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All Journal HAYATI Journal of Biosciences MARLIN : Marine and Fisheries Science Technology Journal
Syamsuddin, Awaludin
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science

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Journal : HAYATI Journal of Biosciences

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Population Structure, Site Fidelity, and Residency Patterns of Whale Sharks (Rhincodon typus) in Botubarani Waters, Gorontalo Province, Indonesia Rahman, Rahman; Suyasa, I Nyoman; Syamsuddin, Awaludin; Pahlevi, Reza Shah
HAYATI Journal of Biosciences Vol. 32 No. 4 (2025): July 2025
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.32.4.908-919

Abstract

Whale shark (Rhincodon typus) is the largest fish species in the world and is classified as endangered. This study is crucial for the conservation of this species and developing effective conservation strategies. The research was conducted in the Botubarani waters, Gorontalo Province. Individual whale shark identification was performed using Photo ID, including the identification of sex and wound location. Photo IDs were processed using the Interactive Individual Identification System (I3S) software and includes information related to the ID, body length, and the time the individual was previously identified. Monitoring of the location, number, timing of whale shark presences and water parameters, was carried out through direct field observations. The results showed that 5 whale shark individuals were identified, all of which were male, with lengths ranging from 4.5 to 4.8 meters, and 1 individual had visible wounds. From 78 days of monitoring, Whale sharks were observed for 70 days and not observed for 8 days. The frequency of whale shark appearances ranged from 1 to 4 individuals per day. Whale sharks in Botubarani waters exhibited site fidelity and a mixed migration pattern. The intensity of their presence is quite high. This intensity is supported by ecological conditions that are optimal for the life of whale sharks, particularly those of juvenile age. The measured water parameters significantly influence their presence.
Co-Authors Abdul Rahman Aditia, Nadia Hema Basuki Rachmad I Nyoman Suyasa Pahlevi, Reza Shah Rahman Rahman Suhernalis, Suhernalis