bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of technique for assessing urban water security in Depok City
Authors: Rachman L M , Rachman R A , Rahmalia N , Ain A Q , Wahjunie E D 
Published: August 2020

Abstract
Rapid urbanization, population growth and economic drivers forced megacities, metropolises, and many cities around the world face increasing challenges to manage water security in urban areas. The urban water security (UWS) issues becomes more attracting attention of various parties, especially those involved in planning of supply and allocation of urban water, implementation and operation of urban water management all together with systems and techniques for assessing UWS along with the indicators used. This study aimed to: 1) review the assessment system of accomplishment to meet the needs of clean water in the Depok City by PDAM Tirta Asasta Depok (PDAM TAD) and then comparing with the standard of UWS assessment used by the world’s leading cities, 2) develop and propose technique, criteria and indicators for assessing UWS of Depok City. Performance assessment of PDAM TAD in 2018 for serving drinking water in Depok City by using BPPSPAM Guidelines showed that PDAM TAD is classified as “well company”. However, a new technique together with indicators to assess UWS of Depok City is still needed to develop and propose since BPPSPAM Guideline has not fully covered and resembled the criteria and indicators used to measure UWS used widely by the world’s leading cities.
Diurnal variation of the water quality parameters in the waste stabilization ponds (WSPs) for water treatment of integrated multi-trophic aquaculture (IMTA) ponds with closed re-circulation system
Authors: Ajie G A , Setiadewi N 
Published: August 2020

Abstract
Organic wastes from Floating Fish Cage Aquaculture (FCA) activities have polluted many inland water bodies, from small reservoirs to major lakes in Indonesia. It has become a national priority to restore ecosystem health in Lake Maninjau. The lake has suffered from the harmful effects of approximately 17,000 units of FCA on its surface area. Better FCA practices that would improve its adjacent water quality have been proposed. The FCA should utilize a more excellent net that would confine its waste. Using a connection pump, the wastewater within this net could then be circulated into a wetland system for its water quality improvement. The proposed wetland system consists of a series of Waste Stabilization Ponds (WSP) and Constructed Wetland Compartments. For the initial stage, a study has been conducted to test the performance of the WSP with approximately six days of hydraulic retention time (HRT) to improve water quality from the Integrated Multi-Trophic Aquaculture (IMTA) ponds in the Prototype Laboratory of Research Centre for Limnology-LIPI. Two major problems in IMTA, namely organic deposition and low of dissolved oxygen (DO), especially concerning its diurnal variations in the system, have not been studied yet. Water qualities of the WSP ponds were measured every 2 hours for three days (22-25 May 2019). Water quality parameters measured were pH, conductivity, dissolved oxygen (DO), turbidity, temperature, oxidation and reduction potential (ORP), and total dissolved solids (TDS). A closed re-circulation within the WSP system was then applied for the last two days of the study period. The result showed that DO values in the effluent pond during the day were significantly higher than the night. In the maturation and facultative ponds, DO values difference ranged from 2.5-3 mg/L and 1.1-4.4 mg/L, respectively. The highest DO (5.98 mg/L) was measured in the maturation pond at 3.00 PM and values were lowest almost to 0 mg/L during the first day in the anaerobic ponds. While for turbidity, the highest was observed in the anaerobic ponds for 41 NTU and were decreased to stable values of an average of 5.3 NTU in the maturation pond on the third day. At the end of the observation, marked increase of DO and decrease in turbidity have occurred in the system. A closed recirculation system within WSP can be used as an option to increase the performance of the wetland system.
Antibacterial activity of Anadendrum microstachyum and Selaginella plana against two pathogenic bacteria (Edwardsiella ictaluri and Streptococcus agalactiae) causing freshwater fish diseases
Authors: Novita H , Novitaningrum A D , Madusari B D , Nugraha M F I , Rajamuddin M A , Yunita R , Enggarini W , Reflinur  
Published: August 2020

