Aceh Waters Research Articles

Gap filling of missing satellite data from MODIS and CMEMS for chlorophyll-a in the waters of Aceh, Indonesia

The motivation behind our study is to identify a robust method to enhance the accuracy of missing data, particularly chlorophyll-a data, which often goes undetected due to various factors. This study analyzes chlorophyll-a concentrations and sea level changes due to tides using three methods: Linear Interpolation, Fillgaps, and Modified Fillgaps. Two experiments were conducted: Experiment I involved random data removal (60% and 70%), and Experiment II combined sequential and random data removal (25% sequentially on the right, 35% and 45% randomly on the left). In Experiment I, the Modified Fillgaps method showed high correlation coefficients (up to 0.96) between original and reconstructed data, demonstrating its effectiveness in accurately filling significant data gaps. This method also exhibited low Root Mean Square Error and Mean Absolute Error values, confirming its predictive precision. In Experiment II, despite structured and realistic data loss patterns, the method maintained high correlation and low prediction errors, with low Normalized Root Mean Squared Error and Mean Absolute Percentage Error values, further validating its reliability. Additionally, the method excelled in two-dimensional chlorophyll-a maps, outperforming Linear Interpolation and Fillgaps methods in scenarios with 50% and 60% data loss, achieving higher correlation and lower prediction errors. These findings are crucial for environmental and climatological studies relying on satellite-derived data, confirming the Modified Fillgaps method as the most reliable and effective for handling significant data loss in chlorophyll-a map analyses. Future research should explore its application to other environmental data types and more complex data loss patterns.

Morphometric variations and length-weight relationships of chue snail Faunus ater (Linnaeus, 1758) in the southwest coast estuary of Aceh, Indonesia

Abstract Chue snail, Faunus ater is commonly found on the south-west coast of Aceh. This snail is consumed by the Aceh people and is an important ingredient in the traditional food of the Acehnese. Presently, there is limited information related to chue snails in Aceh waters, including morphological variations and length-weight relationships. These details are crucial for better management planning for this species. Therefore, this research aims to analyze the morphological variations and length-weight relationships of F. ater on the southwest coast of Aceh, Indonesia. Sampling was carried out from July to August 2023 in six estuaries as the presentative of six popula tions covered six districts, namely: Jantang Aceh Besar, Kuala Teunom Aceh Jaya, Kuala Ujong Kalak Aceh Barat, Kuala Trang Nagan Raya, Kuala Lama Tuha Aceh Barat Daya, and Jembatan Kembar Aceh Singkil. A total of 60 samples from each location were used for morphometric analysis using traditional morphometric approaches and the Linear Allometric Model (LAM) for growth patterns. The results showed that the F. ater popula tion was divided into three groups based on the scatter plot, where one group consisted of four populations, namely Jantang (Aceh Besar), Teunom (Aceh Jaya), Ujong Kalak (West Aceh), Kuala Trang (Nagan Raya) and the other two groups were represented by one popula tion or location. The growth pattern of F. ater on the south-west coast of Aceh is classified as negative allometric, the rela tive weight condition factor tends to 100, and the Fulton condition factor is in the range of 1.35-3.33.

Current dynamics to detect the spread of oil spills in coastal waters

Abstract Surface flow dynamics modelling is an important aspect of monitoring and detecting oil spills in marine environments, especially coastal waters. The model can predict the spatiotemporal distribution of oil spills in waters before remote sensing technologies such as radar and synthetic aperture radar (SAR) detect the oil spill distribution range. The purpose of this study is to model two-dimensional (2D) surface flow to predict the extent of oil spills, especially in shallow water or coastal areas. The accuracy of this ocean current distribution model was then verified using the case of an oil spill in East Aceh waters based on the results of the detection of synthetic aperture Interference images from the Sentinel-2B satellite Radar (InSAR) Technology from August 1st to September 20th, 2021. The results show that when the fluid dynamics used is residual flow, the oil distribution trajectory moves partly to the north and partly to the south toward the coast of the leak location. However, when mean current is applied, the distribution expands to the south toward the coast. Based on the state of the wind distribution when the oil spill occurred, it shows the same direction as the residual current model, but the influence of the wind is greater than the residual current. So, it can be concluded that oil spills in the waters of East Aceh are more influenced by a combination of mean currents and surface wind direction. These results were validated by the results obtained from satellite images. Therefore, the satellite image validation results indicate that mean flow provide a more accurate indication of oil spill distribution than the average flow in South Aceh waters.

