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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 5 Documents
 1 
Search results for , issue "Vol. 3 No. 2 (2026): March" : 5 Documents clear
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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