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All Journal Jurnal Sain Veteriner ILMU KELAUTAN: Indonesian Journal of Marine Sciences Torani Journal of Fisheries and Marine Science Bernas JOURNAL OF SCIENCE AND SOCIAL RESEARCH Jurnal Ilmiah Pendidikan Matematika Al Qalasadi Jurnal Ekonomi Diadik: Jurnal Ilmiah Teknologi Pendidikan Jurnal Pendidikan dan Pengabdian Masyarakat Jurnal Literasi dan Pembelajaran Indonesia
Safruddin .
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Mathematics Social Sciences Veterinary Other

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Spatial Modeling of Yellowfin Tuna in the Banda Sea Based on Oceanographic Factors Using MaxEnt Asuhadi, Sunarwan; Zainuddin, Mukti; Safruddin, Safruddin; Musbir, Musbir
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 30, No 1 (2025): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.30.1.103-114

Abstract

This study models the spatial distribution of yellowfin tuna (YFT) in the Banda Sea using the MaxEnt approach, addressing critical questions about its predictive capability, the influence of environmental variables such as sea surface temperature (SST) and chlorophyll-a concentration, and temporal patterns. MaxEnt was chosen for its ability to predict potential distribution areas based on presence data and environmental factors. Data utilized include fish catch records obtained from the fishing logbook of the Ministry of Marine Affairs and Fisheries of the Republic of Indonesia, chlorophyll-a concentration, and SST data sourced from ocean color satellite observations. Model performance was evaluated using the Area Under the Curve (AUC) metric. Study results reveal that significant spatial and temporal variations in YFT distribution are influenced by oceanographic factors, with the model performing best in July (AUC 0.72) and lowest in April, September, and December (AUC ~0.60). SST was the dominant variable in November (82.35%), while chlorophyll-a had the highest contribution in April (83.02%). These findings highlight the dynamic link between tuna distribution and environmental conditions. The spatial maps offer insights for optimizing fishing practices, reducing pressure on overexploited stocks, and supporting sustainable fisheries management through data-driven approaches like MaxEnt. However, the MaxEnt model has limitations such as sensitivity to multicollinearity, overfitting, and low transferability. Future research could enhance accuracy and robustness by using advanced methods like Spatial Maxent, Monte Carlo Variable Selection, or ensemble modeling to support adaptive fisheries management.
The Characteristics of Fishing Ground Using Purse Seine in Makassar Strait and Flores Sea ., Safruddin
Torani Journal of Fisheries and Marine Science VOLUME 5 NOMOR 2, JUNI 2022
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35911/torani.v5i2.22412

Abstract

In order to optimally utilize marine fishery resources, the Government of the Republic of Indonesia divides Indonesian waters into 11 Fisheries Management Areas (IFMA), one of which is IFMA 713 which includes the waters of Bone Gulf, Bali Sea, Flores Sea and Makassar Strait. This study aims to provide information on the utilization of pelagic fish resources with a focus on the characteristics of fishing areas using purse seine fishing gear in the Makassar Strait and Flores Sea. In this study, 62 fishing trips using purse seines were carried out, each has 31 trips fishing operation in the Makassar Strait and in the waters of Flores Sea, respectively. The main catch and number for each water area was skipjack tuna (Katsuwonus pelamis) as many as 2,367 fish (Makassar Strait). While in the Flores Sea area, it is dominated by little tuna (Euthynnus sp) with a total of 11,039 fish. The results of this study indicate that the correlation of sea surface temperature with chlorophyll-a in the waters of the Makassar Strait and Flores Sea has a negative relationship with an optimum sea surface temperature of 30.5 °C for skipjack tuna and 28.0 °C for little tuna which corresponds to the chlorophyll-a concentration of 0.3 mg m-3 (skipjack tuna) and 0.2 mg m-3 for little tuna. The vertical distribution of skipjack tuna was found at the optimum depth of around 50 m, while most little tuna was caught in deeper waters around 250 m.
Co-Authors Agus Budi Santoso Anggi Zulfahmi Asuhadi, Sunarwan CIK ZULIA dedi kurniawan Dewi, Nurul Kemala Fajri, Surya Inangda, Neni Tiyas Itsna Oktaviyanti Lessy, Djaffar M. Untoro Marhayati Mukti Zainuddin Murtiadi Awaluddin Musbir Musbir Noverina Chaniago Rosyidah, Awal Nur Kholifatur Sari, Mega Puspita Sopamena, Patma Suyatno Suyatno Tri Gunarsih