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INDONESIA
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.
Arjuna Subject : -
Articles 18 Documents
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Search results for , issue "Vol 8 No 2 (2022)" : 18 Documents clear
Identification of Dominant Shark Fins Landed at The Port of Benoa, Bali Based on CO1 Gene Yuni Debora Prasicilia Sitorus; Pande Gde Sasmita Julyantoro; Ayu Putu Wiweka Krisna Dewi
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p07

Abstract

Indonesia is one of the world's most shark-catching countries. One of the fishery ports that has a by-product of sharks is the Port of Benoa. The purpose of this study was to determine the species and phylogenetic relationship of sharks from dominant fin samples landed at the Port of Benoa, Bali based on the results of morphological identification and DNA barcoding techniques. The study was conducted from January to February 2018 at the Pengawasan Sumberdaya Kelautan dan Perikanan Base (PSDKP) Benoa. This research uses exploration method with survey technique. The data used in this research is primary data of dominant shark fin samples in research location area and secondary data of location where shark caught by fisherman based on PSDKP database. The results showed that by-catch sharks from dominant fin samples at the Port of Benoa, Bali based on morphological identification and DNA barcoding technique were Prionace glauca (Blue Shark) species. The results of phylogenetic analysis of by-catch shark species from dominant fin samples landed at the Port of Benoa, Bali have close relation with Carcharhinidae family. Prionace glauca shark species have an amplified nucleotide base length of 600 pb with similarity reaching 99 values with species present in GenBank.
Pemetaan Distribusi Lamun di Selat Ceningan Menggunakan Drone Komersial I Gede Andika Wijantara; I Wayan Gede Astawa Karang; Gede Surya Indrawan
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p12

Abstract

Remote sensing is growing with the drone which can overcome problems and weaknesses on satellite imagery. This research uses mapping techniques on seagrass to the species level using drones that use the high resolution to generate data. The purpose of this study was to determine the distribution species of seagrass in Ceningan Strait using drone. Data is collected at the date of 12 and 13 march 2020 by using 50 cm x 50 cm transect which is done by systematic random sampling, and images capture using drones phantom 3 standard by performing five flights, and the results will be combined into one form of a mosaic. The method used is the classification of GEOBIA (Geographic Object Based Image Analysis) which is validated with field data. From the results of the research conducted, three species were identified using drones, namely seagrass with the species Thalasia hemprichi, Cymodocea rotundata, and Syringodium isoetifolium. The results of the drone image classification showed that the variation in the area of cover of each species with the highest incidence was seagrass with Cymodocea rotundata (2.46 ha), followed by Thalasia hemprichi (1.02 ha), and Syringodium isoetifolium (0.26 ha). The results of the image classification show a fairly good level of accuracy with an accuracy value of 68% and the kappa coefficient with a value of 0.55. From the results obtained, it was concluded that the mapping of seagrass species using drones was categorized as quite good.
Korelasi indeks keanekaragaman dan kerapatan tegakan dengan simpanan karbon mangrove Estuari Perancak Casamira Gitta Prasetyo; I Dewa Nyoman Nurweda Putra; I Nyoman Giri Putra
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p08