Politics of Non-Traditional Security: The Weakness of the Maritime Security and Its impact on the Recurrence of Illegal Fishing in the Waters of Aceh

This article examines non-traditional security politics with an emphasis on illegal fishing that can harm international relations, the environment, and human security. This article investigates why illicit fishing by foreign and Indonesian fishing vessels is prevalent in Aceh Province. Illegal fishing cases in Aceh were investigated utilizing Mahan's Sea Power Theory. The research approach employed is qualitative, with data gathered through in-depth interviews and a literature review. The study's findings include incidents of illicit fishing caused by regional, community, and government variables. Aceh's distance from the central government, location on the border, and abundance of marine resources are also regional factors. Aspects of the community include the tiny number of fishermen, the custom of preventing going to sea, and the continued use of prohibited fishing gear. Finally, the government aspects which include a lack of control and legislation encourage illicit fishing in Aceh.

Intensity and prevalence of ectoparasites in whiteleg shrimp Litopenaeus vannamei and mud crab Scylla serrata harvested from Aceh waters Indonesia

Ectoparasite infections are a common problem in small-scale aquaculture, exerting a substantial influence on fishery production. In the context of Indonesia, the two prevalent fishery commodities are whiteleg shrimp Litopenaeus vannameii and mud crab Scylla serrata. These species are extensively cultured within Aceh province, using traditional and semi-intensive aquaculture ponds and there are no reports on ectoparasites in these two species of crustaceans. Therefore, this study aimed to analyze the intensity and prevalence of ectoparasites in mud crab and whiteleg shrimp from Aceh between August to December 2022. Mud crab samples were collected from three locations, namely Langsa City, East Aceh, and North Aceh districts, while whiteleg shrimp samples were sampled from coastal ponds in Banda Aceh, Aceh Besar, and Aceh Jaya districts. The samples were collected over five months, and a total of 300 for each species were examined microscopically by scraping the swimming legs body, and gills. Furthermore, macroscopic-sized and microscopic-sized ectoparasites were observed using stereo and binocular microscopes, respectively. The results showed that five species of ectoparasites were recorded during the study, namely Octolasmis sp., Vorticella sp., Epistylis sp., Oodinium sp., and Zoothamnium sp. Mud crab exhibited infestations of Octolasmis sp., Vorticella sp., Epistylis sp., and Oodinium sp., while whiteleg shrimp were infested by Vorticella sp., Epistylis sp., and Oodinium sp. In this study, the highest intensity for crab and shrimp was recorded in Octolasmis sp. and Epistylis sp., in November and September, respectively. The gills showed higher intensity compared to other infested organs and based on sample origin, crab and shrimp from Langsa and Banda Aceh Cities had higher results compared to other locations. The prevalence of ectoparasites exhibited a high value, reaching 100%, showing that crustacean samples were infested by ectoparasites. Therefore, the intensity of ectoparasite was varied according to sample of origin, time of sampling and infested organs. The samples of both crab and whiteleg shrimp from all locations consistently exhibited ectoparasite infestations throughout the entire study period.Keywords:Octolasmis sp.Vorticella sp.Epistylis sp.Oodinium sp.Zoothamnium sp.

