bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of stocking densities on tilapia seed production under high salinity biofloc system
Authors: Nur A , Suryati  , Soetanti E , Suwoyo D , Purnomo S J , Soleh M 
Published: August 2023

Abstract
Provision of suitable technique for saline tilapia seed is required since demand of these species increased continuously. Most saline tilapia seed rely on sourcing freshwater fingerling and further acclimatized in brackishwater ponds. The study aimed to evaluate the effects of various fry densities on seed production parameters of tilapia under high salinity-biofloc system. Three fry densities being tested and cultured under biofloc technology (BFT) at salinity level above 20 ppt, such as: A (BFT 2.5 fry L−), B (BFT 5.0 fry L−), C (BFT 7.5 fry L−) and one treatment as control, D (Non-BFT 2.5 fry L−). The experimental set-up was completely random design and triplicated replications. Animals test were fed two times a day of 32% crude protein content and it was lasted for three weeks. Results from the experiment shown that treatment A (BFT 2.5 fry L−) performed best in term of biomass (18.00±3.61g), survival (98.00±2.00%), SGR (20.72±0.20% d−), FCR (1.72±0.38) and CF (1.59±0.17). An increasing stocking density up 7.5 fry L− will reduced survival rate, final individual weight and increased FCR. It can be concluded that production of tilapia seed at a density of 2.5 fry L− under BFT conditions performed healthy seed and best production parameters even reared at higher salinity.
Growth and quality performances of seaweed (Kappaphycus alvarezii) with different combinations of temperature and light parameters
Authors: Syahrul  , Supriyono E , Nirmala K , Lideman  
Published: August 2023

Abstract
This study aimed to analyze the optimal combination of temperature and light for the growth and quality of Kappaphycus alvarezii seaweed. This study used a factorial completely randomized design (CRD factorial) consisting of 2 factors (temperature and light) with three replications, which included a combination of temperature 28, 31, and 34 °C with light 50 and 100 photons (µmol m−2 s−1). The test object used was a seaweed seed weighing 50 g. The results showed that the S28C100 treatment gave the highest absolute weight growth value (P<0.05). The highest specific growth rate (SGR) was found in the S28C100 and S31C100 treatments, not significantly different between the two, respectively 3.77±0.058% and 3.03±0.12%. Treatment S31C50 followed by S31C100 gave the highest value for the carrageenan yield, but there was no significant difference between the two, respectively 15.505±0.71% and 13.965±0.26%. The combination of temperature and light in this study resulted in gel strength values of 922.150±234.26 to 1048.555±266.46 g.cm−2 but not significantly different between each treatment.
Effect of different forms of Carica papaya leaf processing techniques on growth, body indices and survival rate of red hybrid tilapia, Oreochromis mossambicus × Oreochromis niloticus
Authors: Somdare P O , Hamid N K A , Sul’ain M D 
Published: August 2023

AbstractThe use of natural products as additives in the production of aquaculture feed stimulates appetite, improves growth performance, and strengthens the immune defense mechanism in numerous aquaculture species. This study was conducted to determine the effect of various Carica papaya leaf processing techniques on the growth performance, body indices, and survival of red hybrid tilapia with an initial body weight of 2.371.0 ± 0.036 g. Four isonitrogenous (360.00 gkg−1) and isolipidic (80.00 gkg−1) diets were formulated and fed to red hybrid tilapia in triplicate groups for 12 weeks using a completely randomized experimental design. Papaya leaf inclusion in the formulated diets varied based on processing method: control (0%), commercial papaya leaf extract (1%), oven-dried papaya leaf powder (2%), and freeze-dried papaya leaf extract (2%). Regardless of processing method, the final weight of fish fed a diet containing papaya leaves was significantly greater (P 0.05) than that of the control group. However, there was no significant difference (P > 0.05) in growth performance between papaya leaf processing techniques. Similarly, the weight gain, specific growth rate, and feed conversion ratio did not differ significantly (P > 0.05) between groups supplemented with papaya leaf. In addition, the viscero-somatic index, hepato-somatic index, and survival rates were not affected (P > 0.05) by the different leaf processing techniques. Despite the fact that Carica papaya leaf processing techniques had no effect on the performance of Carica papaya leaves as functional feed additives, oven-drying is recommended due to the lower production cost. Similar to commercially produced and freeze-dried papaya leaf extracts, oven-dried papaya leaves containing 2% inclusion can be used as a dietary feed supplement in aquaculture.
Additional of coconut water and glycerol in sperm storage spermatozoa motility and viability of comet fish, Carassius auratus
Authors: Dewi C D , Izzah N , Mellisa S , Ismarica  , Perdana A W 
Published: August 2023

