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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 91 Documents

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KONDISI STOMATA DAN MORFOLOGI DAUN Rhizophora apiculata PADA KAWASAN INDUSTRI PERMINYAKAN DAN NON KAWASAN INDUSTRI DI PROVINSI RIAU Syahrial Rial
Journal of Marine Research and Technology Vol 1 No 1 (2018): AGUSTUS 2018
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Oil spills often occur in the sea and are fatal to the mangrove ecosystems that exist on the coast. One of the effects is the occurrence of defoliation or leaf fall, where mangrove leaves yellowish, then wither and fall to the substrate. The study of stomatal and morphological conditions of Rhizophora apiculata leaves in petroleum industrial estate and the non-industrial area in Riau Province has been conducted in November – December 2014 with the aim to know the impact of oil industry development on stomata density, stomata area, and leaf surface area. Leaf samples were taken from 4 (four) different areas, namely Crude Palm Oil (CPO) oil industry, petroleum industry area, the joint industrial zone between petroleum and CPO and no area at all of its industrial estate. The leaf sampling was carried out using a line transect drawn from the reference point (the outer mangrove stand) with the direction perpendicular to the coastline to the mainland and made sample plots according to the level of the stand. Then each strand of the selected population, each taken 3 leaves and preserved with 70% alcohol. The results showed that in the oil industry, stomatal density, stomata area, and leaf area is higher when compared with non-industrial areas. Then the relationship of stomatal density with salinity, pH and redox shows that the higher the parameter, the higher the density of the stomata. So is the relationship between stomata area with pH and redox, the higher the parameter, the higher the stomata area. Keywords: leaf morphology, Rhizophora apiculata, petroleum industry, non-industrial area mangrove, Riau Province

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.

DISTRIBUSI SPASIAL GASTROPODA Littoraria scabra DI HUTAN MANGROVE PULAU TUNDA SERANG BANTEN, INDONESIA Syahrial Rial; Nanang Karsim
Journal of Marine Research and Technology Vol 1 No 1 (2018): AGUSTUS 2018
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Gastropods is the most dominant molusc group in the mangrove forest. The Spatial Distribution Study of Gastropoda Littoraria scabra in the Mangrove Forest of Serang Banten Island has been conducted in January 2014. It aims to provide information on the spread of Indonesian biodiversity especially L. scabra. Data collection of L. scabra gastropods is done by making line transects and plots drawn from the reference point (the outer mangrove stand) and perpendicular to the coastline to the mainland. The line transect is made of plots with size 10 X 10 m and in the size of 10 x 10 m, a small plot of 1 x 1 m of 5 plots is created. The results showed that L. scabra gastropod was distributed evenly in the mangrove forest of Pulau Tunda Serang Banten. Then the composition and density are higher in the East (284 individu and 6.31 ind/m2) than in the South (101 individu and 2.24 ind/m2). In addition, the results also showed that the distribution pattern of L. scabra gastropod in the mangrove forest of Tunda Serang Banten Island was uniform (I? <1), indicated that L. scabra gastropod disperse evenly in it’s mangrove forest. Keywords: distribution, gastropod, Littoraria scabra, mangrove, Tunda Island, Indonesia

EFEK PEMBERIAN JENIS PAKAN YANG BERBEDA TERHADAP PERTUMBUHAN ABALON (Haliotis squamata) DI PANTAI GEGER, DESA PEMINGE, BALI Cindi Ayu Lestari; I Wayan Gede Astawa Karang; 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

Abalon is one of the marine commodities that have high economic value to foreign countries. The abandoning market demand for abalons causes a decline in abalone populations in nature due to exploitation. To meet market needs without affecting the abalone population in nature, cultivation is carried out. Success in the cultivation of abalone one of them is determined by the control of feed. This study aims to determine the effect of different types of feed on the growth of Haliotis squamata abalone. Types of food that can be used as abalone foods are Euchema cottonii and Gracilaria sp. with a feeding percentage of 20% of the abalone weight. This study was conducted for 45 days at Geger Beach, Nusa Dua, Bali using a completely randomized design method consisting of three treatments and three replications. The results showed that the highest value of the specific growth rate was in the T3 treatment using Gracilaria sp. the value is 0.25%, then followed by T1 treatment which uses Euchema cottonii feed with a value of 0.07%, while the lowest is in T2 treatment using combination feed Euchema cottonii and Gracilaria sp. whose value is 0.01%. The highest survival rate in T3 treatment using Gracilaria sp. value was 68%, followed by niali on T2 treatment using combination feed Euchema cottonii and Gracilaria sp. that is 58%, and the lowest in T1 treatment using Euchema cottonii feed the value is 43%. Water quality parameters including temperature, salinity, DO, pH, nitrate flow velocity, and phosphate do not reach the quality standards for biota.

