cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
omniakuatika.unsoed@gmail.com
Editorial Address
Kampus Perikanan dan Ilmu Kelautan Universitas Jenderal Soedirman Jl. Dr. Soeparno, Karang Wangkal, Purwokerto 53122
Location
Kab. banyumas,
Jawa tengah
INDONESIA
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.
Arjuna Subject : -
Articles 286 Documents
 25   26   27   28   29 
Vertical Mixing in The Onshore Region of The Northwestern Maluku Sea, Indonesia Priyono, Bayu; Purwandana, Adi; Kusmanto, Edi; Nuratmojo, Nuratmojo; Muhadjirin, Muhadjirin
Journal Omni-Akuatika Vol 19, No 2 (2023): 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.2023.19.2.1075

Abstract

Spatio-temporal dynamics of vertical mixing in the northwestern Maluku Sea were quantified using the Thorpe Method from archived CTD datasets collected during the expedition of Baruna Jaya VIII RCO-LIPI on November 12–13, 2000. The turbulent kinetic energy (TKE) dissipation rate and vertical eddy diffusivity values inspected the variability of mixing properties. Higher values for both parameters were found at the shallower bathymetry, which is less than 1000 m deep. This suggests that the water column is vertically unstable as a result of being often subjected to internal solitary wave (ISW) breaking events. The strong temporal variability observed from the density profile also indicated a strong impact on internal tide activity. There was temporal fluctuation of the TKE dissipation rate as well as vertical eddy diffusivity values following semidiurnal periodicity, with typical variability up to one order of magnitude for both the dissipation and diffusivity. The range of fluctuation is [6.8×10-8 ? 9.3×10-7] W kg-1 and [1.5×10-5 – 5.4×10-3] m2s-1, respectively in the upper 200 m depth. This water generated a high dissipation rate and vertical diffusivity when regularly exposed to internal solitary waves breaking from the Lifamatola Passage.Keywords: mixing properties, CTD data, turbulent kinetic energy, vertical eddy diffusivity
Analysis of Influence of Cyclone Seroja on Wave Height and Tide in the Indian Ocean Umam, Choirul Umam; Pranowo, Widodo Setiyo; Azhari, Ferian Azhari; Hendra, Hendra; Setiyadi, Johar
Journal Omni-Akuatika Vol 20, No 1 (2024): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2024.20.1.1114

Abstract

Tropical Cyclone Seroja, which occurred in the Indian Ocean, was characterized by maximum wind speeds of 70 knots. As part of the impact assessment associated with the cyclone, wave height observations were conducted along its track and tidal examinations were carried out at Cape Cuvier and Kupang tidal stations. Therefore, this research aims to analyze the relationship between wind speed and wave height, as well as the impact of Cyclone Seroja on waves and tide. The results showed that Cyclone Seroja reached a very high intensity with maximum wind speeds of 70 knots and maximum wave height of 14.24 meters on April 11, 2021, at 06:00 UTC. Regression analysis showed an R-squared value of 0.716, indicating that 71.6% of the variation in wave height can be explained by wind speed. The correlation value of 0.846 indicated a strong relationship between wind speed and wave height. This research also analyzed the changes in residual tide height at Cape Cuvier tidal station on April 11, 2021, with a maximum residual height of 0.57 meters. Wave height propagation from wave station 1487 significantly influenced the residual tide value at Cape Cuvier, with wave height of 11.790 meters and a propagation speed of 40.42 km/h. At Kupang tidal station, there was a residual height change of up to 0.27 meters, caused by influence of low pressure around wave station 239, with an average pressure of 1001 pHa and an average wave height of 3.89 meters, propagating towards the Kupang tidal station during the formation phase of Tropical Cyclone Seroja. Keywords: Cyclone; Seroja; Wave; Tide; Indian Ocean.
Water Quality and Pollution Level in Plawangan Barat, Segara Anakan, Cilacap Based on Pollution Index Approach Hidayati, Nuning Vita; Kartikaputri, Ariani Dian; Hernayanti, Hernayanti; Mahdiana, Arif
Journal Omni-Akuatika Vol 19, No 2 (2023): 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.2023.19.2.1045

