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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.
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Articles 17 Documents
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Search results for , issue "Vol 7 No 2 (2021)" : 17 Documents clear
Analisis Karakter Morfometrik Ikan Tongkol (Auxis sp) Yang Didaratkan Di Pantai Tianyar, Karangasem Abdi Jana Guna; Ni Luh Watiniasih; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p01

Abstract

Mackerel tuna is favored by many people, with high consumer need at the market, can have an impact not selectively the size of tuna catch. The problem of the size of tuna catch can be known by morphometric research. The research about morphometric mackerel tuna was done at Tianyar Beach, Karangasem, there are two types of mackerel tuna it called is bullet tuna (Auxis rochei) and frigate tuna (Auxis thazard). The difference between bullet tuna and frigate tuna is body shape, body marked, body color. Morphometric characters of bullet tuna and frigate tuna as total length (TL), standard length (PS), fork length (PC), head length (PK), head height (TK), predorsal length (PPD), prepectoral length (PPP), eye diameter (DM), operculum length (PO), maxillary length (PRA), lower jaw length (PRB), height (TB), length of the lower caudal fin (PSEB), length of the upper caudal fin (PSEA) an increase during 30 trips (February - April), the increase in morphometric size of bullet tuna and frigate tuna from Februari until April related by animal growth and evolve. Fork length frequency distribution bullet tuna has a range between 216 – 278 mm, and fork length frequency distribution of frigate tuna has a range between 230 – 299 mm. Length - weight relationship of bullet tuna is W = 0,00002 and frigate tuna is W = 0,00006 , they have the similarity about length growth faster more than weight (allometrik negative). Composition of bullet tuna is 508 and 46 individual of frigate tuna in Tianyar Beach, Karangasem during 30 trip.
Pengaruh Suhu Permukaan Laut terhadap Curah Hujan di Pulau Bali Tahun 2009-2018 Ida Bagus Agung Parahita Adiguna; I Wayan Nuarsa; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p10

Abstract

Change in sea surface temperature (SST) has a huge impact to rainfall intensity. This research analysed the trend of SST all over Bali island for 10 years (from 2009 to 2018) using MODIS satellite level 3, covered 7.8958oSouth -8.8958oSouth and 114.4791oEast - 115.6875oEast. The data for rainfall trend was collected from 12 rain observer stations of BMKG (Indonesian Meteorological, Climatological, and Geophhysical Agency). The statistical correlation between SST and rainfall intensity were analyzed using Microsoft Excel software. The result found that the SST in Bali ranged from 25.4oC until 31.5oC. The change of SST has a similar pattern to the monsoon cycle where the western monsoon is relatively warmer than the eastern monsoon. The rainfall trend in Bali is closely related to the monsoon cycle. During the western monsoon,the average monthly rainfall value in Bali is more than 150 mm, while the rainfall value on the eastern monsoon is slightly different, which is <150 mm. The correlation between SST and rainfall is influenced by the monsoon direction.The correlation between SST and rainfall in the west and transitional season Iis weak with a coefficient correlation value of -0,46 at lag 0, whereas in the east and transitional season II showed a strong correlation coefficient value of 0.94 in lag 0 (in the same month).
Potensi Harmful Algae Bloom (HAB) di Keramba Jaring Apung Perairan Desa Sumberkima Kecamatan Gerokgak, Kabupaten Buleleng Ni Luh Kade Paramita Kusuma; I Wayan Gede Astawa Karang; I Gusti Bagus Sila Dharma
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p15