Pemodelan Distribusi Nitrat di Kawasan Perairan Teluk Benoa I Made Dharma Raharja; I Gede Hendrawan; Yulianto Suteja
Journal of Marine Research and Technology Vol 1 No 1 (2018): AGUSTUS 2018
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Benoa Bay is a highly regarded area by environmental conditions. Nitrate is important parameter for marine biota life. From previous research on nitrate contamination in Benoa Bay, the nitrate concentration has reached the standard condition of Bali Governor Regulation No. 16 of 2016 on Environmental Living Standard Quality and Living Standard Damage of 0,008 mg/L. Analysis previous researc still limited for surface water, so it is important to do more reasearch in water cloum of Benoa Bay. Research for nitrat constration can do whith observation data but the data observation need long time and many money. In this study using numerical modeling. The numerical modeler in this study is Finite Volume Coastal Ocean Model (FVCOM) which is modeled in 3-D. In the analysis of nitrate distribution in this study used the moemntum equations and advection-diffusion equations. From the model results for each condition the nitrate concentration at the surface of the Bay of Benoa is high in the western part of Benoa Bay and east of Benoa Bay. While in the water column of Benoa Bay the nitrate concentration tends to be influenced by the tidal elevation. The concentration nitrate is high in the low tide and the consectration nitrate is low in the high tide. The nitrate concentration from the surface to the bottom of the water have similar consentration.

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.

Estimasi Persentase Karbon Organik pada Tanah di Hutan Mangrove Alami, Perancak, Jembrana, Bali IGA Ayu Mirah Indraiswari; I Dewa Nyoman Nurweda Putra
Journal of Marine Research and Technology Vol 1 No 1 (2018): AGUSTUS 2018
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Mangrove is one of the coastal ecosystems that play a role in taking and storing a number of carbon known as Coastal Blue Carbon. Soil storage (below-ground) in mangrove forests has a potential potential of 50% to 90% more than the total carbon stock of the ecosystem. This study was conducted at 3 stations in Perancak Mangrove Forest, Jembrana, Bali with the aim of estimating the percentage of organic carbon and knowing the vertical variation percentage of organic carbon in the soil. Sampling time was conducted in June 2015. The data required to calculate the percentage of organic carbon in the soil is the depth of soil samples, depth and sub-sample intervals, and bulk density. From the results of the study found that the percentage of organic carbon in the soil in the natural mangrove forest Perancak by 50.235% or 185.968 Mg / ha. Vertically the percentage of organic carbon in soils in natural mangrove forests Perancak varies. The lowest bulk density value at depth (0-15 cm) of 0.07 g / cm3 at station 1 and highest at depth (> 100 cm) of 0.20 g / cm 3 at station 3; value of the lowest organic carbon% at depth (> 100 cm) of 47.899% at station 2 and highest at depth (50-100 cm) of 51.821% at station 1; the lowest soil C value at depth (0-15 cm) is 17,361 Mg ha-1 and the highest at depth (50-100 cm) is 62,962 Mg ha-1 at station 1.

Identifikasi dan Kelimpahan Bakteri Enterococcus spp. pada Mucus Karang di Perairan Pemuteran, Bali Dewa Ayu Mira Prabaswari; I Dewa Nyoman Nurweda Putra; Widiastuti Karim
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

Letak geografis Indonesia di area segitiga karang dunia menyebabkan tingginya jumlah jenis karang keras. Terumbu karang memiliki berbagai fungsi yaitu sebagai habitat berbagai biota laut seperti tempat pemijahan dan pelindung alamiah dari bahaya abrasi. Pencemaran domestik memiliki kontribusi yang relatif besar terhadap kerusakan terumbu karang. Aktivitas manusia dan aliran sungai membawa partikulat dari daratan berupa sedimen ataupun bahan organik yang masuk kedalam laut sehingga dapat mengakibatkan terjadinya pencemaran limbah domestik. Bakteri Enterococcus spp. adalah bakteri yang ditemukan pada limbah domestik yang dijadikan indikator pencemaran limbah domestik. Metode pengambilan sampel mucus karang dilakukan dengan metode purposive sampling, dimana penentuan ini berdasarkan keberadaan terumbu karang dan kondisi pesisir yang berbeda-beda. Pengambilan sampel mucus karang di setiap stasiun yaitu dengan memilih secara acak 3 genus karang dalam masing-masing 3 ulangan transek sabuk 20 x 2 m. Sampel mucus karang sebanyak 10 ml akan diinokulasi pada media selektif Slanetz and Bartley. Keberadaan bakteri Enterococcus spp. yang tumbuh pada media ditunjukkan dengan koloni yang tumbuh berwarna merah. Identifikasi bakteri dianalisis menggunakan analisis deskriptif, sedangkan kelimpahan bakteri dianalisis dengan Anova satu arah untuk mengetahui perbedaan kelimpahan bakteri di setiap stasiun. Hasil penelitian ini adalah bakteri Enterococcus spp. teridentifikasi di semua stasiun pengambilan sampel mucus karang yang ditandai dengan pertumbuhan koloni bakteri berwarna merah pada media selektif dan tidak terdapat perbedaan kelimpahan bakteri Enterococcus spp. antar genus karang yang berbeda di setiap stasiun pengambilan sampel yang menunjukkan pencemaran domestik tersebar merata pada semua jenis karang.

