bluuebunny/crossref_metadata_2025_split huggingface dataset:
Coral recruitment and its relationship to hard coral cover in the Derawan Islands, East Kalimantan
Authors: Giyanto  , Dewi R , Azkiyah B U 
Published: February 2023

Abstract
Coral recruitment is the process when coral larvae settle to the substrate and establish themselves as a reef community. The success of coral recruitment is very important for the sustainability of coral reefs in an area, including the Derawan Islands which develop underwater tourism. Observations on coral reef recruitment were carried out in the Derawan Islands. This study aimed to determine the density of coral recruitment, hard coral cover, and the relationship between coral recruitment and hard coral cover. Data were collected using the Underwater Photo Transect method at 11 stations in the Derawan Islands. The results showed that coral recruitment in the Derawan Islands was low, ranging from 1.41 to 3.13 colonies.m−2. Hard coral cover was categorized as “moderate” with an average of 28.04% (+SE=3.63%). The relationship between coral recruitment and hard coral cover occurred for medium-sized juvenile corals (3-6 cm). Their negative relationship was shown by the presence of more medium-sized juvenile corals in areas with lower hard coral cover. The large availability of stable substrates such as DCA in areas with low hard coral cover can increase the potential for coral reef ecosystems to recover naturally.
Dissolved Pb and Cd Distribution in Cengkok Nearshore of Banten Bay, Indonesia: Processes and Mechanisms
Authors: Pramadhana D , Prartono T , Sulistiono  
Published: February 2023

Abstract
The onshore of Banten Bay has been an active zone with settlements, industries, and ports that potentially release heavy-metal containing waste. This study aims to explain the extent to which Pb and Cd may disperse in the Cengkok nearshore of Banten Bay, Indonesia. Water samples were collected monthly from April to September 2019. Analysis of dissolved heavy metals followed the APHA 2012 procedure. The water quality conditions of the Cengkok nearshore varied during the study period. The distribution of dissolved Pb and Cd in April, June, July, and August are generally undetected although they were found in May ranging <0.002 - 0.011 mg/L Cd and <0.002 - 0.008 mg/L Pb. In September, Cd and Pb were found at all locations varying 0.007 - 0.014 mg/L and 0.004 - 0.042 mg/L, respectively. Cd and Pb distribution patterns varied and could indicate both the riverine effect and coastal processes. Cd and Pb were found discontinuously and disperse differently, indicating the effect of monthly seasons and coastal dynamics.
Epipelic diatom assemblages to determine water quality in the Tuntang River downstream, Demak, Central Java
Authors: Al Falah M H , Soeprobowati T R , Hadiyanto  
Published: February 2023

AbstractTuntang River downstream, located in the Demak Regency, Central Java, frequently experiences floods caused by sedimentation, which has occurred continuously since 1970. Changes in land use resulted in ample surface runoff water. The phenomenon affects society’s activities around the Tuntang River downstream which can hinder their activities. The study aimed to analyze diatoms with a biological index and investigate their effect on water quality. Diatoms are one of the bioindicators describing water quality in the river. The sampling technique was used through purposive sampling by selecting four stations along the Tuntang River downstream. The extraction method of sediment was carried out with HCl and H2O2as the solution. The results showed 59 species with 38363 individuals/gram from all research stations. The results showed the highest diversity index (H’) at station 4 (2.96), the highest uniformity index (e) at station 3 (0.68), and the highest dominance index (D) at station 1 (0.11), respectively.Nitzschia paleaindicates the waters containing high C organic and meso-eutrophic based on the dominant species. The results’ findings are expected to become references for river management in the Tuntang River downstream.
The offshore Foraminifera of the Togean Islands, Tomini Gulf; distribution and ecological significance
Authors: Rositasari R , Witasari Y , Wibowo S P A , Hayati N 
Published: February 2023

