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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
 1   2 
Search results for , issue "Vol 6 No 1 (2020)" : 18 Documents clear
Pengaruh Indian Ocean Dipole (IOD) Terhadap Produksi Penangkapan Ikan Lemuru (Sardinella lemuru) di Perairan Selat Bali I Dewa Gede Alit Sujana; I Dewa Nyoman Nurweda Putra; Ni Luh Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p07

Abstract

Indonesia is one of tropical country which is very vulnerable to extreme phenomena in its water, such as Indian Ocean Phenomena (IOD) that occurred in Indian Ocean. The Bali Strait is directly adjacent to the Indian Ocean in the south area. Bali Strait is a region in Indonesia that has a high potential fishery resources namely, lemuru (Sardinella lemuru). The purpose of this study is to observe correlation and influence of IOD on lemuru production in Bali Strait between 2012 - 2016. The data used in this research are lemuru data was collected from 3 fish landing base namely PPP Muncar, PPN Pengambengan and PPI Kedonganan and IOD data used Dipole Mode Index (DMI) monthly from 2012 – 2016. The calculation used correlation equation, regression of second order polynomial. The highest lemuru production during 5 years, from 2012 untill 2016 was in 2015, accounted of 27,144,784 kg and the lowest production was in 2012 accounted of 5,644,146 kg. Based on that results, the highest yield of lemuru in the transition period II (September - November) of 31,938,833 kg with an average yield of 2,129,256 kg and the lowest was in east season (June - August) of 9,216,230 with average yield of 614,415 kg. The influence of IOD Index with lemuru production in Bali Strait has a determination value (R2) of 0.0558 and has a correlation of 17.40% with a positive influence (directly proportional). It was categorized as very weak.
Laju Dekomposisi Serasah Daun Mangrove Bruguiera gymnorrhiza dan Sonneratia alba di Kawasan Hutan Mangrove Pulau Penyu, Tanjung Benoa, Bali Artha C. Rosevina Anak Ampun; I Wayan Gede Astawa Karang; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p12

Abstract

Mangroves are plants that play an important role in maintaining the fertility of mangrove ecosystems by contributing organic material derived from leaf litter. The rate decomposition of leaf litter is a destruction process by dead organisms into smaller particles. The decomposition process of mangrove leaf is affected by lignin and wax in nitrogen supply, environmental conditions, abundance of organisms, and air temperature. This research aims to determine the decomposition rate of leaf litter and percentage decomposition of Bruguiera gymnorrhiza and Sonneratia alba in mangrove forest area in Penyu Island, Tanjung Benoa, Bali. This research was conducted from February to April 2017. The method in this research used litter trap method. The location of the stations was based on the distance of the mangrove trees to the sea. Litter traps were placed on the six (6) stations. During the 60 days of decomposition process, Sonneratia alba leaf was decomposed faster than Bruguiera gymnorrhiza. The highest decomposition rate of Sonneratia alba leaf litter found at station 1 (1.7 g/day) with 99.9% decomposed, and the lowest at station 2 (1.38 g/day) with 99.64% decomposed. The highest decomposition rate of Bruguiera gymnorrhiza leaf litter found at station 1 (1.52 g/day) with 98.88% decomposed, and the lowest at station 2 (0.99 g/day) with 84.66% decomposed.
Pola Pertumbuhan Rumput Laut Yang Menggunakan Kantong Dan Tanpa Kantong Di Perairan Pantai Kutuh, Badung, Bali Ayu Putu Wiweka Krisna Dewi; Endang Wulandari Suryaningtyas
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p18

Abstract

Seaweed farmers on Kutuh Beach experienced problems in seaweed cultivation activities, namely that seaweed cannot grow well. This is due to the large number of predators that ate seaweed in the cultivated area. One method that can be used to overcome this problem was using bags in seaweed cultivation. The purpose of the research that was carried out in July-October 2018 was to determine the effect of using bags on seaweed cultivation in Kutuh Beach waters. The method used in this research was experimental using two treatments (planting seaweed using bags and without bags) and three replications. Water quality parameters measured as supporting data ware DO, pH, salinity, temperature, nitrate, and phosphate. The result of this study was the growth of seaweed cultivated using bags is better than the growth of seaweed cultivated without bags.
Komposisi Jenis Dan Fluktuasi Kelimpahan Plankton Secara Temporal Di Perairan Selat Lombok Putu Maya Witariningsih; Yulianto Suteja; I Nyoman Giri Putra
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p17