Abstract

Segara Anakan is a lagoon located in Cilacap, Central Java. It is characterized as a fragile ecosystem that is very susceptible to the impacts of alterations and land development. This region is susceptible to habitat degradation caused by human activity, resulting in alterations in water quality and pollution. The objective of this study was to provide a comprehensive description of water quality by analysing its physical and chemical properties. Additionally, the study intended to assess the level of water pollution by employing the Nemerow Sumitomo Pollution Index (PI) approach.  The water quality sampling was conducted in the western region of Segara Anakan, namely Plawangan Barat. The obtained data were compared to the established standard quality for marine organisms, as outlined in the PP RI No. 22/2021. The classification of the water pollution level was determined according to Minister of Environment Decree No. 115/2003. The findings of this study indicate that the parameters of temperature, salinity, pH, dissolved oxygen (DO), and biological oxygen demand (BOD) in the water remain suitable for marine life throughout all study stations. However, it was observed that the levels of Total Suspended Solid (TSS), phosphate, and nitrate did not match the established safety thresholds. The pollution index indicated that the water quality in West Plawangan shows varying pollution levels, ranging from light to moderate pollution. Based on the findings obtained, it can be concluded that the Segara Anakan lagoon exhibits a diminished level of suitability for the life of marine organisms.Keywords: Water Quality, Index PI, Nemerow Sumitomo, Plawangan Barat, Marine Pollution
The Correlation of The Mixed Layer Depth with La Nina and El Nino Index In The Natuna Basin Aji, Tri; Pranowo, Widodo Setiyo; Asmoro, Nuki Widi; Agustinus, Agustinus; Kurniawan, Muhammad Azis; Rahmatullah, Amri
Journal Omni-Akuatika Vol 19, No 2 (2023): 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.2023.19.2.1089

Abstract

The Natuna Sea is one of the seas located in the northern part of Indonesia, which is influenced by several oceanographic climate phenomena, including the El Nino-Southern Oscillation (ENSO) system, such as La Nina and El Nino, which cause vertical temperature dynamics. This study aimed to examine the relationship between La Nina, El Nino, and normal years on the variability of the mixed layer depth in the Natuna Sea. The study utilized temperature data from the World Ocean Database (WOD) and Marine Copernicus for a period of 3 years, including years with La Nina, El Nino, and normal conditions, as well as mixed layer depth (defined by sigma theta) data from Marine Copernicus. the occurrence of La Nina, El Nino and normal years obtained from the Southern Oscillation Index (SOI). The results showed that the correlation of SOI values with the depth of Maximum Mix Layer Depth (MLD) during El Nino and La Nina was weak and very weak during the Normal year. During the La Nina, normal, and El Nino periods, the deepest MLD occurred during the west monsoon season at depths ranging from 7 to 60 meters. The shallowest MLD occurred during the first transition season at depths ranging from 7 to 25 meters. The MLD values during the east monsoon season depths ranging from 7 to 43 meters, and during the second transition season, the MLD ranges from 7 to 44 meters.
Optimation of tempe liquid waste usage for growth performances and feed uptake on Oreochromis niloticus Andriawan, Soni; Hermawan, David; Rahmania, Shafira
Journal Omni-Akuatika Vol 20, No 1 (2024): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2024.20.1.1076