Preferensi Preferensi Pemangsaan Drupella sp. pada Jenis Karang yang Berbeda di Perairan Pemuteran, Bali Ni Wayan Gita Kanela; IGN Putra Dirgayusa; Widiastuti Karim
Journal of Marine Research and Technology Vol 1 No 1 (2018): AGUSTUS 2018
Publisher : Department of Marine Sciences, Faculty of Marine Science and Fisheries, Udayana University

Coral reefs are experiencing dynamic changes over time that are strongly influenced by environmental conditions and human activities. One of the natural damage to coral reefs is corallivorous gastropods such as Drupella sp. The marine tourism of Pemuteran waters on northern part of Bali is rapidly developing. However the Bio-Rock Center reported that there were 2.374 individuals of Drupella sp. found during 2008-2009 in this water. Therefore, this study aimed to determine the densities of Drupella sp. and prey preferences of Drupella sp. on coral species in Pemuteran waters. There were 4 observation sites that parallel to the shoreline at similar depths (5-6 m). The densities of Drupella sp. and prey preference were measured 2 x 20 m belt transect by using SCUBA. Live coral covers were counted in LIT (Line Intercept Transect) method. The significant difference of Drupella sp. densities among sites was analysed by using one way ANOVA, while the prey preference among corals species was identified by using Bonferroni test. The result showed that the highest abundance of Drupella sp. found at station 1 and the lowest at station 2. It is suggested that related to percentage of live coral cover as the highest was at station 1 and the lowest was at station 2.Studies revealed that Drupella sp. prey particulary on living coral. Furthermore, our observations indicated that Drupella sp. more attracted to coral Porites and Pocillopora. This prey preferences are thought to be due to the highest abundance of these corals at all study sites.

Diversitas Makrozoobentos di Kawasan Ekosistem Mangrove Berdasarkan Perbedaan Substrat Desa Pejarakan, Kecamatan Gerokgak, Buleleng Ratih Permitha Syury; IGB Sila Dharma; Elok Faiqoh
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

Kawasan ekosistem mangrove Desa Pejarakan merupakan kawasan yang sedang diusulkan sebagai kawasan konservasi oleh kelompok masyarakat NCF Putri Menjangan, Kecamatan Gerokgak. Hal ini membuat diversitas biota laut salah satunya makrozoobentos dapat berkembang biak dengan baik. Selain itu, adanya vegetasi mangrove dan perbedaan substrat juga mempengaruhi diversitas makrozoobentos. Pada penelitian ini digunakan metode purpossive sampling untuk menentukan lokasi pengambilan sampel mangrove yang diasumsikan dengan adanya perbedaan substrat di setiap stasiunnya seluas 10 x 10 M, dalam transek tersebut dilakukan pengambilan sampel makrozoobentos dengan transek 1 X 1 m. Perbedaan substrat ini mempengaruhi nilai diversitas yang didapatkan, pada nilai komposisi jenis yang didapatkan untuk vegetasi mangrove tertinggi terdapat di stasiun 3 pada genus Sonneratia sebesar 62%. Sedangkan untuk nilai kepadatan dan diversitas mangrove tertinggi terdapat di stasiun 2 dengan nilai kepadatan 0,09 ind/m2 dan nilai diversitas sebesar 0,937. Lain halnya dengan nilai kepadatan dan diversitas tertinggi untuk makrozoobentos terjadi pada stasiun 1 dengan nilai kepadatan makrozoobentos sebesar 25,50 ind/m2, sedangkan untuk nilai diversitas makrozoobentos sebesar 2,865. Oleh karena itu, kategori diversitas untuk mangrove termasuk kategori diversitas rendah berbanding terbalik dengan keseluruhan nilai diversitas makrozoobentos yang termasuk dalam berbagai kategori diversitas sedang. Oleh karena itu, kondisi ini diasumsikan bahwa dengan adanya perbedaan substrat yang terjadi pada stasiun 1 berupa pasir berlempung, stasiun 2 berupa lempung berdebu dan stasiun 3 berupa lempung ini, dapat mempengaruhi perbedaan jenis yang terdapat di setiap stasiun. Hal ini dikarenakanan setiap makrozoobentos memiliki toleransi hidupnya masing-masing untuk menyesuaikan diri dengan habitatnya.

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