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<p>The present study investigates the population structure and reproductive biology of <i>Nanosesarma batavicum</i> inhabiting the oyster reef ecosystems of the Vellar estuary southeastern India. A total of 1,869 individuals were collected from August 2024 to July 2025, comprising 996 males (53.3%) and 873 females (46.7%), indicating a slightly male-oriented population. The species exhibited continuous breeding throughout the year, with ovigerous females observed in all months and fecundity ranging from 223 to 1,787. Fecundity range was strongly correlated with carapace width (<i>R²</i> = 0.8795). Seasonal variations in morphometric traits revealed positive allometric growth (<i>b</i> &gt; 3) in both length–weight and width–weight relationships, and negative allometry (<i>b</i> &lt; 3) in the length–width relationship, indicating lateral carapace expansion as an intertidal adaptation. The highest condition factor and mean morphometric values were recorded in the post-monsoon season, reflecting enhanced somatic and reproductive condition. These findings confirm that <i>N. batavicum</i> exhibits ecological resilience and adaptive reproductive strategies typical of small tropical sesarmid crabs, providing the first comprehensive baseline for future comparative and conservation studies on estuarine crab populations.</p>

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Population Structure, Reproductive Biology, and Allometric Growth of the Sesarmid Crab, Nanosesarma batavicum (Moreira, 1903) (Brachyura, Sesarmidae) in the Oyster Bed of a Tropical Estuary

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • G. Jana,
  • A. Arundathy,
  • S. Anbuselvan,
  • V. Sanjaikumar,
  • E. Shamkumar,
  • M. Thangaraj

摘要

The present study investigates the population structure and reproductive biology of Nanosesarma batavicum inhabiting the oyster reef ecosystems of the Vellar estuary southeastern India. A total of 1,869 individuals were collected from August 2024 to July 2025, comprising 996 males (53.3%) and 873 females (46.7%), indicating a slightly male-oriented population. The species exhibited continuous breeding throughout the year, with ovigerous females observed in all months and fecundity ranging from 223 to 1,787. Fecundity range was strongly correlated with carapace width (R² = 0.8795). Seasonal variations in morphometric traits revealed positive allometric growth (b > 3) in both length–weight and width–weight relationships, and negative allometry (b < 3) in the length–width relationship, indicating lateral carapace expansion as an intertidal adaptation. The highest condition factor and mean morphometric values were recorded in the post-monsoon season, reflecting enhanced somatic and reproductive condition. These findings confirm that N. batavicum exhibits ecological resilience and adaptive reproductive strategies typical of small tropical sesarmid crabs, providing the first comprehensive baseline for future comparative and conservation studies on estuarine crab populations.