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Munawar Khalil
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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 6 Documents
 1 
Search results for , issue "Volume 2, Issue 3 (November, 2025)" : 6 Documents clear
Post-bleaching patterns of Acanthaster planci, Culcita schmideliana, and Drupella spp. in coral nurseries and natural reefs, Kaafu Atoll, Maldives Mohamad, Elias Bin; Migliaccio, Oriana
Journal of Marine Studies Volume 2, Issue 3 (November, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i3.22084

Abstract

The 2024 mass coral bleaching event caused by prolonged thermal stress severely impacted numerous coral reef ecosystems across the Maldives, compromising structural complexity and recovery potential. Our study investigates the post-bleaching distribution, abundance, and ecological impact of key corallivorous species, Acanthaster planci, Culcita schmideliana, and Drupella spp., within two lagoon coral nurseries and a natural reef front in Kaafu Atoll, Maldives. Benthic surveys revealed varying degrees of coral loss due to bleaching. Live coral cover was lowest in lagoon coral nurseries (lowest, 14.2%) and highest at the reef front (34%). A. planci was absent from all transects, with only one individual sighted throughout the study. In contrast, C. schmideliana exhibited notable densities (up to 6 individuals/100 m²) on the reef crest and flat but was absent in lagoon nurseries. Drupella spp. were recorded at all sites, with highest densities and frequency of predation observed in Veli nursery (58%), where Acropora spp. were the most affected. Significant differences in snail size and aggregation intensity were found across the transects, with larger individuals on the reef front. The results suggest that while predators like A. planci remain rare post-bleaching, possibly due to the population control measures and thermal sensitivity, other underestimated predators such as Drupella spp. and C. schmideliana are exerting sustained pressure on recovering coral communities. Our findings highlight the need for targeted corallivore management in post-disturbance reef restoration strategies, particularly in coral nursery environments to support reef resilience and inform site-specific restoration strategies in nursery-based rehabilitation efforts.
Investigation into the influence of treatment parameters using central composite design (CCD) and characterization of chitosan extracted from marine crab shell wastes Sumaila, Abdulmumuni; Ibrahim, Jimoh; Yahaya, Muhammad Kabir; Sumaila, Ahmed Onimisi; Aniki, Samuel Adamariko
Journal of Marine Studies Volume 2, Issue 3 (November, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i3.22561

Abstract

The extraction and characterization of chitosan from marine crab shell waste have garnered significant attention due to the increasing demand for sustainable and biodegradable biomaterials. This study investigates the influence of critical treatment parameters on the extraction efficiency and quality of chitosan, using Response Surface Methodology (RSM) based on Central Composite Design (CCD) for optimization. Marine crab shells, an abundant seafood processing by-product, were subjected to a three-step extraction process involving demineralization, deproteinization, and deacetylation. Key variables such as acid concentration, alkali concentration, reaction temperature, and treatment duration were systematically varied to evaluate their effect on chitosan yield and properties. The optimized extraction conditions yielded high-quality chitosan with improved physicochemical properties. Characterization techniques, including Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were employed to assess the functional groups, morphology, crystallinity, and thermal stability of the extracted chitosan. The results confirmed the successful removal of calcium carbonate and proteins, and the presence of characteristic amine and hydroxyl groups indicative of chitosan. SEM analysis revealed a porous surface morphology suitable for biomedical and environmental applications. Statistical analysis of the CCD model showed a significant correlation between the treatment parameters and chitosan yield, with high predictive accuracy (R² > 0.95). This study not only demonstrates the feasibility of utilizing marine crab shell waste as a valuable resource but also highlights the effectiveness of CCD in optimizing biopolymer extraction processes. The findings contribute to the advancement of green chemistry and waste valorization strategies, promoting the circular bioeconomy and environmental sustainability.
From genes to ecosystems: A multidisciplinary approach to understanding and conservation challenges for the short-tailed sea snake Hydrophis curtus (Shaw, 1802) in India Hatkar, Prachi; Gupta, Satyam; Ramesh, Chinnasamy
Journal of Marine Studies Volume 2, Issue 3 (November, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i3.21664