Abstract

Land use change is a huge threat for mangrove ecosystems,which are known for their high carbon sequestration and storage capacity.Vegetation restoration efforts are often undertaken, but fail to restore optimal ecosystem carbon sequestration. The mangrove forest of Perancak Estuary with a history of restoration project was made the subject of this research. The objectives include: (i) estimation of mangrove biomass and sediment carbon stock; (ii) comparison of restored, mixed and natural mangroves’ total carbon stock; (iii) correlational analysis between stand density and diversity indices with ecosystem carbon stock. Nine sampling points were determined within three mangrove categories (mixed, natural, restored). Stand characteristics and diameter at breast height (DBH) were measured to allometrically estimate biomass carbon. Sediment carbon was analyzed with Loss on Ignition (LOI) method. Correlational analysis was done with Pearson’s correlation coefficient. Total ecosystem carbon stock is 4472,93 tonnes ha-1 (biomass C: 4046,31 tonnes ha-1; sediment C: 426,62 tonnes ha-1). Highest carbon stock value was found on restored mangroves due to high contribution of sediment C offsetting its low biomass C. Lowest carbon stock value was found on natural mangroves due to decreased root biomass production and increased decomposition due to change in tidal regimes. There is a strong positive correlation between stand density and biomass carbon. Simpson index of diversity has a stronger (though non significant) correlation with biomass carbon than Shannon-Wiener index.
Analisis Kesesuaian Wisata dan Kesediaan untuk Membayar Kategori Wisata Rekreasi di Pantai Samuh, Bali Angel Maria Arief; Nyoman Dati Pertami; Made Ayu Pratiwi
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p13

Abstract

This study aimed to determine the tourism suitability index and the willingness to pay (WTP) for the category of beach recreation tourism in Samuh Beach area, Bali. The research method used was descriptive qualitative. The parameters used to determine the value of the coastal recreation were beach type, beach width, current speed, brightness, depth, beach slope, water base material, current velocity, coastal land cover, hazardous biota, and availability of fresh water. The calculation result of the tourism suitability index value at Samuh Beach for beach recreation activities at station I was 2.05% which included in the Suitable category, station II was 2.88% which included in the Very Suitable category, and Station III was 2.92% which included in the category. Very Suitable category. Based on that result, it can be seen that station III occupies the highest IKW value in the Very Suitable category. The average value of tourism suitability index in Samuh Beach was 2.62% (very suitable category). The average value of the WTP was IDR 9.500,- and the total value was IDR 57.000.000,- - at Samuh Beach. This value was greater than the entrance fee for Samuh Beach tourism in the form of a motorbike parking fee of IDR 2000, - and a car park of IDR 5000,- respectively. Respondents are willing to pay more for environmental services obtained from tourism objects in Samuh Beach.
Potensi Sumber dan Sebaran Sampah Laut di Ekosistem Terumbu Karang Perairan Pulau Kelapa, Pulau Kelapa Dua, dan Pulau Harapan, DKI Jakarta Muhamad Gilang Arindra Putra; Neviaty Putri Zamani; Nyoman Metta N. Natih; Amir Yarkhasy Yuliardi
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p09

Abstract

Pollution is a threat to coral reefs in Indonesian waters. The number of coral reefs that are in very good condition denies very little compared to the total area of ??coral reefs in Indonesia. One form of pollution that can threaten coral reefs is marine debris. This study aims to identify potential sources of marine debris that can disrupt the health of coral reefs. the research was carried out in the waters of Kelapa Island, Kelapa Dua Island and Harapan Island, DKI Jakarta. The data used includes current data obtained using secondary data, data on the amount of marine debris,and the water base data substrate obtained using the LIT method. The results showed that the waste was thought to come from community activities, tourism and fisheries. The location that can be a source of marine debris in the research location comes from the mainland of Jakarta Bay. The bottom substrate conditions are in the "bad" to "medium" category. The range of the lowest proportion of live coral cover is 10,8% and the highest live coral cover at 31.1%. The coral reefs in the research location are in a state of worry and their existence is threatened by pollution of marine debris.
Pendugaan CPUE (Catch Per Unit Effort) dan Potensi Maksimum Lestari Ikan Lemuru (Sardinella lemuru) yang Didaratkan di PPN Pengambengan, Jembrana-Bali I Gusti Bagus Ngurah Adywan Surya Bhuwana; IGB. Sila Dharma; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p17