Abstract
Aquatic plants are potential to use as antibacterial to control pathogens that cause disease in fish. The antibacterial activity of extracts of Anadendrum microstachyum and Selaginella plana were tested against Edwardsiella ictaluri and Streptococcus agalactiae using disc diffusion Kirby-Bauer method. Plant extracts of A. microstachyum and S. plana at concentration 0.2 g could inhibit E. ictaluri and S. agalactiae; therefore A. microstachyum and S. plana are potential be developed as antibacterial compounds to substitute the use of antibiotic in fish farming and as candidates new drug to prevent and control of diseases in aquaculture.
Endemic and invasive species of Lake Matano and allowable suspended solid load to sustain high species endemism
Authors: Sulastri  , Harsono E , Ridwansyah I , Dina R , Melati I 
Published: August 2020

Abstract
Lake Matano, an ancient tectonic, is characterized by its high degree of aquatic fauna endemism and richness dwelling the littoral bed. Two main issues threatening the sustainability of those species are 1) high rate of land conversion and 2) the occurrence of invasive fish species. Through this study, we unveiled how sediment load from converted lands may have influenced the habitat of the endemic species. Based on our hydrodynamic simulation, suspended solid loads from the incoming streams have been accumulating in certain littoral areas of the lake, which is the preferable habitat for most endemic species. We computed that the maximum suspended solid loads from those inlets is 25 kg/day in order to minimize the impact of sedimentation in littoral zones. An in-depth analysis of species interaction in the littoral zone was also performed to depict probable threats to endemic fauna dwelling littoral areas of the lake.
Nitrogen uptake competition between minute duckweed (LemnaperpusillaTorr) and microalgae under various nutrient composition
Authors: Satya A , Satya I A , Chrismadha T 
Published: August 2020

Abstract
Implementation of minute duckweed (Lemnaperpusilla) in an integrated aquaculture system for encouraging movement of in-lake floating cage aquaculture to inland base aquaculture has been emphasized as one among various measures for restoring the degraded Lake Maninjau water quality. Unfortunately, in the field, there is a harmful competition between microalgae and duckweed for nutrient uptake. This paper reports an attempt to find out suitable nutrient solution composition for supporting duckweed growth while suppressing the microalgal proliferations. Batch culture of the plant with six varied media treatments (A to L) whichmade from Nitrogen-Phosphorus-Potassium (NPK) fertilizers basis enriched with trace elements, bio-algaecide (Terminalia Cattapa extract), and molasses solutions were examined. The adsorption of TN by duckweed and the assemblage of natural microalgae community was quantified and modelled using mass balance concept approach and non-linear equations. The result showed that among of 12 obtained models, treatment E (a solution which made from NPK fertilizer enriched with molasses and trace element) was the most favourable media composition for promoting duckweed growth and simultaneously suppressed microalgae growth. It is proven from the fact that the TN uptake patterns and the chlorophyll-a content which show chlorophyll-a content werethree magnitudes higher than those were found in treatment A (the most optimum medium for growing microalgae community). The TN uptake rate by minute duckweedin treatment of E was observed as much as 251.54 mg/m2/day while that ofmicroalgae was 208.60 mg/m2/day.
Cadmium distribution in water, microalgae biomass, and sediment of River Bonan Dolok, Samosir-North Sumatra, Indonesia
Authors: Satya A , Sulawesty F , Yustiawati  , Widiyanto T 
Published: August 2020

Abstract
River Bonan Dolok in Samosir is located on the watershed of Lake Toba, an ancient volcanic lake in North Sumatra. Some parts of this river bordered with paddy fields, a common source of cadmium through the leaching process, which then released into the water body. Meanwhile, this river has been proposed as endemic fish (called in the local name as Ihan) conservation area and eco-tourism area. Therefore a scientific reference base management concept is needed. Spatial distribution of cadmium (Cd) must be revealed since this metal is very toxic and can be easily transferred and accumulated in the aquatic food chain. This study aims to inform the distribution of Cd in water, microalgae biomass and sediment. All samples were taken compositely from the upper stream (Station 1), Station 2, Station 3, and lower stream (Station 4) in April 2019. The structure of microalgae community is also identified. The results show that Chlorophyte (mostly consisted of Microspora sp) biomass at Station 2, has the highest Cd concentration (0.57 µgCd/g dry weight). While Cyanophyte (dominated by Microcyctis aeruginosa) even observed bloomed at station 4, shows a lower Cd concentration (0.12µgCd/g dry weight). The distribution of Cd in water and sediment (particle size of ≤63 µm) at those sampling stations as well as some water quality also discussed. The range of Cd concentration in water was 0.02 to 0.64 µg Cd/L, while that in sediment was 0.10 to 0.39 µgCd/g dry weight. These data are expected to be used as essential references for developing the management concept of Bonan Dolok ecotourism area in the future.
Organic matter and organic carbon levels in sediments of Lake Maninjau, West Sumatra
Authors: Dianto A , Ridwansyah I , Subehi L 
Published: August 2020