Exploring the interplay of chlorophyll-a, sea surface temperature, and sea surface salinity in aceh waters during january and july 2022

This study investigates the relationship among chlorophyll-a (Chl-a), sea surface temperature (SST), and sea surface salinity (SSS) in Aceh Waters, Indonesia using data from January and July 2022. Chl-a, SST, and SSS data were retrieved from the Copernicus Marine Environment Monitoring Service (CMEMS) database. Pearson correlation analysis was employed to assess the connections among Chl-a, SST, and SSS within the Aceh Waters region. The findings reveal that all three parameters - Chl-a, SST, and SSS - conform to the seasonal monsoon patterns observed in January and July 2022. The correlation analysis conducted for January revealed the following relationships: a negative correlation between Chl-a and SST (-0.649), an inverse correlation between Chl-a and SSS (-0.215), and a positive correlation between SST and SSS (0.493). Conversely, correlations for July reveal a negative correlation between Chl-a and SST (-0.503), a positive correlation between Chl-a and SSS (0.039), and a negative correlation between SST and SSS (-0.478). Overall, this study elucidates the complex relationship among Chl-a, SST, and SSS in Aceh Waters, which is influenced by seasonal monsoon variations. Understanding this relationship is essential for assessing marine environmental dynamics and their potential impacts on ecosystems and human activities in the region.

Characterization of Six Lobster Species of Genus Panulirus (Decapoda, Palinuridae) from Aceh Waters, Indonesia Based on Morphometric Analysis

Characterization of Six Lobster Species of Genus Panulirus (Decapoda, Palinuridae) from Aceh Waters, Indonesia Based on Morphometric Analysis

Coffee Grounds and Coconut Husk in Layered Filter Treatment for Efficiency Removal and Degradation Capacity of Pollution Parameters in North Aceh Waters

Coffee Grounds and Coconut Husk in Layered Filter Treatment for Efficiency Removal and Degradation Capacity of Pollution Parameters in North Aceh Waters

Genetic stock structure of the silky shark Carcharhinus falciformis in the Indo-Pacific Ocean.

The silky shark, Carcharhinus falciformis, is a cosmopolitan species commonly caught as a bycatch for longline fisheries. However, the genetic stock structure for the Indo-Pacific Ocean is not well-defined yet. Here, we used eight microsatellite loci to examine the genetic stock structure and effective population size of 307 silky sharks across 5 Indo-Pacific sampling locations. A major genetic break was found between Aceh and the remaining locations (FST = 0.0505-0.0828, p = 0.001). The Indian Ocean displayed a slightly lower effective population estimate (Ne) compared to the Pacific Ocean, potentially due to the higher fishing pressure in the Indian Ocean region. The lowest Ne was found in the Aceh population (Ne = 2.3), suggesting it might be a small and endemic population. These findings offer valuable information for the conservation and management of the silky shark. We suggest that the population around Aceh waters constitutes a distinct stock and should be managed independently. Further investigations into migratory and movement patterns are needed to define the boundaries of different stocks, ensuring effective management the silky shark across the Indo-Pacific region.

The comparative study on the osteocranium of red snappers Lutjanus malabaricus (Schneider, 1801) and Lutjanus timorensis (Quoy & Gaimard, 1824) harvested from Pulo Aceh Waters, Indonesia

Red snapper fish is one of the most economically important marine fish groups in the world with high morphological similarities. Currently, the taxonomy of snappers relies on external morphological characteristics and genetics (DNA barcoding). Relying solely on morphology for taxonomy might lead to invalid results, whereas the genetic approach is known to be costly and time-consuming. Therefore, this study aims to examine the difference in the head bone (Osteocranium) osteology of two red snappers species namely Lutjanus malabaricus and L. timorensis, harvested from Aceh waters, Indonesia using an alternative approach based on osteological characteristics. A total of five fish samples of each species were collected from fishermen operating in the northern waters of Aceh and were landed at the Lampulo Fish Port, Banda Aceh City, Indonesia. Osteology samples were prepared through six steps, including exterior muscle elimination, immersion in 70% alcohol solution, drying, photographing bones, image editing, and identification of terminology. The results showed that the cranial of Lutjanus is supported by 25 bones, where 13 bones showed differences among the two species of red snappers, namely the nasal, preethmoidal, ethmoidal lateralis, prefrontal, foramen frontal, pterotic, lacrimal, crista occipital, interopercular, opercular, palatinum, preopercular, and premaxilla bones. Among these, a significant difference was found in the angle of the crista occipital bone, where L. timorensis was higher than L. malabaricus. Therefore, it was concluded that the crista occipital bone was a key characteristic to distinguish between the two species of red snappers examined. This study showed that the osteocranium approach can be employed to validate the taxonomic status of these species.

