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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.
Arjuna Subject : -
Articles 251 Documents
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Penggunaan Metode Rolling Mosaic Untuk Mendukung Pengembangan Peta Prakiraan Daerah Penangkapan Ikan Wilayah Pesisir Komang Iwan Suniada
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p07

Abstract

Predicted fishing ground maps (PPDPI) which made using satellite image data is often constrained by clouds, causing its production not too optimal. Rolling mosaic methods examined here is expected to reduce cloud cover so the information about oceanographic conditions can be more visible and can increasing PPDPI production. In July, the percentage of sea surface temperature data can increase from 15.3%-30.29% using 1-day mosaic data, to 40.46%-56.75% using 3-day mosaic, it increases to 72.24%-77.88% using 7-day mosaic data and increase to 84.19%-89.07% using 14-day mosaic. While the percentage of sea surface temperature data in December can be increased from around 4.93%-13.03% to 41.48%- 51.60%. In general, at July and December, the relationship between 1-day mosaic and 3-days mosaic data, 7-days and 14-days are very strong, but the strength of the relationship will decrease (the correlation coefficient gets smaller) along with the increasing of the time range used to mosaicking the data. The RMSE shows that the RMSE between the 1-day mosaic with 3-days mosaic is 0.288 (July), 0.263 (December); RMSE between 1-day mosaic and 7-days mosaic is 0.388 (July), 0.387 (December) and RMSE between 1-day mosaic and 14-days mosaic is 0.471 (July), 0.477 (December). This RMSE values shows that the longer time range used to construct the mosaic, the error value will also increase. Scoring analysis using percentage of data, correlation coefficient and RMSE as a parameters indicate that the 7-days mosaic method has the highest score so it is considered as the best method to be used to predict sea surface temperature with minimum cloud cover.
Jenis Pakan yang Berbeda terhadap Performa Benih Arwana Silver Albino (Osteoglossum bicirhosum) Sarmila Sarmila; Agus Setiawan; Hylda Khairah Putri; Susilawati Susilawati; Farid Mudlofar; Sri Warastuti; Ridwan Salim
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p03

Abstract

Albino Silver Arowana (Osteoglossum bicirrhosum) is one of the most popular freshwater ornamental fish commodities alongside Super Red Arowana fish. This is because the price is affordable compared to the original Indonesian Arowana type. Albino Silver Arowana cultivation activities in Indonesia have begun to develop, but information on suitable feeds to support performance is poorly studied. This study aimed to determine the right type of feed to provide the best growth rate and survival rate for albino silver Arowana seeds. The albino silver Arowana seeds used in this study had an average size of 7. cm as many as 72 individuals. Seed maintenance was carried out for 40 days. This study used a completely randomized design (CRD), with 4 treatments and 3 replications. Treatment A used Kroto (Oecophylla smaragdina), treatment B used rebon shrimp (Mysis relicta), treatment C used yellow mealworm (Tenebrio Molitor), and treatment K used bloodworm (Chironomus sp.). Seed growth rate data were collected at the end and beginning of maintenance. Observation of the survival rate of seeds was carried out every day. The data obtained were tabulated and statistical analysis was performed (ANOVA). The results showed that the sources given in treatment K and treatment A had the highest growth compared to those in treatment B and treatment C.
Bioakumulasi Timbal (Pb) pada Bivalvia (Anadara antiquata, Anadara granosa dan Perna viridis) dari Perairan Lekok, Pasuruan Devi Ulinuha; Ima Yudha Perwira
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.p02

