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Journal of Marine and Aquatic Sciences
Published by Universitas Udayana
ISSN : 23028114     EISSN : 25497103     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Journal of Marine and Aquatic Sciences (JMAS) adalah peer-reviewed, open access journal, diterbitkan oleh fakultas Kelautan dan Perikanan, Universitas Udayana. JMAS menerbitkan hasil peneitian original dan review artikel dalam bidang ilmu kelautan, manajemen sumberdaya perairan, dan aplikasi remote sensing di bidang kelautan dan perikanan.
Arjuna Subject : -
Articles 251 Documents
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Persentase Tutupan Karang Di Perairan Teluk Akle Kecamatan Semau Selatan Kabupaten Kupang Nusa Tenggara Timur Alexander Leonidas Kangkan; Ade Yulita Hesti Lukas; Sevanster Lakapu; Kiik Gretty Sine
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p12

Abstract

Akle Bay is one of marine aquaculture area in Semau island and it has coral reef potention. The coverage percentage of coral reef in the ocean might be decline by human activities and also by nature itself. The aimed of this research was analyzed to know the percentage of coral reef coverage in Akle Bay, South Semau District. This study conducted in Akle Bay, South Semau District on May 18, 2023st . Underwater Photo Transect (UPT) was used to take a sample in five meter depth at two different sites in Akle Bay waters. Data was analyzed by software CPCe 4.1. Result showed the highest benthic coverage percentage is soft coral. There were eleven genus of hard coral was found and its dominated by Porites genera. The percentage of hard coral coverage in S1 was 9.14%, while in S2 was 6.11% and was categorized in worst condition. The decline of coral reef coverage percentage in this area was expeted due to of human activities such as coral removal, the usage of anchor and the destructive fishing gear like a bomb, and also a sedimentation. According to the lifeform, covarage percentage of hard coral was dominated by coral branching. The average of current velocity in Akle Bay was 0,417 m/s with the range of waves was 0.1 to 0.5 meters. Conclusion of this research is the percentage of coral coverage in Akle Bay is worst. It was becacuse of human activities and sedimentation.
Pemetaan Sebaran Habitat Dasar Perairan Laut Dangkal Menggunakan Citra Sentinel-2A di Teluk Gilimanuk I Gusti Putu Bayu Arri Putra; I Dewa Nyoman Nurweda Putra; I Nyoman Giri Putra
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p03

Abstract

West Bali National Park is a conservation area with such a high biodiversity. That includes mangrove forest, coastal, and shallow water ecosystem. As a conservation area, a distribution map of the shallow water habitat is necessary for decision making in the conservation’s benthic habitat developing program. One of the mapping method is remote sensing and requires Sentinel-2A Level 1C satelitte image. Sentinel-2A Level 1C is used due to its high resolution which is 10x10 meters for a single pixel. The aim for this research is for mapping the distribution of the shallow water habitat in Gilimanuk Bay while also assesses the accuracy of Sentinel-2A image. This research uses the Quantum GIS and SAGA GIS software to analyze the Sentinel-2A image. The image is transformed using Depth Invariant Index to reduce the scattering effect on the reflectance. After the image is being transformed by the Depth Invariant Index, it is classified using maximum likelihood method. The classification showed, the area of each classes are 56.59 hectares of corals, 18.01 hectares of seagrass, 128.97 hectares of waters, 45.76 hectares of mud sediment, 78.95 hectares of macro algae, and 26.67 hectares of sands. Overall accuracy assessment for this research calculated using confusion matrix and the result is 65.1% and considered good enough due to Coral Ecosystem Remote Sensing Data Analysis Guide by National Institute of Aeronautics and Space (LAPAN), in which the tolerance of the accuracy is 60%. Accuracy levels are influenced by number of classes, image resolution, class resemblance, turbidity, and seafloor material.
Analisis Jesikapna Callia Br Guru Singa; I Wayan Nuarsa; I Gusti Ngurah Putra Dirgayusa
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p08