Abstract
This study aims to determine the effect of giving coconut water and glycerol to comet fish (Carassius auratus) sperm storage on the motility, viability of comet fish (Carassius auratus) sperm and the degree of fertilization of comet fish eggs. This research was carried out at the Fish Hatchery Laboratory, Faculty of Marine and Fisheries, Universitas Syiah Kuala. This research method used was a Complete Randomized Design (CRD) consisting of four treatments with five replications, namely (P0) Sperm + 100% NaCl, (P1) Sperm + 50% coconut water + 50% glycerol, (P2) Sperm + 60% coconut water + 40% glycerol, and (P3) Sperm + 70% coconut water + 30% glycerol. The results showed that adding coconut water and glycerol to Storage of comet fish sperm had a significant effect (<0.05) on the value of motility and viability. Based on the results of the study, it can be concluded that the highest values of post-cryopreservation sperm motility and viability in comet fish in this study were found in the P2 treatment with a concentration of 60% d coconut water + 40% glycerol.
Benthic macroinvertebrates community in relation to environmental variables of the Cimandiri River and Estuary, Indonesia
Authors: Ibrahim A , Sudarso J , Imroatushshoolikhah I , Marwoto R M , Isnaningsih N R , Aisyah S , Triyanto T 
Published: August 2023

Abstract
Benthic macroinvertebrates, the community that lives in the river and coastal, play important role in the transfer of organic materials. This study aimed to determine the diversity of it in Cimandiri river and estuary. Also, to understand the relation between the community with environmental variables. The research was conducted in September and November 2020, which taken from 10 locations at Cimandiri waters. Benthic macroinvertebrates were collected using the Ekman grab sampler with three replications. Moreover, physicochemical parameters of water and sediment were measured. In general, about 35 taxa belonging to six Classes, including Gastropod, Bivalve, Insect, Malacostraca, Clitellata, and Polychaeta have been found during sampling. Furthermore, Stenelmis sp., one of Insects was predominant benthic invertebrates in the river, whereas Tarebia granifera predominated inhabit the estuary. Margalef richness and Shannon-Wiener diversity index in the river area were about 2.69 and 1.47, while in the estuary was around 1.59 and 0.87. Canonical Correspondence Analysis shows that the number of individuals of 25 taxa tended to correlate with water temperature, TDS, salinity, total of nitrate (TN), total of phosphorus (TP), and total of organic matters (TOM). While, 10 other taxa correlated with pH, turbidity, dissolved of oxygen (DO), ammonia, and the total of suspended solids (TSS).
Population dynamics of thresher shark (Alopias pelagicus) landed at the Kutaraja fishing port, Banda Aceh
Authors: Rahmah A , Rusmar R , Salmarika  , Chaliluddin M A , Rianjuanda D 
Published: August 2023

Abstract
At the Kutaraja Fishing Port, the shark species Alopias pelagicus accounts for the vast majority of shark catches. The purpose of this research was to ascertain the length distribution of A. pelagicus, the length at which it was first captured, the sex ratio, the von Bertalanffy growth parameters and functions, the mortality rate, and the exploitation rate. This study was carried out in the Kutaraja Fishing Port from December 2021 to February 2022. The incidental sampling method was used to collect 406 samples in total. The FAO-ICLARM Stock Assessment Tools were utilized to analyze population dynamics parameters. The male, female, and combined length distributions of A. pelagicus ranged from 186-295cmTL, 205-304cmTL, and 186-305cmTL, respectively. The length of the first capture was 249.40 cmTL, 252.29 cmTL and 250.78 cmTL, sex ratio of males and females is 1:2.24, the asymptotic length (L∞) was 344.25 cmTL, fish age at length 0 (t0) was 0.066/year, with a growth rate (k) of 0.50/year, 0.36/year dan 0.19/year, 374.83 cmTL and 378.92 cmTL, 0.058/year dan 0.048/year. Natural mortality (M) was assessed to be 0.59/year, 0.47/year, and 0.31/year, fishing mortality (F) was 2.08/year, 2.47/year, and 2.20/year, and total mortality (Z) was 2.67/year, 2.94/year, and 2.51/year. The A. pelagicus exploitation rate (E) was 0.78/year, 0.84/year, and 0.88/year, demonstrating complete exploitation of the male, female, and combined populations.
Domestication of Javaen Barb (Puntius orphoides) as Indonesian Endemic Fish: Breeding the Aquaculture Commodity Candidate to Increase Seed Productivity
Authors: Iskandar A , Carman O , Zairin M , Suprayudi M A , Winarto A , Effendi I , Sudrajat A O 
Published: August 2023

