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Journal of Marine Research and Technology
Published by Universitas Udayana
ISSN : 26210088     EISSN : 26210096     DOI : 10.24843/JMRT
Core Subject : Science,
Earth & Planetary Sciences
The Journal of Marine Research and Technology (JMRT) (p-ISSN 2621-0088 | e-ISSN 2621-0096) is an open access, scientific journal that aims to publish the dynamic of the coastal and ocean, its ecosystems and coastal environment, and Observation technology. JMRT is a peer-reviewed journal publishes original articles and critical reviews of current issues in marine science and technology. The range of topics extends from research in Oceanography, marine habitats, living resources, management and conservation issues related to the marine resources. This includes remote sensing, ocean modelling, geographic information System (GIS), coastal engineering, coastal processes, marine instrument, ecology, genetics, marine pollution, fisheries, marine ecotourism, and it's economic and social. JMRT provides a forum for the discussion and sharing all the latest issues in marine research and technology. Editorial manager system is an online manuscript submission, review and tracking system. JMRT is issued twice a year, each February and August.
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Articles 101 Documents
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Hubungan Panjang-Bobot dan Faktor Kondisi Ikan Estuarine Glass Perch (Ambassis macracanthus Bleeker, 1849) di Perairan Taman Hutan Raya (Tahura) Ngurah Rai, Teluk Benoa, pada Musim Timur Franceska Kendra Rossa S; Nyoman Dati Pertami; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 6 No 2 (2023): AGUSTUS 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i02.p10

Abstract

The growth aspect is important in determining fish well-being in an area. However, research on the growth aspect of Ambassis macracanthus Bleeker, 1849, in Ngurah Rai Forest Park has never been conducted This study aims to determine the length-weight relationship and condition factor of A. macracanthus as well as to evaluate the water condition in Ngurah Rai Forest Park, Benoa Bay during the east season. The sample was collected applying descriptive and quantitative methods, whilst the purposive sampling method was used to take the samples from three stations using Bubu and experimental gill net. During the sampling collection process, 304 fish individuals were caught by the experimental gill net at station 1 (Serangan waters). Based on the analysis between the length and weight relationship of A. macracanthus, the equation of W=0,024L2.38, where from this equation, the value of b = 2.38 is obtained. Through the T-test, the value of b < 3 showed a negative allometric growth pattern; namely, the growth in length is more dominant than the increase in weight. The average relative condition factor increased monthly, with the highest value of 1.37 in August. However, the value of the relative condition factor indicates that the fish in Tahura waters are thin (Kn < 2). In general, the temperature and dissolved oxygen of Ngurah Rai Forest Park waters are not following quality standards.
Studi Perubahan Garis Pantai di Teluk Penyu, Cilacap, Jawa Tengah Menggunakan Citra Sentinel-1 dan Sentinel-2 Azhar Muhammad Hanisa; Abd. Rahman As-syakur; I Wayan Gede Astawa Karang
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p02

Abstract

The coastline is defined as the location where water and land contact at any given time. Coastline change is considered as one of the most dynamic processes in coastal areas and is an indication of coastal accretion and erosion. The process of accretion and erosion can cause beach conditions to become unbalanced and even damaged. Cilacap Regency has a coastline of approximately 80 km which is directly adjacent to the Indian Ocean. The coast of Cilacap experienced changes in coastline which tended to be high from 1999-2008. For this reason, research has been carried out regarding coastline changes in Penyu Bay using remote sensing. The data used are Sentinel-1 and Sentinel-2 satellite images for 2016 and 2021. The analysis of shoreline changes uses the Digital Shoreline Analysis System (DSAS). The results of an analysis of shoreline changes in Penyu Bay from 2016 to 2021 show an average accretion of 1,278.49 m2 at Sentinel-1. While Sentinel-2 shows an average accretion of 2,917.68 m2. The average rate of line change per year on Sentinel-1 is 1 m/year with an indication of accretion and Sentinel-2 is 1,11 m/year with an indication of erosion. Accuracy test with Root Mean Square Error shows that Sentinel-1 is 36.80 m and Sentinel-2 is 15.43 m. Sentinel-1 has an accuracy value (CE90) of 55.84 m in class 2 with a scale of 1:100,000, while Sentinel-2 is 23.41 m in class 2 with a scale of 1:50,000.
Laju Pertumbuhan dan Tingkat Kelangsungan Hidup Karang Jenis Acropora formosa dan Acropora intermedia Menggunakan Metode Transplantasi Modul Rangka Spider di Perairan Pantai Lipah, Desa Bunutan Kabupaten Karangasem, Bali Basyaasyah Rahmaningrum Pettalolo; Dwi Budi Wiyanto; I Gusti Ngurah Putra Dirgayusa
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p07

