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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 17 Documents
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Search results for , issue "Vol 7 No 2 (2021)" : 17 Documents clear
Epifauna Pada Ekosistem Lamun Di Kawasan Pantai Sumberkima dan Pantai Karang Sewu, Bali Anisa Setyawati; Elok Faiqoh; Gede Surya Indrawan
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.p17

Abstract

The seagrass field in the Sumberkima and Karang Sewu Beach are two of the habitats that support epifauna life. Epifaunas benefit the seagrass field by using it as a habitat, food supply source, and shelter from predators. This research aim to understand the epifauna density in the seagrass ecosystem, its correlation with seagrass density, and their condition in the Sumberkima and Karang Sewu Beach. This research was conducted in January – March 2020, which used the purposive randomize sampling method. Results show that Karang Sewu Beach only has the seagrass Enhalus acoroides, while three species, Enhalus acoroides, Thalassia hemprichii dan Cymodocea rotundata where found in Sumberkima Beach. Epifauna density in Sumberkima range between 933.33 ind/m3 – 2400.00 ind/m3. Meanwhile, epifauna density in Karang Sewu range between 1311.11 ind/m3 – 2544.44 ind/m3. The epifauna that is mostly encountered is Smaragdia rangiana. Correlation analysis result using the Pearson Product Moment shows a positive correlation between epifauna and seagrass density, r = 0.55, which means that there is enough relation between both variables. The epifauna community has a variety value of 1.60 – 2.19 in Sumberkima, and 1.26 – 2.14 in Karang Sewu, which both count as moderate. The uniformity values 0.74 – 0.96 in Sumberkima and 0.65 – 0.85 in Karang Sewu, which both count as high. Dominance value range from 0.14 – 0.28 in Sumberkima and 0.17 – 0.42 in Karang Sewu, which count as low. Overall, the epifauna community is classified as moderate, where if there is a change in the environment, the community will quickly change too.
Pengaruh Suhu Permukaan Laut Musiman terhadap Produksi Penangkapan Ikan Lemuru (Sardinella lemuru) di Perairan Selat Bali, Maret 2011 – Februari 2015 A. A. Md. Ananda Putra Suardana; I Dewa Nyoman Nurweda Putra; 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.p08

Abstract

Lemuru fishing activity in the Bali Strait is the most dominant fishery sector in that waters. One of the environmental factors that affect lemuru is Sea Surface Temperature (SST) spread seasonally. One Remote Sensing technology that can be used in determining the value of the distribution of SST is Moderate Resolution Imaging Spectroradiometer (MODIS). This study aimed to explore the influence of SST on the production of lemuru fishing (Sardinella lemuru) in the waters of the Bali Strait each seasonally. The method used in this research is descriptive qualitative by look influence between SST seasonally to the production of lemuru fishing at Bali Strait. This study used correlation and regression polynomial equation. The results showed influence of SST seasonally to the production of lemuru fishing in west season amounted to 54.86% (proportional), in east season by 43.88% (inversely), in the transitional seasons I amounted to 37.05% (proportional), and on the intermediate season by 30.64% (proportional). The weak impact of SST on the production of lemuru fishing in the waters of the Bali Strait in every season caused by state of the SST is relatively constant, while the production of fishing lemuru in annually increasing.
Efektivitas Alat Tangkap Jaring Insang Hanyut pada Ikan Tongkol (Euthynnus sp.) diPerairan Seraya Timur, Bali I Wayan Juliantara Putra; Elok Faiqoh; Widiastuti Widiastuti
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.p13

Abstract

Tongkol fish (Euthynnus sp.) common types of fish resources found in the waters of Bali, especially Karangasem. Fishermen in Seraya Timur Village, Karangasem Regency, use drift gill nets to catch Tuna Fish. The use of drift gill nets is still very simple with the size of the mesh used that is also still diverse, but most use a mesh size of 2 and 2.5 inches. The use of drift gills by fishermen in the village of East Seraya is still very simple and the mesh nets used are also still diverse, but generally use mesh sizes of 2 and 2.5 inches. Therefore, it is necessary to know the level of effectiveness of each of the mesh sizes. The purpose of this study was to determine the amount of tuna fish catch using drift gill nets and the effectiveness of the two mesh sizes in the Seraya Timur waters. This study uses gill drift nets with 2 and 2.5 inch mesh sizes. The number of settings (decrease in net) and haulling (removal of the net) was carried out 22 times in March 2019. The results showed that the total number of catches with a 2 inch mesh size was relatively twice as high as the 2.5 inch mesh. It can be concluded that the net size of 2 inches has a smaller effectiveness compared to 2.5 inch mesh size.
Laju Pertumbuhan dan Tingkat Kelangsungan Hidup Karang Transplan Acropora hyacinthus pada Ukuran Fragmen yang Berbeda Widiastuti Widiastuti; Awalludin Ponco Aji Handoyo; 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.p04

