Jurnal Ilmu dan Teknologi Kelautan Tropis

Estimation of Total Suspended Solids in the Ujung Pangkah Estuary Using Multi-Temporal Sentinel-2 Satellite Imagery

2025-03-03T13:59:39+07:00

Keberadaan material terlarut dalam air, khususnya Total Suspended Solids (TSS), berpengaruh signifikan terhadap sifat optik air laut. Fenomena ini dapat diamati secara kuantitatif melalui teknik penginderaan jauh, yang memerlukan berbagai algoritma untuk mengonversi nilai reflektansi piksel menjadi konsentrasi TSS. Penelitian ini memiliki dua tujuan utama: (1) memperkirakan dan memetakan konsentrasi TSS menggunakan citra satelit multitemporal Sentinel-2 serta (2) membandingkan beberapa algoritma estimasi TSS dengan menganalisis data citra terhadap pengukuran in situ. Citra Sentinel-2 dari tahun 2020 hingga 2022 digunakan dalam penelitian ini, dan konsentrasi TSS dihitung menggunakan tiga algoritma: Liu, Budiman, dan Prasetyo. Hasil estimasi TSS dari citra satelit divalidasi dengan data lapangan dari 25 titik sampel. Akurasi estimasi diuji menggunakan parameter Root Mean Squared Error (RMSE) dan Mean Absolute Percentage Error (MAPE). Hasil pengukuran in situ menunjukkan bahwa konsentrasi TSS di wilayah penelitian berkisar antara 24 hingga 127 mg/L. Algoritma Liu dan Budiman menghasilkan estimasi TSS dengan standar deviasi tertinggi, sedangkan algoritma Prasetyo menunjukkan deviasi yang lebih rendah, menghasilkan estimasi yang lebih akurat. Validasi statistik mengonfirmasi bahwa algoritma Prasetyo memiliki keakuratan tertinggi dalam memperkirakan TSS in situ (RMSE = 10,75, MAPE = 3,97%, R² = 0,85). Hasil penelitian ini menegaskan efektivitas penginderaan jauh dalam pemantauan TSS serta pentingnya pemilihan algoritma yang tepat untuk penilaian kualitas air yang akurat.

Kondisi Terumbu Karang dan Ikan Karang di Pulau Maitara Selatan, Kota Tidore Kepulauan

2025-03-03T14:30:44+07:00

South Maitara is part of Maitara Island, rich in natural resources, particularly coral reefs and reef fish. This ecosystem plays a crucial role in supporting the local economy, both through fisheries and tourism. Therefore, maintaining its sustainability is essential to ensure long-term benefits for the community. This study aims to assess the condition of coral reefs and reef fish in the waters of South Maitara. The research was conducted in April 2024, utilizing the Line Intercept Transect (LIT) method along a 50-meter transect for coral data collection and the Visual Census method at an 8-meter depth for reef fish assessment. The findings indicate that the coral reef condition in the study area is categorized as poor, with only 17% live coral cover and 66% dominated by coral rubble. The visual census recorded 80 major fish species from 6 families, 8 indicator fish species from the Chaetodontidae family, and 50 target fish species from 3 families. The fish abundance index ranged from 0.03 to 0.32, the diversity index from 0.17 to 0.37, and the uniformity index from 0.2 to 0.4. These results highlight the significant pressure on coral reefs and associated marine organisms in South Maitara. Therefore, conservation efforts and sustainable management strategies are crucial to preserving the ecological balance and ensuring the continued economic and environmental benefits of this ecosystem.

Identifikasi Variabilitas Suhu Permukaan Laut dan Klorofil-a Lombok Strait pada Triple-Dip La Niña 2020-2022

2025-03-03T14:49:00+07:00

The La Niña phenomenon often causes significant changes in sea surface temperature and deep-sea ecosystem dynamics in the context of global climate change. This study focuses on the impact of the 2020–2022 Triple-Dip La Niña in the Lombok Strait, which potentially affects maritime biological equilibrium. The research aims to identify and understand the variability of Sea Surface Temperature (SST) and chlorophyll-a concentrations during the Triple-Dip La Niña period. The study utilizes Sea Surface Temperature (SST) and chlorophyll (chlor_a) data from the Aqua-MODIS satellite, as well as wind direction and speed data in the form of Windrose diagrams in Mataram, West Nusa Tenggara, from 2020 to 2022, with a three-month interval to examine the variability in SST and chlorophyll-a concentrations. Statistical approaches, including correlation coefficient calculations, were applied to determine the relationships between variables. It was found that the highest temperature occurred in 2020, while the highest chlorophyll-a concentration was also recorded in the same year, particularly in coastal areas where the sea surface temperature was relatively lower than the surrounding areas. The results indicate a weak correlation between chlorophyll-A and SST in the Lombok Strait region.

