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All Journal Jurnal Ilmiah Elektronik Infrastruktur Teknik Sipil Jurnal Ilmiah Teknik Sipil Journal of Marine and Aquatic Sciences Omni-Akuatika Journal of Marine Research and Technology TRITON : Jurnal Manajemen Sumberdaya Perairan Ulil Albab

I Gusti Ngurah Putra Dirgayusa

Program Studi Ilmu Kelautan, Fakultas Kelautan Dan Perikanan, Universitas Udayana, Kabupaten Badung, Bali - Indonesia

Author-ID : 3755581

Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Social Sciences

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Struktur Komunitas dan Bioakumulasi Logam Berat Timbal (Pb) pada Teripang di Pantai Tanjung Benoa, Badung, Bali Kadek Widya Suryaningsih; I Gusti Ngurah Putra Dirgayusa; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 3 No 2 (2020): AGUSTUS 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2020.v03.i02.p08

High shipping activity in Tanjung Benoa beach has caused a strong possibility of heavy metal contamination to the marine ecosystems. Heavy metal in the water will process a deposition which causes an accumulation to the body of marine biotas especially to the filter feeders such as sea cucumber. This research aims to determine the community structure of sea cucumber and to calculate the bioaccumulation of lead (Pb) content in sea cucumber. Sampling activity was conducted at four sites located in Tanjung Benoa, Bali. At each site, a transect method was performed to assess the community structure of sea cucumber like density, diversity, and species composition. Meanwhile, the analysis of heavy metal was conducted by Atomic Absorption Spectrophotometer. In this research, we found 151 sea cucumbers which is come from five species such as Holothuria scabra, H. edulis, Synapta maculata, H. atra, H. leucospilota. The highest level of density was found in site one (0.0104 ind/m2) and the lowest was found in siten four (0.0034 ind/m2). The highest level diversity index was found in site three (0,37) and the lowest was in site two (0,14). The highest level of uniformity index was found in site three (0,21) and the lowest was in site two (0,01). The highest level of dominance index was found in site two (0,94) and the lowest was site three (0,85). The species composition was dominated by S. maculata which is represents 94.03% of the total species found in Tanjung Benoa. The number of bioaccumulation factor (BCF o-s) showed that the accumulation of Pb is categorized as deconcentrator category or low accumulation level since the number of the bioconcentration factor is less than one. While the number of bioconcentration factor (BCFo-w) is categorized as a low category since the number is less than 100. Therefore, it can be concluded that biota which categorized as a filter feeder such as sea cucumbers, can accumulate heavy metal (Pb) indeed with the low accumulation level

PERBANDINGAN LAJU PERTUMBUHAN RUMPUT LAUT (EUCHEUMA COTTONII) DENGAN MENGGUNAKAN SISTEM BUDIDAYA CO-CULTURE DAN MONOCULTURE DI PERAIRAN PANTAI GEGER, NUSA DUA, BALI Riris Christiani Gultom; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
Journal of Marine Research and Technology Vol 2 No 1 (2019): FEBRUARI 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Seaweed is a low level plant that can not be distinguished between the roots, stems and leaves so-called thallus. In seaweed cultivation process, seaweed farmers use monoculture system. But with the growing knowledge there is a more profitable system that is with the co-culture system. The co-culture system is a cultivation system that combines species from different trophic levels in the same system and considers environmental sustainability. The existence of co-culture system is believed to help fishermen in increasing income and overcome environmental problems due to the results of cultivation activities that are not utilized. This research was conducted for 42 days on May 2, 2018 - June 13, 2018 in the waters of Coast Geger, Nusa Dua, Bali. The method used is the RAL method (Completely Randomized Design) using three treatments and three replications. The monoculture cultivation system as a control and co-culture cultivation system with different density of abalone is 20 and 40 abalone consists of 10 seeds of seaweed with the same initial weight of 100 grams. The results showed that the highest seaweed-specific growth rate between the monoculture system and the co-culture system in cycles 1 and 2 was found in the co-culture system, whereas in cycle 3 the co-culture system experienced lower growth rate due to competition between thallus, the epiphytes attached to the cultivation net of co-culture, large enough current, and the loss of abalone that allegedly taken by the community around the coast. In this study there is also a tip of the thallus that is susceptible to ice-ice disease due to the presence of fish predators.