Abstract

Sumberkima Village is one of the villages in Gerokgak sub-district that has the most floating net cage cultivation in Buleleng regency. The development of fish farming activities with floating net cage techniques had an impact on the waters. The leftover feed that is not consumed, and the metabolic wastes produced by aquaculture increased the fertility of the waters so that it is feared that phytoplankton are potentially causing the Harmful Algae Bloom (HAB) phenomenon in the floating net cage aquaculture area of Sumberkima village which can have an impact on water quality, aquatic biota and cultivator’s income. This study aimed to identify the genus phytoplankton that has the potential to cause Harmful Algae Bloom (HAB) and the abundance of phytoplankton that has the potential to cause the Harmful Algae Bloom (HAB) phenomenon. This research was conducted in February 2019 at the floating net cage in Sumberkima village, Gerokgak sub-district, Buleleng regency. The study was spread over 10 points of floating net cages determined by purposive random sampling to represent floating net cages in Sumberkima village. Data were analyzed descriptively with phytoplankton abundance calculation using APHA (2005) method. From the research that has been done, it was found that the type of phytoplankton suspected to have HAB potential was found in 2 class groups namely Dinophyceae with a percentage of 15% consisting of: Prorocentrum, Dinophysis, Alexandrium and Peridinium then Bacillariophyceae with a percentage of 85% as many as 7 genera include: Thalassiosira, Pseudonitzschia, Biddulphia, Nitzschia, Skeletonema, Chaetoceros and Ceratium.
Komposisi Jenis dan Keanekaragaman Ikan Karang pada 3 Jenis Bahan Terumbu Karang Buatan (Artificial reef) yang Berbeda (Beton, Ban Bekas, dan Besi) di Teluk Jemeluk Amed, Karangasem, Bali Ida Bagus Indra Danendra; I Gusti Bagus Sila Dharma; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p05

Abstract

Artificial reef at Jemeluk Bay, Karangasem, Bali is one of the area’s fisheries potential. Artificial reef is an underwater structure that is made for fishes’ protection and feeding ground. The purpose of this research is to know and understand types of reef fishes that surround the artificial reef, as well as the artificial reef’s affect onto the fish’s abundance at Jemeluk Bay. The method used for reef fish monitoring by visual census at artificial reef made from concrete, rubber tire and steel. This research is done towards six coral reef structures to get the reef fishes composition, which is made out of 7 fish families, 17 species, with an abundance total of 708 individuals. The highest fish abundance was founded at the 2nd rubber tire artificial reef with 6,4 individuals/m2, and the lowest fish abundance was found at the 1st concrete artificial reef with 3,28 individuals/m2. From the calculation at six of the artificial reef structures, the diversity index varies between 1,2 – 1,57, which is categorized as low diversity. The diversity value shows that steel artificial reef have the highest fish species diversity, however is still categorized as low.
Struktur Komunitas Makrozoobenthos di Ekosistem Mangrove Pulau Serangan Bali I Ketut Dedi Ariawan; I Gusti Bagus Sila Dharma; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p11

Abstract

Macrozoobentos are organisms that live at the base of the water (Epifauna) or in the substrate (Infauna) with a size greater than 1 mm. Macrozoobenthos play an important role in the process of decomposition of organic matter in the sediment in the mangrove ecosystem. This research was conducted in August 2018 in the mangrove areas of Serangan Island, Bali. This research has purpose to know the structure of the Macrozoobenthos community in the mangrove ecosystem. It using a purposive sampling method, which consists of 2 stations, located in the north (adjacent TPA Suwung) as station 1 and on the south (directly facing the sea) as station 2. Each station consists of 5 substations with the distance between the substations adjusted to the condition of the existing mangrove community and each substation has 3 plots with a distance between the plot 10 m. The transect is drawn towards the sea for 50 m. The results obtained at station 2 had higher abundance of macrozoobenthos than Station 1, his shows the condition of the substrate at station 2 it supportive for the survival of macrozoobenthos organisms. The difference in the substrate in each station is thought to be one of the factors that influence the difference in macrozoobenthos density. At stations 1 and 2 have medium diversity, high Eveness and low dominance. This shows that the macrozoobenthos community in the mangrove ecosystem in the north and south of Serangan Island is in a stable condition but if the environment experiences a change, the change will affect the structure of the macrozoobenthos community in the ecosystem environment so that the value of species diversity is at a medium level.
Skrining Fitokimia dan Uji Toksisitas Ekstrak Daun Lamun Halophila Ovalis di Perairan Pantai Karma dan Pantai Serangan, Bali Rizky Ramadhan; I Gusti Ngurah Putra Dirgayusa; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p02

