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All Journal JURNAL ILMIAH PLATAX
Simanjuntak, Melati Octapian
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Environmental Science

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Preliminary Study on the Reproduction of Three Rabbitfish Species (Siganidae) in Sopura Bay, Kolaka Regency : Muhammad Gazali; Sanjaya, M Din Hamdan; , Juhardin; Simanjuntak, Melati Octapian
Jurnal Ilmiah PLATAX Vol. 14 No. 1 (2026): ISSUE JANUARY-JUNE 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v14i1.64920

Abstract

This preliminary study investigated the reproductive biology of three rabbitfish species Siganus doliatus, Siganus canaliculatus, and Siganus puellus collected from Sopura Bay, Kolaka Regency, Southeast Sulawesi. A total of 351 individuals were analyzed between September and November 2025 to determine sex ratio, gonad maturity stages, gonadosomatic index (GSI), and length at first gonad maturity (Lₘ). The results showed male-biased populations in S. puellus (1.53:1) and S. doliatus (1.82:1), while S. canaliculatus exhibited a balanced sex ratio (1.01:1). Most individuals were at gonad maturity stages III–IV, indicating active gonadal development during the sampling period, with the spawning peak estimated in late October to November. The Lₘ values differed between species and sexes, suggesting adaptive reproductive strategies, where males generally matured at smaller sizes than females. The highest GSI values were recorded in S. puellus, indicating higher reproductive activity. These findings provide essential baseline data for understanding reproductive patterns and support sustainable management of rabbitfish resources in Sopura Bay
Co-Authors , Juhardin Muhammad Gazali Sanjaya, M Din Hamdan