Struktur Komunitas Ikan Karang di Area Ponton Quick Silver, Perairan Toyapakeh, Nusa Penida Heru Wicaksono; Elok Faiqoh; I Gusti Ngurah Putra Dirgayusa
Journal of Marine Research and Technology Vol 4 No 1 (2021): FEBRUARI 2021
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2021.v04.i01.p04

The availability of coral reefs as habitat is closely related to the exsistence of coral fish resources in the waters. Coral fish resources are very important for tourism, as an object sought after by tourist because of their diverse and charming colors and shapes. Reef fish abundance depends on coral cover. This research was conducted in February 2020. The percentage of coral cover was collected using the Under Water Potography Transect (UPT) method and the visual census method for reef fish communities at five research stations located in the area of the Quick Silver’s pontoon, Toyapakeh, Nusa Penida with area of 20.000 . Based on the results, the diversity index in the first data collection ranged from 3.18-3.76, which means the diversity isin the high category. On the other hand, the diversity index in the second data collections tends to decrease in the range of 2.66-3.40, which means that the diversity is in the medium to high category. The uniformity index for the first and second data collection falls into the category of distressed communities. The dominances index on the two data found inj the low category. From this research, it was also found that the percentage of live coral cover in the area of use of the Quick Silver pontoon ranged from 0.08% to 17.32%, which means that all research stations were classified as bad. These results indicate that the presence of reef fish is not only caused by live corals but also by anthropogenic activities of the pontoon, such as manual feeding by visitors. This condition applies to reef fish with omnivore eating behavior, one of which is the Pomacentridae family of the major fish group. These anthropogenic activities can change the composition of reef fish communities and increase abundance.

Kandungan Bahan Organik di Sedimen Pada Budidaya Abalon Haliotis squamata dengan Sistem Co-Culture di Pantai Geger Bali Ika Arofa Setiawati; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
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

Marine cultivation is increasing to meet market demand. One of Indonesia's aquaculture commodities is abalone (Haliotis squamata). Improvement of marine cultivation business should pay attention to the impact on the environment. Marine cultivation one of system that considers environmental sustainability is IMTA (Integrated Multi Trophic Aquaculture). The cultivation business gives effect to the water and sediment quality at the cultivation. The purpose of this research is to know whether there is difference of sediment organic matter in cultivation of abalon Haliotis squamata between before and after IMTA system. This research was conducted for 45days at Geger Beach, Badung regency, Bali. The method used in this research is Loss-on-ignition method. The results were analyzed by T-test using SPSS. The results of this research showed that the sediment organic matter before the cultivation process in the sediment was 29,1622% and after 45 days the cultivation process took place with an organic matter content of 31,0052%. The results of statistical analysis of the T-Test that sediment organic matter between before and after 45 days of cultivation process had no significant difference (P> 0.05).

Konsentrasi Logam Berat Timbal (Pb), dan Kadmium (Cd) pada Telur Penyu Lekang (Lepidochelys Olivacea) di Pulau Serangan, Bali Carolina Asrin; I Gusti Ngurah Putra Dirgayusa; Elok Faiqoh
Journal of Marine Research and Technology Vol 3 No 2 (2020): AGUSTUS 2020
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2020.v03.i02.p05

Sea turtles is one of the marine megafauna which has categorized as protected animal. They are able to migrate long distance along the Indian Ocean, Pacific Ocean and Atlantic Ocean. Heavy metals may enter to marine organism bodies through three ways including, food ingestion, gills, and surface diffusion of the skin. Accumulation of heavy metals in the body for a long time may disrupt the circulatory system, nerves and kidney work. The effort to increase the hatching success is very important for the turtle conservation. Therefore, this study was aims to examined the concentration of heavy metals detected in the eggs of olive ridley (Lepidochelys olivacea) turtle.This study was conducted between July - September 2019 in Serangan Island. The method used in this study was a purposive random sampling, determined by four olive ridley’s nests in their nesting period with each nest of 5 egg samples. The heavy metal contents were analyzed with Atomic Absorption Spectrophotometer. The results showed that Pb concentrations ranged from 5.50-103.66 mg/kg with an average of 36.49 mg/kg, while Cd concentrations ranged from 0.07-16.25 mg/kg with an average of 0.96 mg/kg. The concentrations of heavy metals in sea turtle eggs may come from their parent, which might be already accumulated heavy metals in their tissues. This might occur due to the substances in the eggshell are capable to absorb heavy metals. The results of this study highlight the average concentration of heavy metals in L. olivacea eggs exceeded the threshold of heavy metals for egg products set by the Indonesian Regulation of the Food and Drug Control Agency (BPOM) No. 5 of 2018. This indicates that the eggs of Olive ridley sea turtle in the region are unsafe for human consumption. In addition sea turtle eggs are in high risk for human consumption because they contain heavy metals. All types of turtle products are also protected by UU No. 5 of 1990, therefore the culture of the community in consuming and trading turtle products must be stopped.