Abstract

Coastline changes are a process that occurs continuously due to movement of sediments, ocean currents, waves, and land use. The impact of this process can be in the form of abrasion and accresion. Due to the huge waves on the south coast, the beaches along the Klungkung Regency are often experience abrasion and accresion. Detection of coastline can use remote sensing methods. This study uses Sentinel-2 satellite images with a spatial resolution of 10 ms to extract the coasline of Klungkung Regency in 2015 and 2020. The coastline extraction method used is the threshold value and band ratio approach. In this study, the digital coastline analysis system (DSAS) toolbox was used for coastline change analysis. The analysis result of coastline change in Klungkung Regency in 2015 and 2020 shows that Gunaksa Village experienced the highest abrasion of 108,6 meters, while Negari Village experienced the highest accrestion of 46,98 meters. The highest rate of coastline change in Klungkung Regency is the abrasion range from 0,058 m/year to 1,846 m/year, while those accretion range from 0,055 m/year to 1,084 m/year.
Distribusi Mikrohabitat dan Infeksi Endoparasit pada Ikan Kembung (Rastrelliger sp.) yang didaratkan di PPI Kedonganan, Badung, Bali Claudy Margaretha Kandouw; Pande Gde Sasmita Julyantoro; Dewa Ayu Angga Pebriani
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p13

Abstract

Mackerel (Rastrelliger sp.) is a pelagic fish commodity that has high economic value because mackerel is a consumption fish and is easily found in all sea waters in Indonesia. Mackerel is a fish that is hunted for consumption because of its high omega-3 content, so it is really necessary for us to pay attention to the quality of the mackerel from the threat of parasites that can cause disease. This research was being conducted to determine the distribution of endoparasite microhabitats, intensity, prevalence, and the relation between the length of the fish and weight of fish with the number of parasites. The research samples were collected from Kedonganan Fish Landing Base, Badung, Bali, which was carried out from October 2021 to November 2021. The research used a descriptive quantitative method and the sampling method was carried out by random sampling. The total samples of fish examined were 35 fish consisting of two species, R. Kanagurta (20 fish) and R. brachysoma (15 fish). Endoparasites of the Anisakis genus were parasites with the highest intensity and prevalence values : 4,06 ind/fish and 82,86% with a low infection rate. The relation between the length of the fish and body weight of fish with the number of parasites was in the opposite direction and had a very low effect with a value of correlation (r) between length and the number of parasites are 0,031 and a value of correlation (r) between weight and number of parasites are 0,00547.
Struktur Komunitas Makroalga di Pantai Pandawa, Bali Anak Agung Raka Triyana Putri; Dewa Ayu Angga Pebriani; Ni Luh Watiniasih
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p04

Abstract

Macroalgae are classified as low-level plants (thallophyta), no have vascular and have a vegetative body that has not recognized the differentiation of the roots, stems and leaves, so it is called a thallus. This aims to determine the diversity of macroalgae species and the percentage of maroalgae cover in the waters of Pandawa Beach. The research was conducted for 2 months from January-February 2021. This study used a descriptive method with a quantitative approach. The data were collected at 3 stations using the 1x1 m2 quadrant transect of method. The results of the study found 17 types of macroalgae on Pandawa Beach including Halimeda macroloba, Padina australis, Ulva lactuca, Palmaria palmata, Galaxaura rugosa, Laurencia papillosa, Gracilaria textorii, Turbinaria deccurrens, Halimeda opuntia, Kappaphycus alvarezii, Gracilariopsis longissimi, Chondrococcus hornemannii, Amphiroa fragilissima, Chondrus crispus, Halymenia floresii, Amphiroa rigida, and Phyllophora crispa. The highest abundance value of macroalgae species was Laurencia papillosa species with a total of 2,87 individuals/m2. Based on the results of the calculation of the diversity index value on Pandawa Beach is 1,44-2,02 so it is included in the medium category. The uniformity index value on Pandawa Beach is 0,69-0,87 so it is included in the medium category. The dominance index value on Pandawa Beach is classified as a low category with a value of 0,17-0,28. The highest percentage value of macroalgae cover on Pandawa Beach was Laurencia papillosa with 0,53-2,87%.
Perbandingan Beberapa Metode Klasifikasi Menggunakan Citra Landsat dan Sentinel Untuk Pemetaan Sebaran Mangrove Di Kawasan Ekowisata Mangrove PIK Jakarta Utara Muhamad Alfiansyah; I Wayan Nuarsa; Ida Bagus Mandhara Brasika
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p09

