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Omni-Akuatika
Published by Universitas Jenderal Soedirman
ISSN : 18583873     EISSN : 24769347     DOI : -
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science
OmniAquatika is a scholarly refereed research journal which aims to promote the theory and practice, innovation, engineering and management as well as social-economic relevant in fisheries and marine sciences fields. The main aspects of research areas include, but are not exclusive to the current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems in the field of fisheries and marine science. The journal also welcome other aquatic relevant aspect related to the transport, fate, control of nutrients and abatement of pollutants in the aquatic environment as well as the ecosystem rehabilitation. The authors and readers are students, scientists, and regulatory experts from the academic, industrial, and government sectors worldwide. Master thesis and part of dissertation research work might becoming the potential contributors. High-quality, research articles make up the primary content. Other contributions are short communications, reviews, and special issues. Before contributions are accepted for publication, they must pass a peer-review process managed by the editor-in-chief.
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Articles 300 Documents
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The Effect of Ketapang Leaf Extract (Terminalia catappa) For Soaking Gouramy Fish Eggs (Osphronemus gouramy) on Hatching Rate and Survival Rate Wildan Rasyid Mukhtar; Sri Hastuti; Dewi Nurhayati
Journal Omni-Akuatika Vol 21, No 2 (2025): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2025.21.2.1133

Abstract

The problem that often occurs in the process of hatching gourami fish eggs is the low egg hatching rate due to fungal attacks. One way to overcome this is by soaking eggs with ketapang leaf extract as an ingredient that has an antifungal effect. This research aims to determine the effect of soaking gouramy eggs (Osphronemus gouramy) in ketapang leaf extract at different doses on the hatching rate. The research was conducted using a completely randomized design (CRD) with 4 treatments and 3 replications. Treatment A uses 0 g/L ketapang leaf extract, treatment B 1 g/L, treatment C 2 g/L, treatment D 3 g/L. The parameters observed in this study were: egg hatchability, larval survival, prevalence of fungi in eggs and water quality parameters of egg hatching and larval rearing media (temperature and pH). The results showed that soaking eggs with ketapang leaf extract had a significant effect (P<0.05) on egg hatchability, fungal prevalence and survival rate. The highest hatching rate value was on treatment C at 88.33±2.08%, followed by treatment D at 84.67±4.51%, treatment B at 78.67±5.13%, and treatment A at 73.67±3.51%. The lowest prevalence value of the fungus that attacks the eggs was in treatments C and D is 10.00±3.51% and 10.67±3.61%, followed by treatment B at 15.00±1.00%, and treatment A at 24.67±4.73%. The highest larval survival value was in treatment C with 81.20±0.74%, followed by treatment D at 79.13±1.93%, treatment B at 75.26±5.81%, treatment A 66.97±3.00%. Water quality for temperatures ranges from 23-28 oC and pH ranges from 6.7-7.5.
The Effectiveness of Different Plant Types in Reducing Total Ammonia Nitrogen and Increasing Growth of Goldfish (Carrasius auratus) In Aquaponic Systems Muhammad Webby Hibrizi; Dicky Harwanto; Vivi Endar Herawati
Journal Omni-Akuatika Vol 21, No 2 (2025): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2025.21.2.1186

Abstract

Goldfish is one of Indonesia's most popular ornamental fish due to their high economic value. The high market demand for goldfish led to increased production and intensified cultivation. The intensification can impact water quality and increase waste production. This can affect the availability of supportive cultivation land and increase the water demand. Using an aquaponic system in Goldfish cultivation is a viable solution that can help maintain water quality and reduce high waste production. This study aims to evaluate different types of plants in reducing Total Ammonia Nitrogen (TAN) and assess the impact of different plant types on goldfish growth. This study used goldfish with a stocking density of 12 fish in each container (15 liters). The study employs an experimental method and a completely randomized design (CRD) with 4 treatments and 3 replications. The treatments of Goldfish culture were without plants (A), Lactuca sativa (B), Amaranthus tricolor (C), and Brassica oleracea (D). The observed variables included Dissolved Oxygen, pH, temperature, TAN, nitrate, absolute fish weight, absolute fish length, plant length, Feed Conversion Ratio, Specific Growth Rate, and Survival Rate. The results indicated that different plant types significantly affected TAN reduction and goldfish growth (P<0.05). The best TAN reduction and growth were observed with A. tricolor (95% probability). Amaranthus tricolor effectively reduced TAN levels and enhanced goldfish growth. This study provides valuable information on the impact of different plant types in lowering TAN levels and improving goldfish growth in an aquaponic system.Keywords: hydroponics, kale, lettuce, recirculating, spinach
Spatial Modeling of Seaweed (Kappaphycus alvarezii) Cultivation Suitability Using GIS in Tinangkung Waters, Central Sulawesi, Indonesia Sri Sudewi; Maharaji U Labugis; Ahsan Mardjudo; Fadly. Y Tantu; Umar Alatas
Journal Omni-Akuatika Vol 21, No 2 (2025): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2025.21.2.1314

