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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 743 Documents
 65   66   67   68   69 
Mapping Embryogenesis in the Early Phases of Seabass (Lates calcarifer) Eggs on Different Salinities Djawad, Muhammad Iqbal; Tenriajeng, Muhammad Al Ghiffari; Trijuno, Dody Dharmawan
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 3 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.3.351-358

Abstract

Embryogenesis is a critical stage in the development of fish eggs, as it determines the successful hatching and survival of larvae. Understanding the effects of salinity on embryogenesis is crucial for optimizing hatchery practices and improving the production of fish larvae, such as the seabass. The purpose of this study was to map the stages of embryonic development against various salinities in order to identify the ideal salinity for seabass egg hatching. Eggs from natural spawning in a maintenance bath were used in this investigation. Four containers with salinity treatments (20 ppt, 25 ppt, 30 ppt, and 35 ppt) are used to lay fertilized eggs. The findings demonstrated that, in comparison to 20 ppt and 25 ppt treatments, eggs at 30 ppt and 35 ppt treatments generated faster embryonic development stages. Different incubation salinities have a highly substantial effect on the hatching speed of seabass eggs. Further testing revealed that the eggs hatched in 14 h and 40 min, which had the fastest seabass roe hatching time (35 ppt), and 15 h and 20 min for the 20 ppt salinity treatment. The 35 ppt salinity treatment had the highest hatchability rate (80.67%), while the 20 ppt salinity treatment had the lowest percentage (71.78%). It can be concluded that a salinity of 35 ppt provides a good embryo development response where there are no embryos that fail to develop, have the shortest hatching times of 14 h and 40 min, and produce the highest hatchability of eggs compared to other salinities.
Estimation of Suspended Particulate Matter Using Landsat 9 Imagery: Generating Algorithms and Spatio-Temporal Distributions Maslukah, Lilik; Sadewo, M. Firouz Dimas; Rochaddi, Baskoro; Widada, Sugeng; Wirasatriya, Anindya; Wisha, Ulung Jantama
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 1 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.1.15-28

Abstract

The fluctuation of suspended particulate matter (SPM) is essential to the biogeochemical cycle and ecological health of coastal waters. Anthropogenic activities potentially trigger an increase in SPM, so it needs to be monitored continuously. Spatial and temporal monitoring of SPM can be carried out cost-effectively with broad coverage using a remote sensing application. This study aims to build the SPM algorithm and estimate its temporal variability. The algorithm model in this study is based on an empirical formula between field data and reflectance data with the same acquisition. Water samples were taken from 100 stations in July 2022. Half were used for model building and the other for model validation. Suspended Particulate Matter was determined gravimetrically and estimated their temporal variability was based on Landsat 9 image records from December 2021 - November 2022. The results of the analysis show that the best algorithm for SPM estimation can be built based on coastal aerosol canals (B1), blue canals (B2), and green canals (B3) with the accuracy test result of (R2 = 0.68; RMSE = 5.551 mg.L-1; MAPE= 7.07%; Bias= 0.28). The SPM temporal fluctuations were generally higher in the west monsoon and lowered in the east monsoon, ranging from 30 to 70 mg.L-1. On the other hand, the spatial distribution shows a higher magnitude in the estuary than in the offshore waters, with a deviation of about 30 mg.L-1. Regional authorities can use the results obtained to improve the management of coastal water quality and monitoring systems.
Assessment of Sensitivity and Validity Hydrodynamic Model in Cisadane Using Delft3d Flow Model Pasma, Gumilang Ramadhan; Suharyanto, Hamzah Haru Radityo; Khoirunnisa, Hanah; Wijayanti, Reni; Gumbira, Gugum; Rachman, Reno Arief
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 1 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.1.133-146

