Kondisi Terumbu Karang Di Kepulauan Seribu Dalam Kaitan Dengan Gradasi Kualitas Perairan   &lt;Br&gt;&lt;I&gt;[Water Quality Gradation Of Coral Reef At Seribu Island]&lt;I&gt;

Purnomo, Pujiono Wahyu; Ruswahyuni, Ruswahyuni

doi:10.20473/jipk.v1i1.11704

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…Algae can also compete for coral growth, thereby inhibiting growth in height, and their growth tends to be sideways (McCook et al 2001). Changes in reef profile and zooxanthella density are also affected by nutrient enrichment (Ruswahyuni and Purnomo 2009).…”

Section: Resultsmentioning

confidence: 99%

The Conditions of Coral Reef Ecosystem on Seureudong Island, South Aceh

Darmarini,

Nurul Najmi,

Eka Lisdayanti

et al. 2023

JPSL

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The coral reef ecosystem on Seureudong Island, Sawang Bau Village, Sawang District, South Aceh is very important for the surrounding ecosystem, with the fringing reef type, namely the shape of its growth around the island. This study aims to determine the current condition of coral cover and the types available on Seureudong Island. The method used is the Point Intercept Transect (PIT). The results showed that the forms of coral found at the study site were branching, digitate, encrusting, foliose, massive, mushroom, plates, and submassive. The percentage of the bottom substrate is dominated by hard coral (hard coral) at 45.3%, Dead Coral with Algae/DCA (37.11%), and (9.89%), rubble of 3.56%, rock (1.56%), algae turf (1.44%), macroalgae (1%) and dead coral (0.11%). At the study site, 25 genera were found with Porites (36%) as the most common genus found. At the research location, there are also genera with a total presence of less than 1%. These genera are Acanthastrea, Ctenactis, Favia, Favites, Fungia, Gardineroseris, Goniopora, Halimeda, Heliopora, Hydnophora, Leptastrea, Montastrea, Pavona, and Seriatopora. The quality of the waters at the research location still complies with the standards of coral life. The results of these observations must be carried out periodically so that they can always update the condition of the coral reefs on Seureudong Island

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Section: Resultsmentioning

confidence: 99%

The Conditions of Coral Reef Ecosystem on Seureudong Island, South Aceh

Darmarini,

Nurul Najmi,

Eka Lisdayanti

et al. 2023

JPSL

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“…The soil type on Lancang Island is coral sand formed from the weathering of coral rocks, characterized by a bright, grayish-white, and loose texture (Elson et al, 2022). The waters surrounding Lancang Island are renowned for their hard coral reefs, playing a crucial ecological and economic role by sustaining diverse aquatic life at various life stages and contributing to high fish diversity (Purnomo and Ruswahyuni, 2009). Unfortunately, the ecological condition of these coral formations has been adversely affected by pressures originating from Java Island (Sachoemar 2008).…”

Section: Introductionmentioning

confidence: 99%

Acoustic Detection and Quantification of Fish in Lancang Waters of Seribu Islands, Indonesia

Purnawan,

Manik,

Manik

et al. 2024

Indo. J. Mar. Sci.

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Sound propagates effectively through the water column, establishing hydroacoustic technology as a premier method for underwater exploration, including the mapping of aquatic ecological resources. While the fisheries sector is considered pivotal in aquatic resource studies, mapping fisheries remains challenging due to the distinct distribution patterns exhibited by fish within the water column, which are intricately linked to their habitat preferences. In this study, the hydroacoustic method was employed to analyze the distribution of fish in the waters surrounding Lancang Island, Seribu Islands, Jakarta. This analysis utilized the target strength (TS) value alongside oceanographic parameters. Acoustic data was collected using a 200 kHz single beam echosounder based on parallel transects encircling the waters of Lancang Island. CTD was utilized to collect oceanographic data to acquire temperature and salinity profiles within the water column. The acoustic data processing was conducted using the post-processing software SONAR 5-pro. The analysis was performed based on acoustic cells, obtained by dividing segments every 100 m horizontally and layers every 5 m vertically, thereby obtaining the Target Strength per cell (TSc) and volume backscattering strength (SV) values from each cell. The results showed that the highest average TSc value was found in the depth range of 26-31 m at -46.98 dB, and the highest SED biomass was also found in the same depth range at 26.6 kg.ha-1. Based on the analysis of water temperature and salinity, it was found that these factors significantly influence the distribution of fish in the waters of Lancang Island (R-square= 0.1276 and P< 0.05). This finding also indicates the presence of other parameters affecting fish distribution in Lancang waters, with the type of substrate and habitat emerging as potential determining factors, notably in coral reef environments.

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Assessment of Target Strength Value of Demersal Fish in Lancang Waters Using Simrad Single Beam Echosounder

Purnawan

Elson

Manik

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Hydroacoustic technology is excellent at determining accurately and in near real-time the objects located near the seabed. Therefore, acoustic technology is widely recognized for fisheries resources mapping, including demersal fish. The objective of this study was to estimate the value of demersal fish target strength (TS) in the waters of Lancang Island, Kepulauan Seribu region. A Single Beam Echosounder Simrad EK-15 with a frequency of 200 kHz was employed for data collecting in the waters around Lancang Island. The integration layer width was set at 3 meters with a horizontal integration distance of 200 meters. The average target strength (TSc) values obtained from the integration cell ranged from -55.52 dB to -42 dB with an average of -50.30 dB. Furthermore, the seabed depth influenced the distribution of TSc values, with higher TSc values in deeper habitat locations.

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Kondisi Terumbu Karang Di Kepulauan Seribu Dalam Kaitan Dengan Gradasi Kualitas Perairan <Br><I>[Water Quality Gradation Of Coral Reef At Seribu Island]<I>

Cited by 4 publications

References 1 publication

The Conditions of Coral Reef Ecosystem on Seureudong Island, South Aceh

The Conditions of Coral Reef Ecosystem on Seureudong Island, South Aceh

Acoustic Detection and Quantification of Fish in Lancang Waters of Seribu Islands, Indonesia

Assessment of Target Strength Value of Demersal Fish in Lancang Waters Using Simrad Single Beam Echosounder

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