Analisis Kelayakan Air Laut untuk Wisata di Pantai The Legend-Pamekasan Berdasarkan Kelimpahan Bakteri Escherichia coli dan Konsentrasi Bahan Organik Total

2025-03-03T14:51:23+07:00

The Legend Beach-Pamekasan is a tourist destination surrounded by five monitoring stations, where contamination by Escherichia coli bacteria has been detected. This bacterium can proliferate rapidly in aquatic environments when sufficient nutrients, particularly total organic matter, are present. Therefore, this study aims to assess the suitability of The Legend Beach-Pamekasan for tourism based on E. coli abundance and to analyze the relationship between total organic matter concentration and E. coli abundance at the study site. Bacterial abundance was determined using the membrane filtration method following ISO 9308-1:2014, while total organic matter content was analyzed based on SNI 06-6989.22-2004. The results indicate that E. coli abundance at Station 7 (The Legend Beach-Pamekasan) falls within the safe threshold for recreational beach use at 30 CFU/mL. However, swimming and snorkeling activities are not recommended in the surrounding waters, as E. coli levels at Station 1 (estuary) and Station 3 (fish-washing waste area) exceed the quality standard threshold established by Republic of Indonesia Government Regulation No. 22 of 2021. A significant correlation was found between total organic matter concentration and E. coli abundance across all stations (ρ = 0.01, p < 0.05). These findings highlight the need for effective waste management strategies in the area to prevent further contamination and ensure the long-term sustainability of The Legend Beach-Pamekasan as a safe and viable tourism destination.

Sebaran Spasial Plankton dan Klorofil-a sebagai Indikator Penentuan Daerah Potensial Penangkapan Ikan di Perairan Gili Trawangan

2025-03-04T10:06:51+07:00

A high abundance of plankton serves as an indicator of water fertility and can be used to identify potential fishing grounds. Fishing grounds are determined by analyzing the presence and density of fish schools in a given area. This study aims to assess the spatial distribution of phytoplankton, zooplankton, and chlorophyll-a to identify potential fishing zones. The research was conducted in March 2024 in Gili Trawangan, covering 12 sampling stations. Sampling locations were selected using a purposive sampling method based on water characteristics, prioritizing areas with high plankton and chlorophyll-a concentrations. The results indicate that the southern waters of Gili Trawangan, particularly Stations 03 and 05, have strong potential as fishing zones due to their high phytoplankton, zooplankton, and chlorophyll-a concentrations. Similarly, Station 09 in the eastern waters exhibits the highest abundance of all parameters; however, its proximity to the harbor makes it unsuitable for fishing activities. Overall, Gili Trawangan meets the criteria for a viable fishing ground due to the high abundance of plankton species, which serve as a primary food source for fish. The dominant plankton species in these waters include Coscinodiscus sp., Rhizosolenia sp., and Nauplius sp.. A higher plankton abundance correlates with increased water productivity, leading to greater fish availability in these waters.

Analisis Hubungan Kondisi Ekosistem Mangrove terhadap Produksi Ikan di Kawasan Konservasi Perairan Kayong Utar

2025-03-04T11:16:31+07:00

The North Kayong Regency Marine Conservation Area serves to protect and sustainably utilize fishery resources, including penaeid shrimp, porpoises, and mangrove ecosystems. Effective management requires spatial data on conservation targets to support comprehensive planning and evaluation. This study analyzes the relationship between the mangrove vegetation index (NDVI), derived from satellite imagery, and fish production in the conservation area using a mangrove productivity approach. The research comprises four stages: (i) analysis of fish stock and production using the mangrove productivity model, (ii) correlation analysis between fish production and mangrove conditions, (iii) measurement of physicochemical water parameters, and (iv) correlation analysis between physicochemical water factors and fish production. The results indicate that the average daily mangrove litterfall production across all stations is 2.09±0.86 g dry weight/m²/day or 8.42±3.47 tons/ha/year, while fish production ranges from 190.17 to 690.28 kg/ha/year, with an average of 448.82±185.61 kg/ha/year. A moderate positive correlation is observed between NDVI and fish production (r = 0.51), whereas Dissolved Oxygen (DO) and Total Suspended Solids (TSS) exhibit a negative correlation with fish production (r = -0.65 and -0.57, respectively). These findings underscore the crucial role of mangrove ecosystems in supporting fishery productivity. Therefore, strengthening mangrove conservation efforts is essential to maintaining ecosystem balance and ensuring the sustainability of fishery resources.