Abstract

Particularly in the waters of Tinangkung, Central Sulawesi, the management of seaweed through marine spatial planning and evidence-based site selection remains extremely limited. The objective of this study was to assess the suitability of the environment for Kappaphycus alvarezii cultivation based on spatial modeling using a Geographic Information System (GIS). Eight environmental parameters were tested, namely depth, temperature, salinity, brightness, current velocity, nutrients (nitrate and phosphate), pH, and dissolved oxygen (DO), which were integrated into GIS software using the weighted overlay method to produce a land suitability map. The results indicated that the area was divided into three suitability classes, namely highly suitable (S1) covering an area of ± 722.79 ha (31.8%), suitable (S2) covering an area of ± 1,616.72 ha (66.6%), and unsuitable (N) covering an area of ± 88.29 ha (3.6%). The central and southern zones of Tinangkung Bay are classified as highly suitable (S1) with stable water characteristics, high clarity, and optimal oxygen and salinity content. In contrast, coastal and estuarine areas are classified as less suitable (S2) due to the influence of land runoff, which alters salinity and pH. GIS-based modeling is effective in integrating environmental data to assist in a comprehensive mapping of marine aquaculture suitability. This study produced the first land suitability map for K. alvarezii aquaculture in Tinangkung waters, which can serve as a scientific basis for the formulation of marine spatial planning policies and sustainable seaweed aquaculture management in Central Sulawesi.
Evaluation of Nickel, Copper, and Cadmium Contamination in Sediments from The Waters of Mare Island, North Maluku Andi Budi Bakti; Muhammad Yudhistira Azis; Halikuddin Umasangaji; Diyah Fatimah Oktaviani; Prasetyo Abi Widyananto
Journal Omni-Akuatika Vol 21, No 2 (2025): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2025.21.2.1263

Abstract

Mare Island has been appointed as a conservation area and tourist park due to its seagrass, coral reef, and mangrove ecosystems. However, intensive nickel mining activities in Maluku have the potential to contaminate the marine environment. Heavy metals resulting from these activities are toxic and harmful to both human and marine biota health. Monitoring of the marine environment is important through sediment quality assessment. Therefore, this study aims to evaluate contamination of Ni, Cu and Cd in sediments from the waters of Mare Island, using verified testing methods. The sediment samples were wet-digested using aqua regia on a hotplate and analyzed using flame atomic absorption spectrophotometer (FAAS). The testing method was verified according to AOAC guidelines, covering linearity, LOD, LOQ, recovery, and repeatability. The results show that the concentrations of Ni, Cu, and Cd in the waters of Mare Island ranged from 23.30–29.30; <0.51–5.21 and 6.20–7.94 mg/kg dw, respectively. The Cu concentration is still within safe limits, while Ni and Cd concentrations are categorized as hazardous, posing a risk to marine biota. Based on Contamination Factor, Enrichment Factor, Pollution Load Index, and Potential Ecological Risk Index values, the waters of Mare Island are classified as polluted, originating from anthropogenic activities.
Revealing Porifera Diversity by Metabarcoding Environmental DNA Data in Coral Reef Ecosystems of Lombok Island Waters Arief Pratomo; Jelita Rahma Hidayati; Carolline Desrainy Nababan; Beginer Subhan; Inna Puspa Ayu
Journal Omni-Akuatika Vol 21, No 2 (2025): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2025.21.2.1226

Abstract

Lombok waters are located in the Coral Triangle area, a region with high marine biodiversity, including Porifera. Information on Porifera diversity in Lombok waters is still minimal, due to the difficulty of identifying them. Metabarcoding eDNA is an alternative method for revealing the potential diversity of Porifera non-invasively, widely, quickly, and effectively. This study aimed to determine the diversity of Porifera with eDNA data in Lombok Waters. This study used quantitative methods with bioinformatics tools in the data processing process. The eDNA data were obtained from previous research results that have been stored in GenBank PRJNA768103 which includes seawater and sediment sample types in the 12 µm and 0.4 µm membrane pore fractions in the East, West, and North Lombok regions This study successfully identified 19 genera of Porifera dominated by Hippospongia, Haliclona, and Terpios in each location and sample type. Comparison of alpha diversity showed a significant difference in membrane pore fraction (p = 0,0262). Meanwhile, beta diversity showed a significant difference in the Porifera community between East and North Lombok (p = 0,01). Significant differences in alpha and beta diversity indicate the influence of environmental factors and habitat characteristics in shaping the community structure of Porifera in Lombok waters. These findings highlight the potential of the eDNA approach as an efficient biomonitoring tool for marine biodiversity and support sustainable management and conservation of Lombok’s marine ecosystems.
Assessment of Integrated Agriculture–Aquaculture Scenarios for Aquatic Animal Cultivation and Floating Rice in Coastal Zones Heriansah Heriansah; Indra Cahyono; Nursidi Nursidi; Awaluddin Awaluddin; Fathuddin Fathuddin
Journal Omni-Akuatika Vol 22, No 1 (2026): Omni-Akuatika May (In press)
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2026.22.1.1329

