bluuebunny/crossref_metadata_2025_split huggingface dataset:
Harmful algal bloom of the three selected coastal bays in Indonesia
Authors: Sidabutar T , Srimariana E S , Cappenberg H A W , Wouthuyzen S 
Published: December 2022

AbstractThe occurrences of phytoplankton bloom have recently increased in some coastal bays in Indonesia. Harmful algal blooms are now a significant problem for several coastal bays, which causes problems and economic losses to the fishing industry, harm to aquatic ecosystems, fish mortalities, and other living organisms. The negative impact also affects the marine environment, tourism, and consumer health. The most frequent algal bloom occurrences are three coastal bays: Jakarta Bay, Lampung Bay, and Ambon Bay. In particular, those three bays are the most infected areas of harmful algal bloom in this country. Samples were taken using a 20 um net plankton and directly preserved with Lugol’s solution before being identified. Some bloom maker species were identified as toxic, mainly belonging to dinoflagellates, such asPyrodinium sp, Aleandrium sp, Gymnodinium sp, andCochlodinium sp. And the species that most frequently cause a bloom in those coastal waters areSkeletonema, Chaetoceros, Trichodesmium, andNoctiluca. The nutrients, mainly nitrate and phosphate, are the main driving factor resulting from anthropogenic activities on the land that make the coastal waters eutrophic. This paper discusses the recent distribution, causes, and impact of harmful algal blooms in the three coastal bays in this country.
Proximate and mineral compositions of the green seaweeds Caulerpa lentilifera and Caulerpa racemosa from South Sulawesi Coast, Indonesia
Authors: Kasmiati K , Syahrul S , Badraeni B , Rahmi M H 
Published: December 2022

Abstract
This study aimed to evaluate the nutritional and mineral composition of the green seaweeds Caulerpa lentilifera and Caulerpa racemosa collecting from Takalar Water, South Sulawesi, Indonesia. Test of proximate analysis of seaweeds observed was ash, protein, lipid, fiber, and carbohydrate. While the test mineral compositions were phosphorus, calcium, potassium, sodium, magnesium, cuprum, manganese, zinc, ferrum, iodine. The results of the analysis showed that the proximate composition, C. lentilifera had the highest ash content (63.83%) while C. racemosa had the highest carbohydrate content of 38.18%. The results of the mineral analysis showed that C. lentillifera and C. racemosa contained macro and microminerals. The highest macromineral content is Na (10.040% and 16.280%) and followed by K (3.958% and 2.195%), Mg (59.201 ppm and 519.201 ppm), Ca (0.521% and 0.466%) and P (0.270% and 0.335%). The highest microminerals in the two types of seaweed from the largest are Fe (756.1805 and 386.1202 ppm), Mn (59.201 ppm and 519.062 ppm), Zn (10.079 ppm and 3.366 ppm), and Cu (5.496 ppm only in C. racemosa). This study revealed that C. lentilifera and C. racemosa contain constituents with proximate and mineral composition as potential sources of plant foods and good sources of mineral supplements.
The potential of skipjack fish (Katsuwonus pelamis) in the Flores Sea of South Sulawesi
Authors: Baso Aris , Tahang Hamzah , Amiluddin  , Kasri  , Carda Muhammad Aldair Mukstofa 
Published: December 2022

Abstract
The purpose of this study is to analyze the marketing efficiency of skipjack fish in the Flores Sea of South Sulawesi. This research was carried out in September - December 2021 with due observance of the Covid-19 health protocol. The method of research used is a survey method. The sampling method used is stratified random sampling. Analysis of the data used is descriptive analysis, marketing margin, marketing cost and marketing efficiency. The results showed that the skipjack fish marketing channel in the Flores Sea, South Sulawesi is efficient with efficiency value of 0.03 for Selayar Islands Regency and 0.02 for Bulukumba Regency, which means that the skipjack marketing channel is efficient because it has a value smaller than one (<1).
The use of superior common carp for a better aquaculture
Authors: Ariyanto D 
Published: December 2022