Abstract

Lead is one of inorganic material causes pollution in waters that have a high level of toxicity for organisms. Lead pollution in waters can be accumulated by several water organisms, such as Bivalves. Bivalves are type of shellfish that can accumulate heavy metals. This study aimed to know the bioaccumulation of Lead on the Bivalves (Anadara antiquata, Anadara granosa dan Perna viridis) found in Lekok water (Pasuruan, Jawa Timur). The amount of Lead in the water, sediment and Bivalves was measured by using Atomic Absorption Spectro-photometer (AAS). The bioaccumulation of Lead on the Bivalves was analyzed by using Bioconcentration Factor (BCF). The result showed that amount of Lead in the water and sediment were 0,356 mg/L and 21,245 mg/kg, respectively. The BCF value of Lead on the Bivalves of Lekok waters were <30 indicating low accumulation level.
Pemetaan Perubahan Luasan Mangrove Menggunakan Citra Sentinel-2A Pasca Kematian Massal Mangrove di Denpasar-Bali Rowand Danny Sebastian Adinegoro; I Dewa Nyoman Nurweda Putra; I Nyoman Giri Putra
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p08

Abstract

Province of Bali is one of the mangrove forests distributed in Indonesia, which is spread over three sites, including Tahura Ngruah Rai. The mangrove area in the Tahura, especially in Denpasar city, mangrove forest suffered due to human activities and natural factors. Therefore, there is a need to monitor the distribution of mangrove forests in the area. Remote sensing is one of the technologies that can be used to control the extent and distribution of mangrove in that area. The aimed of this study was to determined the best band combination on the Sentinel-2A in detecting the mangrove-specific land cover, which was then used to map the extent of mangrove areas after death. The Band combinations tested are the combinations of band 4-3-2, 11-8-4 dan 8-11-2 on the Sentinel-2A. The results indicated that the value of producer accuracy (PA) as well as user accuracy (UA) in the mangrove class with combined band of 4-3-2 (PA= 92.59%, UA= 98.04%), 11-8-4 (PA= 85.19%, UA=88.46%), and 8-11-2 (PA= 71.15%, UA= 84.09%). This study concluded that the band combination of 4-3-2 is able to detect the mangrove better than the band combination of 11-8-4 and 8-11-2 with the total accuracy and an accuracy of the kappa respectively around 91.24% and 91.15%. Mangrove forests of the Tahura Ngura Rai, Denpasar city, had decreased the extent of mangrove forests by 25.58 hectares over a period of four years in 2016 (before incident) until 2020 (after incident).
Analisis Kecepatan Perambatan Gelombang Internal Soliter di Selat Lombok dengan Citra Himawari-8 Chonnaniyah Chonnaniyah; I Wayan Gede Astawa Karang; Abd. Rahman As-syakur; Takahiro Osawa
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p04

Abstract

Internal waves are phenomena that occur below sea surface. One of the most observed types of internal waves was called a solitary wave or soliton so it is often known as an internal solitary wave (ISW). Lombok Strait was one of the straits located in the southern part of the Indonesian archipelago which has the characteristics of intensive ISW generation because this strait has complex waters characteristics. This study aim to analyzed in detail the changes in the ISW propagation speed at the first crest soliton every 10 minutes using Himawari-8 data. The detected ISW pattern is then extracted at the first crest of the soliton as a reference to measure the distance between the detected soliton every 10 minutes as input in estimating the propagation speed. The Himawari-8 image which was in this study detected 2 ISW packets in the Lombok strait area. Packet 1 which was detected in the northern part of the Lombok strait approaching Kangean island had a group speed of 2.22 m/s and Packet 2 which was detected in the area around the Lombok strait had a group speed of 2.78 m/s. The difference in group velocity of the two packets is due to the variation in depth along the ISW propagation. The analysis results of changes in ISW propagation speed in this study indicate that Himawari-8 imagery is a very effective instrument for analysing changes in ISW propagation speed in detail every 10 minutes which is difficult for satellite imagery which usually has low temporal resolution.
Pertumbuhan Ikan Tongkol Abu-Abu (Thunnus tonggol Bleeker, 1851) yang Tertangkap di Perairan Selat Bali Made Ayu Pratiwi; Gde Raka Angga Kartika
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.p03

