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Journal of Marine Research and Technology

JMRT
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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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Studi Variabilitas Produktivitas Primer Bersih di Perairan Selatan Indonesia Berdasarkan Data Satelit Aqua Modis Ni Nyoman Raka Wulandari; Ni Luh Novita Aryanti; I Gede Hendrawan
Journal of Marine Research and Technology Vol 2 No 2 (2019): AGUSTUS 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

The Indonesian waters have special characteristics which are influenced by its existence between the two continents and two oceans. The placement between two continents and oceans resulted in highly dynamic oceanographic conditions, one of them being primary productivity. Net primary productivity in a water body is strongly influenced by the presence of nutrient, light, chlorophyll-a, Photosynthetically Active Radiation (PAR) and sea surface temperature (SST). The purpose of this research is to find out the net primary productivity variability in the south Indonesian waters based on Aqua-MODIS. The data used in this research are obtained using satellite data and a VGMP model (a vertically Generalized Production Model) is used to analyse the net primary productivity. One of the satellite images can be used to estimate the net primary productivity in the waters is MODIS (Moderate Resolution Imaging Spectroradiometer) sensor, with specifications of level 3 with a resolution of 4 km. The results obtained of net primary productivity value in the southern waters of Indonesia showed 150 mgC m2 day -1 - 200 mgC m2 day -1, with the highest peak being in November 2006 and the lowest in September 2010. The highest value of net primary productivity is caused due to upwelling waters events found.

Struktur Komunitas Makroalga Di Perairan Tenggara Pulau Serangan, Bali Ni Luh Putu Ayu Sumarni; I Wayan Gede Astawa Karang; Widiastuti Karim
Journal of Marine Research and Technology Vol 2 No 2 (2019): AGUSTUS 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Macroalgae is one of the biota that is found in all Indonesian waters. Macroalgae has an important role in marine ecosystems, namely as producers, ingredients and pharmacy. The purpose of this research was to determine the community structure of macroalgae. The community structures were measured by using a square transect of 1x1 m2 within a 50 m2 squared transect. Thus macroalgae were determined for its density, diversity, biomass and distribution. The differences among community structures at each station were analyzed by using the One-way Anova. The results showed that the macroalgae were classified into red, brown and green macroalgae. The highest macroalgae density wasw 21 ind/m2 and the lowest was 8 ind/m2. The diversity of macroalgae was in the medium category which the most dominant was red macroalgae. It is likely due to different ability to get the nutrients among macroalgae. The highest biomass was found in the red macroalgae while the lowest was in the green macroalgae. It might be related to the large size and weight of the thallus of red macroalgae. The One-way Anova analysis showed that there was a significant difference in macroalgae density and biomass at each station.

Daya Dukung Kawasan (DDK) Wisata Pantai di Pantai Pandawa, Kecamatan Kuta Selatan, Kabupaten Badung, Bali I Dewa Ayu Ratna Raksa Eka Putri; I Wayan Gede Astawa Karang; Ni Luh Putu Ria Puspitha
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Pandawa Beach is a famous tourist destination among locals and foreigners, located in Kutuh village, Kuta Selatan sub district, Badung regency, Bali. Tourism activities can create various negative impacts on the surrounding environment because increased human interference in ecologically areas, the massive development of tourism has affected balance of nature ecosystem in an area, especially the carrying capacity. Carrying capacity is a concept developed for natural resources and environmental management to prevent the occurrence of environmental disturbance or destruction. The researches about carrying capacity it so necessary to find out, has suitable or non suitable carrying capacity, especially at Pandawa beach on the high season at the beginning year (January-early March 2019). The method used in this research was conducted with field observations for primary data collection with the method of interviews to tourists, while the secondary data was obtained from shore managers and literature studies. The data required was wide of the area, the time required enjoyed based on activities type. The result found that wide of area (Lt) required for tourism in high season was 95.09 , time required for tourist activities (Wp) was 2.08 hours. The carrying capacity of Pandawa beach is 9.907 people/day or 307.111 people/month, 3.685.327 people/year which is classified as under carrying capacity. With a carrying capacity of 9.907 people/day, it would be very good if the utilization of the carrying capacity of only about 5.000 people/ day. When the high season conditions in 2019 the number of tourists visiting Pandawa Beach is still in a reasonable condition or classified as under carrying capacity.

