Author: Avijit Lahiri
DOI Link: https://doi.org/10.70798/PP/020400020
Abstract: Small indigenous fish species (SIFs) have been recognized as vital components of freshwater biodiversity, nutritional security, and rural livelihoods across South Asia. However, rapid environmental change and anthropogenic pressures have contributed to the decline of these species, particularly in floodplain-dominated regions of eastern India. The present study had been conducted to document ichthyofaunal diversity, seasonal variation, habitat-wise distribution, and conservation status of small indigenous fish species in the freshwater ecosystems of Malda district, West Bengal. Field surveys had been carried out over a three-year period (2023–2025) across rivers, floodplain wetlands (beels), ponds, and canals using standardized sampling techniques. Species richness, Shannon–Wiener diversity index, Simpson’s dominance index, and relative abundance had been analyzed. A total of 32 small indigenous fish species belonging to 15 families had been recorded. Floodplain wetlands had supported the highest species richness and diversity, followed by ponds, rivers, and canals. Seasonal analysis had revealed peak species occurrence during the monsoon, with marked declines during the pre-monsoon and winter seasons. Although most species had been categorized as Least Concern at the global level, several Near Threatened, Vulnerable, and Data Deficient species had been documented locally. The findings had emphasized the ecological importance of floodplain connectivity and seasonal hydrological regimes, highlighting the urgent need for habitat-based conservation and sustainable fisheries management strategies.
Keywords: Small Indigenous Fishes, Ichthyofaunal Diversity, Seasonal Variation, Freshwater Ecosystems, Conservation Status, Malda District.
Page No: 137-141