Abstract

Longtail Tuna (Thunnus tonggol) in the waters of the Bali Strait is a by-catch fish, so that information on this fish resource was still very lacking and its management of longtail tuna was often neglected. The aimed of this study is to predict the signs of the unsustainability of longtail tuna resources based on growth aspects which include the distribution of length frequency, estimation of age groups, growth patterns and growth parameters. Data collection was carried out from December 2018 to February 2019. The growth pattern estimated by relationship of length and weight, cohort was identified using an analytical model based on the FISAT program (FAO I-CLARM Stock Assessment Tools) and growth parameters were analyzed using the Von Bertalanffy growth model. It can be seen that, the catch is dominated by the size of the fish that have matured gonads or adults (69% females and 73% males). The growth pattern of female and male of longtail tuna is negative allometric (length growth is more dominant than weight). So it can be assumed that there is an inconvenience in environmental conditions and competition in fighting for food and space in the waters of the Bali Strait.Longtail tuna had asymptotic length values of 784.71 mm (female) and 738.04 mm (male) with growth coefficients of 0.13 (female) and 0.18 (male). The growth performance inteprated as quite high when compared to other waters in Indonesia.
PENGEMBANGAN EKOWISATA DI PULAU PENYU TANJUNG BENOA BALI BERDASARKAN PRINSIP-PRINSIP EKOWISATA I Putu Oka Saduarsa; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p09

Abstract

The existence of sea turtle in its habitat, especially in Bali is endangered. Moon cot sari sea turtle island is a one of tourist destination that carries out conservation of sea turtles. This turtle island provides more education about turtles to the tourists. Turtle island is still in the developing stage to become an ecotourism destination. Ecotourism defines as a tourism that emphasizes the responsibility of preserving nature, providing economic benefits and maintaining cultural integrity for the local community. The development of turtle island as an ecotourism destination could be evaluated from the implementation of the principles of ecotourism such as education, recreation, society walfare, pasticipation of society. The data was collected using interview by closed question questionnaire and the output of this research is a descriptive value. The questionnaire were used to asses if those principles were already applied in turtle island or not. The total of respondents 450 tourists, 15 person staff and 15 person local community. Sampling is carried out for 1.5 months from January to March 2019 every Sunday according to the high season period on that month. The results found that on average 80% of respondents answered that they have gained insight about sea turtles and better understand about sea turtles conservation (principle of education), 75.5% of respondents answered that the turtle island has adequate facilities to give the impression of a pleasant tour (principle of tourism), 100% of staff and stakeholder respondents said the turtle island had a better economic impact (society walfare), 100% of the society respondents said that they participated in preserving the turtle and the environment of the local mangrove forest ( principle of society participation and conservation).
spatial distribution of plankton in makassar strait Ni Wayan Sintaningsih; Eloq Faiqoh; I Dewa Nyoman Nurweda Putra
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p05