COVER VOLUME 3 NO 1 admin JMRT
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

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COVER VOLUME 3 NO 1

Identifikasi jenis penyakit dan prevalensi penyakit karang pada terumbu karang diperairan pemuteran Putu Hernanda Krishna Ariszandy; I Dewa Nyoman Nurweda Putra; Widiastuti Widiastuti
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Coral reef ecosystems play an important role in many aspects of human beings as one third of Indonesian population are living in coastal areas and depend their lives on this ecosystem. However, this ecosystem is threatened by various factors, one of them is coral disease. Increased sea water temperature, sedimentation, and pollutants can increase the growth of pathogenic microorganisms that cause coral disease. The data of coral diseases was collected byqpurposive samplingpmethod which was chosen based on the presence of coral reefs and coastal conditions at each station in a belt transect of 20 x 2 m. Furthermore, coral diseases and coral species were identified based on identification books. The prevalence of coral disease was calculated by divided the total number of coral colonies with the total number of diseased coral then multiplied by 100%. Results showed that the highest coral disease prevalence were at site 3 and 4. Meanwhile, site 1 and 2 were lower than those sites. It was suggested that the coral disease prevalence is related to the domestic input from the coastal. As site 1 and 2 were relatively low populated than site 3 and 4.

Analisis Kelimpahan dan Identifikasi Predator Abalon (Haliotis squamata) di Pantai Geger, Nusa Dua, Bali Jefry Cristian Bulan; I Gede Hendrawan; Ni Luh Putu Ria Puspitha
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

This research was conducted at Geger Beach, Nusa Dua, Bali for 30 days. The purpose of this study was to determine the abundance of Haliotis squamata abalone predators at Geger Beach, Nusa Dua, Bali and to find out the types of Haliotis squamata abalone predators. The method used is Underwater Visual Census by using belt transects with a length of 50 meters with a distance of 2.5 meters left and right side 2.5 meters with a total area of 250 m2. This research was conducted at 3 different points with the addition of the abalone drum area as observations of more specific abalone predators with the help of cameras. The results of this study were the discovery of morey eel predators (Gymnothorax thyrsoideus) in the arae in the Haliotis squamata abalone drum and in the transect area there were more eels (Gymnothorax thyrsoideus) and Epinephelus sp. The results of predator abundance at point 1 were obtained for 0.0053 individuals / m2 for Gymnhotorax thyrsoideus type and for types of Epinephelus sp had a value of 0.0013 individual / m2, at point 2 it was 0.013 individuals / m2 for Gymnhotorax thyrsoideus and for Epinephelus sp has a value of 0.040 individuals / m2, at point 3 is 0.027 individuals / m2 for the type of Gymnhotorax thyrsoideus and for this type of Epinephelus sp has a value of 0.0013 individual / m2

Pengujian dan Penentuan Spesies Gastropoda sebagai Bioindikator di Kawasan Reboisasi Mangrove Kepulauan Seribu, Indonesia Syahrial Rial; Muhammad Fauzan Isma; Ahmad ryadi; M. Ilham Fajriansyah
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

The development of coastal zones throughout the world has resulted in changes in the order of the mangrove ecosystem, therefore, planting activities are carried out in various regions. The study of the testing and determination of gastropod species as bioindicators in the mangrove reforestation area was carried out in the Seribu Islands. This research aims to determine how suitable the gastropod species are used as bioindicators in assessing the success of mangrove reforestation, especially in the Seribu Islands. Collection of gastropod species is done by making line transects and plots drawn from the reference point (outermost mangrove stands) and perpendicular to the coastline to the mainland. Line transects are made of plots of size 10 x 10 m and in the size of 10 x 10 m a small plot of 1 x 1 m is made. Furthermore, testing is carried out with several criteria and analyzed using multivariate Principal Component Analysis (PCA) statistics. The results of the study show that the species Littoraria scabra has met all the specified testing criteria. Then L. scabra also has the highest eigenvalue compared to the other species, making it suitable to be used as a bioindicator species in assessing the success of the Seribu Islands mangrove reforestation.