Abstract
Fish farming is an economic business activity that has been carried out for a long time in Indonesia. One of the most popular commodities cultured is common carp. In 2001, common carp production was 418,910 MT, equivalent to 63.5% of Indonesia’s national production. However, the existence of obstacles in common carp culture, especially the outbreak of KHV in 2002 and the decrease of the genetic quality of fish, indicated by the slower growth of fish, resulted in a significant decrease in common carp production. The use of lower genetic quality fish causes the efficiency of the feed used is getting lower, as indicated by the high value of the FCR. In-efficient use of feed has an impact on increasing feed waste in the cultural environment. To increase common carp production, several varieties of superior common carp have been released for the farmer. Empirically, superior fish carp have a better growth rate and are more efficient in the use of feed. Culture of these superior varieties impacted to increase in the national production of common carp, by an average of 8.7%/year. On the other hand, the culture environment is kept clean due to up to 47.0±4.8% reduction in waste.
Impact of presidential decree number 44 of 2016 on sustainable fisheries at archipelago state
Authors: Mira  , Wardono B 
Published: December 2022

Abstract
The purpose of this study is to analyze the impact of the Presidential Regulation (Perpres) Number 44 of 2016 on sustainable fisheries. Presidential Decree No. 44 of 2016 concerning business fields closed to foreign investment in Indonesia. In the results of the analysis using the models: linear trend, quadratic and exponential. Result analyzed indicated that the most suitable model is the quadratic model. The quadratic model is related to the nature of fish resources. The Gordon-Schaefer model states that fisheries with an open access management regime will lead to economic inefficiency. To prevent this economic inefficiency, several economic instruments must be applied, such as limiting efforts and quotas. One of the instruments for limiting fishing efforts is through Presidential Regulation no. 44 of 2016. Limiting efforts is positive impact for local fisherman. For example, since the foreign vessels banned from operating, small bitung fishermen, they could catch 3-6 tunas per day in 2019. In 2014, they had only been caught 1-3 tuna per day. Investment waste in a sector will eliminate the potential economic rents of fish resources. Investment waste in capture fisheries should be used for fish processing activities and aquaculture activities that will provide added value.
Performance growth and survival of Hemibagrus nemurus with probiotic application on aquaponics
Authors: Yosmaniar  , Taufik Imam , Setijaningsih Lies , Widyastuti Yohanna R 
Published: December 2022

Abstract

Hemibagrus nemurus is a freshwater catfish commodity that has high economi value and favored by the community. The purpose of study was to evaluate the growth and survival of Hemibagrus nemurus in aquaponics with the application of probiotics. The research was conducted in Sukawening Dramaga Bogor. Using 6 units of tarpaulin ponds measuring 20 x 3.0x 0.8 m filled with 3 M 3 of water, each pool is equipped with an aquaponics unit with an upstream system using lettuce and eggplant. The experiments, namely using probiotics and without using probiotics with 3 replication. The test fish used is 16.5 sd 0.2 g/individu The probiotics used at a dose of 10 ml/M3. Given every 5 days. Fish were given commercial feed of 4 % at 50 days rearing and then 3% until the end of the study with feeding times/day (morning and afternoon). The test parameters were SGR, survival, absolute weight, FCR and water quality. The result showed that the application of probiotic RIFA can increase the growth and survival of the fish, improve water quality and increase plant productivity.
The effect of various doses of vitomolt as a feed additive on meat quality and feed nutrient retention in mud crab fattening
Authors: Sari Nur Intan , Fujaya Yushinta , Aslamyah Siti 
Published: December 2022

Abstract
Vitomolt is a feed additive in fattening mud crabs (Scylla olivaceae). The study aimed to determine the best dose of vitomolt for meat quality and nutrient retention for fattening Scylla olivaceae. It was conducted at the Educational Farm of Universitas Hasanuddin, Barru Regency, Indonesia. The treatments were various doses of vitomolt in the feed, which 0, 200, 400, 600 mg kg−1 of feed. Rearing was held for 60 days and fed 5% body weight daily. The analysis showed that the dose of vitomolt in the feed affected the percentage of meat carcass weight, fat content, fat retention, and crab energy retention. However, it did not affect protein content, crude fiber, Nitrogen-Free Extract (NFE), ash content, and crab protein retention. The best percentage of meat carcass weight at a dose of vitomolt 400 mg kg−1 and same from a dose of 200 mg kg−1, while the best fat content, fat retention, and energy at a vitomolt dose of 600 mg kg−1 and different from a dose of 400 and 200 mg kg−1, but different from the control. Vitomolt with a 200 mg kg−1 of feed is the best dose to produce the highest meat quality and nutrient retention in fattening crabs.
Selection of prospective probiotic bacteria from the intestines of Rabbitfish, Siganus guttatus as a fermenter for fish feed raw materials
Authors: Kamaruddin  , Haryati  , Aslamyah Siti , Karim Yusri , Mulyaningrum Sri Rejeki Hesti , Tampangallo B.R. 
Published: December 2022