Abstract

Lipah Beach holds the potential for coral reefs, although this potential is considered moderate due to anthropogenic destructive activities. The spider skeleton method has been employed as a coral rehabilitation effort at Lipah Beach. Aside from its cost-effectiveness, the spider framework also provides a waterway. The success of coral rehabilitation can be measured by assessing the growth rate and survival rate of transplanted corals. Corals of the Acropora genus, including A. formosa and A. intermedia, are known for their rapid growth and high resilience. These corals possess significant aesthetic value but are currently threatened as they continue to be traded. The primary objective of this research is to determine the growth rate and survival rate of transplanted A. formosa and A.intermedia using the spider skeleton method. The research adopts an experimental approach with direct observation. Each type of coral, A. formosa and A. intermedia, is represented by 20 fragments, totaling 40 transplanted fragments. The study spans over 4 months to monitor coral growth and survival rates, along with monthly measurements of seawater quality parameters to assess their conditions. The findings reveal that A. intermedia exhibits a growth rate of 0.81 cm per month, surpassing that of A. formosa, which measures 0.73 cm per month. Conversely, the survival rate of A. formosa is higher at 75% compared to A. intermedia at 70%. By the end of the study, 15 fragments of A.formosa and 14 fragments of A. intermedia remained viable.
Hubungan Antara Kelimpahan Ikan dengan Tutupan Lamun di Perairan Sanur, Bali Bertha Ayu Andhira; Gede Surya Indrawan; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p03

Abstract

Seagrass is aquatic ecosystems that is very beneficial for marine biota. One of the functions of seagrass fields is as a place to live, shelter, and place to find food for various types of fish. The correlation between seagrass and fish is very close, this study aims to decide the association between the abundance of the fish and the coverage of seagrass cover in Sanur, Bali. Samples were taken at two stations in Sanur which represented high seagrass cover, namely Sindhu Beach, and medium cover, namely Karang Beach. Data collection on seagrass cover and types was used in a 100 m line transect. The method that is used for taking the number and type of fish is using two methods, namely underwater visual census and beach nets. The results found eight species of seagrass, including Enhalus acoroides, Thalassia hemprichii, Syringodium isoetifolium, Cymodocea serrulata, Cymodocea rotundata, Halodule uninervis, Halodule pinifolia, and Halophila ovalis. Seagrass cover on Sindhu Beach is 72.2%, and Karang Beach is 50.2%. The fish found were 1,180 individuals, including 41 species from 18 families. The greatest abundance was in Sindhu Beach, which was dominated by Plotosus linneatus from the Plotosidae family, with a relative abundance of 30%, and the lowest abundance was on Karang Beach with the Plectorhinchus vittatus from the Haemulidae family, with a relative abundance of 0,2%. Diversity is worth 2.83, Variety is 0.80, and Dominance is 0.13. The correlation between fish abundance and seagrass cover is categorized as positive with a value of 0.8924 which indicated that a high seagrass cover has a high fish abundance and vice versa.
Pengaruh Warna Lampu yang Berbeda terhadap Laju Pertumbuhan Chaetoceros calcitrans Rijal Rahmatullah; I Wayan Nuarsa; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p08

