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<p><i>Chanos chanos</i> (Milkfish) is an ecologically and economically important aquaculture species in the Indo-Pacific, valued for its rapid growth, broad salinity tolerance, and high market demand. Sustainable utilization of this resource requires a clear understanding of its population genetic structure. In this study, we used 20 microsatellite loci to assess genetic variation across five Indian locations. These markers exhibited high resolution, with a mean polymorphic information content (PIC) value of 0.841, making them highly suitable for population genetic analyses. Analyses revealed high levels of genetic diversity w.r.to parameter like observed and exected heterozygosity (mean H<sub>O</sub> = 0.897; H<sub>E</sub> = 0.867), with an average of 14 alleles per locus. The global F<sub><i>ST</i></sub> was low but significant (0.008; <i>P</i> = 0.000), indicating weak genetic differentiation. Hierarchical AMOVA, grouping Chilika separately from other populations, showed a slight but significant difference between groups (F<sub><i>CT</i></sub> = 0.034; <i>P</i> = 0.023), while most genetic variation occurred within populations. These findings highlighted the importance of conserving natural genetic resources while enabling stock-specific management and selective crossbreeding strategies to enhance heterosis, improve aquaculture resilience, and ensure the long-term sustainability of Milkfish farming.</p>

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Microsatellite Markers Unveil the Genetic Tapestry of Milkfish Chanos chanos (Fabricius, 1775) in Indian Aquatic Realms

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Divya Merin Jose,
  • P. R. Divya

摘要

Chanos chanos (Milkfish) is an ecologically and economically important aquaculture species in the Indo-Pacific, valued for its rapid growth, broad salinity tolerance, and high market demand. Sustainable utilization of this resource requires a clear understanding of its population genetic structure. In this study, we used 20 microsatellite loci to assess genetic variation across five Indian locations. These markers exhibited high resolution, with a mean polymorphic information content (PIC) value of 0.841, making them highly suitable for population genetic analyses. Analyses revealed high levels of genetic diversity w.r.to parameter like observed and exected heterozygosity (mean HO = 0.897; HE = 0.867), with an average of 14 alleles per locus. The global FST was low but significant (0.008; P = 0.000), indicating weak genetic differentiation. Hierarchical AMOVA, grouping Chilika separately from other populations, showed a slight but significant difference between groups (FCT = 0.034; P = 0.023), while most genetic variation occurred within populations. These findings highlighted the importance of conserving natural genetic resources while enabling stock-specific management and selective crossbreeding strategies to enhance heterosis, improve aquaculture resilience, and ensure the long-term sustainability of Milkfish farming.