Abstract

Lamun diketahui memproduksi senyawa aktif berupa senyawa metabolit sekunder yang berperan dalam sesi pertahanan hidup baik dari serangan predator maupun kondisi lingkungan ekstrim. Kandungan bahan aktif ekstrak lamun diketahui berpotensi sebagai antikanker dan antifungi. Oleh karena itu penelitian ini bertujuan untuk mengetahui kandungan senyawa aktif dan perbedaan tingkat toksisitas dalam ekstrak lamun Halophila Ovalis di perairan Pantai Karma dan Pantai Serangan. Metode uji toksisitas yang digunakan adalah Brine Shrimp Letal Test (BSLT) dengan menggunakan Arthemia salina sebagai hewan uji. Hasil uji fitokimia yang dilakukan menunjukkan ekstrak daun lamun Halophila Ovalis di Pantai Karma mengandung senyawa bioaktif jenis alkaloid dan tanin, sedangkan ekstrak daun lamun Halophila Ovalis di Pantai Serangan mengandung senyawa bioaktif dari jenis alkaloid, tanin dan triterpenoid. Uji toksisitas dengan metode BSLT yang dilakukan menunjukkan ekstrak daun lamun Halophila Ovalis di Pantai Karma dan Pantai Serangan bersifat tidak toksik, dimana nilai LC50 ekstrak daun Halophila Ovalis pada konsentrasi terendah sampai tertinggi yaitu, (10, 100, dan 1000 ug/ml) tidak memberikan efek kematian 50% terhadap telur Arthemia salina.
Monitoring Perubahan Penggunaan Lahan Pesisir di Kabupaten Gianyar Menggunakan Citra Landsat 1997 dan 2018 Kadek Ayun Wardimas; I Wayan Nuarsa; I Dewa Nyoman Nurweda Putra
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p16

Abstract

The sustainable development process followed by high population growth is an important factor causing land conversion in coastal areas. Analysis of change and planning of land use is one form of coastal resource management to reduce land damage so that it can be used sustainably. This study aims to determine the types and changes in land use over 21-year period (1998-2018) in the coastal area of Gianyar Regency. This study also wants to examine the level of accuracy of Landsat imagery in land use classifications. The Landsat imagery used in this study was Landsat 7 ETM+ in 1998 and Landsat 8 Oli in 2018. The classification method chosen was the supervised classification with the Maximum Likelihood method. The software used is SAGA GIS to process images and QGIS to design map layouts. The results showed that the land use classes in the study area were water, bare land, settlements and buildings, shrubs/bushes, rice fields, moor and mixed gardens. In the period 1998-2018, four classes experienced declined in area, namely water (1.71 ha), bare land (54.99 ha), mixed gardens (28.08 ha), and rice fields (226.62 ha). Meanwhile, land use classes that have increased in area are shrubs/bushes (44.28 ha), moor (104.58 ha), and settlements and buildings (162.54 ha). The overall level of accuracy in land use classification is 85%.
Pemetaan Habitat Dasar Perairan Dangkal Menggunakan Citra Satelit SPOT-7 di Pulau Nusa Lembongan, Bali I Dewa Made Krisna Putra Astaman; I Wayan Gede Astawa Karang; I Gede Hendrawan; Kuncoro Teguh Setiawan
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p07

Abstract

Shallow water habitat is one of the regions that has high dynamics and has an important role are ecologically and economically. The high dynamics of the ideal shallow water habitat is always followed by updating information so that an overview of the area is obtained in accordance with reality. Remote sensing technology is one of the technologies that can be used for mapping natural resource studies such as mapping of shallow water habitats with the satellite imagery. This study aims to map the distribution of shallow water habitats using SPOT-7 satellite imagery on Nusa Lembongan Island, Bali and test the level of accuracy. The method used true color composite and DII (Depth Invariant Index) transformation and uses the maximum likelihood classification. The classification scheme used 6 classes, namely sand, seagrass, macro algae, rubble, live coral, and dead coral. The results of this study indicate the distribution of shallow water habitat on Nusa Lembongan Island, Bali spread equally based on the level of water depth with a total area of shallow water habitat of 453.41 ha. The results of mapping accuracy test showed the overall accuracy of the DII transformation classification results is better than the composite image classification results with an overall accuracy of 75.43% and a kappa coefficient is 0.71. So from these results can be said that used of a water column correction with the DII method can improve image accuracy in mapping shallow water habitats.
Perbandingan Laju Pertumbuhan Abalon (Haliotis squamata) Menggunakan Metode Co-culture Dan Monoculture di Pantai Geger, Nusa Dua, Kabupaten Badung, Bali I Made Subali Arta Arta; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p12