Abstract

The reduction of marine reptile populations has emerged as a worldwide issue, prompting comprehensive investigations into the effects of altering environmental conditions. Examining sea snakes has consistently posed difficulties owing to the complexities of collecting, maintaining, and researching them in natural and controlled environments. The Hydrophiinae family of venomous marine snakes encompasses the Spine-bellied or Short-tailed sea snake, Hydrophis curtus, which is distributed from the Persian Gulf to eastern Australia. This study examines the conservation problems of H. curtus, incorporating genetic, ecological, and environmental methodologies to evaluate its population status and risks thoroughly. We thoroughly analysed 123 scientific publications published between 1802 and 2024, examining many facets of sea snake biology and the risks they encounter. This review consolidates and synthesizes prior research on H. curtus, emphasizing its interactions with humans in coastal India and adjacent areas. The review encompassed several subjects, including species distribution, habitat utilization, feeding ecology, reproductive behaviour, venom characteristics, and conservation challenges. Through field surveys, genomic methodologies, and habitat modelling, we ascertain critical conservation priorities and recommend management methods. Our results demonstrate considerable genetic diversity, substantial habitat concerns, and mortality imposed by fishing. The research emphasizes the necessity for focused conservation measures, encompassing habitat preservation, policy integration, and sustainable fisheries management.
Corrigendum to “Post-bleaching patterns of Acanthaster planci, Culcita schmideliana, and Drupella spp. in coral nurseries and natural reefs, Kaafu Atoll, Maldives” [Journal of Marine Studies, 2025, 2(3), 2301] Mohamad, Elias Bin; Migliaccio, Oriana
Journal of Marine Studies Volume 2, Issue 3 (November, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i3.23306

Abstract

Refer to:    Post-bleaching patterns of Acanthaster planci, Culcita schmideliana, and Drupella spp. in coral nurseries and natural reefs, Kaafu Atoll, Maldives. Journal of Marine Studies, 2(3), 2301. https://doi.org/10.29103/joms.v2i3.22084. Elias Bin Mohamad, Oriana Migliaccio
Evaluating the stock status of Trachurus trecae (Cadenat, 1950) in the Eastern Central Atlantic Ocean based on an extended surplus production model incorporating life history and fishery selectivity Konoyima, Komba Jossie
Journal of Marine Studies Volume 2, Issue 3 (November, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i3.22956

Abstract

This study on Trachurus trachurus used data from the Regional Committee (CECAF). It employs JABBA-Select, a model that balances age-structured and traditional surplus production models, uniquely incorporating life history and fishery selectivity. Sensitivity scenarios included single and combined catch per unit effort (CPUE) data (1999-2017) for demersal and pelagic fisheries under logistic and dome-shaped selectivity functions. Results indicated that the demersal CPUE under logistic selectivity performed best, leading to a single-fleet analysis as the base case. Model results were robust against variations in natural mortality (M) compared to other input parameters, including steepness (h), while stock status perceptions remained consistent. The base case revealed an overexploited stock (SB/SBMSY = 66%) with a slow growth rate (r = 29%) in 2017. Catches exceeding 15,744 tons from 2022 to 2030 may not be sustainable. JABBA-Select is recommended for future assessments; however, careful consideration of input parameters is essential to minimize uncertainties.
Time series analysis and forecasting of Nigerian marine fish catch (1960-2015) using ARIMA models Isemin, Nsidibe Linus; Etim, Lawrence
Journal of Marine Studies Volume 2, Issue 3 (November, 2025)
Publisher : Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/joms.v2i3.24522

Abstract

A 56-year (1960 to 2015) catch data of Nigerian marine fisheries was analysed, and an ARIMA (3,1,3) model was employed to generate a short-term forecast (2016–2045). The Akaike information criterion (AIC), Schwarz information criterion (SIC), and Hannan-Quinn criterion (HQC) in conjunction with the log likelihood (Log L) and R2 statistics were employed to select the optimal model for the time series. Similarly, three benchmarks were considered: Root Mean Square Error (RMSE), Mean Absolute Error (MAE) and Theil Inequality Coefficient (TIC) to compare the in-sample and out–of–sample forecasts' performances of the estimated ARIMA (3,1,3) model, evaluating its forecasting ability and determining which forecast is superior for the model. The forecast results indicated that, everything remaining equal, approximately 27,021,461 metric tons of marine fish will be caught in Nigeria between 2016 and 2045 with an annual average of 900,715 metric tons. Temporal pattern of the forecasted data exhibited inherent fluctuations and an upward trend, similar to the original data. These fluctuations in catch trends are attributed to various factors, such as government policy, piracy, illegal activities of foreign trawlers, war conflicts, and the remote location of fishing villages. To obtain robust and reliable data from Nigerian marine fisheries, the negative impacts of these factors must be mitigated.

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