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<p>Indian halibut (<i>Psettodes erumei</i>) is a commercially significant demersal fish widely distributed in Indian waters, primarily caught using demersal trawls. However, the absence of clearly defined population discrimination for this species poses a challenge to developing population-specific conservation management strategies. This study investigates the population structure of <i>P. erumei</i> in the Andaman Sea (AS) and Bay of Bengal (BoB), two large marine ecosystems in the eastern Indian Ocean, using body shape and otolith shape analyses. A total of 143 fish were analysed using geometric morphometric analysis (GMA) with body-shape landmarks and wavelet analysis of otolith shape using wavelet coefficients. The BoB population was characterised by larger heads, anteriorly positioned eyes, and pectoral, dorsal, and anal fins, along with reduced intra-specific variability, compared to the AS population. Otolith shape also varied significantly, particularly in the postero-ventral and postero-dorsal margins. Otoliths from the AS population exhibited a more angled postero-ventral margin and pointed posterior margins, while those from the BoB population displayed peaked postero-dorsal margins and more angled antero-dorsal margins. These findings highlight a distinct population of <i>P. erumei</i> in the eastern Indian Ocean. This study is the first to document population discrimination in <i>P. erumei</i> from Indian waters and is particularly significant in the context of reported population declines in the Arabian Sea. The results provide a foundation for developing targeted, population-specific management and conservation strategies for this commercially important fish species.</p>

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Population Discrimination of Indian Halibut Psettodes erumei (Bloch & Schneider, 1801; Psettodidae) in the Eastern Indian Ocean

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Ameen Ummath,
  • K. V. Aneesh Kumar,
  • Fahmeeda Parveen,
  • Ashish P. Jacob,
  • Samrat Kalita,
  • G. Padmavati,
  • Sasidharan Venu

摘要

Indian halibut (Psettodes erumei) is a commercially significant demersal fish widely distributed in Indian waters, primarily caught using demersal trawls. However, the absence of clearly defined population discrimination for this species poses a challenge to developing population-specific conservation management strategies. This study investigates the population structure of P. erumei in the Andaman Sea (AS) and Bay of Bengal (BoB), two large marine ecosystems in the eastern Indian Ocean, using body shape and otolith shape analyses. A total of 143 fish were analysed using geometric morphometric analysis (GMA) with body-shape landmarks and wavelet analysis of otolith shape using wavelet coefficients. The BoB population was characterised by larger heads, anteriorly positioned eyes, and pectoral, dorsal, and anal fins, along with reduced intra-specific variability, compared to the AS population. Otolith shape also varied significantly, particularly in the postero-ventral and postero-dorsal margins. Otoliths from the AS population exhibited a more angled postero-ventral margin and pointed posterior margins, while those from the BoB population displayed peaked postero-dorsal margins and more angled antero-dorsal margins. These findings highlight a distinct population of P. erumei in the eastern Indian Ocean. This study is the first to document population discrimination in P. erumei from Indian waters and is particularly significant in the context of reported population declines in the Arabian Sea. The results provide a foundation for developing targeted, population-specific management and conservation strategies for this commercially important fish species.