Abstract

Tempe liquid waste (TLW) contains nutrients such as fat, protein, carbohydrates, nitrogen, phosphate, and potassium that could be used in fish rearing. Moreover, it has lactic acid bacteria (LAB) belonging to gram-positive microorganisms, which could decompose organic and inorganic matter in water. Therefore, this study aimed to determine whether TLW could have the potential to enhance Tilapia (Oreochromis niloticus) growth and improve feed efficiency. The study used 180 fish (6.04 ± 0.13 g) reared in twelve aquariums and TLW was obtained from boiling soybeans during the tempe production process in the village of Sanan, Malang. The research design was Completely Randomized Design (CRD), which involved four treatments, T0 (no TLW), T1 (3%), T2 (5%), and T3 (7%) with three replications. The result showed that T2 resulted in the highest growth rate (11.22 ± 0.29 g), specific growth rate (2.07 ± 0.32% / day), feed conversion rate (1.54 ± 0.16), feed efficiency (56.02 ± 1.24%) and survival rate (91.11 ± 0.58%) compared to others. Nonetheless, there was no difference in the absolute length (Lm) parameter at the end of the research. The research results also found that water quality remained favourable for supporting tilapia cultivation under all observed conditions, except for the oxygen levels in the control group, which fell below the standard (<3 mg L-1). Finally, the present study concluded that 5% of TLW could be the best; in contrast, the higher concentration of TLW decreased O. niloticus growth performance, feed efficiency, and survival rate.Keywords: fish development, tilapia, wastewater, water qualities
Accumulation of Microplastics on Seagrass Leaves of Enhalus acoroides on Mare Island as a Conservation Area in North Maluku Ramili, Yunita; Umasangaji, Halikuddin
Journal Omni-Akuatika Vol 19, No 2 (2023): 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.2023.19.2.1097

Abstract

Seagrass ecosystems have been indicated as the new hotspots of microplastics (MPs) in the marine environment. This work aimed at determining the potential of microplastics and epibionts accumulation on Enhalus acoroides leaves at the coast of Mare Island as one of the conservation areas in North Maluku region. Samples collection was carried out in August 2021 at two research locations, namely Maregam (Station 1) and Marekofo (Station 2) villages. Each of E. acoroides leaves (18 leaves) was observed for the presence of microplastic that attached on the epibionts of seagrasses. Seagrass leaves were collected using line transect which was stretched out to 50 m vertically seaward. Subsequently, the characterization of epibionts on the seagrass leave were determined according the rank of the cover percentage of epibionts. Meanwhile microplastics were identified referring to their shapes and colors under microscope observation. The results showed that three types of microplastics were embedded on the epibiont matrices of E. acoroides leaves namely fibers, fragments, and pellets. The average number of microplastic particles in E. acoroides leaves at station 1 was higher (9.1 MPs particles/leaf) than Station 2 (4.5 MPs particles/leaf). The accumulation of fiber type was higher at station 2 (76%) than station 1 (41%), conversely the accumulation of fragment type was higher at Station 1 (54%) than station 2 (19%), while pellets were found to be the least in both stations. Overall, seven colors of microplastic were found, namely blue, brown, black, red, green, orange and white, except at station 2 was absence of brown one. Station 1 was dominated by the white color (32%) while station 2 dominated by the black color (32%). According to the level of epibiont closure, it was found that the presence of microplastics was higher in the rank 1 epibiont at Station 1 where the epibiont covers less than 25%, while at station 2 was the highest one with the rank of 3 which meant that the epibiont covers was 50 – 75%. We concise that through this finding the society should be aware of microplastics extention on coastal area including seagrass leaves. Thus, the local government should pay attention of plastic debris management in the future to mitigate the impacts of these contaminants to the marine environment.Keywords: microplastics, Enhalus acoroides, epibiont, Mare Island
Growth Performance of Clown Anemonefish (Amphiprion ocellaris) in Maluku at Optimum Salinity Fitrinawati, Henny; Syahailatua, Diana Yulanda; Utami, Endang Sri
Journal Omni-Akuatika Vol 20, No 1 (2024): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2024.20.1.1098