Abstract

Selat Makassar merupakan lintasan pertama arlindo yang dimana lintasan pertama ini sebagaian besar mentransfer air yang kemudian menuju selat Lombok. Arus lintas Indonesia ini membuat perairan Indonesia terutama bagian timur menjadi subur akibat adanya proses upwelling dan proses pencampuran serta interaksi air dengan udara yang menyebabkan kandungan nutrisi dan mineral menjadi kaya pada lapisan laut dalam. Beberapa penelitian tentang plankton di Selat Makassar masih berkisar tentang klorofil- a sedangkan penelitian tentang plankton sendiri masih belum ada. Oleh karena itu, penelitian tentang distrubusi spasial plankton di selat makassar penting dilakukan yang dapat digunakan sebagai informasi dasar tentang pengaruh arlindo terhadap struktur komunitas plankton di selat makassar. Metode pengambilan plankton menggunakan metode tuang. Metode ini dilakukan dengan mengambil air dengan menggunakan alat water sampler sebanyak 30 liter pada kedalaman 0 meter, 100 meter dan 250 meter. Fitoplankton yang ditemukan di Selat Makassar yaitu Kelas Bacillariophyceae yang sering ditemukan dengan kelimpahan yang tinggi dengan genus Chaetoceros dan Nitzhia.dari kelas Cyanophyceae yang sering ditemukan dengan kelimpahan relative tinggi adalah Oscillatoria sedangkan kelas Chlorophyceae yang ditemukan adalah genus Chroococus. Sedangkan zooplankton yang ditemukan di Selat Makassar yaitu Kelas hexanaupilia yang sering ditemukan dengan kelimpahan relatif tinggi yaitu genus Cyclops. Kelas Malacostraca yang ditemukan di Selat Makassar yaitu Naupiliisedangkan kelas Maxilopoda yang ditemukan di Selat Makassar yaitu genus Copepod.
Karakteristik Sosial Ekonomi Nelayan Pemanfaat Hiu Tikus (Alopiidae) di Manggis, Karangasem, Bali Hanifa Miranda I.H. Putri; I Wayan Arthana; Elok Faiqoh; Ranny R. Yuneni; Yuniarti K. Pumpun
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.p14

Abstract

Thresher sharks are known to have substantial economic value. They are caught globally as target and as bycatch in tuna fisheries. Due to their declining population, they are listed as an appendix II species on CITES, therefore any form of trade and fisheries related to the species have been nationally and internationally regulated. However, information on thresher shark fisheries in Bali is still limited. This study aims to socio-economically characterize thresher shark fishermen in Manggis, Karangasem. The research was conducted in August 2020 – October 2020 by interviewing 53 out of 119 recorded shark fishermen using a structured questionnaire. Shark fishermen use surface longlines to catch thresher sharks (Alopiidae) in between 3 areas, North Nusa Penida-Karangasem, east Nusa Penida and Bangko-Bangko. The fishermen catch sharks exclusively during the months of June-October and catch tuna the rest of the year. Operational costs for 1 boat ranges between Rp 121.000 – Rp 250.000 during 1 round trip. The income generated from shark fishing each trip averages to about Rp 627.714 per boat. Prior to the Covid-19 pandemic, some of the fishermen work jobs in the tourism sector. However, due to the pandemic’s impact on tourism, they have no choice but to be fishermen full time. Although thresher shark fisheries in Manggis are generally small scale, conservation and management strategies need to be implemented to ensure sustainable use of shark resources.
Strategi Prioritas Pengembangan Wisata Rumput Laut Berbasis Desa Adat di Pantai Geger, Kelurahan Benoa, Badung, Bali I Putu Aditya Budi Wacika; I Gusti Ngurah Putra Dirgayusa; Gede Surya Indrawan
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p18

Abstract

Community-based tourism management can be used as a reference in tourism development because it provides great opportunities for local communities in all of processes, especially planning, management, monitoring and evaluation. The purpose of this study was to determined the internal and external potential of Geger Beach and to develop strategies for developing seaweed tourism based on traditional villages. Data collection methods consisted of observation, interviews, questionnaires, and literature study. The analysis used in this study were descriptive qualitative analysis and SWOT analysis. Based on the study results, the main strengths of the development of seaweed tourism in Geger Beach is the existence of cooperatives that’s integrated by traditional villages and the main weakness is the supporting facilities still need to be improved. The highest opportunity is the involvement of local communities and the biggest threat is pollution of the aquatic environment due to hotel waste. The priority strategies for developing seaweed tourism in Geger Beach are to raise the role of the pecalang segara immediately in controlling the security and guarding system of Geger Beach, collaboration between the government and traditional villages in implementing policies and regulations that have been made, increasing the role of traditional villages which include local community participation, creates seaweed tourism with its own characteristics from the Peminge Traditional Village, and also creates a master plan to support the successful development of seaweed tourism.

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