Abstract
The hydrological complexity, the gulf shape, and the undeveloped geological setting of the Togean Islands in the middle of the waters assembled the area to be such an interesting place to discover its ecological uniqueness. Foraminifera was widely used as proxies for various ecological aspects. Real time and retrospective studies of the vertical and horizontal distribution of foraminiferal communities on such waters are the reflection of many ecological factors in the area. The purpose of the Foraminiferal research on the offshore Togean Islands is to discover the ecological roles that directly and indirectly affect the characteristics of the vertical and horizontal distribution. The study was also referring various ecological aspects from previous studies at the research site. Sampling was carried out in September 2015 using the Baruna Jaya VIII RV in the Togean Islands waters, Tomini Gulf, through a gravity core. Foraminifera analysis was carried out at four core samples from the adjacent waters of four reef islands; Una-una, Pengempang, Togean, and Kalla at 5 m to 455 m water depths. Core samples of various lengths, from 8 cm to 34 cm were dominated by planktonic foraminifera. The dominance of planktonic taxa in reef waters indicates a robust oceanic influence to the reef islands. Upwelling events in several locations in the region as well as volcanic processes that are ongoing also play a role in the distribution of the bulk of planktonic taxa in the reef waters of Togean Islands.
Identification of eddy-induced chlorophyll in the Northeastern Natuna Sea
Authors: Mujiasih S , Soeyanto E , Hafizt M 
Published: February 2023

Abstract
We detected a robust cyclonic eddy in the northeastern Natuna Island in the Northwest Monsoon during an extremely negative El Niño-Southern Oscillation (ENSO) period (i.e., extreme La Niña event) using the Copernicus Marine Environment Monitoring Service (CMEMS) reanalysis results. In the intense La Niña event from 1999 to 2001, we also found an increase in the abundance of chlorophyll coincided with the eddy strength pattern using the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) data. Furthermore, this chlorophyll intensity may be related to the upwelling of water mass to the surface at the eddy’s center. The intensification of chlorophyll compared to the average value at the corresponding year is 83,4% (1999), 37.8% (2000), 37.3% (2008), and 72.5% (2011). In this paper, we revisit the identification of solid eddies in extreme La Niña events from 1999 to 2012 and further discuss the mechanism of the relationship between chlorophyll intensity and eddy strength, especially during the months of the extreme La Niña event.
Seasonal spreading and age of Citarum River water in the Jakarta Bay
Authors: Soeyanto E , Morimoto A , Hayami Y , Sudaryanto A 
Published: February 2023

Abstract
Citarum River is considered one of the most polluted rivers in the world, which could contribute to Jakarta Bay’s environmental quality. The purpose of this study is to predict the impact of the Citarum River on Jakarta Bay’s pollution by understanding the river’s seasonal spreading and water age. This study uses numerical ocean modeling for the largest river flowing to Jakarta Bay in 2016. The constituent-oriented age and residence time theory (CART), which supports a solution to the environmental problems in this bay, was employed to comprehend long-term river water movement. The CART’s water age calculation module is embedded in a numerical hydrodynamic model to generate the temporal variation and spatial distribution of Citarum River water. Hydrographic observations were used to validate the model in February, May, and November this year. Surface current distribution patterns, which were controlled by surface wind stress and river discharge, determined the seasonal spread of the Citarum River water distribution. Meanwhile, the average age of Citarum River water in Jakarta Bay was a few days.
Seasonal variation of mixed layer depth and thermocline thickness from the ctd argo float data in the Southern Makassar Strait
Authors: Putra D R , Natih N M N , Purwandana A 
Published: February 2023

Abstract
The Makassar Strait (MS) is directly connected to the Sulawesi Sea in the north and the Java Sea and the Flores Sea in the south and is the main route of Indonesia Throughflow(ITF). Hence Stratification of water mass in the MS is influenced by the dynamics of these waters. This study aims to describe seasonal variations of the mixed layer depth and the thermocline thickness, identify ITF water masses, and the occurrence of coastal upwelling in the southern part of the MS. The results show that the North Pacific water origin of North Pacific Subtropical Water (NPSW) and North Pacific Intermediate Water (NPIW) are dominant, with a maximum salinity characteristic of 34.6-34.7 psu in the thermocline layer and a minimum salinity of 34.5 psu in the intermediate layer. However, near-surface fresh Java Seawater appears to be dominant during the northwest monsoon (NWM-DJF) period. Seasonal variation of the mixed layer depth is much deeper (93m) and vertical gradient of temperature and salinity are much stronger due to the presence of fresh Java Sea water advected by the eastward Java Monsoon Current. However, during the southeast monsoon (SEM-JJA) period the mixed layer depth is much shallower and the thermocline layer is much thicker (198 m), Associated with much stronger ITF and upwelled colder water from the upwelling area. The coastal upwelling event during the SEM period in the study are is characterized by an increase of isotherm of 25 °C, isohaline of 34.0 psu, and isopycnal of 22.0 kg/m3 from about 75 m depth to the sea surface layer.
Simulated circulation and trajectory analysis in the Makassar Strait
Authors: Noorsyoda R M A , Naulita Y , Apriansyah  , Natih Nyoman M 
Published: February 2023