Abstract

Clown anemonefish (Amphiprion ocellaris) is one of the most popular ornamental coral reefs. The marine ornamental fish trade has increased fishing pressure. It has a considerable impact on the clown anemonefish's declining population. The ability of each fish species to tolerate the salinity is a vital consideration in aquaculture marine organisms as it gives information on primary environmental necessities. This study aimed to analyze the clown anemonefish growth performance by modifying different salinity levels through survival rate, specific growth rate, and feed conversion ratio parameters. The experiment was conducted with a Completely Randomized Design (CRD) to investigate the effect of salinity on clown anemonefish growth performance with six treatments (24, 26, 28, 30, 32, and 35 ppt) and three replications. Water quality parameters in this study observed include pH, temperature, and dissolved oxygen. The clown anemonefish reared with six different salinity treatments for 30 days showed that there was a significantly different effect on SGR (p value = 0.007) but no significant differences in FCR (p value = 0.189) and survival rates (p value = 0.458). The considerable effect of salinity on specific growth rates explains that the amount of energy used in the osmoregulation process disrupts a portion of growth energy. The optimal growth performance of clown anemonefish was in a 24 ppt salinity treatment, accompanied by other water quality parameters such as temperature, dissolved oxygen, and pH, which ranged from 26.5 – 32oC; 4.9 - 5.6 ppm; and 7.9 - 8.2, respectively.Keywords: Amphiprion ocellaris, clown anemonefish, growth performance, salinity 
The Impact of Artificial Barriers on the Varuna litterata Migration Route in the Lower Serayu River, Central Java and Its Molecular Identification Sinaga, Sorbakti; Maimunah, Yunita; Ekawati, Arning Wilujeng; Widodo, Maheno Sri
Journal Omni-Akuatika Vol 20, No 1 (2024): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.oa.2024.20.1.1140

Abstract

The Serayu River is one of the longest rivers in Central Java. Dams built in the lower reaches of the Serayu River are thought to block the migration paths of fish and aquatic macrocrustaceans. This study aimed to determine the effect of dam on Varuna litterata migration and its molecular identification. This research was conducted using the observation method. Migration observations were made on vertical paths while molecular identification of V. litterata in the lower reaches of the Serayu River was compared with existing data in GenBank. The study covered the freshwater area above the Serayu Dam, the open area with freshwater below the Serayu Dam, and the open area with brackish water at the estuary of the Serayu River, with a study length of 33.37 km. The results showed that the presence of dams in the lower reaches of the Serayu River inhibited the migration pattern of V. litterata. The vertical shape of the dam causes only a few V. litterata to migrate to the top of the dam. The dam in the lower reaches of the Serayu River resulted in not many V. litterata being able to migrate to the top of the dam, so there were very few V. litterata found in the population upstream of the dam (115 ind). The results of molecular identification of V. litratata using the cytochrome C oxidase subunit I (COI) gene show that this crab is 100% the same as the data in GenBank and is closely related to Varuna yui and other Varunidae crab species.Keywords: Dams, Molecular, Migration, Serayu River, Varuna litterata
Effectiveness Probiotic of Nitrosomonas sp. and Bacillus sp. in Improving the Water Quality and Growth of Tilapia Larasati (Oreochromis niloticus) Sya’bana, Izzatin Nashiroh; Amalia, Rosa; Harwanto, Dicky
Journal Omni-Akuatika Vol 20, No 2 (2024): 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.2024.20.2.1170

Abstract

Water quality is the main factor that has a major influence on the growth and survival of Tilapia Larasati (Oreochromis niloticus). Nitrosomonas sp. and Bacillus sp. can optimize water quality through nitrification and denitrification processes and optimize feed utilization. This study aims to determine the effectiveness of using probiotic Nitrosomonas sp. and Bacillus sp. in O. niloticus maintenance media in improving water quality and growth. The method used was CRD with 4 treatments and 3 replications, namely treatment A (without probiotic), B (probiotic 1.0 µL/L), C (probiotic 1.5 µL/L), and D (probiotic 2.0 µL/L). This study used an aquarium measuring 40 x 30 x 40 cm filled with 20 liters of fresh water, and filled with 10 fish weighing 6.97 ± 0.20 g each (density of 1 fish/2 liters). Molasses as feed bacteria and probiotics were given according to the treatment dose. Siphon was accomplished twice a week according to the level of turbidity. Water changes once a week as much as 50 - 60%. The results from the study showed that the use of probiotics had a significant effect (P<0,05) in improving water quality and fish growth. The best result observed from treatment C, with the reduce ammonia and nitrite (0.002 and 1.291 mg/L), highest fish growth, specific growth rate, and survival rates (14.63±0.24 g; 2.48±0.01%/day; and 97±0,06%, respectively), and also lowest feed conversion ratio (1.07±0.02). Based on these results, the best dose for improving water quality and growth of O. niloticus is 1.5 µL/L.Key words: aquaculture, bioflock, organic matter, sludge, waste
Nitrate, Phosphate, Silica and Phytoplankton Abundance in the Coastal Waters of Maitara Island, North Maluku Sabar, Mesrawaty; Samman, Ardan; Abubakar, Salim; Sunarti, Sunarti; Rina, Rina; Bahtiar, Bahtiar
Journal Omni-Akuatika Vol 20, No 2 (2024): 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.2024.20.2.1147

