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<p>The aquatic habitats face unprecedented threats from natural and anthropogenic stressors, impacting fish survival and dispersal. Spatial prioritisation of suitable habitats is a key component of fish conservation and management. This study utilizes geospatial tools to assess and map suitable habitats for the flagship and economically important species, <i>Neolissochilus hexagonolepis</i>, in the Teesta River basin, India. The spatial data on ecological and habitat requirements including topography, hydrological, and physio-chemical status datasets were developed and analysed using the Geographic Information System (GIS). The instream habitats of the basin were classified as moderately suitable (11.65 km<sup>2</sup>; 81%) &gt; highly suitable (2.59 km<sup>2</sup>; 18%) &gt; least suitable (0.14 km<sup>2</sup>; 1%) for chocolate mahseer. The highly suitable zones were primarily located in the tributaries (Rangit; Rangpo Chu) and confluences, where microhabitats with suitable substrate and optimal water quality serve as ‘refugia’. Field-validated highly suitable habitats, particularly in lower basin tributaries, can assist resource managers and policymakers in devising in situ conservation strategies for chocolate mahseer. Additionally, this study can serve as a model for developing species-specific spatial conservation planning, contributing to the holistic development of fisheries resources in India and beyond.</p>

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Habitat suitability mapping of chocolate mahseer, Neolissochilus hexagonolepis (McClelland, 1839) in the Teesta River basin, Indian Himalayan region for conservation

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Vijay Kumar,
  • Ganesan Kantharajan,
  • Lalit Kumar Tyagi,
  • Achal Singh,
  • Rejani Chandran,
  • A. K. Pathak,
  • Amit Singh Bisht,
  • L. Mog Chowdhury,
  • Rajeev K. Singh,
  • Uttam Kumar Sarkar

摘要

The aquatic habitats face unprecedented threats from natural and anthropogenic stressors, impacting fish survival and dispersal. Spatial prioritisation of suitable habitats is a key component of fish conservation and management. This study utilizes geospatial tools to assess and map suitable habitats for the flagship and economically important species, Neolissochilus hexagonolepis, in the Teesta River basin, India. The spatial data on ecological and habitat requirements including topography, hydrological, and physio-chemical status datasets were developed and analysed using the Geographic Information System (GIS). The instream habitats of the basin were classified as moderately suitable (11.65 km2; 81%) > highly suitable (2.59 km2; 18%) > least suitable (0.14 km2; 1%) for chocolate mahseer. The highly suitable zones were primarily located in the tributaries (Rangit; Rangpo Chu) and confluences, where microhabitats with suitable substrate and optimal water quality serve as ‘refugia’. Field-validated highly suitable habitats, particularly in lower basin tributaries, can assist resource managers and policymakers in devising in situ conservation strategies for chocolate mahseer. Additionally, this study can serve as a model for developing species-specific spatial conservation planning, contributing to the holistic development of fisheries resources in India and beyond.