Abstract

Indonesian Throughflow (ITF) is a circulation of water mass in Indonesian, water are carrying from the Pacific Ocean to the Indian Ocean. When the water mass from the Pacific Ocean to Indonesian waters will mix with the water mass of Indian Ocean. One of the outflow is the Lombok Strait. The mixing of process bring nutrient-rich in bottom layer to rise to the upper layer and it will affect the fertility. One indicator of water fertility by measuring the abundance and distribution of plankton. The aims of this study to determine the temporal of composition species and fluctuations of plankton abundance temporally in the waters of the Lombok Strait. The study was conducted in the Lombok Strait in November 2017. Data was collected at one point and sample was only take on the surface of the waters. The genus composition of the most widely found phytoplankton Bacillariophyceae class (19 genera) and from the widely obtained zooplankton Hexanauplia class (7 genera). The highest abundance of phytoplankton occurs during high tide during afternoon. This phenomenon is caused by photosynthesis of phytoplankton in the water surface. In contrast to the abundance of the highest zooplankton occurs during high tide in the early morning. This is caused by zooplankton's daily vertical migration and negative phototaxis. Comparison of phytoplankton abundance with zooplankton abundance is inversely proportional, zooplankton abundance depends on abundance of phytoplankton, because phytoplankton grow faster by cell substraction, compared to phototaxis of in zooplankton. It is also a predation of phytoplankton by zooplankton.
Kelimpahan dan Keanekaragaman Ilmy Amalia; I Wayan Restu; Endang Wulandari Suryaningtyas
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p08

Abstract

Serangan Island is a strategically touristic beach area where there is a vast expanse of seagrass being cultivated as habitat for the epiphuna, the beach has tourism activities such as surfing and swimming which could affect the life of epiphuna. The purpose of this study is to know the abundance and diversity of epiphuna in the seagrass area using the 1x1 m quadrat transect method. The study was conducted in February 2017. The highest epiphuna abundance at location 1 was 25,1 ind/m2. The lowest abundance value is at location 2 which is 19,1 ind/m2, whereas at location 3, it has the abundance value of 21,1 ind/m2. The epiphuna species that dominates from all three locations are from the Arthropoda phylum including Clibanarius taeniatus, Coenobita sp. and Calcinus laevimanus. The highest diversity index was found in location 1, 2,211, location 2 was 2,132 and the lowest was at location 3 which was 1,853, while the highest seagrass density of the three stations was Syringodium isoetifolium type 358 stands/m2 and the lowest was Thallasodendron ciliatum, 29 stands/m2. The results of the overall water quality measurement, ie, the temperature ranged from 27,6 to 28,40C, the pH ranged from 7,7 to 7,9, the salinity ranged between 28-30 ppt and DO ranged between 4,5-4,7 mg/l. Serangan Island coastal waters have the highest abundance of epiphuna in Arthropoda phylum, moderate (location 1 and 2) and low (location 3) diversity level, and with a normal water quality which is feasible for epiphuna life.
Komposisi Jenis dan Struktur Komunitas Ikan di Ekosistem Lamun Pantai Sindhu, Sanur, Bali Kolis Pratama; I Wayan Arthana; Dewa Ayu Angga Pebriani
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p13

