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ILMU KELAUTAN: Indonesian Journal of Marine Sciences
Published by Universitas Diponegoro
ISSN : 08537291     EISSN : 24067598     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
ILMU KELAUTAN: Indonesian Journal of Marine Sciences (IJMS) is dedicated to published highest quality of research papers and review on all aspects of marine biology, marine conservation, marine culture, marine geology and oceanography.
Arjuna Subject : -
Articles 783 Documents
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Metabolite Composition and Bioactivity of Murdannia loriformis against Marine Parasitic Leech and Vibrio Species Mohd Hafizan Bin Kamal; Fui Jin Wong; Yoong Soon Yong; Jen Kit Tan; Rossita Shapawi; Nurzafirah Mazlan; Muhammad Dawood Shah
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 31, No 3 (2026): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.31.3.265-275

Abstract

Vibriosis and parasitic infestation pose significant challenges in aquaculture. The parasitic leech Pterobdella arugamensis harms fish and makes them more susceptible to Vibrio secondary infections. While toxic chemical treatments are commonly used, there is a growing demand for safer, eco-friendly alternatives. Consequently, research has increasingly focused on natural products derived from plants. In the current study, we investigated the anti-Vibrio and antiparasitic potentials of the aqueous extract of Murdannia loriformis (Hassk.) Rolla Rao et Kammathy, a medicinal plant belonging to the Commelinaceae family. The extract was tested against five Vibrio species and the parasitic leech P. arugamensis. Additionally, its metabolite composition was analysed using mass spectrometry techniques, including liquid chromatography quadrupole orbitrap mass spectrometry (LC-q-Orbitrap-MS). The extract of M.  loriformis exhibited bactericidal activities against Vibrio species at concentrations of 100 and 50 mg.mL-1 with inhibition zones ranging from 7.33 ± 0.47 mm to 17.33 ± 0.45 mm, in a dose-dependent manner. The extract also demonstrated dose-dependent antiparasitic effects against P. arugamensis, with mortality time ranging from 10.37 ± 1.77 to 67.02 ± 5.38minutes at concentrations of 100 to 12.5 mg.mL-1. The LC-q-Orbitrap-MS analysis detected 39 metabolites in both positive and negative modes, including numerous important metabolites such as orientin, corchorifatty acid F, pyridoxine, nicotinic acid, schaftoside, corymboside, vicenin-2, hexadecanamide, pinolenic acid, eleutherazine B, dimethylfraxetin, paprazine, and trigonelline. These findings highlight the significant anti-Vibrio and antiparasitic potential of M.  loriformis extract, making it a promising natural substitute for controlling Vibrio infections and parasitic leech infestations in aquaculture systems.
Development of Disaster Mitigation Approach and Coastal Area Carrying Capacity Based on Coastal Vulnerability Index (CVI): A GIS Analysis in Betahwalang Waters, Demak Galung Dhiva Maharani; Agus Indarjo; Muhammad Zainuri; Denny Nugroho Sugianto; Dwi Haryo Ismunarti; Indra Budi Prasetyawan; Nazariano Rahman Wahyudi; Chrisna Adhi Suryono; Bambang Yulianto; Ria Azizah Tri Nuraini; Fadhil Muhammad
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 31, No 3 (2026): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.31.3.333-352

Abstract

This study aims to develop an integrated framework for disaster mitigation and coastal carrying capacity assessment by combining the Coastal Vulnerability Index (CVI) with trophic status analysis in Betahwalang Waters, Demak. Unlike previous studies that primarily evaluate physical vulnerability or ecological conditions separately, this study integrates both approaches to identify areas where high physical susceptibility coincides with ecological pressure, thereby providing a more comprehensive basis for sustainable coastal management. Seven physical parameters, including geomorphology, slope, elevation, land use, distance from the shoreline, distance from rivers, and tidal range, were analyzed using a weighted overlay approach in ArcGIS based on field observations, Sentinel-2 imagery, Digital Elevation Model (DEM), and tidal data. Ecological carrying capacity was assessed using trophic status derived from chlorophyll-a and nitrate concentrations following the EPA trophic classification. The results indicate that 69.01% of the study area falls within the high (42.96%) and very high (26.05%) coastal vulnerability classes, primarily due to low elevation, gentle slopes, and extensive aquaculture replacing natural mangrove protection. Chlorophyll-a concentrations ranged from 2.19 to 36.19 µg.L-1, while nitrate concentrations ranged from 43.62 to 126.52 µg.L-1, indicating mesotrophic to eutrophic conditions with moderate to high nutrient enrichment. The integrated assessment revealed that physically vulnerable areas generally coincide with nutrient-enriched coastal waters, indicating increasing environmental pressure and reduced ecological carrying capacity. These findings demonstrate that integrating CVI with trophic status provides additional spatial insight beyond conventional vulnerability assessments by simultaneously identifying priority areas for ecosystem restoration, disaster risk reduction, and sustainable aquaculture management. The integration of CVI and trophic status provides additional spatial insight by identifying areas where high physical vulnerability coincides with ecological pressure, thereby supporting ecosystem-based disaster mitigation and sustainable coastal management. The proposed framework supports evidence-based coastal planning through ecosystem-based disaster mitigation strategies, including mangrove restoration, spatial zoning, and adaptive coastal management under climate change.
Optimizing Kappaphycus alvarezii Productivity Using Biofertilizer Derived from a Combination of Black Soldier Fly Larvae Frass and Seaweed Sri Mulyani; Indra cahyono; Batara Surya; Muhammad Ro’il Bilad
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 31, No 3 (2026): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.31.3.219-228

Abstract

Kappaphycus alvarezii is an important seaweed for various industries. Indonesia, as one of the largest producers, cultivates it extensively in South Sulawesi, particularly on Tanakeke Island. However, because the adoption of aquaculture technologies among local farmers remains limited, the quality and quantity of production are not yet optimal, making the use of biofertilizers one solution to increase cultivation yields. Biofertilizers are necessary because they are environmentally friendly and can be made from industrial waste to improve productivity. However, their effectiveness is not yet known, and the basic materials are very limited. Therefore, this study aims to evaluate the effectiveness of using biofertilizers made from black soldier fly frass (BSFF) and K. alvarezii in increasing the specific growth rate and carrageenan content of K. alvarezii. Water-quality parameters were also measured to support the interpretation of the experimental results. Samples were collected in Mallasoro Bay, South Sulawesi, and laboratory analysis were conducted at Pangkajene Pangkep Island State Polytechnic Laboratory. This research used four treatments:  treatment A (BSFF-based biofertilizer), treatment B (K. alvarezii-based biofertilizer), treatment C (combination of BSFF and K. Alvarezii-based biofertilizer), and treatment D (control). The results showed that treatment C had the highest average specific growth rate of 5.41 ± 0.84%. Treatment C also had the highest carrageenan content of 56.61 ± 0.63%. This study highlights the potential of a combination of biofertilizer based on BSFF and seaweed as an environmentally friendly and cost-effective alternative to chemical fertilizers for increasing K. alvarezii cultivation productivity while utilizing BSFF waste. However, commercial use of these biofertilizer combinations requires further study.

Page 79 of 79 | Total Record : 783

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