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Length-based population dynamics of the horseshoe crab Tachypleus gigas and management implications for shrimp fisheries in Kotabaru Waters, South Kalimantan, Indonesia
ILMU KELAUTAN: Indonesian Journal of Marine Sciences · Vol. 31 No. 3 (2026) · hlm. 229–242
- ISSN
- 2406-7598, 0853-7291
- Terbit
- 2026-09-10
- Penerbit
- Marine Science Department Diponegoro University
- Bahasa
- eng
Abstrak
Shrimp fisheries in Kotabaru, South Kalimantan, represent an integral part of Indonesia’s small-scale coastal fishing sector, primarily operating with trammel nets. While targeting penaeid shrimp, these fisheries frequently capture non-target species such as the horseshoe crab (Tachypleus gigas), resulting in incidental bycatch. Despite their ecological significance, localized management frameworks and monitoring efforts for T. gigas populations remain insufficient, particularly in data-limited fisheries. This study assessed the stock status of T. gigas in Kotabaru waters using a length-based approach. A total of 234 individuals, representing the size fraction vulnerable to trammel nets, were sampled between December 2024 and March 2025, of which 105 females were used for gonad maturity analysis. Key biological parameters were estimated, including the length–weight relationship, length at first maturity ( cm), and length at first capture ( cm, to support a length-based spawning potential ratio (LB-SPR) analysis. Results showed that T. gigas exhibits negative allometric growth ( ), indicating faster increase in length relative to weight. The estimated Lc was below the L50, indicating that the catch is dominated by immature individuals. The LB-SPR model estimated a spawning potential ratio (SPR) of 14%, falling below the 20% limit reference point, which indicates recruitment overfishing. These findings highlight the vulnerability of horseshoe crabs to bycatch pressure and underline the need for improved fisheries management. Recommended measures include enhancing gear selectivity, implementing seasonal closures during spawning periods, and strengthening bycatch monitoring to support sustainable shrimp fisheries in Kotabaru waters. This study demonstrates the utility of the LB-SPR framework for assessing non-target bycatch species in data-limited conditions, providing a baseline for localized conservation strategies.
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- University of Brawijaya
- National Research and Innovation Agency
- Udayana University
- IPB University
- Ministry of Marine Affairs and Fisheries
- National Taiwan Ocean University
- Southeast Asian Fisheries Development Center
- Organisasi lain
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- Organisasi berbeda
- Organisasi sama
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Tampilkan sebagai tabel
| Rekan penulis | Organisasi | Artikel bersama |
|---|---|---|
| Daduk Setyohadi | University of Brawijaya | 2 |
| Muhammad Arif Rahman | University of Brawijaya | 2 |
| Bram Setyadji | National Research and Innovation Agency | 1 |
| Raymon Rahmanov Zedta | IPB University | 1 |
| Arief Wujdi | National Research and Innovation Agency | 1 |
| Suciadi Catur Nugroho | Afiliasi tidak diketahui | 1 |
| Hety Hartaty | National Research and Innovation Agency | 1 |
| Masayu Rahmia Anwar Putri | National Research and Innovation Agency | 1 |
| Fathur Rochman | Ministry of Marine Affairs and Fisheries | 1 |
| Roy Kurniawan | National Research and Innovation Agency | 1 |
| Yesika Nanda Pramurdya | Udayana University | 1 |
| Syarifah Hikmah Julinda Sari | University of Brawijaya | 1 |
| Tri Djoko Lelono | University of Brawijaya | 1 |
| Dewa Gede Raka Wiadnya | University of Brawijaya | 1 |
| Bambang Semedi | University of Brawijaya | 1 |
| Novia Fara Diza | University of Brawijaya | 1 |
| Ming‐An Lee | National Taiwan Ocean University | 1 |
| Defri Yona | University of Brawijaya | 1 |
| Yuniar Ponco Prananto | Afiliasi tidak diketahui | 1 |
| Mangesti Reza Evitantri | Afiliasi tidak diketahui | 1 |
| Danu Setia Wardana | Afiliasi tidak diketahui | 1 |
| Dyah Ajeng Pitaloka | Afiliasi tidak diketahui | 1 |
| Diana Ningrum | Afiliasi tidak diketahui | 1 |
| Mochamad Arif Zainul Fuas | Afiliasi tidak diketahui | 1 |
| Atsuhiko Isobe | Afiliasi tidak diketahui | 1 |
| Gatut Bintoro | University of Brawijaya | 1 |
| Herlian Putri Zulfania | University of Brawijaya | 1 |
| Shobriyyah Afifah Nabilah | University of Brawijaya | 1 |
| Supapong Pattarapongpan | Southeast Asian Fisheries Development Center | 1 |
| I Nyoman Yoga Parawangsa | Warmadewa University | 1 |
| Gede Arya Kusuma Artha | Udayana University | 1 |
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