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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 12 Documents
 1   2 
Search results for , issue "Vol 28, No 1 (2023): Ilmu Kelautan" : 12 Documents clear
Effect of Extreme ENSO and IOD on the Variability of Chlorophyll-a and Sea Surface Temperature in the North and South of Central Java Province Kunarso Kunarso; Dwi Haryo Ismunarti; Azis Rifai; Bayu Munandar; Anindya Wirasatriya; Raden Dwi Susanto
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.1-11

Abstract

Chlorophyll-a (chl-a) and Sea Surface Temperature (SST) are important indicators of air-sea interaction and primary productivity. It has been widely known that the variability of chl-a and SST in the waters of Central Java Province (CJP) is influenced by the monsoonal cycle. Previous studies did not clearly describe the variability of chl-a and SST when compared to other cycles. This present study investigated the variability of chl-a and SST influenced by monsoonal cycles, IOD, and ENSO in both CJP waters. Our analysis is based on satellite observations and uses daily data to compile climatological data. The analysis found differences between the variability of chl-a and SST during the monsoonal cycle and ENSO-IOD extreme conditions. During the monsoonal cycle, the maximum (minimum) chl-a (SST) in northern CJP is 0.7 mg.L-1 (28.5ºC) is observed in the West Monsoon, and in the southern CJP is 1.5 mg.L-1 (25.5ºC) is observed in the East Monsoon. In addition, the analysis reveals that the ENSO and IOD extremes do not clearly alter the variability of chl-a and SST in the northern CJP. However, ENSO and IOD extremes have clearly altered the variability of chl-a and SST in the southern CJP. The highest impact to variability of chl-a and SST occurred during IOD+ extreme (2019), where the range of value chl-a (SST) in south CJP is 0,35–4,57 mg.L-1 (23,29 – 30,49ºC). The value of chl-a (SST) is greater than 4 mg.L-1 (less than 24ºC) are observed in the east monsoon. It is caused by the intensity of lifting the mass of water from deeper waters to the sea surface, which possibly supplies the nutrients in the surface waters. The result of the investigation showed that the increasing of chl-a and decreasing of SST in the northern CJP dominant by monsoonal cycle and southern CJP dominant by monsoonal cycle and ENSO – IOD. 
An Evaluation of a 1/18o Resolution Regional Ocean Circulation Model of CROCO in the Southern Sunda Shelf Apriansyah Apriansyah; Agus S. Atmadipoera; Indra Jaya; Dwiyoga Nugroho; Mohd. Fadzil Akhir
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.12-26

Abstract

The Coastal and Regional Ocean Community Model (CROCO) was applied to simulate the three dimensional ocean circulation on the southern Sunda Shelf with a horizontal resolution of 1/18o and 40 vertical layers. This configuration is called as CROCO18-SSS. The initial and open boundary conditions were derived from a global reanalysis product at a resolution of 1/12o from the Copernicus Marine Environment Monitoring Service (CMEMS). The regional model was driven by atmospheric, tides, and river discharges data from a wide variety of datasets, each with a different resolution. To test the model performance and capabilities of the CROCO18-SSS model outputs including sea level anomaly, current velocity, temperature, salinity, and volume transport, we have compared in the simulation results with other reanalysis product and satellite-derived datasets. The CROCO18-SSS model outputs reproduced the regional ocean circulation well from observations and reanalysis products. For example, the reversal of the monsoonal current in the southern sunda shelf, as well as strong persistent southward Makassar throughflow and their interaction in the southern Makassar Strait, can be seen clearly. The vertical structure of the zonal current component was comparable to that of the reanalysis product reference. The seasonal shift in temperature and salinity, with the water becoming colder and saltier during the northwest monsoon and warmer and fresher during the southeast monsoon, was also accurately reproduced by the  CROCO18-SSS model.  Additionally, the mean volume transport calculated by the CROCO18-SSS model for the Makassar and Karimata Straits was comparable to that reported in previous studies.
Artificial Propagation of Pomadasys hasta (Bloch, 1790): A Key to Reach Sustainable Aquaculture Shawon Ahmmed; Mizanur Rahman Washim; AKM Shafiqul Alam Rubel; Debashis Kumar Mondal; Md. Hashmi Sakib; Yahia Mahmud; Md. Latiful Islam
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.37-48