Abstract
Rabbitfish is classified as herbivorous fish by utilizing plants as a staple food, so it has the potential to contain microflora in the digestive tract. The study aimed to select bacteria from the intestines of Rabbitfish as probiotic candidates for degradation of feed ingredients. At the beginning of the study, microbial dissolution of the intestines of 10 Rabbitfish measured weight and body length 127 ±20.1 g and 191.4±1.17 cm, healthy and not deformed, obtained from the waters around the island of Salemo, Regency. Pangkep. At this stage, they have successfully isolated 72 isolates. Then make a selection of bacteria based on the activity of extracellular enzymes by testing the hydrolysis ability of starch using Zobel media adding 1% soluble starch, protein hydrolysis using Zobel media adding 1% skim milk, cellulose hydrolysis using Zobel media adding 1% CMC. The ability of the insulator to hydrolyze starch ranges from 0.4 cm; to protein to 2.4 cm; cellulose to 1.5 cm. Based on these results, 10 isolates were selected as probiotic candidates, namely 411; 413; 422; 427; 430; 434; 437; 452 and 455. The next stage of the pathogenicity test of 10 selected isolates. Each isolate with a density of 106 CFU/mL was injected into 5 juveniles of healthy Rabbitfish intramuscularly as much as 0.1 mL. Monitoring is carried out daily for 10 days after infection to evaluate clinical signs of the disease in test fish. The results obtained showed that no symptoms of pain, injury, or death were found, so it was concluded that the bacterial isolate was not pathogenic.
Tilapia aquaculture water quality in response to the addition of fermented herbal extract
Authors: Fujaya Yushinta , Azis Hasni Yulianty , Hidayani Andi Aliah , Badraeni  , Arifin Namiratul Hasanah , Khor Waiho , Fazhan Hanafiah , Nurhidayat  , Hardi Esti Handayani 
Published: December 2022

Abstract
This study aims to find a suitable Fermented Herbal Extract (FHE) dose to reduce ammonia levels in tilapia cultivation. This research was carried out for one month, from August to September 2021, at Fish Hatchery Laboratory of Marine Sciences and Fisheries Faculty, Hasanuddin University. The study was conducted using a completely randomized design with six treatments and three replications. The treatments were various doses of FHE added to the cultivation water, including 0 ppm, two ppm, four ppm, six ppm, eight ppm, and ten ppm. The juvenile tilapia measuring about 5 cm body length stocked with five fish for each aquarium. Water quality like Dissolved Oxygen, Temperature, pH, Nitrate, Nitrite, and Ammonia content was measured in this study. The results showed that adding FHE to tilapia culture media affected the ammonia concentration. In this study, six ppm of FHE treatment resulted in the lowest ammonia concentration on the 10th and 12th days of observation.
Mapping beje pond as fish source in a tropical peat swamp using Landsat 8 OLI-TIRS imagery
Authors: Aguswan Y , Gumiri S , Sukarna R M , Permana I 
Published: December 2022

Abstract
Tropical peatlands in Indonesia are severely degraded due to unsustainable logging, conversion to plantations, poor drainage, and repeated fires. Traditional communities in Central Kalimantan used to build “beje” ponds for fishing and paludikulur farming system (agrosilvo fishery) in deep peatlands area that are frequently flooded. However, hardly reached spot in peat swamp makes areas suitable for beje difficult to find. This study aims to map the location suitable for beje using Normalized Difference Water Index (NDWI) from Landsat 8 OLI imagery. Canopy results from the NDWI were used as a reference for field investigations at nine sites from each NDWI class. The classification test results show that NDWI is able to distinguish dry and wet areas in tropical peatlands, with a manufacturer accuracy of 83.3% and user accuracy of 84.9%. As a result, the area suitable for beje ponds development is ±9,616 ha, or 6.2% of the total area studied.
Identification of potential areas for upwelling based on characteristics of eddies event in the Bone gulf
Authors: Hidayat R , Zainuddin M , Safruddin  , Wiyono E S 
Published: December 2022

