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<p>The mud crab (<i>Scylla serrata</i>) is an economically important, valuable crustacean with considerable potential for sustainable aquaculture development; however, effective broodstock conditioning remains constrained by dependence on wild-caught seed and limited understanding of optimal environmental requirements for reproduction. This study investigated the influence of salinity on the reproductive performance of <i>S. serrata</i> broodstock under controlled rearing conditions. Female mud crabs of uniform size (average weight of 400.00 ± 10.00&#xa0;g and average length 126.13 ± 1.02&#xa0;mm) were maintained for eight weeks at three salinity levels (25, 30, and 35 ppt). Gonadosomatic index (GSI), hepatosomatic index (HSI), ovarian carotenoid concentration, and gonadal and hepatopancreatic histology were evaluated. Broodstock reared at 30 ppt exhibited significantly higher GSI (11.14 ± 0.79%), although HSI (5.56 ± 0.41%) did not differ significantly among treatments, along with enhanced ovarian carotenoid accumulation (0.182 ± 0.063&#xa0;µg mg⁻¹), indicating improved vitellogenesis and metabolic efficiency. Histological observations at 30 ppt revealed well organized ovarian lobules with mature vitellogenic oocytes and structurally intact hepatopancreatic tubules, reflecting efficient energy storage and mobilization. In contrast, crabs reared at 25 and 35 ppt showed suppressed ovarian development and signs of tissue degeneration. The results demonstrate that a salinity of 30 ppt provides optimal conditions for synchronized ovarian maturation, and carotenoid deposition in <i>S. serrata</i>, highlighting salinity optimization as a critical strategy for effective broodstock conditioning and sustainable mud crab hatchery production.</p>

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Reproductive response of female mud crab Scylla serrata broodstock to different salinity regimes in the Pulicat region, Tamil Nadu, India

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • H Manimaran,
  • P Chidambaram,
  • Cheryl Antony,
  • A Uma,
  • S Selvaraj,
  • R Dinesh,
  • R Velmurugan,
  • P Yuvarajan,
  • M Joshna

摘要

The mud crab (Scylla serrata) is an economically important, valuable crustacean with considerable potential for sustainable aquaculture development; however, effective broodstock conditioning remains constrained by dependence on wild-caught seed and limited understanding of optimal environmental requirements for reproduction. This study investigated the influence of salinity on the reproductive performance of S. serrata broodstock under controlled rearing conditions. Female mud crabs of uniform size (average weight of 400.00 ± 10.00 g and average length 126.13 ± 1.02 mm) were maintained for eight weeks at three salinity levels (25, 30, and 35 ppt). Gonadosomatic index (GSI), hepatosomatic index (HSI), ovarian carotenoid concentration, and gonadal and hepatopancreatic histology were evaluated. Broodstock reared at 30 ppt exhibited significantly higher GSI (11.14 ± 0.79%), although HSI (5.56 ± 0.41%) did not differ significantly among treatments, along with enhanced ovarian carotenoid accumulation (0.182 ± 0.063 µg mg⁻¹), indicating improved vitellogenesis and metabolic efficiency. Histological observations at 30 ppt revealed well organized ovarian lobules with mature vitellogenic oocytes and structurally intact hepatopancreatic tubules, reflecting efficient energy storage and mobilization. In contrast, crabs reared at 25 and 35 ppt showed suppressed ovarian development and signs of tissue degeneration. The results demonstrate that a salinity of 30 ppt provides optimal conditions for synchronized ovarian maturation, and carotenoid deposition in S. serrata, highlighting salinity optimization as a critical strategy for effective broodstock conditioning and sustainable mud crab hatchery production.