Panglima Laot dan Kontribusinya dalam Penegakan Hukum Adat di Perairan Aceh

Panglima Laot has been felt in Aceh since the era of Sultan Iskandar Muda and is still known today. Panglima Laot is not part of the Aceh government but is recognized as Aceh's cultural heritage. Later, Panglima Laot was also regulated in the Aceh Qanun as the living law in Aceh. Culturally, it can be said that the Marine Commander is the leader of the fishermen in Aceh, whose job is to coordinate the fishermen, maintain maritime security according to their respective territories, and conserve Aceh's marine environment. This article examines the existence of Panglima Laot in Aceh in this contemporary era. With an emphasis on their role in upholding customary law in Aceh waters. The data was obtained through field research in Aceh and library data studies. The findings from this study are that Panglima Laot in Aceh still exists and plays a significant role in upholding customary law in Aceh waters. Coexist in harmony with national law and other legal systems that live in Aceh.

Law Enforcement in Plastic Waste Management in Aceh Waters: Transboundary Marine Pollution Concern

The threat of climate change, which is categorized as an environmental issue, is no longer a problem for one or two countries but has become a worldwide issue affecting nearly all nations. Plastic bags are one of the leading drivers of climate change since, from production through disposal and management, plastic garbage emits a lot of greenhouse gases into the atmosphere. Aceh is a province bordered by the Malacca Strait and the Indian Ocean, both of which are international seas and border other nations. These two bodies of water are the entry and exit points for plastic debris from Aceh’s mainland and elsewhere. This is empirical legal research, a combination of library research on several related legal documents and interviewing some informants and respondents. It found that there is no specific regulation in Aceh as a province that is concerned about Marine debris as it’s not included as a priority for the government of Aceh. It has a significant impact on the ineffectiveness of plastic waste law enforcement in Aceh.

Growth patterns and reproductive aspect of Naleh (Barbonymus sp.) in Krueng Lanca, Nagan Raya Regency, Aceh Province

Naleh (Barbonymus sp.) is one species of native fish found in Aceh Waters. This study examines the growth patterns and reproductive aspects of the fish in Krueng Lanca of Nagan Raya, Aceh Province. The study lasted five months (January - May 2022). Sampling was carried out purposively, once a month, on five different stations using gill nets (mesh size: 0.5 inches, 1.0 inches, and 1.5 inches and cast nets (D: 6 meters, mesh size: 0.5 inches). A total of 171 Naleh was caught in these waters. The calculation results obtained a length-weight relationship W = 0,0003*L2.2234 (r2 = 0.8823) for males, which shows the nature of allometric and W = 6E-06*L3.0684 (r2 = 0.8566) for females which shows the isometric. The sex ratio of Naleh in these waters was 1.1: 1. The size of the first mature gonads was 60-69 mm (males) and 90-99 mm (females) with a Gonadosomatic Index of 1.92-3.04 % (Males) and 8.73-11.61 % (females). The peak of the Naleh spawning season in Krueng Lanca waters was thought to occur from March to April, with the number of eggs ranging from 1,853-3,813 and a diameter of 1.18-1.43 mm. Based on the oocyte distribution, the peak of spawning of the fish was categorized as multiple spawners.

Identification of marine debris from fishery activities in Nipah and Alue Riyeung beaches, Nasi island, Northern Aceh waters

It is believed that the debris discovered in the ocean originated on land and was unintentionally and purposely transported by a river. Marine debris will accumulate on the water’s surface and sink to the bottom over time, polluting the seawater if left mismanaged. The life of marine organism will be threatened by the existence of the debris. The purpose of this study is to quantify the quantity of macro-sized marine debris generated by fishing activities. This study was carried out on Nasi Island in Aceh Besar from February to April 2022. Sampling of marine debris was carried out using the shoreline method with a 100 meter long transect. Marine debris from fishing activities identified includes types of plastic, plastic foam, cloth and wood, with a total of 179 items.