Abstract

Chaetoceros calcitrans is one of the diatoms commonly used as a natural feed for cultivated fish larvae. The cultivation of C. calcitrans as natural feed is influenced by various factors, including light as a source for photosynthesis. This research aimed to determine the effect of different light colors on the growth rate and identify the optimal color for the growth rate of C. calcitrans. The research was conducted at the BPIU2K Karangasem laboratory. The experimental method with a Completely Randomized Design (CRD) was employed, consisting of three treatments and one control. Treatment A used yellow-colored lights, treatment B used blue-colored lights, treatment C used green-colored lights, and treatment D served as the control using white-colored lights. The observed parameters included population density, specific growth rate, and doubling time. The results were analyzed using ANOVA. The findings indicated that the light color significantly affected the population density, specific growth rate, and doubling time with a value of (Sig.<0.05). The best treatment was the use of white-colored lights, followed by yellow-colored lights, which resulted in the highest density on the 5th day, reaching 1.238,88 x 104 cells/ml and 1.040,55 x 104 cells/ml, respectively. The specific growth rate for white and yellow lights was 8.51%/hour and 7.53%/hour, respectively. The doubling time for white and yellow lights was 14.93 hours and 15.75 hours, respectively. White and yellow light irradiation exhibited wavelengths suitable for the cultivation of C. calcitrans.
Analisis Isi Perut Ikan Apogonidae di Teluk Gilimanuk, Bali Ni Luh Putu Emi Trisna Dewi; I Nyoman Giri Putra; I Putu Yogi Darmendra
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p04

Abstract

The types of natural food consumed by fish can vary according to their species and its age level. The purpose of this study was to determine the types of organisms feed by Apogonidae fishes by observing their gut contents and to determine the type of feeding habits of these fishes. This research was conducted at two sampling sites within Gilimanuk Bay, Bali. Specimen collection was conducted in the morning (07.00 am) using a scoop net while scuba diving. We successfully collected 32 individual Apogonidae, which consist of eight species. Each sample was dissected and the contents of the stomach were removed from the esophagus to the intestine. The stomach contents were preserved using 4% formalin, and then the samples were observed under a binocular microscope with 40x magnification. The results showed that the highest composition of food species found as the main food was the Copepod of 59.86% which was fed by Sphaeramia nematoptera, Cheilodipterus artus, Fibramia thermalis, Pterapogon kaudernii, Zoramia leptacantha, Rhabdamia gracilis, and Ostorhichus hoevenii, Bacillariophyceae by 31.97% were feed by S. nematoptera, C. artus, O. hartzfeldii, F. thermalis, P. kauderni, Z. leptacantha, R. gracilis, and O. hoevenii. The other class of plankton only made up a small part of the food composition of the Apogonidae fishes, which is as much as 8.16%. Based on our results, we conclude that Apogonidae fishes in Gilimanuk Bay were plankton feeders where all the food found comes from phytoplankton and zooplankton organisms.
Analisis Status Mutu Air Laut Berdasarkan Metode STORET di Pelabuhan Gilimanuk Bali Valenthio Sidauruk; I Wayan Gede Astawa Karang; I Dewa Nyoman Nurweda Putra
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p09

Abstract

The harbor area has a high risk of pollution. Anthropogenic activities such as ship operations, ship traffic and material used by ships will trigger a decrease in water quality and have a negative impact to the water in harbor area. This study aimed to determined the content of parameters and water quality status at Gilimanuk Harbor, Bali. Samples were taken during the transitional of Summer and Rainy season (September-November 2022) three times with a one-month interval. The parameters used in this study were: temperature, Total Suspenden\d Solid (TSS), pH, salinity, ammonia, lead and coliform. The additional parameters in this study are rainfall, wind and currents to determine the relationship between data. Water quality status in this study was analysed by STORET method, with the water quality standard referenced The Government Regulation Number 22 of 2022 for harbor waters. The parameters that exceeded the water quality standard in this study were Ammonia and the water quality status for the port waters based on the STORET method, specifically at a distance of 50 meters and 500 meters from the shore is class A with (Not Polluted) category while at a distance of 1000 meters from the shore is class B (Lightly Polluted) category. With these results, it can be seen that rainfall, wind and currents have an impact on the distribution of pollutants in the sea water.
Pemetaan Terumbu Karang Berbasis Citra Unmanned Aerial Vehicle (UAV) Dan Satelit Sentinel-2A Dengan Metode Object Based Image Analysis (OBIA) Di Perairan Pulau Menjangan Bali Ramadhani Ahmad; I Dewa Nyoman Nurweda Putra; I Putu Yogi Darmendra
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p05

