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Munawar Khalil
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joms@unimal.ac.id
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Department of Marine Science, Universitas Malikussaleh. Jl. Universitas, Reuleut Main Campus, North Aceh, Province of Aceh, 24351, Indonesia.
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Journal of Marine Studies
Published by Universitas Malikussaleh
ISSN : -     EISSN : 3047406X     DOI : https://doi.org/10.29103/joms.v1i1
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Environmental Science
Journal of Marine Studies (JoMS) is an international peer-reviewed, open-access scientific journal dedicated to publishing novel research articles, critical-review articles, case studies, short communications, methodological advances, and data papers on all aspects of the marine environment that contribute to systematic knowledge of ocean system and the impact of human activities on them, vice versa. JoMS publishes high-impact scientific articles across the extensive spectrum of marine science, technology and integrated studies (listed on focus and scope). JoMS has a definite aim to distribute a high-quality scientific journal with free Internet-based access for researchers, stakeholders, and other interested people throughout the globe. Journal of Marine Studies publishes original research articles, opinion essays, case reports, short communications, and critical reviews on all aspects of the marine environment. JoMS publishes scientific articles across the extensive spectrum of the marine sciences, including: Oceanography Marine biotechnology Marine biodiversity and living resources Marine geographic information system and remote sensing Marine geology marine pollution Marine fisheries Mariculture Marine genomic Marine policy and law Marine management and conservation Marine technology Marine climatology Marine paleontology Coastal and estuarine dynamic Marine socio-economic Marine modelling Related topics constitute the key elements of papers Integrated studies that link gaps between marine science disciplines
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Oseanografi
Articles 5 Documents
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Search results for , issue "Volume 2, Issue 1 (March, 2025)" : 5 Documents clear
Coral gardening in a changing climate: Rapid assessment of the 4th recorded bleaching event at the Anantara Lagoon and reef system, South Male Atoll, Maldives Migliaccio, Oriana
Journal of Marine Studies Volume 2, Issue 1 (March, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i1.19332

Abstract

Coral reefs are crucial to marine biodiversity and provide essential ecosystem services, but they face severe threats from climate change, particularly through coral bleaching events. The Maldives, renowned for its diverse coral reefs, has experienced increasing coral bleaching incidents, impacting both marine biodiversity and the tourism-dependent economy. This study investigates the effects of the 2024 coral bleaching event on coral nurseries within the Anantara Lagoon and reef system, South Male Atoll, Maldives. Monitoring was conducted across two coral nurseries in the lagoon and one coral nursery on the natural reef, focusing on species-specific responses to bleaching, predation, and survival rate. Results revealed variability in bleaching impacts among species and locations. Acropora aspera and Acropora muricata exhibited high mortality rates and increased predation, particularly at greater depths (~5 m), while Montipora digitata, Pocillopora damicornis, and Porites cylindrica showed greater resilience. The findings highlight the importance of adaptive management strategies for coral nurseries, emphasizing real-time environmental monitoring and strategic nursery placement to bolster coral reef resilience. This study underscores the need for integrated approaches combining coral restoration with broader reef management practices to enhance ecosystem recovery and sustainability.
Characterization of marine debris at Bluka Teubai Beach, North Aceh, Indonesia: Composition, density, and temporal patterns Imamshadiqin, Imamshadiqin; Andika, Yudho; Syahputra, Andika; Erniati, Erniati; Salmarika, Salmarika
Journal of Marine Studies Volume 2, Issue 1 (March, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i1.19487

Abstract

Marine debris consists of materials discarded or unintentionally introduced into the marine environment by human activities. The increasing volume of marine debris is largely attributed to human activity near coastal areas. Bluka Teubai Beach, North Aceh, a popular visitor destination, has a high potential for waste accumulation. This study, conducted in May 2024, employed a purposive sampling method to assess marine debris. The research area was divided into three stations with distinct characteristics, using the line transect method. Results from Bluka Teubai Beach identified two primary waste categories: organic and inorganic. Organic waste included wood, bamboo, and coconut husk, while inorganic waste consisted of plastic, glass, metal, and rubber. Among organic waste, wood exhibited the highest absolute density (0.456 items/m²) and relative density (53.950%), followed by bamboo (0.317 items/m², 39.641%) and coconut husk (0.049 items/m², 6.409%). The overall density of organic waste at Bluka Teubai Beach was highest for wood (0.23 items/m²), with an average relative density of 58.640%. For inorganic waste, plastic had the highest absolute density in pieces (2.24 items/m²) and relative density in pieces (96.968%). The highest absolute density and relative mass of inorganic waste were also found in plastic (99.94 g/m² and 64.36%, respectively). Temporal analysis revealed that organic waste accumulation peaked on Fridays, while inorganic waste was most abundant on Tuesdays in terms of count and on Sundays in terms of mass. The results underscore the urgent need for targeted waste management strategies and continuous monitoring to mitigate marine debris pollution and protect the coastal ecosystem of Bluka Teubai Beach.
Optimizing the reproductive performance of clownfish Amphiprion percula: Effects of artificial substrates on spawning, fertilization, and hatchability in captive breeding Iftahuddin, Iftahuddin; Muliani, Muliani; Zulfikar, Zulfikar
Journal of Marine Studies Volume 2, Issue 1 (March, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i1.21045

