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<p>Otolith morphology and morphometrics have been widely used to investigate taxonomic distinctions and infer potential relationships among fish species. This study focuses on the sagittal otolith shape and morphological traits of three <i>Nemipterus</i> species (<i>N. zysron</i>,<i> N. randalli</i>, and <i>N. bipunctatus</i>), employing size parameters, shape descriptors, Elliptic Fourier Analysis (EFA), and Scanning Electron Microscopy (SEM). Linear relationships were observed between otolith morphometric parameters namely, feret length (OL), feret width (OH), weight (OW), area (OA), and perimeter (OP) and fish biometric traits, including standard length (SL) and body weight (W). Ten shape descriptors, including Circularity (CI), Roundness (RO), and Ellipticity (EL), were evaluated and corrected for size effects. The strongest correlations were noted in OP-OL for <i>N. zysron</i> and <i>N. randalli</i>, and OA-OL for <i>N. bipunctatus</i> Uncorrected descriptors correlated significantly with SL, OL, OH, and OW, whereas corrected descriptors showed mostly non-significant correlations, indicating the effect of size correction. EFA revealed interspecific differences in otolith contour patterns. <i>N. randalli</i> and <i>N. bipunctatus</i> displayed greater morphological similarity, while <i>N. zysron</i> appeared more morphologically distinct. SEM provided detailed structural insights, revealing interspecific differences in the <i>sulcus acusticus</i>, rostrum, and margins, with six unique traits distinguishing <i>N. zysron.</i> This study demonstrates otolith shape analysis as a cost-effective and reliable method for fish species discrimination. These findings underscore the value of otolith-based approaches as alternatives to genetic marker techniques, enhancing taxonomic research.</p>

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Using sagittal otolith morphometrics and shape to discriminate three Nemipterus species (Teleostei: Nemipteridae) from Hurghada, Red Sea, Egypt

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月1日

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  • Imam A. A. Mekkawy,
  • Samia M. El-Mahdy,
  • Usama M. Mahmoud,
  • Ola I. Muhammad

摘要

Otolith morphology and morphometrics have been widely used to investigate taxonomic distinctions and infer potential relationships among fish species. This study focuses on the sagittal otolith shape and morphological traits of three Nemipterus species (N. zysron, N. randalli, and N. bipunctatus), employing size parameters, shape descriptors, Elliptic Fourier Analysis (EFA), and Scanning Electron Microscopy (SEM). Linear relationships were observed between otolith morphometric parameters namely, feret length (OL), feret width (OH), weight (OW), area (OA), and perimeter (OP) and fish biometric traits, including standard length (SL) and body weight (W). Ten shape descriptors, including Circularity (CI), Roundness (RO), and Ellipticity (EL), were evaluated and corrected for size effects. The strongest correlations were noted in OP-OL for N. zysron and N. randalli, and OA-OL for N. bipunctatus Uncorrected descriptors correlated significantly with SL, OL, OH, and OW, whereas corrected descriptors showed mostly non-significant correlations, indicating the effect of size correction. EFA revealed interspecific differences in otolith contour patterns. N. randalli and N. bipunctatus displayed greater morphological similarity, while N. zysron appeared more morphologically distinct. SEM provided detailed structural insights, revealing interspecific differences in the sulcus acusticus, rostrum, and margins, with six unique traits distinguishing N. zysron. This study demonstrates otolith shape analysis as a cost-effective and reliable method for fish species discrimination. These findings underscore the value of otolith-based approaches as alternatives to genetic marker techniques, enhancing taxonomic research.