Abstract

This study represents a potentially groundbreaking exploration into the dual integration of agriculture and aquaculture (IAA) systems in brackish water. The objective of this work was to assess the production performance of the IAA system under various species combination scenarios, which are pivotal in multi-species cultivation. Conducted over an 80-day period, this study employed three species combination scenarios: milkfish and rice (Scenario 1), milkfish, tiger shrimp, and rice (Scenario 2), and milkfish, tiger shrimp, mussel, and rice (Scenario 3). A floating-bed system was utilized for rice cultivation in all scenarios. The pilot scale experiment was meticulously designed, including tarpaulin ponds, acclimatization, feed, and aeration to establish a conducive environment within the system. Results revealed proportional species growth, with the mortality rate (MR) of milkfish, tiger shrimp, and rice showing no significant impact (P > 0.05) from species combinations. However, significant differences (P < 0.05) were observed in the weight gain (WG) and specific growth rate (SGR) of milkfish, as well as the height gain (HG) of rice among species combinations. Nutrient removal efficiency (NRE) for nitrogen and phosphorus increased significantly with the combined number of species. Species combinations also had a significant effect on feed efficiency ratio (FER). All observed parameters in scenario 3 (IAA) demonstrated superiority, making it a more practical approach for the IAA model in coastal zones. This study validates an optimal species combination model, providing a scalable framework to advance productivity and nutrient efficiency in future integrated coastal aquaculture systems.
THE INFLUENCE OF THE INDIAN OCEAN DIPOLE (IOD) PHENOMENON ON SEA SURFACE TEMPERATURE AND CHLOROPHYLL-A IN THE SUNDA STRAIT Nadia Firmanda Nur Hasanah; Arie Antasari Kushadiwijayanto; Apriansyah Apriansyah
Journal Omni-Akuatika Vol 22, No 1 (2026): Omni-Akuatika May (In press)
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2026.22.1.1243

Abstract

The Indian Ocean Dipole (IOD) interannual ocean-atmosphere anomaly phenomenon impacts marine ecology in the Sunda Strait region. This study aims to analyze the influence of IOD on sea surface temperature (SST) and chlorophyll-a (Chl-a) in the Sunda Strait. Monthly time series data from 2006-2020 (15 years) were obtained from Copernicus Marine Service, and analyzed using Pearson Correlation, Cross Wavelet Transform (XWT), and Wavelet Coherence Transform (WTC) methods. The results showed that for 15 years (2006-2020) the ranged from 27.63°C-30.55°C and Chl-a ranged from 0.082 mg.L-1- 3.611 mg.L-1. In the Western Season (JJA) and Transitional I (MAM), SST tends to be warm and Chl-a is low, while in the Eastern Season (DJF) and Transitional II (SON) SST tends to be cold and Chl-a is high. During IOD+, SST relatively low and Chl-a is high, while during IOD-, SST tends to be high and Chl-a is low.While Pearson correlation shows weak global linear relationships for SST-IOD (r = -0.2627) and Chl-a-IOD (r = 0.3794), XWT and WTC analyses reveal significant localized coherence in the time–frequency domain. These results are complementary rather than contradictory; wavelet-based methods capture transient, non-stationary interactions during specific periods and scales that global linear correlations fail to detect. The results of XWT and WTC analysis show a strong relationship between SST and Chl-a to the IOD.
Spatial and Temporal Influences of El-Niño Southern Oscillation and Indian Ocean Dipole on Natuna Sea Surface Temperature and Surrounding Areas Alextansius Verel Renaldo; Arie Antasari Kushadiwijayanto; Apriansyah Apriansyah
Journal Omni-Akuatika Vol 22, No 1 (2026): Omni-Akuatika May (In press)
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2026.22.1.1236

