Identification and diversity analysis of rabbitfish (Acanthuriformes: Siganidae) from Sedayu Lawas Coastline, Lamongan District, Indonesia
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Abstract. Paricahya AF, Harahap MAR, Amalia E, Hidayat AN, Hidayati DA. 2026. Identification and diversity analysis of rabbitfish (Acanthuriformes: Siganidae) from Sedayu Lawas Coastline, Lamongan District, Indonesia. Indo Pac J Ocean Life 10 (1): o100104. https://doi.org/10.13057/oceanlife/o100104. The Siganidae family has been widely studied, but the previous study still focused on a limited number of species, such as Siganus canaliculatus. Consequently, the potential distribution and diversity of other Siganidae species in specific regions remain poorly documented, placing their populations at high risk of overexploitation due to limited data collection and their incidental capture as bycatch. In this study, specimens were collected using several types of fishing gear, each adapted to one of three habitat types in Sedayu Lawas Coastline, Lamongan District, Indonesia: Mangrove Estuary (MaE), Muddy Beach (MuB), and Coral Beach (CoB). Data on fish catches were collected once a week for three months (January-March 2025). Species were identified using key morphological characteristics, resulting in the identification of a total of 1,046 specimens. Four of the seven recorded Siganidae species were captured, including Siganus guttatus, which exhibited two distinct variants. Diversity was assessed using Species Abundance (Sa), the Shannon-Wiener Index (H′), and the Simpson Dominance Index (C). The highest Sa values were 35.2% for Siganus javus at the CoB site, 38.4% for S. canaliculatus at the MaE site, and 43.4% for S. canaliculatus at the MuB site. The mean H′ and C values varied among sites, with 0.97, 0.99, and 1.09 for H′, and 0.39, 0.41, and 0.36 for C at MaE, MuB, and CoB, respectively. These values also differed across months, with H′ values of 1.12, 0.69, and 1.24 and C values of 0.35, 0.50, and 0.31 for January, February, and March, respectively. The results indicate that the highest abundance was observed in CoB, however, the presence of other habitats also contributes to supporting populations of various Siganidae species. Implementing habitat based management, strengthening ecological conservation, and centralizing species specific catch data are essential to enhance the sustainability of Siganidae fisheries.
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