Economic loss as the impact of climate change on tuna fishermen in Northern Indonesian waters

This study aims to determine how big the impact of climate change is on the economic loss of the catch of Tuna fishermen in the northern waters of Aceh Province, Indonesia. Unfavorable climate change has an impact on decreasing fishing catches due to changes in seawater biophysics such as increasing sea surface temperatures, increasing wave height, and wind. The respondents in this study were 40 Tuna fishermen, located in 6 (six) villages in the waters of North Aceh., from two different WPPs, namely WPP 571 and 572. Data were collected by interview and using questionnaires. The results of this study indicate that there is a decrease in the level of welfare of coastal communities which is marked by a decrease in income levels caused by climate change. The results of the Present Value calculation also show that there is an economic loss for both small boats (<5GT) and large boats (>5GT), and the slope loss for small fishermen is steeper than for large fishermen. This indicates that large fishermen are more resilient to climate change than small fishermen. For an adaptation strategy, it is recommended that Tuna fishermen on the north coast of Aceh waters, both those in WPP 571 and 572, leave small boats and switch to larger boats (>5GT) which are proven to be more resistant to climate change than small boats (<5GT).

Keanekaragaman Ikan Invasif Di Perairan Umum Daratan Krueng Aceh

Aceh has a large potential for inland public water resources. One of the important inland waters is Krueng Aceh, Krueng Aceh is a river located in Aceh Province that originates at Cot Seukek, Aceh Besar District, passes through the city center (Peunayong) and empties into Lampulo, Banda Aceh City. The diversity of invasive fish in the inland waters of Krueng Aceh was carried out with the aim of identifying the types of invasive fish and to determine the diversity of invasive fish in the waters of Krueng Aceh as basic data in the management of inland common water resources. The research used a purposive sampling technique at sample points taken at 4 (four) points on the mainland of Krueng Aceh. Station 1 is located in Aneuk Galong Village, Station 2 is located in Bakoy Village, Station 3 is located in Pango Raya Village, Station 4 is located in Peunayong Village. The research results show that there are 9 types of fish in the public waters of the Krueng Aceh mainland which are dominated by baung fish. The station with the highest diversity results is station III located in Pango Raya which uses 4 types of fishing gear commonly used in the public waters of the Krueng Aceh mainland and gill net fishing gear is the most effective fishing gear used.

Rapfish: A Rapid Appraisal Technique to Evaluate the Sustainability Status of Pelagic Fisheries in North Aceh Waters

Rapfish is used as an indicator to assess pelagic fisheries' sustainability in Aceh's northern waters. This study aims to determine the sustainability of pelagic fishing and the factors that mostly influence the sustainability of pelagic fisheries. Surveys and interviews with questionnaires were conducted in collecting data, then analyzed by RAPFISH analysis with five dimensions. The results show that the ecological and economic dimensions are in a quite sustainable category, the social dimension is in a less sustainable category, the technological dimension is in the very sustainable category and the institutional dimension is in the less sustainable category. In addition, there are several indicators that most influence the sustainability of pelagic fisheries with purse seine on the ecological dimensions; (1) the location of fishing grounds; (2) the Fishing season. The economic dimension is influenced by (1) assistance from the government; (2) dependence on subsidies. Meanwhile, the social dimension is influenced by (1) The development of the number of fishermen; (2) The level of conflict. Lastly, the technological dimensions which influenced by (1) fishing vessel size; (2) Mechanical power, and institutional dimensions (1) The role of customary leadership, and (2) Fishermen's involvement in the process of preparing management regulations