Abstract

Lemuru is one of the highest catches landed in PPN Pengambengan. PPN Pengambengan is a strategic fishery port owned by Jembrana with a function as a center or center for marine fisheries landing. Improvement of fishing technology will be related to the problem of abundance or availability of fishery resoure stocks, so it is necessary to study CPUE, MSY and JTB so that they can utilize the resources with optimal but still maintain its preservation in nature. This research has a purpose, which is to know the tren of CPUE, MSY and JTB of lemuru fish (Sardinella lemuru) landed in PPN Pengambengan. The method used is a quantitative descriptive method using a surplus production analysis from Schaefer. The data used in this study are catch and fleet data from 2014–2019 obtained directly from the PPN Pengambengan office. The results showed the highest CPUE in 2015 amounted to 6,15 tons/fleet, but after that the CPUE tren tended to decline, especially since 2016 while the MSY value was obtained at 9.598,49 tons/year with a maximum sustained effort of 4.545,45 fleets/year. Furthermore, the JTB value is 80% of the MSY value, a figure of 7.678,8tons/year is obtained. This indicates overfishing and over-exploitation in the PPN Pengambengan area. To prevent overfishing and over-exploitation, prevention can be done, such as limiting fishing capacity and effort can also apply fisheries management models, such as co-management and EBFM (eco-based fisheries management).
Analisis Hubungan Nilai Tukar Nelayan Dengan Jenis Tangkapan Nelayan Di Desa Pengambengan, Kecamatan Negara, Kabupaten Jembrana, Bali Ida Bagus Ketut Ravidhya Krisna Sekar; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p18

Abstract

This research aims to determine the fishermen’s exchange rate (NTN) and how the catch composition could affect the income of purse sein fishermen in Pengambengan Village. The object of the research is purse sein fishermen in Pengambengan Village, sampling has carried out by using purposive technique, and data was collected using questionnaires and interviews. The method used in this research are the NTN calculation method and multiple linear regression statistical method with hypothesis test, T-tets, F-test, and the coefficient of determination (adjusted R2 Square). The results show in the harvest season, almost all of the fishermen experienced a surplus (NTN above 100), while in the famine season only fishermen with high profit-sharing system experienced a surplus and the other experienced a disadvantage. For both of the two seasons, the fishermen’s catch composition are consist of lemuru, tongkol and layang; base on the T-test results, lemuru catch affect significantly on fishermen’s income during the harvest season, and layang catch affect the income of fishermen in the famine season. somultaneously the catch composition, lemuru, tongkol and layang affect fishermen income compared only 1 type of fish catch, and seen from the Coefficient of Determination by 6,6 % in the harvest and by 7,5 % in the famine season. The fishermen’s income is also influenced by other variables which are not included. in the model.
Struktur Komunitas Karang Lunak Pada Kedalaman Berbeda di Teluk Jemeluk Amed, Kabupaten Karangasem, Bali Putu Adi Prawira; Dwi Budi Wiyanto; I Gusti Ngurah Putra Dirgayusa
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p16

Abstract

Reef is ecosystem in tropical waters which rich of biota constituent, with high species diversity. One of biota that compiler coral reefs are soft corals (Octocorallia, Alcyionacea). The aim of this research is to know the soft coral community structure at different depths and the influence of the limiting factors of soft corals. Soft coral data retrieval is done in 3 observation points. Each depth research carried out by installing 6 transects quadrants through 100 meter transect line parallel to the shoreline. Data retrieval of water quality carried out on site research and laboratory testing. The water quality data taken include; temperature, brightness, salinity, pH, flow velocity, DO, depth, nitrate and phosphate. Retrieving data using the soft coral community structure. The highest density values found in every station a depth of 5 meters and the lowest at each station a depth of 15 meters. According to Odum (1971), the value of diversity in the research area included in the high category of H' ? 3.0, as well as to the value of uniformity in the high category at stations 1 and 3 on each depth of H ? 0.6 and at station 2 for each depth in the low category of E ? 0.4. According to Odum (1971), the value of dominance classified in the high category of 0.75 to 1.00, which means that there are species that dominate that Sinularia flexibillis except at a depth of 15 meters which is rated as moderate dominance. The observation of the condition of the community structure is still relatively good, as the limiting factor in the study area is very suitable for soft corals.

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