Author(s): Md. Robiul Awal Hossain, Md. Ashikur Rahman, Shirin Akter, Md. Eilious Hosain and M Niamul Naser

Abstract: The study was undertaken to represent the comparison of availability of fish species before and after intervention of Tilapia cage culture in the Dakatia River. Data were collected on the basis of surveying from local cage farmers, local fishers and fish retailer of local markets. The study was conducted in the five different cage culture areas of the River Dakatia at Chandpur Sadar Upazilla for two years from July/2014 to June/16 on monthly basis. Fishes from twenty four different families under different orders such as Pleuronectiformes, Syngnathiformes, Angulliformes, Tetraodontiformes, Cypriniformes, Clupeiformes, and Perciformes were available in those areas. Before the intervention of tilapia cage culture total numbers of available fish species were 75 and after intervention of the cage culture the number becomes 77 because two species tilapia and Nile tilapia/Nilotica were added in those areas. Higher number of fish species found under Cypriniformes and the number was forty-four which comprised 57% and family Cyprinidiae comprised 25 species which is 32% of total fish species found in this study. The feed which supplied to the cage not only used by that Tilapia and Nilotica but also other fish species that habited in those areas. Therefore, Tilapia cage culture in the Dakatia River was found not threatened to local fish diversity but it helped to increase the production of local species as well as cultured species.

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