Abstract

Penelitian ini dilakukan di Pantai Geger, Nusa Dua, Bali selama 60 hari. Tujuan penelitian ini adalah Mengetahui perbandingan laju pertumbuhan abalon (Haliotis squamata) dengan sistem budidaya co-culturedan monoculture di perairan Pantai Geger, Nusa Dua, Bali, mengetahui padat tebar abalon yang lebih efektif dilakukan pada sistem co- culture dan mengetahui padat tebar abalon yang lebih efektif dilakukan pada sistem monoculture. Metode yang digunakan menggunakan metode Rancangan Acak Lengkap (RAL) yang terdiri dari empat perlakuan dengan masing-masing perlakuan terdapat sebanyak tiga kali pengulangan. Perlakuan berupa kerang abalon (Haliotis squamata) yang diintegrasikan dengan padat tebar tanam yang berbeda dengan tanam rumput laut yang sama. Hewan uji ditebar setiap keranjang dengan kepadatan 40 ekor dan 20 ekor. Makanan yang diberikan untuk abalone yaitu cotoni sp. yang dimana rumput laut cotoni sp. didapatkan dari hasil budidaya. Berdasarkan perbandingan laju pertumbuhan abalon (Haliotis squamata) pada budidaya co-culture dan monoculture dari segi panjang abalon dengan padat tebar 20 dari sistem budidaya co-culture mendapatkan nilai panjang tertinggi sebesar 2.50%, sedangkan sistem budidaya co-culture dengan padat tebar 40 mendapatkan nilai tertinggi 4.19%. Pada berat abalon Haliotis squamata dengan sistem budidaya co-culture pada padat tebar 20 nilai tertinggi 0.04% dan padat tebar 40 nilai tertinggi pada sistem co-culture sebesar 1.04%. Pada panjang abalon Haliotis squamata dengan sistem monoculture padat tebar 20 mendapatkan nilai yang tertinggi 7.63%, sedangkan padat tebar 40 nilai tertinggi sebesar 1.28%. Pada berat abalon sistem monoculture dengan padat tebar 20 mendapatkan nilai tertinggi sebesar 2.67%, sedangkan padat tebar 40 mendapatkan nilai tertinggi sebesar 0.48%.
Perbandingan Morfometrik dan Meristik Lamun Cymodoceae serrulata di Perairan Sanur dan Tanjung Benoa, Bali Ni Putu Ayu Aryanti; Elok Faiqoh; I Dewa Nyoman Nurweda Putra
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p03

Abstract

Cymodoceae serrulata is a type of seagrass that has a slender and round-toothed shape on the tips of leaves that can live in a variety of substrates ranging from rocking to muddy sand. Morphometrics and meristic can describe the environmental conditions of living seagrasses which can be seen from leaf morphology, stem morphology, rhizoma morphology and root morphology. Morfometrics is a measurement to determine the quantitative morphology of an organism while meristic is a calculation of the number of parts of an organism. This research was conducted in January-April 2019 using a purposive sampling method at 8 observation stations in the waters of Sanur and Tanjung Benoa. Data were analyzed by sturges criteria and principal componen analysis. Based on the results of the study, leaf length ranged from 13.4-246.6 mm, leaf width ranged from 3-18.5 mm, stem length ranged from 1-130.3 mm, root length ranged from 10.1-134.1 mm, rhizoma length ranged from 10.1-78.8 mm, rhizoma diameter ranged from 1.2-3.73 mm, the diameter of the leaf stalk ranged from 1.11-3.63 mm and the number of leaves ranged from 2-5 strands. The principal component analysis showed that texture of the substrate (sand, dust, and clay) that most influences the morphometric-meristic seagrass Cymodoceae serrulata is the texture of dust and clay texture. Where the dust texture affects morphometrics-meristik such as the length of the leaf, leaf width, stem length, rhizoma length, root length and number of leaves. While of the stem diameter and rhizoma diameter and root length are influenced by clay texture.

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