Abstract
The organic matter content of lake sediments provides a variety of indicators, or proxies that can be used to reconstruct paleoenvironments of lakes and their watersheds. Particularly, in this study it will provide information that is important to interpretations of both natural and human-induced changes in lake ecosystems. The abundance of organic matter in sediments is described from the total organic carbon (TOC) because it’s a primary parameter. Moreover, Algae is the main source of organic carbon in the eutrophic lake. Lake Maninjau that located in West Sumatra has been eutrophic due to increasing of lake water utilization for floating fish cages, in recent years Lake Maninjau has faced an algal bloom frequently. Four sediments core were collected in Lake Maninjau from the lowest (near coastal) and deepest part (30 cm long core in average). Total organic matter (TOM) was performed using Lost on Ignition method (LoI) in whole cores, while total organic carbon (TOC) was analyzed using combustion analyzer method in one core that was taken in the deepest part of Lake Maninjau. TOM in Lake Maninjau among the cores varied between 21 to 34% at the surface, then decreased slowly as a depth. The percentage of surface TOM in the near coastal is elevated to the deepest part (21% to 34%). The TOC content in the surface was 9%. According to the Mid-Atlantic Integrated Assessment (MAIA) Estuaries the TOC concentrations in the sediments was in the range of high organic carbon level (>3%). The high value of TOC level in the surface sediment was controlled by algal productivity.
Realizing the Dead Sea Lakes Region in Rote Islands to be a geopark using multidisciplinary spatial information approach
Authors: Julzarika A , Laksono D P , Kayat  , Subehi L , Dewi E K , Sofiyuddin H A , Nugraha M F I , Anggraini N , Setianto A , Janwes  , Yudhatama D 
Published: August 2020

Abstract
Rote Ndao Regency is the southernmost region of Indonesia bordering Australia and Timor Leste. This regency has varieties of unique and endemic geology, biodiversity and inland waters. The regency has some 80 lakes where around 20 are saltwater lakes. The salinity of these lakes exceeds the salinity of seawater. The majority of these saltwater lakes are located in the Dead Sea Lake Region of Rote islands. Geologically, the islands have mixed deformations that move vertically and horizontally and are lifted partially from the Australian continent. The biodiversity in this region is also unique as there is a Roti snake-necked turtle that enters endangered animals. There are also unique mangroves conditions that live far from water sources due to vertical deformation. Rote Ndao also has areas of peat coal that are mixed with saltwater areas, freshwater areas, and brackish water areas. Remote sensing can be used to help effectively and efficiently in geological, biodiversity and inland waters mapping. This study aims to inform the related spatial information of the frontier region of Rote Ndao with the use of multidisciplinary remote sensing to realize Geopark. This multidisciplinary approach in remote sensing applications is used to obtain spatial information based on geo-biophysical and classification parameters. Data used in the form of ~ 65-70% remote sensing data and ~30-35% non-remote sensing data. Remote sensing data in the form of Landsat, Sentinel, WorldView-2, Planet, Grace, Goce, Champ, and others. This multidisciplinary approach includes remote sensing, geodesy, geology, limnology, biodiversity, water resources, forest conservation, and geo-informatics. The uniqueness of geology and biodiversity in the Dead Sea Lake Region of Rote is expected to make this region become a Geopark.
Utilization of DSM and DTM for Spatial Information in Lake Border
Authors: Julzarika A , Harintaka  
Published: August 2020