Abstract

The increasing demand for marine ornamental fish, particularly Amphiprion percula, has raised concerns about sustainability due to the heavy reliance on wild-caught specimens. Captive breeding programs offer a viable alternative; however, reproductive success varies significantly depending on the artificial substrates used. This study examines the effects of different substrate types on spawning duration, fertilization rate, and egg hatchability in A. percula under controlled aquaculture conditions. A completely randomized design was implemented, testing four substrate types”cobek (earthenware, control), PVC pipes, ceramic pieces, and asbestos sheets”with three replicates each. Broodstock were maintained in optimized water quality conditions, with regular monitoring of feeding regimes and spawning behavior. The results demonstrated that substrate type significantly influenced reproductive parameters. The shortest spawning interval was observed in the cobek treatment (7 days), while the longest was recorded in the asbestos treatment (32.67 days). Fertilization rates ranged from 96.67% in the cobek treatment to 93.42% in the PVC pipe treatment. Notably, the hatchability of fertilized eggs remained consistently at 100% across all treatments, suggesting that artificial substrates do not compromise embryonic development. Water quality parameters were maintained within optimal ranges throughout the experiment, ensuring a stable rearing environment. This research contributes to the improvement of captive breeding practices, reducing dependency on wild populations and supporting the sustainable trade of marine ornamental fish. Future studies should explore additional factors influencing breeding success, including environmental cues and broodstock conditioning, to further refine aquaculture methodologies.
Biometric characteristics of eel Anguilla bicolor in Krueng Sawang River, North Aceh, Indonesia Mulyadi, Mulyadi; Zulfikar, Zulfikar; Khalil, Munawar
Journal of Marine Studies Volume 2, Issue 1 (March, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i1.21108

Abstract

Eels are a valuable economic resource in both local and international markets due to their high nutritional content, particularly their rich vitamin and micronutrient profile. However, their populations face increasing threats from overfishing and habitat degradation, necessitating a deeper understanding of their distribution, growth patterns, and ecological characteristics. This study aimed to identify eel (Anguilla bicolor) species inhabiting the Krueng Sawang River, analyze their length-weight relationships, and assess biometric variations among different sampling locations. Fieldwork was conducted in April and May 2018 across three sampling stations in North Aceh District: Tanoh Anoe (Station 1), Gle Dagang (Station 2), and Babah Krueng (Station 3). A total of 100 eels were collected, with individuals from Station 1 averaging 50.17 cm in length and 237.78 g in weight, those from Station 2 averaging 31.96 cm in length and 135.93 g, and specimens from Station 3 averaging 35.18 cm in length and 148.21 g. Morphological analysis confirmed that all collected specimens belonged to A. bicolor, indicating a homogeneous population within the river system. The length-weight relationship analysis revealed a negative allometric growth pattern, suggesting that increases in length outpace weight gain. These findings provide valuable insights into the population dynamics of A. bicolor in North Aceh, offering essential baseline data for future conservation efforts and the development of sustainable fisheries management strategies.
Microplastic contamination in pelagic fishes from the east coast of Peninsular Malaysia Nawawi, Ain Waznin Nuha Ahmad; Ezraneti, Riri; Miskon, Mohd Fuad; Mohamed, Juliana
Journal of Marine Studies Volume 2, Issue 1 (March, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i1.21125

Abstract

Microplastic contamination in marine environments is a growing concern, particularly in fish species consumed by humans. This study investigates the presence and characteristics of microplastics in the livers of Indian mackerel (Rastrelliger kanagurta) and yellowtail scad (Atule mate) collected from Pahang and Kelantan. The abundance of microplastics was quantified for each species at each location, with the total count normalized by the number of fish analyzed following the extraction and identification process. Microplastic identification was conducted using a Stereoscopic Microscope, while polymer composition was determined through ATR-FTIR spectroscopy. The microplastic abundance recorded was 0.067 particles per fish. The microplastic identified were predominantly fragments and filaments in red, black, and grey colors. The polymers found were poly(diallyl phthalate) (PDAP), poly(butylene terephthalate) (PBT), polypropylene (PP), poly(cyclohexylenedimethylene terephthalate) (PCT), and high-density polyethylene (HDPE). The finding of microplastics in fish livers provides preliminary evidence of contamination and suggests direct exposure of these vital organs. This raises serious concerns about potential contamination in other crucial organs, including the gills, gastrointestinal tract, tissues, and even the brain. This highlights the need for further research on microplastic exposure pathways and its ecological implications along the east coast of Peninsular Malaysia.

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