Abstract
Indonesia has a very high aquatic biodiversity, including local fish scattered in several areas. Currently, these resources are decreasing and even threatened with extinction if not noticing the environmental balance factor. Natural damages to the aquatic environment and increased fishing activity can cause the fish population and diversity to decline, even threatening the extinction of certain types of fish. Puntius ophoides is a commodity that has not yet developed its culture technology, so efforts are needed to investigate its reproductive biological aspects to encourage the culture development and maintain its sustainability level. The purpose of this study was to evaluate the effectiveness of PMSG hormone on the gonadal maturation pattern of this fish. This study used a completely randomized design (CRD) with four treatments and three replications, namely: 0 IU/kg, 5 IU/kg, 10 IU/kg, and 15 IU/kg body weight. The results showed that PMSG treatment at 10-15 IU/kg obtained the best performance compared to other treatments. PMSG hormone treatments could increase the gonadosomatic index (GSI) value by 15% compared to the control treatment. Increased hepatosomatic index (HSI) value was also shown at the end of the study with an average IHS value of 2%. This means that the PMSG hormone affects the vitellogenin production in the liver.
The effect of different spat collectors on attachment and growth of oyster spat (Crassostrea gigas) in Alue Naga
Authors: Rusydi I , Meldayani  , Rahimi S A E , Wulantari  , Aprilia  , Rianjuanda D , Melanie K , Akbar S A 
Published: August 2023

Abstract
Oyster (crassostrea gigas) is one of the potential bivalves that can be developed to increase economic income. One of the stages of how to cultivate oysters is the initial process of sticking oyster spats. This study aims to analyze the success of attachment and growth of oyster spats in each collector and the factors that influence the growth of Pacific oyster spats (crassostrea gigas) in each collector. the method used is the experimental method using a completely randomized design model (RAL) with 3 treatments, each treatment 3 times repetition. The collectors used are plastic fiber, coconut shell, and used tires. The results showed that the average adhesion in treatment a was 13.7% cover attachment, in treatment b had an average percentage of attachment of 6.8%, while in treatment c had a percentage of 10.12%. Pacific oyster spat size growth in treatment a has an average size of 1.1 cm, in treatment b has an average of 0.7 cm, and in treatment c has an average size of 0.8 cm.
Analysis of chlorophyll-a, sea surface temperature, and sea surface salinity in the Bay of Bengal
Authors: Hidayat M N , Wafdan R , Ikhwan M , Ramli M , Rizal S 
Published: August 2023

Abstract
The waters of the Bay of Bengal (BoB) are influenced by the northeast monsoon (November-February) and the southwest monsoon (June-September). This study aims to determine the relationship between sea surface temperature (SST), sea surface salinity (SSS), and chlorophyll-a (Chl-a) during January 2021 in the BoB. The method used in this study is the method of correlation analysis, hypothesis testing, and analysis of variance using monthly average data for January 2021. The data comes from the Copernicus Marine Environment Monitoring Service (CMEMS) portal. Our analysis showed that high Chl-a was inversely related to low SST and SSS conditions and vice versa. This finding confirms the results of other previous studies. Medium and negative correlations occurred for the Chl-a - SST and Chl-a - SSS pairs. Meanwhile, the SST- SSS pair shows a strong and positive correlation. The hypothesis test shows that the conclusions drawn from these correlation relationships are acceptable. Furthermore, from the analysis of variance obtained, it was found that Chl-a had a significant effect on variations in SST and SSS, while SST had a significant effect on variations in SSS.
Halmahera walking shark (Hemiscyllium halmahera) in south Morotai, North Maluku and the importance of marine protected areas for endemic species conservation
Authors: Ichsan M , Bimantara H A , Pridina N , Wardhanie A N 
Published: August 2023