Abstract

Mangroves are one of the coastal ecosystems that have many functions and have a very large role for living things associated with mangroves. One of the mangrove ecosystems in DKI Jakarta is in the Mangrove Ecotourism Area of the Sedyatmo Toll Road, North Jakarta. Remote sensing technology is the right method for mangrove monitoring activities that are efficient, effective and wide area coverage. Mangrove mapping is one of the remote sensing techniques to determine the distribution of mangroves in a region. This study aims to assess mangroves and compare the accuracy of the supervised classification method (Maximum Likelihood, Minimum Distance) and object based classification in the distribution of mangroves in the Mangrove Ecotourism Area of the Sedyatmo Toll Road using Landsat 8 and Sentinel-2A images. Comparison of the results of the supervised classification and object based classification of the two images to be tested for accuracy using a confusion matrix. The results showed that the mangroves were evenly distributed along the Sedyatmo toll road and its surroundings with an average mangrove area of >60 ha. In Landsat 8 imagery, the Overall Accuracy for the classification of Maximum Likelihood is 87,50%, Minimum Distance is 75,00% and object based classification is 89,83%. Sentinel-2A image classification results Overall Accuracy classification method Maximum Likelihood 89,83%, Minimum Distance 77,50%, and object-based classification 90,00%. The results of the Overall Accuracy show that object-based classification is better than the Maximum Likelihood and Minimum Distance classifications in mapping the distribution of mangroves on Landsat 8 and Sentinel-2A images.
Studi Kesesuaian Pantai Jemeluk Sebagai Kawasan Wisata Bahari Kabupaten Karangasem, Provinsi Bali I Gusti agung bayu Setiawan; I Gusti Bagus Sila Dharma; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p05

Abstract

Jemeluk Beach is located in Purwakerti village, district of Abang, Karangasem regency. Jemeluk Beach is a developing tourism sector in Karangasem, which has the potential for coral reefs and various types of reef fish. Jemeluk Beach has snorkeling and diving tourism activities to develop its potential. With this is potential, s necessary to conduct research to analyze and develop suitable snorkeling and diving tours in the waters of Jemeluk Beach. This research was conducted at Jemeluk Beach, there are 6 stations in the research sampling. Collecting coral reef data using the Underwater Photo Transect method. Determination the level of the suitability of the area as a diving and snorkeling tourism spot using a matrix of area suitability analysis that considered the parameters of ecological conditions and water quality conditions using three parameters. The result showed that coral reef cover value ranged from 35,78% - 81,0%, the types of lifeform found ranged from 8 - 10 species, the water transparency value ranged from 57,78 - 82,22%, the water depth at stations 1, 2 and 3 is 3 - 4 m, station 4 is 10 - 15 m, and stations 5 and 6 are 5 - 10 m, current speed ranged from 11-15 cm/s, and the tourism suitability index (IKW) for the snorkeling and diving category at Jemeluk beach is included in the S2 category, which is conditional.
Analisis Kesehatan Ekosistem Mangrove di Kawasan Taman Nasional Bali Barat (TNBB) Dina Deartha Vansari Damanik; I Gusti Ngurah Putra Dirgayusa; Gede Surya Indrawan
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p10