Abstract

This study aims to investigate the spatial and temporal impacts of El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) on Sea Surface Temperature (SST) variations in the Natuna Sea and its adjacent waters. In this study, Cross Wavelet Transform (XWT) and Partial Correlation were used to determine the time-frequency relationship and isolate the specific influence of ENSO and IOD on SST. These primary methods were substantiated by Time Series Analysis, Power Spectral Density (PSD), and Cross Correlation, which first identified the dominant interannual periodicities and lag phases required for causal analysis. Analysis reveals that the interannual phenomenon (in a period of 2-7 years) is dominant in controlling the SST anomalies in the Natuna Sea. The XWT analysis shows that SST responds to ENSO and IOD within a 2-7 year band, though with varying lag phases of 2-3 months in the northern region and 7-10 months in the southern region. Meanwhile Partial Correlation analysis confirms a positive relationship across the basin with the IOD exhibiting a stronger and more uniform influence (r = 0.5-0.8) compared to ENSO (r = 0.1-0.7). These results suggest that SST warming in the Natuna Sea is driven primarily by atmospheric teleconnections rather than direct oceanic advection, particularly in the northern region.
Resilience Under Pressure: Application of CRes Index to Monitor Coral Ecosystem Shifts in Jaboi, Aceh Post-Mass Bleaching Events Nadia Aldyza; Afkar Afkar
Journal Omni-Akuatika Vol 22, No 1 (2026): Omni-Akuatika May (In press)
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2026.22.1.1333

Abstract

This study assessed the resilience of coral reef ecosystems in the coastal waters of Jaboi, Sabang City, Weh Island, conducted in August 2025. The study area is an open marine zone that has not yet been designated as a marine protected area, highlighting the urgency of evaluating ecosystem resilience as a scientific basis for future conservation planning. Data collection was conducted using six parallel transects installed along the coastline at depths of 3 m and 7 m. Coral cover, turf algae, Crustose Coralline Algae (CCA), and rubble were recorded using 50 m line transects combined with underwater video analysis, while the density of blue sea stars (Linckia laevigata) and sea urchins was assessed using belt transects (100 m²). The results indicated that shallow waters exhibited higher live coral cover, greater CCA presence, and higher abundance of L. laevigata, reflecting a more stable ecosystem with strong recovery potential. In contrast, deeper waters showed increased dominance of turf algae and higher sea urchin density, suggesting emerging ecological pressures despite remaining within the high-resilience category. Differences in substrate quality between depths were identified as a key factor influencing benthic community structure. Overall, the coral reefs of Jaboi demonstrate relatively high resilience; however, early signs of ecological stress emphasize the need for continuous monitoring and proactive management. The findings support the use of the CRes Index as an effective tool for reef resilience assessment and provide essential baseline data to inform conservation zoning, restoration initiatives, and sustainable coastal management in Indonesia.
Natural and anthropogenic evidence drive macronutrient distribution in the Bengkulu River, Indonesia Idha Ikhsani; Ilham Ilham; Hanif Budi Prayitno; Rina Elvia; Suci Lastrini; Nurhamidah Nurhamidah; Kuo Hong Wong; Wiwit Wiwit
Journal Omni-Akuatika Vol 22, No 1 (2026): Omni-Akuatika May (In press)
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2026.22.1.1217

Abstract

The Bengkulu River, the largest river in Bengkulu Province, discharges into the Indian Ocean and drains a watershed increasingly influenced by agricultural, urban, and industrial activities. Despite its ecological and socio-economic importance, information on nutrient distribution and export along the river–estuary continuum remains limited. This study investigated the distribution, transport, and potential sources of macronutrients (nitrite, nitrate, phosphate, and silicate) and estimated their fluxes to adjacent coastal waters. Surface water samples were collected from 15 stations along the Bengkulu River–estuary system during the dry season (17–19 March 2023). Nutrient concentrations were analyzed using spectrophotometric methods. Concentrations ranged from 0.01–5.17 ppm for nitrite, 0.01–1.94 ppm for nitrate, 0.01–0.35 ppm for phosphate, and 0.79–35.21 ppm for silicate, with mean values of 0.54 ± 1.30, 0.38 ± 0.49, 0.04 ± 0.10, and 11.19 ± 9.92 ppm, respectively. Higher concentrations of nitrite, nitrate, and phosphate were generally observed near areas with intensive agriculture, industrial activities, and dense settlements, suggesting potential anthropogenic influence, although natural hydrodynamic processes may also contribute. In contrast, silicate showed higher concentrations in upstream areas and decreased toward the coast, a pattern that may be associated with dilution during mixing and biological uptake. Estimated nutrient fluxes to the Indian Ocean were ~9.9 × 10? mg day?¹ for silicate, 1.9–6.1 × 10? mg day?¹ for nitrate, 9.1–9.4 × 10? mg day?¹ for nitrite, and 1.8–6.0 × 10? mg day?¹ for phosphate. These results suggest that the Bengkulu River is an important pathway for nutrient transport to adjacent coastal waters. The findings provide baseline information on nutrient dynamics and land–sea nutrient connectivity in tropical river systems.

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