Abstract

There is still little research on mapping benthic habitats on Menjangan Island, so the availability of spatial data in this area is still limited. This research aimed to map coral reefs using UAV imagery and Sentinel-2A imagery with the object-based/OBIA classification method and calculate the level of accuracy of classification results in the waters of Menjangan Island. This research was conducted in 4 water areas, especially waters where diving and snorkeling activities often occur. This research used Sentinel-2A satellite data acquired on March 17, 2022, and UAV data acquired on March 30, 2022. Area 1 live coral (KH) with an area of 0.76 Ha for UAV imagery, live coral (KH) on Sentinel imagery -2A, namely 0.64 Ha. Region 2, the area of live coral (KH) in the UAV image is 0.67 Ha, and live coral (KH) in the Sentinel-2A image is 0.49 Ha. Region 3, the area of live coral (KH) in the UAV image is 0.77 Ha; in the Sentinel-2A image, it is 0.60 Ha. The 4 live coral (KH) areas in the UAV image have an area of 0.83 Ha, and the live coral (KH) in the Sentinel-2A image covers an area of 0.62091 Ha. UAV imagery can produce an overall accuracy in each region of 97.96% in Region 1. 98.21% in Region 2, 98.84% in Region 3, and 96.77% in Region 4. The overall accuracy level of Sentinel-2A imagery is 85.71% in Region 1, 83.93% in Region 2, 86.05% in Region 3, and 83.87% in Region 4.
Penerapan Kebijakan Indonesia Sebagai Negara Anggota Organisasi CCSBT Commission for the Conservation of Southern Bluefin Tuna) Terhadap Pemberantasan IUU (Illegal Unreported and Unregulated) Fishing serta Penerapan Kuota Penangkapan Selvi Dwi Septiarini; , I Wayan Nuarsa; Ni Luh Putu Ria Puspitha
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p10

Abstract

Illegal, unreported, and unregulated fishing happens globally, especially in Indonesian waters; one of the problems that is often faced is compliance with fishing quotas. Furthermore, as a CCSBT member nation, Indonesia must adhere to all provisions put in place for the preservation of fish resources, particularly southern bluefin tuna. One of their requirements, following the provisions on the number of catches that apply to Indonesia, is to eradicate IUU fishing and fishing quotas; this study attempts to ascertain the measures made by Indonesia to enforce compliance with the CMM’s implementation for CCSBT. Interview method and an examination of relevant papers and regulations were used in this research tuna associations and government organizations involved in the management of bluefin tuna collected in 2021, Indonesia was 99% free from over quota according to the result of alleged IUU infractions committed by one of the tuna fishing vessels in the Indian Ocean RFMO area. Indonesia is required to pay back 91.3 tons per year over the following 5 years despite breaking the rules established by international bodies in 2019–2020. After the punishment, Indonesia is being more proactive in putting various initiatives into action to ensure the sustainability of southern bluefin tuna in the future.
Uji Aktivitas Antibakteri Ekstrak Rumput Laut Kappaphycus alvarezii Terhadap Bakteri Vibrio parahaemolyticus, Vibrio campbellii, dan Aeromonas hydrophila Errina Bening Ambartyasning; Pande Gde Sasmita Julyantoro; Widiastuti Widiastuti
Journal of Marine Research and Technology Vol 7 No 1 (2024): FEBRUARI 2024
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2024.v07.i01.p01

Abstract

The bacteria Vibrio parahaemolyticus and V. campbellii are the pathogens of Vibriosis in various marine cultured organisms. Moreover, Aeromonas hydrophila is the pathogen of the Motile Aeromonad Septicemia (MAS) disease. Therefore, it is needed to inhibit these bacteria's activity. Studies showed that the extract of seaweed Kappaphycus alvarezii could hinder the growth of gram-negative and gram-positive bacteria; however, the antibacterial activities against V. parahaemolyticus, V. campbellii, and Aeromonas hydrophila remain unknown. Thus, this study aimed to analyze the antibacterial activity, and the minimum inhibitory concentration of K. alvarezii extract against V. parahaemolyticus, V. campbellii, and A. hydrophila. K. alvarezii was collected from the cultured in the Geger Beach area, Badung Regency. The methanol K. alvarezii extracts with different concentrations (10, 5, 1, 0.05%) were dropped to the paper disk and placed on the bacterial tested cultures. Inhibition zone measurements were carried out every 6 hours during the 24-hour incubation period. Chloramphenicol and methanol were also tested as the positive and negative control, respectively. Results showed that the antibacterial activity was only demonstrated in 10% extract against V. campbellii with an inhibition zone of 12.5 mm.

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