Abstract

The National Capital Integrated Coastal Development (NCICD) program was prioritized as a disaster reduction technology within the annual target of BRIN in 2022. It is a part of the North Java Coastal Integrated Development Program project. A coastal reservoir development plan at the Cisadane River estuary is one of the outcomes. In this case, hydrodynamic modelling is needed to acquire hydrodynamic properties under the existing condition of Cisadane downstream, and it applied the Delft3D-FLOW model. The bathymetric data used in this simulation was obtained from the assimilation of national bathymetric data with a grid spacing of 180 m and field survey data with a horizontal resolution of 10 m and transect spacing of 200 m seaward of the Cisadane estuary. It has interpolated in a regular structured grid with 100 m and 50 m grid spacing. In addition, other data used are three hourly wind data downloaded from the European Centre for Medium-Range Weather Forecasts (ECMWF) and the daily discharge of the Cisadane River in 2021. Astronomical water level data generated from TPXO 7.2 and TPXO 8 were used in the boundary conditions. These data are simulated using the two and three-dimensional flow model Delft3D-FLOW during November 1 – 15, 2021, using four manning coefficients (n) values, which are 0.03; 0.035; 0.04; and 0.045. The validation formulation used Normalization Root Mean Square Error (NRMSE), resulting in 5.3 - 9.6% for all the manning values and domains. The highest correlation coefficient of current velocity (u-v components) is acquired in the 10 km2 domain with 0.797 for the L3 (bottom layer).
Analyzing Sediments Assessment and Distribution Using Bathymetric Survey: A Comprehensive Study of the Abu Abdullah Canal, Southern Iraq Khaleefa, Usama Qasim; Hussein, Meelad A.; Shareef, Najed Faisal; Almayahi, Dawod S.; Chasib, Sajjad K.
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 3 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.3.301-308

Abstract

The Abu Abdullah canal, an essential part of the Garma River, serves as the feeder to the water injection station for the Basrah Oil Company's southern region's oil fields, playing a significant strategic. This study thoroughly investigates the sedimentation rate and distribution processes within this critical canal. The canal was built in the 1980s, with a depth of 3 meters planned. In 2017, RSK Company, in partnership with the Basrah Oil Company, started a comprehensive bathymetric survey of the canal to investigate its depth characteristics. The survey yielded intriguing results, revealing notable variations in depth along the canal's course. Depths ranged from 0.4 m at the canal's edges to an average of 1.6 m in the middle, indicating a significant decrease of 1.4 m in the middle region and 2.6 m at the edges. The collapse of the canal banks, induced by the proximity of Buffalo breeders' residences near the canal, is the primary source of this depth variation. Incidental entry and traversal of Buffaloes lead to gradual structural degradation of the banks, exerting a substantial influence on sediment distribution within the canal. Moreover, Buffalo standing in the middle of the canal induces compression on the channel bottom, altering the sediment transport dynamics. The study's outcomes are critical for sustainable canal management and environmental conservation. Understanding the complicated interaction between human activities and natural processes for shaping canal morphology is vital for developing effective strategies aimed at safeguarding canal banks and preserving their ecological functions. This research significantly advances the understanding of canal sediment dynamics, presenting practical applications in hydraulic engineering and environmental management.
DNA Barcoding of Anchovy in Tuban Regency as Database of Indonesian Marine Genetic Diversity Joesidawati, Marita Ika; Nursalim, Nining; Kholilah, Nenik; Kurniasih, Eka Maya; Cahyani, Ni Kadek Dita; Ambariyanto, Ambariyanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 4 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.4.383-391

Abstract

Anchovy is the main catch and the primary consumption of coastal communities in Indonesia, and its production shows an increase of more than 10% in 2021. Tuban district, in East Java, Indonesia is part of the WPP 712 (Wilayah Pengelolaan Perikanan or Fisheries Management Area) and highly produces anchovies’ fisheries. Anchovy has a small size, making it difficult to identify morphologically. This study aimed to genetically identify anchovy samples obtained from North Java (Tuban) waters. Molecular identification was conducted by utilizing Cytochrome Oxidase Subunit I (COI) gene using jg-HCO and jg-LCO primers. This study observed 12 individual samples with 623 base pair sequence length. Five species were obtained, namely four species of anchovies (Encrasicholina heteroloba, Encrasicholina punctifer, Stolephorus waitei, and Stolephorus insularis) and one species of sardines (Dussumieria elopsoides) with 99.84-100% similarity to NCBI sequences data. Anchovies typically have a streamlined body with a slightly compressed shape. Anchovies have cycloid scales, which are smooth-edged and relatively small, ranging from a few centimeters to around 20 centimeters in length. Some of the genus from the Anchovy group are Encrasicholina and Stolephorus. The phylogenetic tree reconstruction leads into four clades with a genetic distance between clades of 17,9-24,5 %. This research provides methods and data on the genetic diversity of anchovies taxa caught in Tuban, East Java. The findings are expected to support promoting new standards for healthier and more sustainable anchovy stocks in the country. Overall, this study contributes to providing valuable insights for fisheries management and conservation efforts in Indonesia.
Managing Mangrove Resources in Conflict of Interest Zones in Bangka Island's Eastern Coast Bidayani, Endang; Vieira, Lucas O.; Valen, Fitri Sil
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 2 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.2.254-260