Laju Penjalaran Rhizoma Lamun Thalassia hemprichii, Cymodocea rotundata, Halophila ovalis, dan Halodule uninervis yang Ditransplantasi Di Serangan Utara, Bali Kadek Weda Ari Bhawana; Elok Faiqoh; I Gusti Ngurah Putra Dirgayusa
Journal of Marine Research and Technology Vol 2 No 1 (2019): FEBRUARI 2019
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Seagrass is also one of the carbon sinks at sea, and as a catcher of sediments that go to sea so seagrass can be used as a balancer of all marine ecosystems. In the seagrass ecosystem, associate various types of marine biota of significant value with a very high level of diversity. Seagrass is affected by environmental conditions and human activities. Serangan island from the 70s already existing tourism that developed there such as Turtle Waching and Dugong Waching. Dugong (Dugong dugon), a plant-eating mammal or herbivore mammal, the main food is seagrass. the existence of a reclamation project on Serangan Island caused many habitats and marine biota around Serangan Island waters to be damaged and lost, especially seagrass plants. This research to determine the seagrass survival rate if transplanted in the North Serangan waters region and to determine the growth rate of Rhizoma seagrass with Species Thallasia hemprichii , Cymodocea rotundata, Halodule ununervis, and Halophila ovalis transplanted in the waters of North Serangan. This research was conducted in the month of February - April 2018. The research consisted of two stations with one station in a dense region of human activity and the station 2 without any human activity. Seagrass transplantation is done by using frame made of iron with size 1x1 meter. The results showed that at station 1 the level of seagrass survival was lower than station 2, it was caused by the dense human activity at station 1. So was the rate of growth at station 1 lower than station 2. This could also be due to the water quality which is lower at station 1.

Profil Indeks Kesesuaian Wisata di Pantai Semawang, Kelurahan Sanur, Denpasar Berbasis Zonasi Pemanfaatan Kawasan Ida Bagus Putu Adi Gita Saputra; I Gusti Ngurah Putra Dirgayusa; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 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.i01.p05

The tourism suitability index (IKW) research conducted at Semawang Beach, Sanur Village, Denpasar, aimed to determine the limiting factors, the value of the tourism suitability index, and the zone of the utilization of the coastal tourism area for the recreation category. The method used is observation and survey in the field by purposive sampling at 4 station points, divided into a beach length of 710 m, and tourist interviews with as many as 50 respondents. The data include beach type, water depth, beach width, water base material, water current velocity, coastal slope, water clarity, coastal land cover, hazardous biota, and freshwater availability. The analysis of the tourism suitability index (IKW) refers to the tourism suitability matrix and the classification of the suitability of beach tourism in the recreation category. The limiting factor of the tourism suitability in Semawang Beach is the closure of coastal land. The value of the tourism suitability index (IKW) for beach tourism activities in the recreational category at Semawang Beach at the station I was 96.43%, station II was 90.48%, station III was 96.43%, and station IV was 94.04%. All stations are categorized as suitable (SS) for beach tourism activities. The used zone for coastal tourism areas for swimming, sunbathing, sports, and sightseeing can be carried out at all stations. The sacred zone is at Station II, adjacent to the entrance to the beach

Pemodelan Kekuatan Gelombang di Pesisir Barat Kecamatan Kuta, Bali Timothy Kenoly; I Gede Hendrawan; I Gusti Ngurah Putra Dirgayusa
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 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.i01.p06

The coastal area is an important area with many different functions for both human and marine organisms. Still, coastal regions are vulnerable to changes caused by various things, including waves. Waves can cause shoreline changes and erode coastal regions. Kuta District is one of the coastal areas on the island of Bali that are threatened with constant sediment erosion every year. One way to increase understanding of the wave and its effect on the coastal areas is through numerical modeling. This study aimed to determine the pattern of wave and wave strength distribution on the west coast of the Kuta district. The Finite Volume Coastal Ocean Model and SWAVE (FVCOM-SWAVE) coupling model that was used in this study utilized the Finite Volume method of computation with the unstructured triangular grid. The results showed that in West Season (December-January-February), the range of mean significant wave heights on the west coast of Kuta District is 0.05 - 0.2 m, and the wave power ranged from 1 to 30 W/m with the most considerable value of significant wave heights and wave power were encountered in January. Water areas near land have greater wave heights and wave power than areas far from land, except around Ngurah Rai International Airport. The movement of waves primarily comes from the southwest, the Bali Strait, to the east and is divided by the runway into following the northern and southern parts of the coast. Thus, the most significant wave height ??and wave power values are found in the waters near Kuta beach and Legian beach.