Abstract

Coral transplantation is an alternative way to maintain coral reef ecosystems sustainability. A. hyacinthus is one of the main reef builder and export commodities for decorative aquarium. Determining the initial size of coral fragments may create efficiency and effectiveness of transplantation. This study aims to examine the effects of different initial fragment lengths on growth, growth rate and survival rate of Acropora hyacinthus. Six colonies were fragmented to three initial lengths (30, 50 and 70 mm), where it was measured for 12 weeks. Growth rates were obtained every two weeks while survival rates were calculated amount of living fragments at the end of the observation substracted by the amount of living fragments at the beginning of the observation. The effects of different initial lengths were analysed using Tukey HSD two-way ANOVA and when parametric statistics asumptions did not meet, it was analysed using a non parametric statistic test. Thus the significant results were followed by Tukey HSD. The results showed that different initial fragment lengths had significant effect on the growth of length (p = 0.000), however there was no significant difference in diameter growth (p = 0.662). The lowest length growth rate was found at initial length 30 mm and the highest was at 70 mm long. In contrast, the lowest diameter growth rate was found 70 mm and the highest was at 30 mm long. The survival rates of different initial fragment lengths of fragmented reached 100% at all lengths.
Distribusi Spasial Klorofil-A di Perairan Teluk Benoa Bali I Putu Gede Bayu Ade Wianta; 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.p09

Abstract

Benoa Bay is an estuary that gets input of waste and nutrients from six rivers and inderectly influenced water productivity in Benoa Bay. The nutrients flow from the river to domestic, industrial, and agricultural activities into Benoa Bay. The amount of nutrient inputs accumulated in Benoa Bay this could affect the chlorophyll-a consentrations. The purpose of this study was to determine the spatial distribution and influence nitrate and phosphate on chlorophyll-a concentration. Water surface sampling carried out on February 2019. The method used was purposive sampling and chlorophyll-a concentration was analysed using spectrophotometer Shimadzu UV-2600, based on the maximum absorption of four wavelengths (quadrichroic). The results showed that the chlorophyll-a concentration ranged from 0.22 - 8.53 g/m3 with an average of 5.58 g/m3. Nitrate concentration ranged from 0,004 - 0,180 mg/L with an average 0,107 mg/L. Phosphate concentration ranged from 0,005 - 0,229 mg/L with an average 0,101 mg/L. Spatial distributions of chlorophyll-a concentration in Benoa Bay higher in the estuary area compare to sea area. The different concentration of chlorophyll-a in Benoa Bay were affected by physical and biological processes. The result of statistic regression of the nitrate and phosphate influence on chlorophyll-a concentration in Benoa Bay was 39,2% (R² = 0.392) for nitrate, meanwile 20,5% (R² = 0.205) for phosphate.
Pertumbuhan dan Tingkat Kelangsungan Hidup Donor Transplan Karang Acropora hyacinthus Berdasarkan Ukuran Panjang Awal Fragmen yang Berbeda AAK Aswan Deva; I Gusti Ngurah Putra Dirgayusa; Widiastuti Widiastuti
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.p14

Abstract

Coral reefs play significant roles in both aspects of ecology and economy. However its status in Indonesian reefs is mainly moderate to poor condition. One of the alternative way to rehabilitate the damaged coral reef is coral transplantation. Acropora hyacinthus is one of export comodities for ornamental aquarium and important component of reef builder organisms. Studies showed that fragmentation causes stress on the coral donor as indicated by the excessive mucus production which in turn may affect the survival of the coral donors. This study aims to determine the growth and survival rates of donors based on the initial fragment sizes. A total of 5 coral donors of A. hyacinthus with relatively similar branch were fragmented into initial sizes of 30, 50 and 70 mm and the rests were controls. The growth was indicated by the increase in length which measured every two weeks for 12 weeks. The results showed that the absolute growth of coral donors were significantly different among initial sizes. The survival rate in the initial length of 30 mm (100%) was higher than those in 50 mm (80%) and 70 mm (80%).
Keragaman Genetik Ikan Tongkol Abu-Abu (Thunnus tonggol) yang Didaratkan di Pasar Ikan Sagulung, Batam, Kepulauan Riau Berdasarkan DNA Mitokondria Suryany Devy; Ida Ayu Astarini; I Nyoman Giri Putra; Andrianus Sembiring; Luh Astria Yusmalinda; M. Danie Al Malik; Ni Putu Dian Pertiwi
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.p06

Abstract

Longtail Tuna (Thunnus tonggol) is one of the neritic species of tuna from the Scrombridae family. T. tonggol is oceanicromus and ussually found in tropical and subtropical waters in the Indo-Pacific region. Although known as one of the tuna species, the information of this species is very lacking, especially in Indonesia. Therefore, this study aims to determine the genetic diversity and kinship relationships of longtail tuna (T. tonggol) collected at Sagulung fish market, Batam, Riau Islands. Molecular analysis were carried out using genetic markers namely mitochondrial D-loop (control regian) with the stages of DNA extraction, PCR (Polymerase Chain Reaction), electrophoresis, sequencing, and data analysis. A total of 21 longtail tuna samples were identified using molecularly and confirmed as T. tonggol species, which have a base length ranging from 482 - 523 bp (base pairs). The value of haplotype diversity (Hd) of longtail tuna was 1,00000 and the value of nucleotide diversity (?) was 0,01654. The results of phylogenetic tree reconstruction showed that all samples collected were in the same group (clade) with the average genetic distance in one T. tonggol clade obtained a value of 0.010 which has a close relationship between samples. This result can be use as additional information for longtail tuna species in Indonesia.

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