Abstract

Sindhu Beach is one of the beaches which located in Sanur. The coastal areas of Sindhu Beach has long been used for various economic activities, such as recreation areas or marine tourism. So that these activities can adversely affect the sustainability of the seagrass ecosystem as a habitat for various types of aquatic biota, especially fish. This study aims to determine the composition of fish community species and structures, to know the types of seagrass, and also to know the condition of water quality in the seagrass ecosystem of Sindhu Beach, Sanur, Bali. This study has been conducted from January to February 2018 by direct observation method. The results of the composition of fish species as a whole found 537 of fish that consisting of 22 species and it came from 11 families. The overall value of community structure is obtain by the value of the diversity index (H') of 2.68, uniformity index (E) 0.87, and the dominance index (C) 0.09. The types of seagrasses which found in the study location was consist of 8 species of seagrass covering Enhalus acoroides, Syringodium isoetifolium, Halodule pinifolia, Halodule uninervis, Thalassia hemprichii, Cymodocea rotundata, Halophila ovalis, and Halophila spinulosa. The result of measurement of water quality parameters from all stations were obtain the average measurement of dissolved oxygen 7,1 mg / l, salinity 30o/oo, pH 8,24, and temperature 29,80C. The result of measurement of water quality parameter shows that the condition of seagrass ecosystem of Sindhu Beach was still considered optimal for marine life.
Kerapatan dan Persebaran Tumbuhan Air di Danau Buyan Kabupaten Buleleng, Provinsi Bali I Gusti Made Sudipta; I Wayan Arthana; Endang Wulandari Suryaningtyas
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p09

Abstract

The Bali province has four lakes, one of them is Buyan lake. One of communities that has important roles in lake waters ecosystem as an primary production is a community of aquatic plants. The existence of aquatic plants as weed will suffer losses more than the beneficial. So that research on density and distribution of aquatic plants in Buyan lake is very important to do. The research aims to find out the density, distribution, domination, percent of closure and other types of aquatic plants in Buyan lake. This research was conducted for 1 month during the month of March until April 2017. The value of the density of the population (KP) aquatic plants has ranged from 2-357 individuals/m2. The value of the frequency of attendance (FK) aquatic plants ranging between 0,1-1. Morisita Index (Id) has ranged from 4,9-1,39 which shows a pattern of clumped. The value of Dominance (D) aquatic plants has ranged between 0,0001-0,9823 that showed with its low variation and high abundance. The value of aquantic plant cover has percent range from 1-72% that showed of the vegetation very rare, rare and dense. The aquatic plants found during research had 4 types of living that were type of free float (Free Floating) Salvinia molesta, Eichhornia crassipes (Submerged) Myriophyllum aquaticum, (Floating) Alternanthera philoxeroides, sticking (Emergent) Schoenoplectus paludicola, Phragmites australis, Typha capensis.
The Competition among Fish Species Based on Types of Food in Buyan Lake, Bali, Indonesia Shanti Paramita Jayanti; Pande Gde Sasmita Julyantoro; Gde Raka Angga Kartika
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p14

Abstract

Buyan Lake is located in Bali Province, this lake has a variety of fish species which several of those species are introduced species that called as alien fish. The relationship interaction between native fish and introduced fish can be described based on the study of food habit and competition of food types. The study was conducted from January to March 2018. Types of fish caught in Buyan Lake during the study were 7 species of fish namely Oreochromis niloticus, Amatitlania nigrofasciata, Osteochilus vittatus, Cyprinus carpio, Xiphophorus hellerii var. 1, Xiphophorus hellerii var. 2, and Rasbora lateristriata. The results showed that the fish with the highest ISC value was Amatitlania nigrofasciata, while the fish with the lowest ISC (Index of Stomach Content) value was Xiphophorus hellerii var. 1. The standard deviation range of almost all fish species is close to zero, so it is suspected that the contents of the stomach are nearly similiar. Amatitlania nigrofasciata with the highest standard deviation values are thought to have a variety of gastric contents. Based on the analysis of the contents of the stomach content, Oreochromis niloticus, Osteochilus vittatus, and Xiphophorus hellerii var. 2 are belonging to herbivorous fish. While Amatitlania nigrofasciata, Cyprinus carpio, Xiphophorus hellerii var. 1, and Rasbora lateristriata are belonging to omnivorous fish, which are tending to herbivores. The competition of food type is quite strict, there is similarity of food among species of fish in Buyan Lake, which is mean that they are fighting over the same food resources.

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