Article

Journal of Coastal Conservation

, Volume 15, Issue 1, pp 163-180

First online:

Environmental variables and fisheries diversity of the Naaf River Estuary, Bangladesh

  • M. Shah Nawaz ChowdhuryAffiliated withInstitute of Marine Sciences and Fisheries, University of Chittagong Email author 
  • , M. Shahadat HossainAffiliated withDepartment of Ecosystem Science & Management, Texas A & M University
  • , Nani Gopal DasAffiliated withInstitute of Marine Sciences and Fisheries, University of Chittagong
  • , Prabal BaruaAffiliated withFisheries and Aquaculture Division, Department of Zoology, University of Calcutta

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Abstract

The Naaf River estuary is one of the large estuaries in the Bangladesh coastal region not to have been affected by extensive human disturbance. This research provides information about the fisheries diversity status by Estuarine Set Bag Net (ESBN) sampling relation to physicochemical variables in both spatio-temporal scales. About 25 km of the lower estuary was divided into six zones for sample collection by considering the accessibility and availability of the ESBN operation, fish landing centers and location of the fishing villages. In total 48 samples have been analyzed which were taken throughout March to October 2006. To quantify the species diversity, all fisheries data were analyzed by using EstimateS and EcoSim software which accounts the different diversity indices viz., species richness, Shannon–Wiener diversity Index, Dominance and Evenness index. The research results demonstrate that the Naaf River estuary is a habitat of 161 (species richness, Sobs = 161, Choa 1 = 162 ± 2.34, ACE = 161.73) different species which belong to 98 fin fishes, 23 shrimps and prawns, 13 crabs, 11 molluscs, 3 echinoderms, 4 other crustaceans; while 9 remain unidentified. Results on the aquatic environment, mainly salinity and turbidity were found to have a major influence on their occurrence and distribution. All the findings indicated that the Naaf River estuary is a highly productive system and provides a favourable environment for large variety of estuarine species assemblages.

Keywords

Fisheries diversity Aquatic environment Naaf River Estuary Diversity index ESBN Species assemblages Habitat Productive system Favourable environment