Middle-East Journal of Scientific Research 28 (4): 286-295, 2020 ISSN 1990-9233 © IDOSI Publications, 2020 DOI: 10.5829/idosi.mejsr.2020.286.295 Corresponding Author: Md. Rajib Sharker, Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh. 286 Impact of Island on Fish Diversity and Fisherman Community in Palordi River, Bangladesh Diba Kar, Shaharior Hossen, Md. Rajib Sharker, 1 2 2 Md. Foysul Hossain, Md. Abdul Hannan, Layla Khasrun Zannat, 3 4 5 Mir Mohammad Ali, Prosun Roy and Md. Ashik Al Faisal 6 7 8 Department of Fisheries Management, 1 Bangladesh Agricultural University, Mymensingh 2202, Bangladesh Department of Fisheries Biology and Genetics, 2 Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh Department of Aquatic Environment and Resource Management, 3 Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh Department of Aquatic Animal Health Management, 4 Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi 6205, Bangladesh 5 Department of Aquaculture, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh 6 Department of Aquaculture, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh 7 Department of Aquaculture, Patuakhali Science and Technology University, Patuakhali 8602, Bangladesh 8 Abstract: The present study was conducted to denote the impact of island on the Palordi River during the period from August 2016 to July 2017. Availability of fish in present time is less than the past time, which represent the main impact of island. Study revealed 39 fish species belonging to 9 orders, 13 families and 35 genera from Palordi River. The dominant order was Cypriniformes (12 species) followed by Perciformes (8 species), Siluriformes (7 species) and Clupeiformes (5 species). Four critically endangered, 7 endangered and 5 vulnerable fish species of Bangladesh were also recorded along with 1 alien silver carp species. Eight types of nets, 4 types of traps, 2-3 types of spears and harpoons and 3 types of hooks and lines were found to be used in the river both traditionally and commercially. Island in palordi river were causes the loss of biodiversity. Large portion of fishermen (72%) were migrate in other professions due to reduced annual income (15, 000-25, 000 BDT) from fishing. Necessary steps should be taken to develop the awareness, government approaches, climate change and management policy, among the people about that impact. Key words: Fish Fishing gear Island Biodiversity loss Fishermen River INTRODUCTION confluence of a major system of rivers in one of the Bangladesh is known as riverine country and Bangladesh consists of canals, rivers, beels, haors, oxbow fisheries sectors plays a significant role in socioeconomic lakes and flood plain [21-26]. There are 289 native fresh improvement of Bangladesh [1-9]. The Inland water water species, 475 marine fish, 24 freshwater prawn, 36 resources of Bangladesh are considered to be one of the shrimp and 12 exotic fish species, enhance the fisheries richest resources in the world both in area and potential resource of Bangladesh [27-29]. Freshwater fish diversity for Fisheries Development [10-15]. The richness of is considered as the most threatened taxonomic group due Bangladesh’s fish diversity and high productivity comes to their high sensitivity to the qualitative and quantitative from the geographical position of the country at the change of aquatic habits [30-37]. The open water bodies world’s biggest deltas [16-20]. The fisheries resource of