Exotic fish and decreasing habitats vis-à-vis conservation of freshwater fish biodiversity of Bangladesh

  • Md. Abdul Gofur Khan Department of Zoology, University of Chittagong, Chittagong 4331, Bangladesh
  • Shams M. Galib Department of Fisheries, University of Rajshahi, Rajshahi 6205, Bangladesh
  • Mahabuba Hasnath Department of Zoology, University of Chittagong, Chittagong 4331, Bangladesh
  • Md. Rubel Mia Department of Zoology, University of Chittagong, Chittagong 4331, Bangladesh
  • Raihan Kibria MIS Faculty, American International University, Dhaka 1229, Bangladesh
Keywords: aquaculture impacts, conservation, exotic fish, habitat shrinkage, native fish biodiversity


Multiple stressors including biological invasion have long been recognised in conservation of freshwater fish biodiversity. Works in this line have, however, been still scanty in Asia and South America – the continents known for rich biodiversity. In this study, the first of its type in Bangladesh, impacts of exotic fish and declining habitats on native fishes have been investigated. Regression and correlation analyses of 16 years production data of ponds, practically the only habitat where exotic fish are cultured commonly with indigenous ones, reveals that a maximum of 25% of the abundance decrease of native fish could be due to the effects of five commonly cultured exotic fish. Rest of the decline might largely be due to shrinkage, degradation, and destruction of habitats. Inland habitats other than ponds shrink, commonly, by about 80 % during the dry season, and most rivers are heavily polluted except for the brief mid rainy season. Decline in native fish populations may result in reduced genetic diversity. Another potential danger is the probable genetic introgression from the less fit hatchery-originated fish with the wild ones. The study concludes that the native freshwater fishes are endangered by declining habitats, exotic fishes, genetic consequences of hatchery supplementation


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How to Cite
Khan, M. A. G., Galib, S. M., Hasnath, M., Mia, M. R., & Kibria, R. (2022). Exotic fish and decreasing habitats vis-à-vis conservation of freshwater fish biodiversity of Bangladesh. Journal of Fisheries, 10(1), 101301. https://doi.org/10.17017/j.fish.397