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All Journal Jurnal Ilmu Kelautan Spermonde Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Sawala : Jurnal pengabdian Masyarakat Pembangunan Sosial, Desa dan Masyarakat
Hidayat, Esa Fajar
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Religion Arts Earth & Planetary Sciences Education Environmental Science Health Professions Medicine & Pharmacology Public Health Social Sciences

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Journal : Jurnal Ilmu Kelautan Spermonde

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DISTRIBUTION OF PELAGIC FISH IN SOUTH CHINA SEA USING GEOSTATISTICAL APPROACH Hidayat, Esa Fajar; Pujiyati, Sri; Suman, Ali; Hestirianoto, Totok
Jurnal Ilmu Kelautan SPERMONDE VOLUME 4 NUMBER 1, 2018
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/jiks.v4i1.3800

Abstract

Pelagic fish are spesies that live in water column at depth of 100 to 200 meters from surface. They migrate as a group looking for nutrient and spawning place. Potential fisheries comodities in Indonesia including pelagic fish have high economic value. Then, stock assessment of pelagic fish measurement is important to researched. The research was conducted in May – June 2016 surrounding South China Sea waters using Madidihang 02 Research Vessel operated by Marine Fisheries Affair (MFA) Republic of Indonesia. To estimate the density of pelagic fish hydro-accoustic equipment and oceanography parameters were used and measured during the campaign. The split beam echosounder was use in aim to obtain precission position and number of fish target. The highest density of fish was found around Tambelan Island and Anambas Island. Statistically pelagic fish density has correlation with chlorophyll-a, salinity, temperature, and sea current velocity. The statistical analysis between pelagic fish density and those oceanography parameters (as statistic variables) yields positive vector correlation.
SPATIAL MAPPING OF CORAL REEF DISTRIBUTION IN KARIMUNJAWA ISLAND USING LYZENGA ALGORITHM Hidayat, Esa Fajar; Hanafi, Faisal; Purwanto, Hery; Noraini, Alifah; Marsela, Kristina; Dewi, Atika Kumala; Lubis, Muhammad Zainudin
Jurnal Ilmu Kelautan SPERMONDE VOLUME 11 NUMBER 1, 2025
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35911/jiks.v11i1.44241

Abstract

Coastal areas have high ecosystem productivity and are characterized by abundant fish species and coral reefs. However, these ecosystems are vulnerable to environmental pressures caused by human activities and natural dynamics. Coral reefs, consisting of organisms from the class Anthozoa within the order Scleractinia, which produce calcium carbonate structures, are key indicators of coastal ecosystem health. Coral reefs share biological characteristics with soft corals, hydras, and sea anemones as part of the phylum Cnidaria. Their existence is highly sensitive to environmental changes, whether natural or anthropogenic. In Indonesia, coral reef conditions have experienced significant degradation, with 36.18% in the damaged condition, only 6.56% categorized as very good, and 22.96% as good. The remaining 34.3% fall under the poor category, particularly around Karimunjawa and Kemujan Islands. Accurate data-based monitoring and management are essential for conserving these ecosystems. One method used to map and analyze coral reef distribution is the Lyzenga algorithm, which can distinguish shallow-water characteristics from coral reef habitats using satellite imagery. In this study, the Lyzenga algorithm was applied to SPOT 6 imagery for the Karimunjawa and Kemujan regions, covering an area of 8.46 km². The results showed that live coral reefs cover approximately 46% of the area, while dead coral reefs account for 56%, indicating a level of degradation that requires further attention in conservation and ecosystem recovery strategies. This study highlights the critical state of coral reefs in Indonesia, particularly in the Karimunjawa and Kemujan regions, emphasizing the necessity for conservation efforts driven by precise monitoring techniques such as the Lyzenga algorithm.
Co-Authors Adhitama, Gregorius Prasetyo Ali Suman Alifah Noraini Atika Kumala Dewi, Atika Kumala Hanafi, Faisal Haq, Sansan Ziaul Hery Purwanto Hestirianoto, Totok Kurniash, Nia Lubis, Muhammad Zainudin Marsela, Kristina nia kurniasih Nuriman, Harry Prima Roza Simarmata, nirmawana Sri Pujiyati Triyadi Guntur Wiratmo