Abstract

Nitrate, phosphate, and silica are nutrients needed for the growth of phytoplankton populations. The primary objective of the present study was to establish the relationship between the nutrient composition (nitrate, phosphate, and silica) and phytoplankton abundance. Sampling was was conducted at three observation stations located in the tidal zone of Maitara Island coast, North Maluku. Collection of plankton samples in coastal waters using a 25 µm plankton net. Phytoplankton cells were identified and counted in the laboratory using an electric microscope with 100x magnification. Phytoplankton observations were carried out using the field of view method. Testing the concentration of nitrate, phosphate, and silica using spectrophotometer techniques. The research data were analyzed using a correlation test. The research findings indicated that the coastal waters surrounding Maitara Island were classified as oligotrophic waters, based on the nitrate and phosphate, and silica content. Oligotrophic waters have very low nutrient content such as nitrogen and phosphorus, causing low primary productivity. Simultaneously, nitrate, phosphate, and silica concentrations had a very strong correlation (R=0.823) with phytoplankton abundance. Partially, the correlation between nitrate concentration and phytoplankton abundance was classified as very strong (R=0.729). However, the correlation between phosphate concentration and phytoplankton abundance was moderately significant (R=0.577), and the correlation between silica concentration and phytoplankton abundance was weak (R=0.386). High concentrations of nitrate and phosphate in coastal waters lead to increased abundance of phytoplankton. However, high silica concentrations in waters can only increase the abundance of certain phytoplankton groups, for example diatoms and radiolarians. Keywords: Phytoplankton abundance, nitrate, phosphate, silica, Maitara Island

Page 28 of 29 | Total Record : 286

 25   26   27   28   29 

Filter by Year

2014 2025


Reset
Filter By Issues
All Issue Vol 21, No 1 (2025): Omni-Akuatika May (in progress) Vol 20, No 2 (2024): Omni-Akuatika November Vol 20, No 1 (2024): Omni-Akuatika May Vol 19, No 2 (2023): Omni-Akuatika November Vol 19, No 1 (2023): Omni-Akuatika May Vol 18, No 2 (2022): Omni-Akuatika November Vol 18 (2022): Omni-Akuatika Special Issue 4th Kripik SCiFiMaS Vol 18, No 1 (2022): Omni-Akuatika May Vol 17, No 2 (2021): Omni-Akuatika November Vol 17, No 1 (2021): Omni-Akuatika May Vol 16, No 3 (2020): Omni-Akuatika Special Issue 3rd Kripik SCiFiMaS Vol 16, No 2 (2020): Omni-Akuatika November Vol 16, No 1 (2020): Omni-Akuatika May Vol 15, No 2 (2019): Omni-Akuatika November Vol 15, No 1 (2019): Omni-Akuatika May Vol 14, No 3 (2018): Omni-Akuatika November Vol 14, No 1 (2018): Omni-Akuatika May Vol 13, No 2 (2017): Omni-Akuatika November Vol 13, No 1 (2017): Omni-Akuatika May Vol 12, No 3 (2016): Omni-Akuatika Special Issue Kripik SCiFiMaS Vol 12, No 2 (2016): Omni-Akuatika November Vol 12, No 1 (2016): Omni-Akuatika May Vol 11, No 2 (2015): Omni-Akuatika November Vol 10, No 2 (2014): Omni-Akuatika November Vol 10, No 1 (2014): Omni-Akuatika May Omni-Akuatika Special Issue 2nd Kripik SCiFiMaS More Issue