Environment and fish fauna of the Atrai River: global and local conservation perspective

Nipa Chaki; Sayka  Jahan; Md. Foyzul Hassan  Fahad; Shams Muhammad Galib; A B M Mohsin

doi:10.17017/j.fish.86

Nipa Chaki Aquatic Biodiversity Lab, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh
Sayka Jahan Department of Environmental Science and Technology, Jessore University of Science and Technology, Jessore-7408, Bangladesh
Md. Foyzul Hassan Fahad Aquatic Biodiversity Lab, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh
Shams Muhammad Galib Aquatic Biodiversity Lab, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh
A B M Mohsin Aquatic Biodiversity Lab, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh

Keywords: Freshwater environment, Atrai River, fish diversity, fish conservation, population trend

Abstract

The fish fauna of the Atrai River were studied for a period of two years from January 2011 to December 2012. Sampling was carried out by several fishing nets and traps on fortnight basis. A total of 74 fish species belonging to 27 families and 52 genera were recorded. Cyprinidae was the most dominant family contributing 18 species in 9 genera. Two alien species were found- Hypophthalmichthys molitrix and Hypostomus plecostomus. Thirty locally threatened species (Vulnerable 13.51%, Endangered 18.92% and Critically Endangered 8.11%) were recorded. But, no globally threatened species was found. Relative abundance of majority 36.49% species was rare. Global population trend of 24.32% recorded fish species was Declining. The highest number of species (42) was recorded in the November 2011. Whereas, the lowest the number of fish species (12) recorded in June and August 2011. Very high correlation was found between fish species and physical environmental parameters (air temperature, water temperature, and water transparency). This study concluded that Atrai River could be an excellent place for natural conservation of fish species. Nevertheless, efforts to maintain a sustainable fishing pressure, removal of existing alien species and avoiding further introduction of such species are recommended.

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