AbstractMakassar Strait conveys the main Indonesian Throughflow (ITF) pathway, as part of the global thermohaline circulation transferring heat and freshwater fluxes from the Pacific Ocean to the Indian Ocean. Dynamics and variability of the ITF and the monsoon winds system influence significantly marine ecosystem in the Indonesian Seas. The study aims to analyze sea surface circulation patterns and particle trajectories in the Makassar Strait by developing a simulation of the CROCO’s 1/36º regional general circulation model between 2017-2018. The results revealed the dynamics of near-surface layer (0 – 50 m depth) varied seasonally. The magnitude of surface current was about 0.6 m/s during the peak of northwest monsoon (NWM) flowing northward and reverse southward during the peak of southeast monsoon (SEM). The magnitude of the current intensified up to 1 m/s in the subsurface at Labani Channel and persistent flows to the southward. The thermocline transport volume was maximum during SEM with average transport about -11.00 (±1.54) Sv. The analysis shows that the particles near Balikpapan coast spreaded slowly to the north, then rotating at the center of the strait and spreaded according to the NWM and SEM.
The ocean response to El Nino Southern Oscillation (ENSO) in the Bali Sea: a model study
Authors: Adhinugraha F A C , Atmadipoera A S , Hartanto M T 
Published: February 2023

AbstractThe Bali Sea (BS) is connected to the Java Sea and Makassar Strait in the north and is one of the main outflow straits of the Indonesian Throughflow (ITF) in Lombok Strait (LS). Local ocean dynamics and their variability may be controlled significantly by the ITF. This study aims to investigate the interannual variation of circulation, mixed layer depth, and isotherm of 20°C, by performing a simulation of fine- a resolution 1/84° ocean circulation model of CROCO between 2010-2020 with a focus on El Nino 2015 (EN2015) and La Nina 2020 (LN2020) events. The model validation reproduces well the satellite-derived SST and SSH dataset with a correlation coefficient of >0.9. The model demonstrated an anti-clockwise circulation of the ITF in the BS, entering via the northern and exiting into the LS via the southern area. This circulation changes drastically during the ENSO event, where the ITF transport inflow is weaker and shallower during EN2015, compared to a much stronger and deeper ITF inflow during LN2020. Accordingly, shallower mixed layer depth and depth of isotherm of 20°C are found during EN2015, and vice versa. Coherence of these parameters with NINO3.4 is very significant (>-0.89) with a phase lag of 1.7 months.
Distribution of phytoplankton diversity and abundance in Manokwari waters, West Papua - Indonesia
Authors: Badila A , Matulessy M , Kolibongso D 
Published: February 2023

Abstract
The distribution of phytoplankton diversity and abundance found in coastal areas is usually different from the open seas due to changes in environmental parameters. The study was conducted to provide data on the distribution, diversity (H’ and Simpson’s indices), and abundance of phytoplankton in five different stations and to identify some influencing factors using canonical correspondence analysis (CCA). Three stations (Arowi, Rendani, and Maruni) are inside an embayment area and close to the center of human activity; the other two stations (Sidei and Undi) are off the bay. Total cell abundance ranged from 1,680 to 10,260 cells.m−3. The Baccilariophyceae were the most diverse and numerous classes. There were 17 phytoplankton taxa members of the classes of Bacillariophyceae (11 taxa), Dinophyceae (2 taxa), Chlorophyceae (2 taxa), and Cyanophyceae (2 taxa). The phytoplankton from Arowi station showed highest diversity (H’ = 2.38), followed by Sidey (H’ = 2.24), Undi (H’ = 2.10), Rendani (H’ = 2.06), and Maruni stations (H’ = 1.83). The ecological indices of Arowi, Sidey, Undi, and Rendani indicated quite stable communities, while Maruni was indicated unstable communities. Several species of blooming and toxic phytoplankton were found at all stations, one of which was Pseudonitczhia sp. CCA analysis showed that salinity, temperature, pH, phosphate, and current are limiting factors for the distribution and abundance of phytoplankton in Manokwari waters.
Genetic diversity of six populations of Ajamaru rainbowfish (Melanotaenia ajamaruensis) with different breeding ratios
Authors: Hayuningtyas E P 
Published: February 2023

