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Eleven years consecutively coral reef rehabilitation in Tobok Batang, Bontang Prabuning, Derta; Simarangkir, Omega Raya; Prinanda, Muhammad Naufal; Prasetyo, Dimas; Nurcahaya, Nurcahaya; Nasoetion, Fawzia
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 13, No 1 (2024): APRIL 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.1.33076

Abstract

Coral reefs in Tobok Batang, a nearby estuary of Bontang Regency, have a vital role in the threatened ecosystem due to non-environmental-friendly fishing practices and a global threat in the form of coral bleaching. In response to these conditions, PT Pupuk Kalimantan Timur initiated the Kilau Samudera Program to support damaged coral reef recovery through community-based rehabilitation by developing and maintaining artificial reef modules. The study objective was, therefore, to determine the rehabilitation efficacy in Tobok Batang, through (1) coral growth informed by colony diameter, and (2) targeted reef fishes informed by abundance and biomass. Data was collected by purposive sampling in eleven clusters of three modules: pyramid, dome, and cube. The result shows that coral had been found attached in all these eleven clusters, while the targeted fishes had been found in most clusters. Clusters deployed in 2015 and 2017 have an average colony diameter of 30 cm (SE), the two highest among the other clusters. The highest abundance of corallivores was found in the cluster deployed in 2017 and 2020 (9 ind/100 m2). The highest herbivore abundance also was found in the cluster deployed in 2017 and 2020 (23 ind/100 m2), while its highest biomass was found in cluster 2020 only (40 kg/100 m2). The highest carnivore abundance was found in cluster 2017 only, with four fish per 100 m2 as well as the biomass in the same cluster (9kg/100 m2). All these cluster groups have provided new habitats in shallow waters, indicating that the cluster has a good position and probably good material composition that can trigger coral juveniles to attach, settle, and grow, which also became a unique habitat for some targeted reef fish. This study showed that the location and these three modules were proven effective for rehabilitating methods in damaged coral reefs.Keywords:Coral Reef,Rehabilitation,Tobok Batang,Bontang,Reef Fish
Eleven years consecutively coral reef rehabilitation in Tobok Batang, Bontang Prabuning, Derta; Simarangkir, Omega Raya; Prinanda, Muhammad Naufal; Prasetyo, Dimas; Nurcahaya, Nurcahaya; Nasoetion, Fawzia
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 13, No 1 (2024): APRIL 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.1.33076

Abstract

Coral reefs in Tobok Batang, a nearby estuary of Bontang Regency, have a vital role in the threatened ecosystem due to non-environmental-friendly fishing practices and a global threat in the form of coral bleaching. In response to these conditions, PT Pupuk Kalimantan Timur initiated the Kilau Samudera Program to support damaged coral reef recovery through community-based rehabilitation by developing and maintaining artificial reef modules. The study objective was, therefore, to determine the rehabilitation efficacy in Tobok Batang, through (1) coral growth informed by colony diameter, and (2) targeted reef fishes informed by abundance and biomass. Data was collected by purposive sampling in eleven clusters of three modules: pyramid, dome, and cube. The result shows that coral had been found attached in all these eleven clusters, while the targeted fishes had been found in most clusters. Clusters deployed in 2015 and 2017 have an average colony diameter of 30 cm (SE), the two highest among the other clusters. The highest abundance of corallivores was found in the cluster deployed in 2017 and 2020 (9 ind/100 m2). The highest herbivore abundance also was found in the cluster deployed in 2017 and 2020 (23 ind/100 m2), while its highest biomass was found in cluster 2020 only (40 kg/100 m2). The highest carnivore abundance was found in cluster 2017 only, with four fish per 100 m2 as well as the biomass in the same cluster (9kg/100 m2). All these cluster groups have provided new habitats in shallow waters, indicating that the cluster has a good position and probably good material composition that can trigger coral juveniles to attach, settle, and grow, which also became a unique habitat for some targeted reef fish. This study showed that the location and these three modules were proven effective for rehabilitating methods in damaged coral reefs.Keywords:Coral Reef,Rehabilitation,Tobok Batang,Bontang,Reef Fish
Status of Coral Reef Benthic Cover in the Gili Balu Marine Conservation Area, Sumbawa, West Nusa Tenggara Himawan, Mahardika Rizqi; Santana, Lalu Bagus; Lestariningsih, Wiwid Andriyani; Hidayatullah, Rahmat; Prabuning, Derta
Jurnal Biologi Tropis Vol. 24 No. 2b (2024): Special Issue
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v24i2b.8077

Abstract

The coral reef ecosystem in Indonesia boasts the highest biodiversity and serves as the center of the Coral Triangle's diversity. Despite its richness, Indonesia's coral reefs face increasing threats from various factors, primarily anthropogenic. Regular biophysical surveys of coral reef ecosystems are therefore necessary to monitor their current conditions and guide management efforts. This study aimed to assess the condition of coral reefs by examining the percentage of coral cover in the Gili Balu Marine Conservation Area, Sumbawa NTB. The research was conducted in January, 2022, using the Point Intercept Transect (PIT) method at 10 observation points. The transects measured 50 meters in length and were repeated three times at each location. The results indicated that the coral reefs were in good condition at the South Belang Island Station (57%) and West Pasareang Island (69.67%), according to Kepmen LH No. 4/2001. However, moderately damaged reefs were observed at North Belang Station (38%), Kenawa Island (30%), East Belang Island (30%), and Mandiki Island (28.67%). Coral reefs classified as severely damaged were found at Southwest Namo Island Station (17.33%), North Pasareang (16.67%), South Kalong (11%), and North Namo (9.67%). Overall, the dominant condition of coral reefs in the Gili Balu Conservation Area was categorized as moderately to severely damaged. Conservation efforts, including protection in areas with good conditions and rehabilitation in damaged areas, are recommended as follow-up actions to support coral reef sustainability in Gili Balu.
Kelimpahan dan Biomassa Ikan Karang di Kawasan Konservasi Perairan Gili Balu, Kabupaten Sumbawa, Nusa Tenggara Barat Himawan, Mahardika Rizqi; Hidayatullah, Rahmat; Prabuning, Derta; Lestariningsih, Wiwid Andriyani
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 2 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i2.656

Abstract

The Gili Balu Marine Conservation Area (KKP), located in Sumbawa Regency, West Nusa Tenggara, is ecologically and economically significant due to its rich coral reef ecosystems. This research aims to measure the abundance and biomass of reef fish in the KKP Gili Balu, which can be used as a basis for evaluating the effectiveness of conservation efforts in maintaining marine biodiversity. The Underwater Visual Census (UVC) method was used, recording types of reef fish at ten observation points. The results showed that the highest abundance was found on Mandiki Island, with functional fish abundance reaching 2973 ind/ha, followed by Pasareang Barat Island (1903 ind/ha) and South Kalong (1600 ind/ha). The biomass of functional fish also reflects their important role in maintaining the balance of the coral reef ecosystem. This research contributes to the scientific understanding of marine biodiversity in the KKP Gili Balu and provides a basis for sustainable conservation management efforts. Additionally, the research recorded the presence of several coralivorous and economically important fish species, although they tend to be smaller compared to functional fish. Economically important fish in the KKP Gili Balu waters were found only at four observation locations: East Belang Island, North Belang, Kenawa, and Southwest Namo. The highest value was recorded at Kenawa Island, with 93 ind/ha. These fish tend to be rare in this area, possibly due to past fishing practices.