Abstract

The east coast of Bangka Island is an area prone to conflicts of interest, due to the use of the coast for tin mining and fishing by traditional fishermen. The threat of destruction of mangrove forests due to community tin mining on the east coast of Bangka Island has caused a decline in the crab population as the main catch of local fishermen.The study aimed to analyze efforts to manage mangrove ecosystems in conflict zones. The study was conducted from June to October 2023. The primary data was obtained through interviews fishermen community, direct observation, and documentation. The data analysis methods employed utilize a descriptive approach.  Based on the survey results, the impact of tin mining activities causes a decrease in the area of mangrove forests. Reporting that the income of traditional fishermen in the productive fishing season is around IDR 65,000/day or IDR 980,000/month. Meanwhile, in the bad season, the income of traditional fishermen is IDR 13,000/day or IDR 205,000/month.  Efforts to manage mangrove resources in conflict zones include mangrove restoration and mangrove forest educational tourism. The government's enforcement of regulations regarding the prohibition of tin mining in mangrove forest areas must be more massive so that mangrove resources remain sustainable. The government must significantly enhance the enforcement of legislation pertaining to the prohibition of tin mining in mangrove forest regions in order to ensure the long-term sustainability of mangrove resources.
Exploring the Anti-Menopausal Potential of Rhizophora mucronata Lam. Ethanol Extract: A Comprehensive Study on Estrogen Receptor β Agonist Activity Ernawati, Ernawati; Adam, Moh. Awaludin; Widiastuti, Irawati Mei; Insivitawati, Era; Nikmatullah, Muhammad; Riyadi, Putut Har; Azra, Mohamad Nor
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 3 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.3.414-424

Abstract

Mangrove is a tropical forest that stores millions of benefits ecologically, biologically, and economically. Rhizophora fruit extract contained bioactive compounds components derived from natural ingredients and scientifically proven to have positive effects on health, among others, to prevent cancer, etc. This study aimed to investigate the potential of R. mucronata ethanol extract as an estrogen receptor β agonist for anti-menopausal purposes. Using a Completely Randomized Design (CRD), 25 mice were divided into five groups: a normal control group (NK), an ovariectomy control group (Ovx), and three ovariectomized groups (Ovx D1, D2, and D3) receiving different doses of the extract (200, 400, and 800 mg.kg-1 BW, respectively). The extract was administered orally, and various measurements were taken, including flavonoid content, using densitometry thin layer chromatography (TLC) and FTIR for functional group characterization. The study found a high rutin content (13.29%) in the fruit. Twelve compounds with potential estrogenic activity were identified, which were analyzed using SwissAdme software. Estradiol levels in serum increased with higher doses of the extract over four weeks. In silico and in vivo analysis showed 5 (five) selected compounds from the ethanol and ethyl acetate fractions with highest (most negative) to lowest binding affinity as candidates for anti-menopausal drugs. The administration of R. mucronata Lam. fruit extract in Ovx D1, Ovx D2 and Ovx D3 gave significantly different effects to each other on rat blood serum estradiol hormone levels. In this study, the dose 400 mg.L-1 BW rat gave P>5 increasing blood serum estradiol levels of ovariectomized rats.
Combination of Alginate and Ginger Oil as Edible Coating Formulation for Reducing Pathogenic Bacteria in Litopenaeus vannamei Amal, Ikhlasul; Yudiati, Ervia; Sedjati, Sri; Ighwerb, Mostafa Imhmed
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 4 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.4.313-320