AbstractLake is one part of inland waters and plays an important role in human life and the surrounding environment. Lakes need to be preserved, especially in the lake area and its border. One way to preserve the lake is to map the potential of spatial information in the lake and its surroundings. Digital Terrain Model (DTM) and Digital Surface Model (DSM) can be used to obtain spatial information in the lake border. DTM and DSM can be extracted from terrestrial and non-terrestrial mapping such as remote sensing satellites. The study area in this study is Lake Oeduli on Rote Island. This study aims to inform the potential utilization of DSM and DTM for the spatial border of lakes. The potential is in the form of determining the lakeside line, lake border area, and vegetation height. All of these potentials can be extracted from DSM and DTM. This DSM and DTM can also be dynamic and non-dynamic. The results of this study can be utilized as a method for spatial information extraction of lake borders in support of national inland waters.
Water balance of Maninjau watershed with SWAT hydrological model
Authors: Ridwansyah I , Rustini H A , Yulianti M , Apip  , Harsono E 
Published: August 2020

Abstract
Lake Maninjau was one of the international tourist destinations before the 2000s. Aside from being used as a source of 66 MW hydroelectric power built in 1972, currently, this caldera lake is also used for aquaculture. Lake Maninjau ecosystem, which consists of water bodies and watersheds, has an area of 23,729.3 Ha. The surface area of Lake Maninjau at +461.5 m asl is 9,737.5 Ha. Calculation of water balance in the Lake Maninjau watershed becomes a necessity because of its multi-functional status. Maninjau watershed water balance is estimated using SWAT (Soil and Water Assessment Tools) model. Rainfall data from Climate Hazard Group InfraRed Precipitation with Station (CHIRPS) was reanalyzed and compared with local rainfall data. The simulation conducted for 1981 - 2019 on the sub-watershed scale produced NSE and R2 values of 0.61 and 0.7, respectively. The simulation was scaled up for the entire catchment of Lake Maninjau. Simulation results showed that an average annual rainfall of 2,483.9 mm/year produced a surface flow, interflow, base flow, and recharge to aquifer of 7.8 mm/year, 1397.4 mm/year, 273.4 mm/year and 14.7 mm/year, respectively.
Diversity of fish caught using gill nets in Lake Sentarum, West Kalimantan – Indonesia
Authors: Haryani G S , Hidayat  , Samir O 
Published: August 2020

Abstract
Lake Sentarum National Park (LSNP) is a Ramsar site located in the Upper Kapuas Regency, Province of West Kalimantan, Indonesia. This national park is an unique freshwater fish habitat formed by flat basin or floodplain with fluctuated water level throughout the year in response to rainfall and supply of water from the Kapuas River system. This study aims at describing the fish diversity variation in the LSNP caught using gill nets during high water period (rainy season) in March, June, October 2013, and June 2014 and during low water period (dry season) in March 2014. Samples were taken in three locations, i.e. River Tawang (outlet), Lake Pengembung, and Lake Belida. Six orders, 15 families, and 39 fish species were found. The total number of species found during the low water depth period was less (20 species) than that during high water depth period (32 species). ‘Flood-pulse’ cycle and the corresponding rise and drop of water level in the floodplain area, sustained by aquatic productivity and habitat diversity, are considered to be the responsible hydrologically controlled seasonal variation in the study area.
Diversity and length-weight relationships of fishes from Lake Cala in tide season
Authors: Sawestri S , Herlan  
Published: August 2020

Abstract
Lake Cala, a fishery potential oxbow lake, is located in Musi Banyuasin, South Sumatra. Lake Cala is a wetland that flooded during high tide and become land in dry season. The study was conducted to determine present status of the diversity and the condition of fish. This study has been done at Lake Cala in February until March 2017. On this tide season, data were collected by fishers. The fish sampling was conducted using hook line, cast nets, gillnets and fish traps (corong). A total of 27 fish species belongs to three ordo,11 families, and 19 genera were recorded during the study. Diversity of fish in Lake Cala on the tide season is dominated by whitefishes. Based on its potency, most fish species are 59% consumption, 33% double potency, and 8% ornamental fish. Aro (Osteochilus melanopleura) and palau (O. vittatus) from Cyprinidae family, and baung (Mystus nemerus) from Bagridae family were dominant. The length-weight relationship showed that dominant two species of fish (baung and palau) had positive allometric growth patterns, while aro is isometric. Those parameters obtained from the study are useful fundamental information applicable in the future population dynamics studies. Furthermore, based on these result it was necessary to manage the fishing gears operation and regulating tributaries to maintain the process of fish on search for feed, distribution, and colonization of various species and populations.
Gillnets selectivity and effectivity for controlling invasive fish species in Lake Matano, South Sulawesi
Authors: Sentosa A A , Hedianto D A 
Published: August 2020