Hubungan Rugositas Terumbu Karang terhadap Struktur Komunitas Ikan Corallivor dan Herbivor di Perairan Pemuteran, Bali Nidzar Muhammad Rafly; I Wayan Gede Astawa Karang; Widiastuti Widiastuti
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Reef fishes are the highest number of organisms that can be found in coral reefs in which the abundance depends on the healthy of this ecosystem. Reef fishes are mainly consisted of corallivorous and herbivorous fish. Corralivorous fish feeds on coral polyps while herbivorous fish feeds on algae. Therefore these fishes are an important indicators in the resilience of coral reefs. Studies showed that its abundance is strongly correlated with reef’s conture (rugosity). Pemuteran waters is one of developing tourists attraction in the north Bali island. However, the data of reef fishes and coral reefs in Pemuteran waters remain limited. Therefore, this research aimed to study the reef` condition and rugosity in Pemuteran waters, also to examine the correlation between reefs fishes and reefs rugosity in this area. There were four stations according to purposive sampling method. Data of corallivorous and herbivorous fishes were collected by using the underwater visual census with a 40 m2 transect. Reef rugosity index were determined by using chain transect method. Results showed that reef rugosity in Pemuteran waters was in the medium to high category. Reef rugosity has strong correlation with the total abundance and diversity of corallivorous fishes. However, reef rugosity was only strong correlated with the total abundance but not with the diversity of herbivorous fishes.

Estimasi total simpanan karbon Pada Padang Lamun di Kawasan Pantai Karang Sewu, Gilimanuk, Bali Komang Indah Vitri Lestari; I Gede Hendrawan; Elok Faiqoh
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

The growth of the industrial sector in many countries which is relatively fast can increase emissions from greenhouse gases (GHGs) such as carbon dioxide (CO2) in the atmosphere. One of the aspects in reducing carbon gas is by maintaining forests and oceans to store carbon. One of the marine resources that is quite potential as storing CO2 gas is sea grass beds. Sea grass has a major role, namely as a carbon sink in the ocean or known as the Blue Carbon and is used for photosynthesis. The purpose of this study was to determine the carbon stocks in sea grasses at the top of the substrate (leaves), the bottom of the substrate (roots and rhizome) and on each type of sea grass obtained at Karang Sewu Beach. Determination of sampling points is as many as 6 stations and for sea grass sampling was carried out by purposive random sampling, referring to the density of sea grass which is assumed to represent or describe the condition of these waters. This research applied the dry ashing method that was carried out by crushing the sample components at 500?C. The results showed carbon deposits on the top of the substrate (leaves) of 0.01 tons, and on the bottom of the substrate (rhizomes and roots) of 0.02 tons. The yield of carbon stocks at the bottom of the substrate was higher than the top of the substrate due to the presence of organic matter, which is stored on the substrate into a carbon absorption factor at the bottom of the sea grass under the substrate.

Pengaruh Kerapatan Lamun Terhadap Kelimpahan Ikan Pada Padang Lamun Di Perairan Selatan Bali I Putu Irpan Aditanaya; Elok Faiqoh; I Gusti Bagus Sila Dharma
Journal of Marine Research and Technology Vol 3 No 1 (2020): FEBRUARI 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Seagrass had contributed for the life of fish, for instance as a feeding ground, spawning ground, nursery ground, and shelter. Seagrass had a positive correlation against a fish abundance, where diversity and fish abundance were found more associated with seagrass compared on an empty substrate. This research aimed to know the relationship of seagrass density and fish abundance which is important to maintain the long term sustainability of fish in Southern Bali. This research was carried out along Tanjung Benoa and done in four station points started from Tanjung Benoa Beach to Nusa Dua Beach which has characteristic white sandy beaches, big wave beach facing Indian Ocean. Data collection of seagrass used line transect method with 50 x 50 cm2 quadrant and fish sampling used the method of visual censuses in 50 x 5 meters. The analysis of the data used in this study included analysis of seagrass density, fish abundance, linear regression, and statistic test correlation. The results showed the condition of seagrass meadow conditions in Southern Bali that could be categorized very tight. The total range of fish abundance on a 0.18 0.28 – ind/m2 was 10 families of fish, they are Apogonidae, Nemipteridae, Pinguipedidae, Fistularidae, Cepolidae, Labridae, Diodontidae, Pomacentridae, Scorpaenidae, Chaetodontidae, and highest abundance of the family is Apogonidae. A dependent variable (fish abundance) were able to be explained by independent variable (seagrass density) and seagrass density could describe its effects on the fish abundance. The test results of the regression analysis between fish abundance and seagrass density also indicated weak correlation level between the two variables connected.

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