysaccharides, terpenoids, alkaloids, and phenolic compounds from algae; alkaloids, cyclic peptides, and terpenoids from sponges; and secondary metabolites of marine symbiont bacteria have significant antibacterial activity, including against antibiotic-resistant bacteria. However, the development of marine bioactive compounds still faces various obstacles, particularly related to isolation techniques, mass production, and environmental sustainability issues. Therefore, modern biotechnological approaches, such as genomics, metabolomics, and synthetic biology, are needed to optimize the utilization of these marine resources. This article confirms that marine biota are important candidates for the development of new, sustainable antibacterial agents and have the potential to support the strengthening of the blue economy concept.
Morphometric Analysis of Ponyfish (Leiognathus daura) Landed at the PPI Cituis, Tangerang, Banten Mursawal, Asri; Ruzanna, Arina; Wahyuni, Sri
South East Asian Marine Sciences Journal Vol. 3 No. 1 (2025): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.1.27-32

Abstract

Leiognathus daura is a small pelagic fish that plays an important role in coastal ecosystems and has economic value for local communities. This study aimed to analyze the length–weight relationship, condition factors, and morphological characteristics of L. daura as a basis for fisheries biology information. A total of 30 specimens were examined morphometrically and meristically. The length–weight regression produced the equation y = 0.9073x + 0.2776 with a coefficient of determination (R²) of 0.2595. The value of b = 0.9073 (< 3) indicates a negative allometric growth pattern, meaning that length increases faster than body weight. Condition factors showed a Fulton's K value of 3.8036 and a relative condition factor (Wr) of 101.0081, suggesting that the fish population is healthy and supported by a favorable aquatic environment. Morphologically, L. daura has a laterally compressed body, small terminal mouth, large eyes, silvery scales, and a forked caudal fin, all of which support schooling behavior and adaptation to shallow coastal waters. The low R² value implies that body weight is influenced by length and environmental conditions, food availability, reproductive status, and fishing pressure. These findings highlight the importance of understanding the biological aspects of L. daura as a foundation for sustainable fisheries management in coastal ecosystems
Scoping Review on Microplastic Pollution in Aquatic Species Across Indonesian Waters Marikar, Ashiba; Ádám, Balázs
South East Asian Marine Sciences Journal Vol. 3 No. 2 (2026): March
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.2.39-51

Abstract

Microplastics (MP) pollution is an emerging environmental threat in aquatic ecosystems, with implications for both biodiversity and human health. As one of the world’s largest archipelagic nations and a top contributor to marine plastic waste, Indonesia faces significant challenges related to MP contamination in its waters. This scoping review aims to map existing evidence on MP pollution among aquatic species in Indonesian waters. A comprehensive search was conducted in the PubMed database between April and May 2025, guided by the Population-Concept-Context framework. The review followed the PRISMA-ScR guidelines. Studies were included if they addressed MP pollution in aquatic organisms in Indonesia and were published in English. Data were extracted systematically, covering study characteristics such as MP types, sizes, shapes, colors, polymer composition, and detection methods. A total of 13 eligible studies were included. These studies examined MP contamination in various aquatic organisms, including fish, bivalves, sea urchins, and sandfish across freshwater, coastal, and aquaculture environments. Predominant MP shapes were fibers, fragments, and films, with sizes ranging from <100 µm to 5000 µm. The most frequently detected polymers were polyethylene, polypropylene, polystyrene, and polyvinyl chloride. Black was the most common color of MP, followed by blue. Filter feeders and species near polluted areas showed higher MP loads. The diversity in MP color, size, and polymer composition reflects a mix of land- and marine-based pollution sources. Differences in detection and limited health-impact data highlight the need for more consistent, in-depth research, emphasizing standardized protocols and further studies assessing biological and health impacts. This review points out the widespread presence of MP in aquatic species consumed by humans, raising significant concerns for seafood safety and environmental health in Indonesia. These findings highlight the urgent need for standardized analytical protocols and strengthened regulatory measures to address MP pollution, positioning it as an emerging environmental health priority in Indonesia.
Phytochemical Analysis of Mangrove Leaf Extract Lumnitzera racemosa as a Potential Source of Bioactive Compounds Fakhrurozi, Fakhrurozi; Effendi, Irwan; Nursyirwani, Nursyirwani; Kurniawan, Ronal
South East Asian Marine Sciences Journal Vol. 3 No. 2 (2026): March
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.2.52-55