Abstract
Lake Matano is one of the ancient lakes in East Luwu Regency, South Sulawesi, which has uniqueness and high endemicity for freshwater fishes. The presence of invasive alien fishes there can threaten the existence of endemic fishes. This study aimed to investigate the selectivity and effectiveness of the use of gillnets on several mesh sizes for controlling the population of invasive alien fishes in Lake Matano, South Sulawesi. Sampling was conducted in May, October, November 2015 and February, July, November 2016 using monofilament experimental gillnets with various mesh sizes (0.75, 1.0, 1.5, 2.0, 2.5, 3.0 inches) and yarn thickness (D = 0.15, 0.20, 0.25 mm). The mesh size of 1.5, 2.0, and 2.5 inches could catch flowerhorn cichlid as the dominant and invasive alien fish with little chance to catch native fishes in Lake Matano. The selectivity factor (SF) for the mesh size of 1.5, 2.0, and 2.5 inches was 3.02. The average catch size of flowerhorn cichlid captured by the mesh size of 1.5. 2.0, and 2.5 inches were 11.5, 15.3, and 19.2 cm, respectively. The yarn diameter did not significantly affect flowerhorn cichlid capture (P <0.05). However, the mesh size of 1.5 inches was significantly different (P>0.05) to other mesh sizes. For effectiveness, gillnet was better to operate in littoral areas of lakes, especially in the location associated with the sand substrate with macrophytes. The operation of the gillnet in Lake Matano needs to be regulated in terms of location and setting time to minimize the capture of fish species other than flowerhorn cichlid.
Conservation efforts of ikan Batak (Tor spp. and Neolissochilus spp.) and its prospects to support ecotourism in Samosir Regency, North Sumatra Indonesia
Authors: Larashati S , Sulastri  , Ridwansyah I , Afandi A Y , Novianti R 
Published: August 2020

Abstract
Ikan Batak or ihan refers to fishes of genera Tor and Neolissochilus. They are socioeconomically valuable fishes in North Sumatra and some regions in Indonesia, yet their population in the wild has been declined. In situ conservation is one of the efforts to increase its population in natural habitat. Our previous study proposed Bonan Dolok River in Samosir Regency as the potential site for Ikan Batak in situ conservation. The combination of scenic landscapes and a waterfall in the upstream part of the river, as well as the presence of Ikan Batak in the conservation site, can be a potential ecotourism attraction in Samosir Regency. Ecotourism has many advantages, such as providing financial benefits to local people while sustaining natural resources. Our present study aimed to explore the potentiality of Bonan Dolok River for the conservation site of Ikan Batak and its prospect for ecotourism. The bioecological of ikan Batak and hydromorphological description of Bonan Dolok River was based on the literature review and a primary study conducted in 2019. People’s perception of the prospect and challenges of developing ecotourism and stakeholder’s role in the management of conservation and ecotourism were identified. The ecological and hydromorphological profile showed the potentiality of Bonan Dolok for conservation site. The local community of Bonan Dolok plays an essential role related to their local customary in environmental management and initiation of ecotourism. Stakeholders’ awareness on conservation of Indonesian native fishes, including Ikan Batak should be enhanced to get a better understanding of conservation management.
Fishes of Thale Noi and its tributaries, South Thailand
Authors: Lheknim V 
Published: August 2020

Abstract
Thale Noi is a small freshwater lake in the Songkhla Lagoon system in south Thailand. Songkhla Lake basin has been developed under the Thailand National Socio-Economic Plan with well-documented recent changes in its physical environment. The objective of this report is to update the current fish species that inhabit the Thale Noi. This report refers to native species only. Fish diversity was assessed along with the environmental alteration. The present study recorded 51 and 49 native species in 1982–1983, and 2005–2009 respectively, with a total of 54 species belonging to 26 families had been listed. The findings of this study could also be of great value as a starting point for further studies. Regular monitoring for species composition of Thale Noi is needed, and it is essential that the current data and all points of view be considered by decision makers.