Abstract
The Bone Gulf is one of the waters with massive potential for catching pelagic fish. The potential for catching fish is associated with oceanographic events in the waters. This study aims to see the potential for upwelling in the eddy occurrence areas. The spatial analysis method will be used to see the potential for upwelling in the area of the eddy occurrence and will be associated with sea surface temperature parameters and chlorophyll-a as a fertility variable. The results of this study indicate that eddy events occur every month in the Bone Gulf waters. In addition, it can be proven that every eddy occurrence is not a guarantee for the emergence of upwelling areas simultaneously. However, several eddy events with high current velocities were seen to cause a decrease in temperature in the middle of the eddy and increase the chlorophyll-a concentration in that area. In addition, the suitability of this event is also shown from the time of upwelling, which occurs several months before the peak month of fishing in the Bone Gulf. This research is expected to be the basis for the sustainable development of fisheries.
Water quality analysis in Tempe Lake Wajo Regency, South Sulawesi
Authors: Rahim Sri Wahyuni , Takhir Qina Amalia , Kudsiah Hadiratul , Rukminasari Nita , Suwarni  , Yanuarita Dewi 
Published: December 2022

Abstract
Tempe Lake is one of the largest lakes in South Sulawesi, with a 47.800 ha area and heavily utilized, leading to water quality degradation. This research aims to analyze water quality parameters using the NSF Water Quality Index. The research was conducted from June until August 2021. The sampling was done in three stations. Station I located in the middle of Tempe Lake; Station II, located close to the rice field area; and Station III, located close to the area of residence. The water quality analysis was done in the Laboratory of Water Quality, Faculty of Marine Science and Fisheries, Hasanuddin University, Makassar. There were eight water quality parameters measured: temperature, turbidity, pH, TSS, DO, BOD, phosphate and nitrate. The results showed that all parameters, except phosphate, still met the Standard of PP No. 22/2021 of Water Quality Management and Pollution Control. Based on the NSF Water Quality Index, the Lake Tempe is categories as medium.
Computational discovery of two-dimensional rare-earth iodides: promising ferrovalley materials for valleytronics
Authors: Sharan Abhishek , Lany Stephan , Singh Nirpendra 
Published: December 2022

Abstract
Two-dimensional Ferrovalley materials with intrinsic valley polarization are rare but highly promising for valley-based nonvolatile random access memory and valley filter devices. These ferromagnetic materials exhibit valleys at or near the Fermi level with intrinsic magnetism. The strong coupling between magnetism and spin–orbit coupling induces intrinsic valley polarization. Using Kinetically Limited Minimization, an unconstrained crystal structure prediction algorithm, and prototype sampling based on first-principles calculations, we have discovered new Ferrovalley materials, rare-earth iodides RI2, where R is a rare-earth element belonging to Sc, Y, or La-Lu, and I is Iodine. The rare-earth iodides are layered and demonstrate either 2H, 1T, or 1T
d
phase as the ground state in bulk, analogous to transition metal dichalcogenides (TMDCs). The calculated exfoliation energy of monolayers (MLs) is comparable to that of graphene and TMDCs, suggesting possible experimental synthesis. The MLs in the 2H phase exhibit ferromagnetism due to unpaired electrons in d and f orbitals. Throughout the rare-earth series, d bands have valley polarization at K and

K
‾

points in the Brillouin zone in the vicinity of the Fermi level. Large intrinsic valley polarization in the range of 15–143 meV without external stimuli is observed in these Ferrovalley materials, which can be enhanced further by applying an in-plane bi-axial strain. These valleys can selectively be probed and manipulated for information storage and processing, potentially offering superior performance beyond conventional electronics and spintronics. We further show that the 2H ferromagnetic phase of RI2 MLs possesses non-zero Berry curvature and exhibits anomalous valley Hall effect with considerable anomalous Hall conductivity. Our work will incite exploratory synthesis of the predicted Ferrovalley materials and their application in valleytronics and beyond.
Imaging current control of magnetization in Fe3GeTe2 with a widefield nitrogen-vacancy microscope
Authors: Robertson Islay O , Tan Cheng , Scholten Sam C , Healey Alexander J , Abrahams Gabriel J , Zheng Guolin , Manchon Aurélien , Wang Lan , Tetienne Jean-Philippe 
Published: December 2022