Abstract
The Ajamaru rainbowfish (Melanotaenia ajamaruensis) is a West Papuan endemic and has been successfully cultured. The study aims to determine the genetic diversity of the Ajamaru rainbowfish ornamental fish populations that breed with differences in the breeding ratio to offspring. Tail fin samples were taken from six populations of Ajamaru rainbowfish consisting of 2 generations for DNA extraction. Three-broodstock populations (1:1, 1:2, and 3:1) spawn at seven months old, and three offspring populations. The method used was Randomly Amplified Polymorphic DNA (RAPD) analysis, primary screening using 20 primers, and four selected primers (OPG 2, OPB 6, OPH 5, and OPZ 9). Data analysis used TFPGA software to generate genetic diversity values in heterozygosity and polymorphism. The results showed the lowest genetic diversity in population 1, with polymorphism (46.99%) and heterozygosity 0.1894. The highest genetic diversity was in population 4, with descendants with polymorphism (78.31%) and heterozygosity of 0.2922. Relationships among 6 Ajamaru rainbowfish populations formed two clades based on their generation. Improving genetic quality in the breeding of Ajamaru rainbowfish can be done through selective breeding with a breeding ratio of 1:1 or the full-sib broodstock for higher genetic diversity values.
The use of stereo cameras and artificial intelligence data to support capture fisheries landing data monitoring
Authors: Wibowo S , Hargiyatno I T , Faizah R , Natsir M 
Published: February 2023

Abstract
Reliable data and data collection are important key factors in realizing sustainable fisheries management. Landing data collected by the fishing port authority through has issues with coverage and accuracy. The fast development of image processing and artificial intelligence (AI) analysis opens the possibilities of automatic catch monitoring and data collection in the fishing port. This paper aims to develop a catch data collection program in fishing ports based on stereo camera video monitoring which AI processes. The first version of the devices, FishQi-L (Fish Quantitative Intelligence in Landing site), was developed. FishQi-L consisted of a set stereo camera and a pre-programed JETSON Nano image/video processor. The stereo camera allows image size quantification, size estimation, and spatial mapping capabilities. FishQi-L was able to detect the character and dimensions of objects, the trial object in Pekalongan was “Basket” with mean average precision (mAP) of the detection was 84% and 0.4387 losses. To increase the accuracy and reliability of the systems, we need to increase the number of data and data training iterations.
The effectiveness of brood stock management in captive breeding of marine ornamental Fish
Authors: Hadie L E , Kontara E K M , Kusdiarti  , Putri A W M 
Published: February 2023

Abstract
Nowadays, the trade in marine ornamental fish is growing to be a multimillion-dollar industry. Because marine ornamental fish are successfully being bred in captivity, the industry can flourish. The breeding process is progressively applied through collecting fish from their natural habitat, inventory and domestication. An important stage in the breeding process of marine ornamental fish is the efficient management of brood stocks. A considerable number of initial populations become one of the keys to success in breeding marine ornamental fish. The principle of high genetic diversity in populations at the beginning of the collection is also an important indicator of the sustainability of the breeding process. The study aims to evaluate the management of brood stocks for marine ornamental fish in captive breeding. The observed parameters are the number of brood stocks populations, effective population size, and the utility of inbreeding in a population. The success of its cultivation is determined by the genetic diversity in the basic population which needs to be monitored from the start of the captive program.
Tilapia growth performance and body physical index given synbiotic feed at different salinities
Authors: Rahmi R , Akmal A , Nisaa K , Sudrajat I , Relatami A N R , Tampangallo B R , Ikbal M 
Published: February 2023

