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Potential Fishing Grounds for Large Pelagic Fish during the Eastern and Transitional Seasons in Pangandaran Waters, West Java, Indonesia

100%
Yuliadi L. P. S., Wiratama R. N., Izzah N.
World News of Natural Sciences
|
2025
|
vol. 62
215-227
EN
Pangandaran is one of the fish landing centers in West Java, Indonesia. Migration, distribution, and abundance of pelagic fish are influenced by several oceanographic parameters such as sea surface temperature and chlorophyll-a concentration. This study was conducted to map the fishing grounds of large pelagic fish in Pangandaran Sea during the eastern and transitional seasons. Knowing the potential fishing ground in Pangandaran is very important to increase the catch of fishermen and maintain the sustainability of fisheries resources. In this study, a quantitative descriptive research method was used using a geographic information system approach. In May 2024 (transitional season 1), the average chlorophyll-a concentration ranged from 0.2 - 8 mg/m3 (mesotrophic waters) with average Sea Surface Temperature (SST) ranging from 26.13 - 29.38° C. In the eastern season (June, July, August) the average chlorophyll-a concentration was 0.2 - 2.3 mg/m3 (oligotrophic waters); 0.4 - 4.4 mg/m3 (mesotrophic waters); 11 - 33 mg/m3 (hypertrophic waters) with average sea surface temperature (SST) ranging from 28.4 - 36.5 °C; 26.6 - 32.24 °C; 23.5 – 32 °C. In September 2025 (transitional season 2), the average chlorophyll-a concentration was 1 - 18 mg/m3 (eutrophic waters), with average sea surface temperature (SST) ranging from 24.9 - 34.5 °C. The highest potential of large pelagic fish was found in June, July, and August 2024 (east season) in catch line 2. The potential catch of large pelagic fish in transitional season 1 (May 2024) was lower than in the east season, but the catch line was still in catch line 2. While in transitional season 2 (September 2024) the potential catch of large pelagic fish was lower than the east season and the catch line was outside catch line 2 (towards the open sea).
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Sea surface height, sea surface temperature, and chlorophyll-a as indicators for determining eddy in Indonesian waters

86%
Yuliadi L. P. S., Syamsudin M. L., Ferdyan A.
World News of Natural Sciences
|
2025
|
vol. 62
151-166
EN
Sea surface height, sea surface temperature, and chlorophyll-a are parameters that can identify and monitor the presence and characteristics of eddies more accurately in the complex and dynamic waters of Indonesia. The identification and monitoring of eddies are important for understanding ocean variability and its implications for marine ecosystems. The objective of this study is to determine the distribution and characteristics of eddies in Indonesian waters. The data used were obtained from HYCOM (Hybrid Coordinate Ocean Model). The study area covered Indonesian waters with coordinates 6°N - 11°S and 95°E - 141.5°E, then processed using MATLAB software. Eddy detection was performed using the Automated Eddy Detection (AED) method. Sea surface height, sea surface temperature, and chlorophyll-a data were calculated and overlaid with the eddy detection results. The results of the study show that the highest concentration of eddies occurs in the waters west of Sumatra, south of Java, and the Indian Ocean with 107 occurrences, and in the waters north of Papua and the Pacific Ocean with 101 occurrences. The average diameter of cyclonic eddies is 90.626 km and 95.834 km for anticyclonic eddies. The average SSH value was 0.547 m for cyclonic eddies and 0.644 m for anticyclonic eddies. The average temperature was 29.209 °C for cyclonic eddies and 29.356 °C for anticyclonic eddies. The average chlorophyll-a value is 0.069 mg/m3 for cyclonic eddies and 0.074 mg/m3 for anticyclonic eddies.
3
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Climatic change on King George Island in the years 1948–2011

72%
Kejna M., Araźny A., Sobota I.
Polish Polar Research
|
2013
|
issue 2
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