Abstract

Mangrove ecosystems are ecosystems located in coastal areas that are affected by tides and have many functions, namely ecological, physiological and economic functions. The purpose of this study was to determine the health condition of the mangrove ecosystem and the diversity of mangrove species in the West Bali National Park area. The technique applied in this study was a purposive random sampling method, with a total of 65 plots, and to determine the health condition of the mangrove ecosystem using the Hemispherical photography method. The mangrove species found at the observation site were Avicennia offinalis, Aegiceras floridum, Bruguiera cylindrica, Ceriops tagal, Lumnitzera racemose, Rhizophora apiculata, Rhizophora mucronata, Sonneratia alba, and Sonneratia caseolaris. The value of mangrove health conditions is determined from several parameters such as canopy cover which has a range of cover values ranging from 51.35% - 66.67% with an average percentage cover of all data collection stations of 60.27%, density has a value range of 2100 trees/ha – 8867 trees/ha, with a diversity value of 0.97 in the low diversity category, and with an average environmental parameter value such as temperature around 28.1 ± 0.56?, while the average value of salinity is 22.3 ±3.27‰, and the average pH was 5.9±0.12, with sandy mud substrate dominating the entire observation area.
Pemanfaatan Tepung Lemna sp. dan Enzim Non-Starch Polysaccharides (NSPs) Pada Pakan Ikan Tambakan (Helostoma temminckii) Sefti Heza Dwinanti; Kekey Zakaria; Muhammad Amin; Madyasta Anggana Rarassari
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p01

Abstract

Lemna sp. is one of the local raw materials that can be used to substitute fish flour and soybean meal in fish feed formulation because its protein contain. However, protein plant-based in fish feed formulation need additional enzyme (exogenous) such as Non starch polysaccharides (NSP) enzyme which able to increase feed digestibility. The aim of this study is to determine the effect of NSP enzyme to Lemna sp. flour in feed formulation for kissing gouramy’s growth and feed efficiency. This research has been conducted at the Experimental Pond Laboratory, Aquaculture Study Program and Laboratory of Chemical and Microbiology of Agricultural Products, Department of Agricultural Technology, Faculty of Agriculture, Sriwijaya University. Juvenile kissing gourami 4±0,5 cm in length were used and culture in certain condition which was temperature 25-27 °C, pH 6, dissolved oxygen > 2.5 mgL-1 and ammonia <0.1 mgL-1. The Rovabio Excel AP10 T-Flex were used as NSP enzyme. Completely Randomized Design (CRD) was used with 4 treatments (Tn) and 3 replications, namely the addition of Lemna sp. flour 0% without enzyme (T0), addition of Lemna sp. flour 0% with enzyme (T1), addition of Lemna sp. flour 5% without enzyme (T2), addition of Lemna sp. flour 5% with enzyme (T3). NSP enzyme dose is 1 g/kg feed material. The results showed that T3 gave the best results with absolute weight growth 0.91 g, absolute length growth 0.63 cm, specific weight growth rate 1.35% day-1, specific length growth rate 0, 41% day-1, survival 100%, and feed efficiency 28.59%.
Estimasi sebaran konsentrasi total suspended solid (TSS) di Tahura Ngurah Rai Denpasar tahun 2016 dan 2020 Ketut Listyani Sri Rejeki; I Dewa Nyoman Nurweda Putra; I Wayan Nuarsa
Journal of Marine and Aquatic Sciences Vol 9 No 1 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i01.p06

Abstract

The large number of mangrove land conversions can cause various impacts, such as causing coastal abrasion to affect sedimentation rates. One of the variables used to determine the level of pollution and sedimentation that occurs in aquatic ecosystems is Total Suspended Solid (TSS). Based on research conducted by Sebastian (2020), mangrove land cover in Tahura Ngurah Rai decreased by 25.58 hectares in 2016 - 2020 due to the mass mortality of mangroves in 2019. The decline in mangrove land in this location allows an increase of TSS in the surrounding waters due to the lack of mangroves which function as a barrier and sediment trap. One of the satellite that have been widely used in observing the distribution of TSS concentrations is the Landsat-8 OLI. Therefore, researchers are interested in knowing the changes in TSS concentrations that occurred in Tahura Ngruah Rai in 2016 and 2020 using Landsat 8 imagery. This study used a gravimetric method to analyze TSS concentrations in situ at 45 sample points carried out by random sampling. To find out the spatial estimation of TSS in 2016 and 2020, an empirical algorithm is used. The best TSS estimation model in this study is the combination of the blue band/ SWIR-1 band using linear equations. The processing results show the concentration of TSS in 2016 has a range between 66 mg/L to 264 mg/L with an average of 127.74 mg/L, while . In 2020 TSS has a range between 72 mg/L to 209 mg/L with an average of 133.04 mg/L.

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