Identifikasi Spesies Ikan Pembersih pada Pari Manta Karang (Mobula alfredi) di Cleaning Stations Manta Sandy, Selat Dampier, Raja Ampat

2025-03-04T12:22:56+07:00

Cleaner fish are specialized fish species that coexist with other marine organisms by removing parasites and debris from their bodies. These fish play a crucial role in maintaining the health of various marine species, including reef manta rays (Mobula alfredi). However, a limited understanding of their interactions presents a significant challenge in marine conservation. This study aims to identify the species of cleaner fish that interact with reef manta rays (M. alfredi) at Manta Sandy, Dampier Strait, Raja Ampat. A modified camera trap method was employed, utilizing three GoPro cameras strategically placed at different locations within the study site. Data collection was conducted over 14 days in February 2023 to document cleaner fish interactions with reef manta rays. The findings revealed the presence of three cleaner fish species at the Manta Sandy Cleaning Station: Labroides dimidiatus, Thalassoma lunare, and Chaetodon kleinii. This study highlights the diversity of cleaner fish species at Manta Sandy, contributing valuable insights into their ecological roles and conservation significance. The findings serve as a crucial reference for future research on marine biodiversity conservation in Raja Ampat and surrounding regions.

Estimasi Kesuburan Perairan Teluk Lampung berdasarkan Vertically Generalized Production Model (VGPM)

2025-03-10T12:44:23+07:00

Lampung Bay is an important water crossing in South Sumatra that is greatly influence by anthropogenic activities and oceanographic characteristics. This study characterized and estimated the spatial and temporal Primary Productivity (PP) in the three sections of the bay: head, middle, and mouth. The PP was modeled by using Sea Surface Temperature (SST), chlorophyll-a, Primary Productivity, and Photosynthetically Active Radiation (PAR) collected from remote sensing data and field measurements. Primary productivity was modeled with a Vertically Generalized Production Model (VGPM), and data validation was done using the Root Mean Square Error method. The distribution of PAR in Lampung Bay ranged from 35–52.50 E/m2/day. The distribution of SST ranged from 28.5–31.50°C. The highest distribution of chlorophyll-a was at the hHead of the bay with a range of 0.30-12 mg/m3. Correlation analysis shows that chlorophyll-a had the highest influence on PP (R2=0.99). While the middle and outer areas of the bay have a low average with values of 122.65 and 101.84 gC/m2/year. Our models show that there is high primary production at the Head of the bay, reaching eutrophic and mesotrophic levels. The middle and outer areas of the bay show productivity levels corresponding to mesotrophic and oligotrophic levels.

Peluang Bisnis dan Sumber Gizi Hewani dari Perikanan Produk Ikan Tangkap Lestari Kabupaten Buton Utara

2025-03-04T12:38:54+07:00

Indonesia's capture fisheries hold significant potential to boost the seafood industry and reduce stunting, which affected 21.6% of children in 2022. Low consumption of marine-derived animal protein, averaging less than 10 grams/day, contributes to this public health issue despite an annual fishery potential exceeding 10 million tons. This untapped resource presents opportunities to process species like skipjack and tuna to meet local needs and global demand, which reached 180.07 million metric tons. This review highlights North Buton’s fishery resources as a driver of economic and nutritional value. Developing processed seafood products for local and international markets requires compliance with food safety standards and regulatory guidelines. Collaboration among government bodies, researchers, fisher groups, and NGOs is essential to design sustainable programs and address sectoral challenges. Adopting sustainable fisheries management — emphasizing selective fishing and Optimum Sustainable Yield (OSY) — preserves marine resources while benefiting communities. Implementing Indonesian National Standards (SNI) in post-harvest processes can improve product quality, extend shelf life, and elevate economic returns, supporting national goals to enhance nutrition and public health.