Abstract
Van der Waals (vdW) magnets are appealing candidates for realising spintronic devices that exploit current control of magnetization (e.g. switching or domain wall motion), but so far experimental demonstrations have been sparse, in part because of challenges associated with imaging the magnetization in these systems. Widefield nitrogen-vacancy (NV) microscopy allows rapid, quantitative magnetic imaging across entire vdW flakes, ideal for capturing changes in the micromagnetic structure due to an electric current. Here we use a widefield NV microscope to study the effect of current injection in thin flakes (∼10 nm) of the vdW ferromagnet Fe3GeTe2 (FGT). We first observe current-reduced coercivity on an individual domain level, where current injection in FGT causes substantial reduction in the magnetic field required to locally reverse the magnetisation. We then explore the possibility of current-induced domain-wall motion, and provide preliminary evidence for such a motion under relatively low current densities, suggesting the existence of strong current-induced torques in our devices. Our results illustrate the applicability of widefield NV microscopy to imaging spintronic phenomena in vdW magnets, highlight the possibility of efficient magnetization control by direct current injection without assistance from an adjacent conductor, and motivate further investigations of the effect of currents in FGT and other vdW magnets.
Wavelength dependence of polarization-resolved second harmonic generation from ferroelectric SnS few layers
Authors: Moqbel Redhwan , Chang Yih-Ren , Li Zi-Yi , Kung Sheng-Hsun , Cheng Hao-Yu , Lee Chi-Cheng , Nagashio Kosuke , Lin Kung-Hsuan 
Published: December 2022

Abstract
Two-dimensional group-IV monochalcogenides such as GeS, GeSe, SnS, and SnSe were theoretically predicted as multiferroic materials with two or more ferroic properties. However, most of their bulk crystals are stacked layer by layer with an antiferroelectric manner, which lose the macroscopic in-plane ferroelectricity. In this work, we studied SnS in which the layers are stacked in a ferroelectric manner both experimentally and theoretically. We utilized polarization-resolved second harmonic generation (SHG) microscopy to investigate numerous flakes of ferroelectric SnS few layers on mica substrates. We found the SHG polar patterns dramatically varied in the range of 800 nm and 1000 nm due to the frequency-dependent SHG susceptibilities. First-principles calculations have been performed to study the frequency-dependent and layer-dependent SHG susceptibilities in the ferroelectric SnS with AA and AC stacking orders. The variation trend of calculated SHG polar patterns as a function of frequency agrees well with that of the experimental results. Since polarization-resolved SHG is a noncontact and nondestructive technique to determine the crystal orientation, understanding of its properties is important, especially for monitoring the transition of different ferroic phases.
Preparation and mechanism of silicate-based sintering material from large amount of steel slag
Authors: Ma Minglong , Yang He , Bai Bing , Xie Guiquan 
Published: December 2022

Abstract
In this paper, silicate-based sintering materials (SBSM) were prepared by high-temperature sintering process with steel slag as the main raw material. By strictly controlling the particle gradation of steel slag, the content of steel slag in SBSM was increased to 70%, to realize the efficient resource utilization of steel slag. The phase composition and micro-morphology of the SBSM were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The flexural and compressive strength of the SBSM were tested by the full-automatic compression and folding machine. The results show that the main phases of the SBSM are anorthite and quartz, and the existence of anorthite is benefit to improve the mechanical properties of the SBSM. An appropriate proportion of small-size steel slag (more than 100 mesh) can promote the reaction process, and improve the flexural and compression strength of the samples. However, excessive small-size particles of steel slag lead to a large amount of liquid phase in the reaction process, which makes the aggregate react with the matrix. The strength of the sample decreases with the decrease of its resistance to external forces. The water absorption of the samples decreases with the increase of the steel slag with small-size particles.