Abstract

Reproduction of Pomadasys hasta was studied in captivity to establish an induced breeding protocol and larvae rearing tactics. Three distinct hormones viz., human chorionic gonadotropin (HCG), luteinizing hormone-releasing hormone analogues (LHRHa) and salmon gonadotropin hormone-releasing hormone (S-GnRHa) were injected to matured brooders in treatment 1 (T1), treatment 2 (T2) and treatment 3 (T3) but only 0.9% NaCl used in T4 as a control. In each treatment, three experimental trails, E1 (♀40:♂20 µg.kg-1), E2 (♀50:♂25 µg.kg-1) and E3 (♀60:♂30 µg.kg-1) were conducted along with three replications of each trail in order to optimize the hormone dose for the target species. The obtained results have aroused much attention as this is the first breakthrough on induced breeding of a grunter in the Indian subcontinent. Variation in fertilization rate, latency period, egg output and hatching rate in response to different treatments and trails were revealed here. Spawning was occurred between 33-48 h of injection in all the experiments at 17-25°C water temperature. Above all, the highest fertilization (95.45±2.34) and hatching (75.45±4.07) rates were observed in E2 of T2. After 22-26 h of fertilization, the larvae emerged from the egg membrane and the newly hatched larvae were 1.6-1.8 mm in length. Turning larvae into juveniles was noticed by 40–45 days post-hatch (dph) with scales on the entire body surface. The total length was recorded as 43.5±2.1 mm and average body weight as 0.7±0.2 g at 95 dph. This investigation unlocked a track for producing seed of P. hasta in a commercial hatchery for a sustainable aquaculture without hampering their wild stock.
Sexual Maturity and Macronutrient Contents in Diopatra sp. (Onuphidae, Polychaeta) Maintained at Different Salinity Levels Eko Setio Wibowo; Mellya Rizki Pitriani; Farida Nur Rachmawati; Untung Susilo; Eko Setiyono; Atang Atang; Phuping Sucharitakul; Joko Pamungkas
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.49-56

Abstract

Diopatra sp. (Onuphidae, Polychaeta) is an economically important polychaete species commonly used as a fishing bait by local anglers in Cilacap, Central Java Province. Some biological aspects of this local species, however, have not been studied yet. The aim of this research was to see the effect of salinity levels on the sexual maturity and the macronutrient contents of the animals. Diopatra specimens in the present study were collected from the intertidal mangrove habitats of Jeruklegi Village, Cilacap, in sexually immature condition. The worms were then transported to the laboratory and were maintained in containers with four different salinity levels, i.e. 10, 15, 20 and 25 ppt over the next two months. The sexual maturity of the animals were observed based on the presence or absence of coelomic gametes. Proximate analysis was performed to determine macronutrient contents of the animals. The effect of salinity levels on the animals' sexual maturity and macronutrient contents was analyzed using one-way ANOVA. The results showed that salinity levels did not significantly affect the sexual maturity level of Diopatra worms (p > 0.05). Similarly, they did not affect the protein and fat contents, but impacted the carbohydrate content of the animals (p < 0.05). The protein and the fat contents in Diopatra sp., i.e. 41–43% and 6–9%, respectively, met the amount required to be used as shrimp broodstock and fish feeds. While the species has the potential for use in local aquaculture, the annual reproductive cycle as well as the identity of the species, however, require further research.
Effect of Stream River and Tidal on the Suspended Sediment Concentration of Kuala Langsa Estuary, Aceh, Indonesia Irwansyah Irwansyah; Faiz Isma; Yulina Ismida; Muhammad Fauzan Isma; Suliadi Firdaus Sufahani; Helmy Akbar
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.27-36

Abstract

Kuala Langsa estuary is a semi-closed zone where there is an exchange of two water masses between river and tidal of the Malacca Strait. The exchange of those two water masses occurs as a physical result of fluctuating estuaries. This caused Suspended Sediment Concentration (SSC) continue to increase as the estuary is the final distribution point for sediment brought from upstream by erosion in the Langsa River. This sediment contributes to the silting of Langsa estuary. This is caused the KRI dr. Soeharso Hospital to be unable to dock at the Kuala Langsa Port during the 66th Surya Bhaskara Jaya Navy Operations 2017. It’s necessary to study estuary physical conditions, which include bathymetry, currents, temperature, salinity, and concentrations of floating sediment that occur as a result of the tides and river discharges. This research used quantitative and qualitative exploratory methods, analyzed a direct correlation between the measurement results, roughness coeficient, and sediment transport rate used relevant empirical equations (Duboy's, Einstein's, Rottner, Chang, Simons, and Richardson, and Lane and Kalinske aquations). This research found that the Langsa estuary is 16 km with a semidiurnal tidal type. In the Langsa estuary, it was discovered that  the highest sediment rate was at the mouth of the estuary is 10.700.739,71 ton/day-1 and the physical model of Muara Langsa has a good correlation to the results of measurements-model indicate value of CC width = 0.959 and tide CC= 0.421, This study provides initial information for conducting hydrodynamic and morphological models at the mouth of estuary.
Seasonal Monitoring of Ocean Parameter Over Green Mussel Cultivation area in West Part of Cirebon Seawater Mochamad Riam Badriana; Ashadi Arifin Nur; Arsy Ilham Hidayatullah; Abi Widyananto Prastyo; Lamona Imudyati Bernawis; Chungkyun Jeon; Ivonne Milichristi Radjawane; Hansan Park
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.69-80