Abstract
In 2013, Allen et al. discovered the Halmahera walking shark (Hemiscyllium halmahera) in North Maluku, Indonesia. The current known distribution of this species is within Halmahera Island and surrounding islands, such as Ternate, Tidore, Bacan, and Morotai. This study discussed the records history of the species on Morotai Island and the risk faced by this species. Where recently, one individual of this species was recorded opportunistically during SCUBA Diving activity in April 2022 in Southern Morotai, one of Indonesia’s most well-known marine tourism sites for shark diving. Understanding the species distribution, habitat, and behaviour within this area is essential for improving conservation and tourism management, especially for endemic shark species with a limited habitat range.
The Variability of Sedimentary Carbon Stock in Seagrass Ecosystem in Central Tapanuli, Indonesia
Authors: Khairunnisa K , Harahap Z A , Farahisah H 
Published: August 2023

Abstract
Blue carbon is a term to underline coastal ecosystem such as mangrove, seagrass, and tidal marshes capability as carbon sequestration where the organic carbon that stored in coastal sediment is greater than the organic carbon in living biomass. This study analysed the variability of sediment carbon stock in seagrass ecosystem in Central Tapanuli, Indonesia. LOI method was used to determine the carbon stock. Regression analysis showed that depth, and dry bulk density strongly influence the sedimen carbon stock in seagrass ecosystem (R2 = 0.77 in Hajoran and R2 = 0.79 in Jago-jago) where the total organic carbon stock in upper layer and denser sediment was higher than the organic carbon stock in middle/bottom layer sediment. Moreover, sediment type also influenced the carbon stock where sediment with finer grain size (11.80 – 13.46 Mg C/ha) captured more organic carbon than sand (6.54 – 10.34 Mg C/ha). By knowing this capacity, monitoring and maintaining coastal sediment and vegetation should become priority to mitigate the climate change.
Diversity, evenness, dominance, and similarity index of river fish in Krueng Teunom water, Aceh Jaya
Authors: Nasir M , Firdus F , Rosfita R , Munira M 
Published: August 2023

Abstract
The objective of the study was to determine the diversity of fish species found in the Teunom River, Aceh Jaya Regency, Aceh Province. The research was conducted from August 2019 until Juli 2020. This research used an Exploration Method. The research station was determined by purposive sampling based on environmental conditions along river flow. Fish samples were collected using fishing rods, traps, and nets. The results of identification indicate there were 431 individual fish that were divided into 11 families and 16 species. Fish species were commonly found from the family of Cyprinidae with six species namely Labtobarbus hosii, Anematichthys apogon, Rasbora sp., Tor tambroides, Osteochilus kappenii, dan Osteochilus vittatus. The five stations’ diversity index (H’) was classified as low to moderate criterion with a value range of 0,80 to 1,86. The dominance index (C) ranged from 0,17 to 0,52. The evenness index (E) ranged from 0,43 to 0,97. While the similarity index of fish species between stations ranged from 0,0% to 0,89%. The physics-chemical condition of Teunom River water was considered to be optimum for the survival of fish.
Sea bamboo growth form (Isis hippuris) on different habitats in the waters of Tanjung Tiram, South Konawe
Authors: Afu L O A , Chamidah A , Yanuhar U , Maftuch  
Published: August 2023

Abstract
The form of growth of sea bamboo (Isis hippurus) in an area depends on the ecological state or natural environment in which the sea bamboo is located. Different growth forms in habitats have different characteristics and levels of response to environmental pressures. This research examines how sea bamboo (Isis hippuris) grows in different habitats in Tanjung Tiram’s waters. The method used in this study is a descriptive survey method. The method used for data retrieval is a belt transect. The study was conducted at two locations (different habitat conditions). The results showed that growth forms are vertical (in coral habitats) and horizontal (in coral-seagrass habitats).
Contamination assessment of a freely expanding green propellant thruster plume
Authors: Buntrock L J , Grabe M , Fischer H 
Published: August 2023