Abstract
Tilapia saline is a fishery commodity with a fairly large market prospect but has problems with slow growth performance, affecting the speed of its production. This study aims to determine the best growth performance with the body’s physical index of tilapia at different salinities using the synbiotic feed. The synbiotic feed is given with probiotic Bacillus subtilis 105 CFU/mL density and banana flour prebiotic 1%. This study used five different salinity treatments (A. 0 ppt; B. 5 ppt; C. 10 ppt; D. 15 ppt; E. 20 ppt) with a weight of tilapia 3,35±0,5g each 20 fish/aquarium. The results showed that mortality, FCR, weight gain (WG), and feed efficiency showed significant results in the 15 ppt salinity treatment compared to other treatments. The HIS, DSI, and Condition Factor (K) values were not significantly different (P>0,05), but the IPF values were significantly different (P<0,05) from other treatments. The average treatment at 15 ppt salinity gave optimal growth performance and physical body index, especially IPF in tilapia fry.
Applying edible coating based on chitosan and liquid smoke on the quality and microstructure of barracuda fish sausage (Sphyraena sp.)
Authors: Swastawati F , Antami H A , Purnamayati L 
Published: February 2023

AbstractBarracuda fish has abundant nutritional value and can be processed into a variety of products, including sausages. This research has been carried out to improve the quality of barracuda fish sausage during storage. Chitosan was chosen as an edible coating because of its antibacterial properties. However, it cannot dissolve at neutral pH, so the liquid smoke is used as a solvent and is expected to give maximum results. The best formulation of edible coating is 1% chitosan and 3% liquid smoke, applied to the sausage by immersion, then stored at cold temperature ± 5°C for 12 days with test intervals of 0, 4, 8, and 12 days. Edible coating treatment had a significant effect (p<0.05) on product quality. Fish sausage with coating has a more even and slightly loose microstructure. The structure without coating forms lumps and more cavities. The gel strength of coated sausage until day 12 was higher (2624.29 ± 9.02) than sausage without coating, on day 12, the sensory value on coated sausage was 7.35. The moisture and protein content of sausage coating on day 12 is 67.94% and 11.80%, and the total bacteria is 4.34 colonies/g. Barracuda fish sausage with edible coating has met the standard of SNI 7755-2013.
Changes in mineral content and vitamin A of cobia (Rachycentron canadum) due to the steaming process
Authors: Nurjanah  , Suwandi R , Aisyah E N , Hidayat T 
Published: February 2023

Abstract

Cobia (Rachycentron canadum) is a commodity that has the potential to be cultured, but little information about the nutritional content of those fish. This study aimed to determine the effect of the steaming process on the chemical composition, mineral, and vitamin A of cobia from Balai Besar Pengembangan Budidaya Laut Lampung. Steaming lowered the chemical composition of cobia meat including moisture content, ash, fat, and protein on a dry based. The steaming process affected the decreasing vitamin A, and minerals content (calcium, sodium, phosphorus, magnesium, and zinc) and showed no effect on iron and potassium content. The highest mineral loss happened after steaming to magnesium (140 mg/100 g) and the lowest one was iron (0.004 mg/100 g). Steaming lowered the vitamin A content of cobia meat up to 42.36%.
Identification of bacterial communities related to handling in commercial white-leg shrimp (Litopenaeus vannamei) using metagenomic analysis
Authors: Abdullah A , Pratama R , Sauqi S D A , Nurhayati T , Sofyan  
Published: February 2023

AbstractPost-harvest handling, which includes the use of cold chains and proper hygiene, plays a critical role in maintaining fish quality and food safety. The bacterial community in white-leg shrimp will be affected by differences in the level of hygiene used in traditional and modern markets. This study was aimed to isolate bacterial DNA and identify bacterial communities on the surface of shrimps sold in the commercial market using metagenomic analysis. The research methods covered the isolation of bacterial DNA followed by the metabarcoding analysis of 16S rRNA and bioinformatics analysis. The sequence abundance of bacteria in White-leg shrimp samples were dominated by the genusMyroides, with a relative abundance of 49.18% in traditional markets and 84.89% in modern markets. Bacterial DNA from the skin surface of shrimp from traditional and modern markets has been isolated. The samples of shrimp from traditional markets had a higher relative abundance and diversity of bacteria than samples from modern markets.