Abstract

West part of Cirebon in the past suffered an extraordinary event due to poisonous food found in green mussel. It is necessary to monitor current water quality over this region since this area still used for green mussel cultivation area. In-situ measurement and laboratory analysis were done to monitor the condition of seawater around Gunungjati as part of green mussel cultivation area in Cirebon regency. Several points had been measured through CTD Valeport Midas+ in prior to measure physical (temperature, salinity, pH, chlorophyll-a, turbidity) and chemical seawater (dissolved oxygen, Nitrate, Orthophosphate, Hg, Pb, Cd concentration) characteristics, meanwhile water sample had been brought to laboratory to be checked its heavy metal concentration. Additionally, past study and data related to green poison event in Cirebon was taken account into observation and analysis. Seasonal result show slightly different value though vertical distribution data where temperature (30.1°–32.3°C), salinity (26.9–32.0 psu), and pH (7.5–8.7) are high in December but lower in July, meanwhile, chlorophyll-a (0.2–20.9 mg.L-1), dissolved oxygen (0.2–7.8 mg.L-1), and turbidity (1.3–20.1 NTU) are increasing in October. Nitrate and orthophosphate concentration find in water sample is 0.097–0.537 mg.L-1 and <0.01–0.32 mg.L-1, respectively. Parameters of Cd (<0.001 mg.L-1), Hg (<0.00014 mg.L-1), and Pb (<0.001 mg.L-1) are still below the threshold. The condition of seawater of west part of Cirebon or at cultivation area is still in moderate condition based on the national standard. Although, turbidity and dissolved oxygen is still above the standard quality.
Microplastic Bioaccumulation by Tiger Snail (Babylonia spirata): Application of Nuclear Technique Capability using Polystyrene Labelled with Radiotracer 65Zn Andhi Susetyo; Heny Suseno; Muslim Muslim; Miftakul Munir; Anung Pujiyanto; Noor Fadzilah Binti Yusof
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.81-89

Abstract

Plastic waste is a solid that is difficult to decompose but can turn into environmental microplastics. Microplastics are sizes between 0.1 μm–5 mm, highly prolific anthropogenic pollutants affecting terrestrial, freshwater, and marine ecosystems. The purpose of this study was to determine the ability of Babylonia spirata to accumulate and eliminate polystyrene microplastics. This experiment uses the nuclear applications technique. The experiment consists of two methods: manufacturing microplastics and biokinetics. The manufacture of microplastics labeled Zn-65 is based on the reaction of polystyrene sulfonate with zinc to form polystyrene sulfonate Zn resin. This microplastic labeled Zn-65 is very stable in the aquatic environment, so it is used for bioaccumulation experiments. Biokinetics includes acclimatization/adaptation of the organism for seven days, bioaccumulation consists of the organism accumulating microplastics labeled Zn-65 for seven days, and depuration for seven days that were placing the organism accumulating microplastics labeled Zn-65 in water free of contamination and biokinetics calculations include the BCF (Biocontration Factor), ku (uptake constant), ke (depuration constants), and t1/2 (half-life). The experimental results show that the ability to bioaccumulate polystyrene microplastics from seawater (BCF) is 79.2 to 304.31 ml.g-1. This bioaccumulation is affected by the microplastic content in the water. The biological half-life of the microplastic is 14.54 to 41.78 d. There is a relationship between the concentration and the Ku, Ke and BCF. the polystyrene content. The experimental results show that microplastics bioaccumulate in a marine organism so that they can move through the food chain and are ultimately harmful to humans.
Fish Stock Status Assessment in Alue Naga Waters Using A 200 Khz Single Beam Echosounder Syahrul Purnawan; Sofyatuddin Karina; Myounghee Kang; Henry Manik
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.57-68