Abstract
A number of propellant/thruster combinations are under development in recent years that aim to replace the prevailing hydrazine-driven reaction control thrusters with less hazardous substances (“green propellants”). With some of these systems already in orbit, characterizing their contamination potential in a space environment becomes relevant. In this paper we discuss experiments on plume induced contamination from a novel propene/nitrous oxide bipropellant thruster, including high-speed imaging, SEM-EDS analysis, QCM measurements and in-situ mass spectrometry. Additional measurements of combustion chamber pressure complement the overall characterization of the thruster performance in a high vacuum environment. The main findings of this exploratory study are strong indications of solid and liquid phase particles being ejected from the nozzle, which will be investigated in a subsequent phase of the activity.
Interaction mechanisms between Atomic Oxygen and materials: investigation on reflected beam
Authors: Leveque D , Duzellier S , Vilaranda Fernandes M , Chanteperdrix G , Nguyen Van Sang D , Perrin-Bailly V , Jouanne P , Laurent E 
Published: August 2023

Abstract
Atomic Oxygen (AO) is the main component of the residual atmosphere present at low earth orbit. Multiple reflections can locally enhance or lower erosion rate in case of complex geometry. The need for precise estimate of hyperthermal AO flux is thus crucial at critical target embedded into realistic assembly. Industrial modeling tools (example Atomox module in ESABASE2 and SYSTEMA toolboxes) may account for multiple reflections with simplistic approach (ray-tracing) and a set of semi-empirical parameters. In this context, an original geometrical setup was designed in order to expose target surfaces with normal and tilted incidences and after one reflection on a set of materials of interest (black conductive thermal coatings, coverglass, surface treatment…). Candidate materials have been selected in view to compare numerical results and experimental ones. Results of two test campaigns highlight the effect of incidence angle on erosion rate (higher erosion with tilted beam) and provide an estimate of residual fluence after one reflection (in the 4-10 % range depending on material type). First computations with engineering codes have been successfully conducted, the erosion patterns being rather well described with some basic hypotheses on material parameters (absorption, specular/diffuse reflection) and taken into account the reflection on adjacent metallic surfaces.
Monopropellant plume-induced contamination testing for the Europa Lander mission concept
Authors: Grabe Martin , Buntrock Leonie J , Soares Carlos E 
Published: August 2023

Abstract
The induced contamination from two hydrazine-propelled thrusters is studied in the high-vacuum plume test facility for chemical thrusters at DLR Göttingen, STG-CT. A number of representative material samples are exposed to the freely expanding pulsed thruster plume for subsequent in-depth analysis at JPL. The plume gas is monitored in-situ with a mass spectrometer and quartz crystal microbalances, while non-gaseous ejecta are recorded with a high-speed camera setup. With the detailed chemical analysis ongoing we report on the measurements obtained during the campaign and immediate post-test observations.
Ariane 5 Fairing Preparations for the James Webb Space Telescope (JWST)
Authors: Stewart E M , Wooldridge E M , Schmeitzky O , Bonhomme J , Madsen M 
Published: August 2023

Abstract
The James Webb Space Telescope (JWST) is a large, infrared space telescope operating at Lagrange point 2. JWST is a joint effort between NASA, ESA, and CSA and was launched from the Centre Spatial Guyanais (CSG) on an Ariane 5 rocket in December 2021. The Ariane 5 payload faring (PLF), interior and Vehicle Equipment Bay membranes received multiple cleanings, detailed inspections, and verification sampling to achieve necessary cleanliness levels.
Investigation of PLF cleanliness began early in the JWST program to test the Fairing Acoustic Protection (FAP) panels. Initial PLF cleaning was performed at RUAG in Switzerland prior to shipment to the launch site in collaboration with NASA and ESA. The cleaning procedure used at RUAG premises was based on heritage of the PLF cleaning procedure for ESA/Herschel-Planck and NASA/Mars2020 missions on an Atlas V launcher. The Ariane 5 fairing was packaged in a clean manner and inspected and cleaned upon arrival to CSG. Silicon wafers and particle fall out (PFO) plates were used to monitor the internal fairing cleanliness prior to encapsulation. Just after encapsulation, PFO plates and calcium fluoride (CaF2) crystals were placed inside the fairing on a specific tool door for monitoring the cleanliness inside the fairing during the ventilation phase. The fairing itself was specially sealed to protect the inner environment with just a small, doored porthole accessible via diving board for final closeout of the purge interface. Fairing cleanliness was achieved and mitigated contamination distribution upon launch.