Indeks Kesesuaian Wisata Di Pantai Pemuteran Buleleng, Bali I Kadek Aldi Wahyu Andika Maha Putra; I Gusti Ngurah Putra Dirgayusa; I Gusti Bagus Sila Dharma
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.p04

Marine ecotourism is one way of developing tourism in coastal areas that pays attention to ecology and maintains environmental stability. This study was conducted to determine the value of the Tourism Suitability Index (IKW) at Pemuteran Beach, Grokgak, Buleleng by considering 10 parameters such as water depth, beach type, beach width, water base material, water current velocity, beach slope, water brightness, coastal land cover, hazardous biota, and freshwater availability. The method of determining the location using the purposive sampling method is by taking an intentional and determined sample so that what you want to study can be represented by the number of stations, as many as 4 station points. The IKW analysis in this study refers to the suitability classification of coastal tourism and the tourism suitability matrix. Based on the results of the IKW analysis at Pemuteran Beach, each station, namely Station I has a value of 77%, station II is 79%, station III is 83%, and Station IV is 82%. It has the type and basic material of the beach with a black sand substrate with a mixture of coral fragments with a depth of 1.55-1.7 m; including shallow waters, the average width of the beach is quite wide, which is 11.5 m. In addition to this, Pemuteran Beach has a coastal slope of less than 10o with an average current speed of 0.27 m/s and has 100% water clarity. Coastal land cover is generally in the form of resident settlements.

Aplikasi Penginderaan Jauh Citra Landsat-8 Untuk Pembuatan Peta Batimetri Di Perairan Pantai Jumpai, Klungkung, Bali Ida Ayu Made Inten Melinia; I Dewa Nyoman Nurweda; I Gusti Ngurah Putra Dirgayusa
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.p09

Klungkung Regency is the smallest regency in the province of Bali, Indonesia. The waters of Jumpai Beach are one of the areas in Klungkung, which is one area that is used by the surrounding population for fishing activities for fishermen to obtain fishery products. Remote sensing technology has been applied because of its effectiveness and the significance of its use in compiling and revising resource maps. It is also helpful to support resource planning and management. A bathymetry map is a map that describes the depth of the sea and is presented using contour lines. Contour lines are abstract lines connecting several locations or areas with the same height or depth. Remote sensing techniques are available to determine the oceanâ€™s depth because the air has signals from the very bottom of the ocean with strong solid wavelengths. However, the penetration of electromagnetic energy is limited. Therefore, remote sensing techniques are adopted to infer water depth and shallowness. One of the satellites that can be used for bathymetry mapping is Landsat-8. Landsat imagery has a spatial resolution of 30 meters, complemented by the visible channels required to extract bathymetric maps. Accurate estimation of shallow water area bathymetry for the safety of small boat navigation such as fishing and for benthic studies. Remote sensing technology can be considered one of the most desirable alternative tools for bathymetry development.

Co-Authors AAK Aswan Deva Abd. Rahman As-syakur Andreas Pratama Togatorop Basyaasyah Rahmaningrum Pettalolo Br Sitepu, Fany Ekaristy Carolina Asrin Desy Shintya Irene Dwi Budi Wiyanto Elok Faiqoh Febriyanto Arifin Gede Surya Indrawan Heny Hayati Heru Wicaksono I Dewa Nym. Nurweda P., I Dewa Nyoman Nurweda I Gede Hendrawan I Gede Surya Indrawan I Gusti Ayu Dian Indraswari I Gusti Ayu Ricca Mahatma Putri I Gusti Bagus Sila Dharma I Gusti Bagus Sila Dharma I Kadek Aldi Wahyu Andika Maha Putra I Ketut Budiarta I Ketut Wija Negara I Komang Subandi I Made Raditya Putra I Made Rai Januatmika I Made Satya Prayoga I Made Subali Arta Arta I Pande Made Lanang Kertadana I Putu Aditya Budi Wacika I Putu Oka Saduarsa I Wayan Artadana I Wayan Nuarsa Ida Ayu Made Inten Melinia Ida Bagus Ketut Ravidhya Krisna Sekar Ida Bagus Putu Adi Gita Saputra Ika Arofa Setiawati Jenisia Barros Soares Jesikapna Callia Br Guru Singa Kadek Weda Ari Bhawana Kadek Widya Suryaningsih Muhammad Fakhri Ramadhani Ngakan Putu Purnaditya Ni Kadek Apriantari Ni Luh Putu Ria Puspitha Ni Luh Putu Ria Puspitha Ni Nyoman Desi Kusuma Dewi Ni Nyoman Pujianiki Ni Wayan Loviasari Nur Asni Puspita Sari Pande Chrisna Aryasuta Puspitha, Ni Luh Putu Ria Putra, I Nyoman Giri Putu Adi Prawira Riris Christiani Gultom Rizky Ramadhan Siahaan, Jonathan M Timothy Kenoly Trisilia Mulyawati Anggraeni Wattimena, Adolf Krisna Mahendra Widiastuti Karim Widiastuti Widiastuti Yulianto Suteja

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