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<p>Mud crab (<i>Scylla olivacea</i>) aquaculture has traditionally depended on capturing and fattening wild juveniles, which has contributed to declining populations in Bangladesh. To address this issue, broodstocks were collected from offshore and estuary regions and transported to a private hatchery to establish a mass seed production system. Seasonal maturation rates were highest in summer (52.08%), followed by late autumn (42.30%), pre-autumn (30.12%), and monsoon (26.11%). Offshore broodstock had a higher spawning rate than estuarine broodstock (71.42% vs. 30.95%), with those weighing over 300&#xa0;g exhibiting the highest spawning rate (51.51 ± 17.40%). Seasonality influenced the mean number of zoea-1 larvae production from brood crab in the following decreasing order: summer (0.77 ± 0.40) &gt; Pre-autumn (0.72 ± 0.15) &gt; late-autumn (0.71 ± 0.25) &gt; monsoon (0.16 ± 0.06). Zoea (Z) rearing was conducted in two MT tanks using artemia nauplii and shrimp larval feed. The highest mortality occurred during the transitions from <i>zoea-5</i> to megalopa (77.55%) and from megalopa to crablet (84.02%), followed by the mid-stages (Z3–Z4, Z4–Z5) and the early zoeal stages (Z1–Z2, Z2–Z3). Larvae took 24–31&#xa0;days to reach the first stage. Of the 42 trials, only 8 successfully completed the entire cycle. The most successful batch (SB4) had a survival rate of 3.17%, which could potentially increase to 11.0% with decreasing stocking density (15 megalopa/L to 3.75 megalopa/L). SWOT analysis suggests improving feed quality, addressing hatchery constraints, and maintaining ideal environmental conditions are among the main challenges. A well-structured hatchery with standardized procedures can enhance large-scale <i>S. olivacea</i> seed production, supporting sustainable aquaculture and Bangladesh's blue economy.</p>

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Advancing mass seed production of mud crab (Scylla olivacea) in captive conditions: challenges and opportunities for sustainable aquaculture development in Bangladesh

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Zobaer Masum,
  • Mohammad Abu Naeem,
  • Syduzzaman,
  • Md. Rakeb-Ul Islam,
  • Md Asaduzzaman,
  • Mohammed Shariful Azam,
  • Benoy Kumar Barman,
  • Abdullah-Al Mamun

摘要

Mud crab (Scylla olivacea) aquaculture has traditionally depended on capturing and fattening wild juveniles, which has contributed to declining populations in Bangladesh. To address this issue, broodstocks were collected from offshore and estuary regions and transported to a private hatchery to establish a mass seed production system. Seasonal maturation rates were highest in summer (52.08%), followed by late autumn (42.30%), pre-autumn (30.12%), and monsoon (26.11%). Offshore broodstock had a higher spawning rate than estuarine broodstock (71.42% vs. 30.95%), with those weighing over 300 g exhibiting the highest spawning rate (51.51 ± 17.40%). Seasonality influenced the mean number of zoea-1 larvae production from brood crab in the following decreasing order: summer (0.77 ± 0.40) > Pre-autumn (0.72 ± 0.15) > late-autumn (0.71 ± 0.25) > monsoon (0.16 ± 0.06). Zoea (Z) rearing was conducted in two MT tanks using artemia nauplii and shrimp larval feed. The highest mortality occurred during the transitions from zoea-5 to megalopa (77.55%) and from megalopa to crablet (84.02%), followed by the mid-stages (Z3–Z4, Z4–Z5) and the early zoeal stages (Z1–Z2, Z2–Z3). Larvae took 24–31 days to reach the first stage. Of the 42 trials, only 8 successfully completed the entire cycle. The most successful batch (SB4) had a survival rate of 3.17%, which could potentially increase to 11.0% with decreasing stocking density (15 megalopa/L to 3.75 megalopa/L). SWOT analysis suggests improving feed quality, addressing hatchery constraints, and maintaining ideal environmental conditions are among the main challenges. A well-structured hatchery with standardized procedures can enhance large-scale S. olivacea seed production, supporting sustainable aquaculture and Bangladesh's blue economy.