The analysis of chlorophyll-a distribution in fishing areas of Aceh Waters

The distribution and abundance of fish are strongly influenced by several oceanographic parameters, one of which is chlorophyll-a. Chlorophyll-a is one of the oceanographic parameters that play an important role in primary productivity in the sea. The distribution of chlorophyll-a contained in phytoplankton can be used as a measure of fertility in water. With advances in geographic information systems or remote sensing, the distribution of chlorophyll-a can be used to estimate fish catchment areas. This study aims to look at the distribution of chlorophyll-a in Aceh waters both spatially and temporally to predict fishing locations. This study used satellite imagery combined with a Geographic Information System (GIS) to detect chlorophyll-a’s distribution. The results of satellite image processing show that the average monthly value of chlorophyll-a in Aceh waters ranges from 2.71 – 23.54 mg/m3, areas with high chlorophyll-a are generally located in the western waters of Aceh to the southwestern waters of Aceh, while areas with The lowest chlorophyll-a is generally in areas far from the coast (towards the open sea) with a range of 0.04 – 0.5 mg/m3 where the lowest average occurs in the east monsoon. However, in general, the potential locations for fishing grounds are more in the waters west of Aceh than in the waters north of Aceh, Aceh waters.Keywords:Chlorophyll-aSatellite imageFishing areaGeographic information SystemAceh Waters

Suspended sediment transport generated by non-hydrostatic hydrodynamics in Northern Waters of Aceh, Indonesia

Suspended Sediment transport in the Northern Waters of Aceh is investigated in the domains between 5.4° - 5.65° N Latitude and 95.15° - 95.45° E. Therefore, this study aims to calculate the suspended sediment transport using a non-hydrostatic hydrodynamic model with an output distribution of total suspended sediment concentration. The model was run using tidal components of M2, S2, K1, O1, N2, K2, P1, Q1 and the wind every 6 h in February and August 2019 representing the North East and South West monsoons, as well as sea temperature and salinity data. The results of the model correlated with the Tide Model Driver data obtained, and the simulation results indicated the current in February 2019 is different than in August. The numerical simulation results show that the distribution of suspended sediments in Northern Waters of Aceh is driven by currents. Furthermore, the hydrodynamics and the designed model showed that the distribution value of the surface total suspended sediment concentration was lower in August than in February 2019. The verification results of the surface total suspended sediment concentration between the model and the Visible Infrared Imaging Radiometer Suite showed a good match. These results can facilitate the analysis of limited observation and remote sensing data.

Molecular identification of sharks and rays species from Aceh waters, Indonesia

Shark is a cartilaginous fish that is widely hunted because it has high economic value. The waters of Aceh are directly adjacent to the Indian Ocean and the Malacca Strait making it a preferred habitat for pelagic fish, especially sharks. Information on shark species landed in the waters west and east of Aceh is very limited due to difficulties in identification and commonly used local names. This study aimed to determine the types of sharks landed in Banda Aceh, Meulaboh, Langsa, Southwest Aceh and Simeulu and to find out specifically what species of sharks are most often landed in Aceh waters. Primary data gathering consisted of four stages, namely sample collection, identification using identification books, molecular identification cytochrome oxidase subunit I (COI) and phylogenetic analysis. The results of the molecular analysis of 46 tissue samples from five locations identified 13 species of sharks, namely Carcharhinhus sorrah, Carcharhinhus amboinensis, Triaenodon obesus, Isurus oxyrinchus, Sphyrna zygaena, Sphyrna lewini, Loxodon macrorhinus, Hemipristis elongaria, Stagostoma fasciatum, Nebrius ferrugineus, Chilloscyllium punctatum, Isurus oxyrinchus, Alopias pelagicus, Alopias supercillosus and 1 species of rays, namely Rhynchobatus australiae. Phylogenetic tree reconstruction using the Neighbor Joining method of 610 basepairs consisting of two large clades separates the species Alopias pelagicus and Isurus oxyrichus with Carcharhinus sorrah, Sphyrna lewini, Loxodon macrorhinus and Rhyncobatus australiae with boostrap values of 87% and 64%. The haplotype diversity shown ranged from 0.667-0.889 while the nucleotide diversity ranged from 0.001-0.097. These values indicates high diversity because of the variance in the number of species found.Keywords:BarcodeCOISharks catchAlopias supercillosusSphyrna lewini