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<p>The balance between food security of fishing communities and sustainable fisheries is particularly acute in tropical developing nations, where dense coastal populations and a high reliance on artisanal fisheries create a complex socio-ecological system. The Sangu River Estuary in Bangladesh, a key ecosystem in the Bengal Delta, sustains diverse fisheries that underpin local livelihoods. Here, we quantified the estuary’s fisheries diversity and identified the environmental drivers of its seasonal community dynamics. In 2022, we collected specimens using Estuarine Set-Bag Nets across four seasons, and identified a total of 75 species from 34 families and 16 orders. The gobiid <i>Odontamblyopus rubicundus</i> was the most abundant, accounting for 30% of the total catch. The community composition shifted between seasons, and diversity was highest during the pre-monsoon season (Shannon-Wiener diversity index, H′= 2.4 ± 0.2) compared with the monsoon (H′= 1.4 ± 0.5) and post-monsoon seasons (H′= 1.6 ± 0.3). Water salinity, pH, and dissolved oxygen were the primary variables structuring the community, explaining 71% of the variance. These findings provide the comprehensive quantitative baseline of the Sangu River Estuary’s fisheries assemblage, revealing strong seasonal shifts and a clear abiotic control over community structure. To ensure long-term sustainability, we propose adaptive, ecosystem-based management priorities that integrate the protection of critical habitats, evidence-based fisheries management, and long-term ecological monitoring to enhance resilience under increasing climatic and anthropogenic pressures.</p>

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Fisheries Diversity in a Tropical Estuary of the Bengal Delta

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Mohammad Rakibul Hoque,
  • Md. Mostafa Monwar,
  • Mohammed Shahidul Alam,
  • Umme Juena,
  • Md. Abdulla Monzer,
  • Anika Tabasum,
  • Faiz Md. Taimur,
  • Sahat Ratmuangkhwang,
  • Md. Shah Paran,
  • Md Rakibul Islam,
  • Shanjida Akter Joyoti,
  • Tanjila Sultana,
  • Ayesha Safika Chowdhury,
  • Siti Aisyah

摘要

The balance between food security of fishing communities and sustainable fisheries is particularly acute in tropical developing nations, where dense coastal populations and a high reliance on artisanal fisheries create a complex socio-ecological system. The Sangu River Estuary in Bangladesh, a key ecosystem in the Bengal Delta, sustains diverse fisheries that underpin local livelihoods. Here, we quantified the estuary’s fisheries diversity and identified the environmental drivers of its seasonal community dynamics. In 2022, we collected specimens using Estuarine Set-Bag Nets across four seasons, and identified a total of 75 species from 34 families and 16 orders. The gobiid Odontamblyopus rubicundus was the most abundant, accounting for 30% of the total catch. The community composition shifted between seasons, and diversity was highest during the pre-monsoon season (Shannon-Wiener diversity index, H′= 2.4 ± 0.2) compared with the monsoon (H′= 1.4 ± 0.5) and post-monsoon seasons (H′= 1.6 ± 0.3). Water salinity, pH, and dissolved oxygen were the primary variables structuring the community, explaining 71% of the variance. These findings provide the comprehensive quantitative baseline of the Sangu River Estuary’s fisheries assemblage, revealing strong seasonal shifts and a clear abiotic control over community structure. To ensure long-term sustainability, we propose adaptive, ecosystem-based management priorities that integrate the protection of critical habitats, evidence-based fisheries management, and long-term ecological monitoring to enhance resilience under increasing climatic and anthropogenic pressures.