Abstract

This study was conducted to identify the secondary metabolite prile in the leaf extract of Lumnitzera racemosa, which has potential as a natural antibacterial agent. Leaf samples were collected from the mangrove area of Pecinta Alam Bahari (PAB), Dumai City, and extracted with 96% ethanol using a maceration method. Phytochemical tests were conducted qualitatively on seven groups of compounds, namely alkaloids, flavonoids, phenolics, saponins, tannins, triterpenoids, and steroids. Analysis revealed the presence of flavonoids, phenolics, and triterpenoids, while alkaloids, saponins, tannins, and steroids were not detected. The identified compounds have different antibacterial mechanisms but are effective in disrupting the structure and function of bacterial cells. These findings suggest the potential of L. racemosa leaf extract as a source of bioactive compounds for health and aquaculture applications.
Genetic Diversity of Decapoda in the Indo-Pacific Region: A Literature Review Kurniawan, Ronal; Syuhada, Nur Ikhlas
South East Asian Marine Sciences Journal Vol. 3 No. 2 (2026): March
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.2.67-73

Abstract

The Indo-Pacific region is the global center of marine biodiversity, home to more than 30% of the world's marine species. The order Decapoda, which comprises more than 17,000 species, plays significant ecological and economic roles in this region. This literature review aims to synthesize current knowledge on the genetic diversity and population structure of Decapoda in the Indo-Pacific and to identify the factors influencing these patterns. Molecular studies employing genetic markers such as mitochondrial DNA (mtDNA), microsatellites, and genomic sequencing indicate that Indo-Pacific Decapoda populations generally exhibit high haplotype diversity with relatively low nucleotide differentiation. Several factors, including larval dispersal capability, the duration of the planktonic phase, geographic and oceanographic barriers, and local adaptation to environmental conditions, shape population structure. Anthropogenic activities, particularly overexploitation, have led to declines in effective population size and genetic erosion in several commercially important species, such as Penaeus monodon and Scylla serrata. This review highlights the importance of integrating genetic data into sustainable fisheries management, including ecosystem-based stock assessment, periodic genetic monitoring, and the incorporation of genetic considerations in aquaculture and restocking programs to ensure the long-term sustainability of Decapoda populations in the Indo-Pacific region.
Isolation of Antibiotic-Producing Microorganisms from Camponotus melanus in the Mangrove Ecosystem against Pathogenic Bacteria Yulinda, Three; Effendi, Irwan; Zulkifli, Zulkifli; Nursyirwani, Nursyirwani; Batubara, Ummi Mardhiah
South East Asian Marine Sciences Journal Vol. 3 No. 2 (2026): March
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.2.56-61

Abstract

Microorganisms that live in extreme conditions in mangrove ecosystems have unique defence mechanisms that enable them to produce secondary metabolites that function as antibiotics. One of them is the wood ant (Camponotus melanus), which is commonly found in mangrove ecosystems and plays a significant role in these ecosystems. This study aims to identify bacteria associated with C. melanus based on morphological characteristics and biochemical tests, and to test their antibacterial activity against pathogenic bacteria (Aeromonas hydrophila, Pseudomonas aeruginosa, and Staphylococcus aureus). This study was conducted from September to November 2025. The method used was a survey method. The research was conducted from September to November 2025. C. melanus samples were taken from the Marine Station mangrove forest, Dumai City, Riau Province, and analyzed at the Marine Microbiology Laboratory, Faculty of Fisheries and Marine, Universitas Riau. The isolation and identification results yielded three bacterial isolates: C1 and C2, suspected to be Bacillus sp., and C3, suspected to be Citrobacter sp. The antibacterial activity test results of the three isolates produced inhibition zones. This indicates that the three isolates have the potential to serve as sources of promising antibiotic compounds for further development
Tsunami Ready Community Facilitator Certified Internship at the Banjarnegara Geophysical Station Atthoriq, Fawwaz; Rizvi, Fharisa Nabila; Kurniawan, Ronal; Karsih, Okta Rizal
South East Asian Marine Sciences Journal Vol. 3 No. 2 (2026): March
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.3.2.62-66

Abstract

Cilacap Regency is one of the regencies that serves as a disaster supermarket/laboratory. This means that Cilacap is at risk of disasters, including earthquakes, floods, landslides, and tsunamis. The objective is to assess community preparedness, specifically in the villages of Banjarsari and Nusawungu, and to prepare for earthquakes and tsunamis involving all components of society, both the government and the community itself, to achieve zero victims. This research was conducted from August to December 2023. Observations were made at the Banjarnegara Geophysical Station on Jalan Raya Banjarmangu Km. 12, Kalilunjar Village, Banjarmangu District, Banjarnegara Regency, Central Java. The method used in model the earthquake source mechanism was the P-wave first-impulse. The input to this system was waveform data from the InaTEWS network, which was entered via the internet using the Seedlink Protocol and then processed to enable automatic picking. The results were then used as input to determine the earthquake parameters and source mechanism in just a few seconds. Lightning observations are conducted using real-time recordings of atmospheric electrical events by the Lightning/2000 software, which are recorded in the format of atmospheric electrical event reports for one day, calculated from 00:00 to 24:00 local time. This is used to archive lightning event data for further processing in lightning mapping. The Tsunami Ready Community is a program to enhance community capacity in facing tsunami threats based on 12 indicators established by UNESCO-IOC. The hope is that the community will always be prepared and not be caught off guard in facing earthquake and tsunami threats

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