Abstract

Monitoring fish stocks is an important part of sustainable management of fisheries resources. Conducting the current evaluation is very difficult since there are no reliable data on the potential for fisheries in the waters surrounding Banda Aceh city. The hydroacoustic method was used for the first time in the waters of Alue Naga, located north of Banda Aceh, to evaluate the condition of fish stocks. A single beam scientific echosounder with a frequency of 200 kHz was used to collect hydroacoustic data in the area. The collected data was then processed using the Sonar5-Pro software. Cell integration was carried out at an interval of 10 meters vertically with an elementary sampling distance (ESD) of 200 m. While the volume backscattering strength (SV) value tends to be the highest in intermediate layers, the target strength (TS) value was found to be maximum in deeper layer, reaching a maximum value of -49.46 dB at a depth of 51–60 m. Area density value (#.ha-1) was found to be the highest at a depth of 11-20 m, while Biomass (g.ha-1) at a depth of 21-30 m was the highest among other depth layers with a value of 1558 g.ha-1. According to the in-situ catches of Carangoides, Selaroides, Aphareus, Variola, and Priacanthidae, there are a number of potential reef fish resources in the waters of Alue Naga. The findings of this study strongly support the conclusion that the hydroacoustic method effectively provides comprehensive information on the horizontal and vertical distribution of fish in Alue Naga waters.   
The Partial Pressure of CO2 and Fluxes of CO2 in Semarang Bay, Indonesia Max Rudolf Muskananfola; Nurul Latifah; Agus Hartoko; Sigit Febrianto; Johan Christian Winterwerp
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.113-124

Abstract

The CO2 characteristics of the Semarang Bay system on the Northern coast of Java were investigated to understand the roles in carbon dioxide flux. The flux of carbon dioxide at the sea surface between seawater and atmosphere is essential for mitigating atmospheric CO2.  The aims of this study were to assess the variation of CO2 partial pressure seawater (pCO2sea) and CO2 flux and to analyse the water quality variable which has the larger influence on CO2 flux in the waters of Semarang Bay. The variables in this study were temperature, pH, salinity, and DO. Different methods were adopted in the analysis of water samples: spectrophotometric to measure chlorophyll-a and phosphate and titration method to measure Total Alkalinity (TA) and Dissolved Inorganic Carbon (DIC). A CO2 meter was used to measure the CO2atm. The lowest CO2 flux value was (1.86 mmol CO2 m-2 day-1) during the morning period while the pCO2sea reached 461.04 μatm and CO2 flux 83.79 mmol CO2 m-2 day-1 at night. At noon time, with increased temperature, pCO2sea was 461.04 μatm, and CO2 flux was 83.79 mmol CO2 m-2 day-1. The high concentration of chlorophyll-a ranged between 3.55–4.11 mg.L-1.  This chlorophyll-a concentration has a negative correlation with CO2 flux, and it was found that TA and DIC concentrations have no relationship with CO2 flux. Based on PCA analysis, it was found that the variability of CO2 flux in Semarang Bay is influenced by the variability of pCO2sea, sea surface temperature and kwa (affected by wind speed).
Population Analysis of Bali Sardinella (Sardinella lemuru, Bleeker 1853) Landed in PPI Kedonganan using Length-Weight Data and Digital Analysis (ImageJ) Ni Putu Dian Pertiwi; Ida Ayu Purnama Bestari; M. Danie Al Malik; Mark Anthony Phuong
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 28, No 1 (2023): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.28.1.90-96

Abstract

Sardinella lemuru, one of the important pelagic fish in Bali Strait waters, has been reported to be in the overfishing condition. Various studies have been conducted to understand its population condition. Length-weight data has been also widely used to understand the population dynamic of S. lemuru, although data collection generally using manual direct measurement methods, which has the disadvantages if used on the enormous number of samples. Therefore, this research aims to understand the significance of S. lemuru length measurement using digital image analysis (ImageJ) compared with the manual measurement. Moreover, this research also aims to understand the population condition of S. lemuru landed in PPI Kedonganan analyzed using its length-weight data. The result indicated no significance difference between length measurement using manual methods and digital image methods, thus conclude that digital image data can be used to measure the fish length and represent the accurate measurement. Population condition analysis showed that S. lemuru population is in isometric condition (b=3); with indication of declining in the length growth pattern compared with previous research (L∞= 20.75 cm with K= 1.1); the mortality estimation showed that fishing mortality (F=1.27) was lower than natural mortality (M=2.22), with the survival rate higher on smaller size fish. This research result can be used as an addition to the S. lemuru fisheries data and can also be used as reference methods to help conduct sampling and data collection more efficiently.

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