Abstract

Litopenaeus vannamei is a world trade commodity that has a high economic value but is easily degraded. To maintain the quality, post-harvest peeled shrimp needs to be coated. The research objective was to determine the effectiveness of adding edible coatings with a formulation of alginate and ginger oil combination as a natural preservative for shrimp. The research method used was laboratory experimental with a completely randomized design (CRD). The treatments were additional peeled shrimp with different concentrations of alginate, i.e. 0 g, 1.5 g, and 3.0 g with two repetitions. The addition of 100 ml aquadest, 4 g CaCl2, 15 mL glycerol, and 1.5 mL of ginger oil was administered in every treatment. Total Plate Counts (TPC), Escherichia coli, and Vibrio cholerae were determined in initial condition, 3rd, and 6th days after the storage time in a 40C refrigerator.  The edible film test with 5 repetitions, including thickness, tensile strength, and break elongation. The results on TPC (5.00 x 105 CFU.g-1) and TPC of V. cholerae (Negative.25 g-1) show that all the treated shrimp meet the standard value (SNI 3457:2021) requirements. Most Probably Number of E. coli in alginate addition of 0 and 1.5 g i.e. <3 MPN.g-1 treatments, do not meet the requirements. The bacterial test and edible film mechanical properties showed that the addition of 3.0 g alginate was the most effective treatment compared to other treatments (α=0.05). A formulation of alginate and ginger oil combination is an effective edible coating for reducing the pathogenic bacteria of peeled shrimp L. vannamei.
Feasibility Study Area and Dissolved Oxygen Carrying Capacity of Silvofishery Pond on the Coastal Area Mardiana, Tri Yusufi; Ariadi, Heri; Rattanavichai, Wutti; Soedibya, Petrus Hary Tjahja; Linayati, Linayati
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 2 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.2.201-210

Abstract

The aim of this research are to assess the feasibility of water and soil quality in silvofishery cultivation areas and to determine the environmental carrying capacity of the cultivation. The methods employed include Water Quality Index (WQI), Soil Quality Index (SQI), carrying capacity, and correlation analysis of parameters. The concentration of COD in the silvofishery pond water ranges from 705.34-749.50 mg.L-1, and the total nitrogen content in the soil ranges from 7-8 mg.L-1. The COD parameter in water shows a strong correlation with dissolved oxygen. The soil type parameter silt is correlated with redox potential, while the clay soil type is correlated with sand soil. The variance in data for water and soil quality variables is considered significant as per cluster analysis. The WQI values range from 0.47-0.85, categorized as poor, good, and excellent. The SQI values range from 0.52-0.77, falling into the good and excellent categories. The carrying capacity of dissolved oxygen ranges from 0.7-1.99 kg.ha-1, indicating that if the DO concentration is below this range, oxygen depletion may occur in the silvofishery pond. The research results indicate that the water and soil quality in the silvofishery pond is still sufficiently suitable for silvofishery activities. The carrying capacity of dissolved oxygen in the silvofishery pond is deemed adequate for operational silvofishery activities, ranging from 14.26-15.87 kg.ha-1. This implies that the silvofishery cultivation system is capable of enhancing aquaculture productivity while minimizing environmental pollution in the surrounding aquatic areas resulting from the waste generated during aquaculture operations.
Distribution and Characteristics of Internal Waves Observed During the Expedition of Jalacitra 2-2022 Banda Putra, I Wayan Sumardana Eka; Atmadipoera, Agus Saleh; Manik, Henry Munandar; Harsono, Gentio; Purwandana, Adi; Hascaryo, Anom Puji
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 3 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.3.359-371

Abstract

Indonesian seas have been known as the hotspot for internal waves (IWs) generation sites. The sinking tragedy of the Indonesian Naval Submarine, KRI Nanggala 402 on 21 April 2021 in the northern Bali Sea was highlights the need of detecting, mapping, and characterizing internal waves in Indonesian waters are compulsory mainly in the Indonesian Archipelago Sea Lanes (IASLs). IASLs is a gateway for sea crossings which can be used by civil navigations, intercontinental trade, and foreign military. This study focused on mapping the distribution and characteristics of internal waves qualitatively using EA 600 Single beam Echosounder (SBES) of the Indonesian Naval Vessel, KRI Rigel 933 during The Jala Citra Expedition 2-2022 Banda. The measurements were conducted around the IASLs route in the Bali Waters, Banda Waters and Buru Waters. The results show that the typical high-frequency non-linear internal waves (HFNWs) with an amplitude of less than 10 m were observed intermittently during the expedition, detected mostly in the narrow passages, rough topography and shallowing waters. Typical characteristics of internal solitary waves (ISWs) were also observed with typical amplitudes of ~20 – 65 m. An ISWs extreme events found in this study verified the "turbulent water" that was reported in in the IASLs around the Underwater Seamount (US) Nieuwerkerk waters, in 1925 during the Snellius Expedition. The detection of internal wave events using acoustic equipment, the single beam echosounder is considered effective which can later be used as the guidance for marine activities in the water column.

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