Abstract
The present study revealed that a total of 101 indigenous species of large fish (28 species) and Small Indigenous fish (73 species) belonging to 63 genera and 31 families were observed and identified while 17 exotic fish species were found under 5 families. Among the indigenous species, the highest number of species were found in family Cyprinidae and Bagridae with a relative diversity of 28.28% and 11.11%. In case of group species richness, highest number 27 fish species were found in catfish group followed by 12 species of carp, 8 species of each barbs and minnows, 6 species of eel fish, 8 species of loaches, 4 species of each prawn, snake-headed or airbreathing fish and glass perches, 3 species of each climbing perches and clupeid, 2 species of each goby fish, knifefish and puffer fish, and rest of the group true perch, leaf fish, halfbeak fish, Needlefish, mullet fish, anchovies and killifish has one species. Of the total species, 47 species were considered as least concerned, 10 species as vulnerable, 11 species as endangered, 11 species as critically endangered, 14 species as nearly threatened and 8 species as data deficient. Considering the seasonal variation for all selected areas simultaneously, Shannon-Weaver diversity (H) index were found ranged from 3.53 (May) to 4.37 (January) where the highest Shannon -Weaver diversity index value 4.37 were found in winter season while 3.01 in Phulkumar, 3.73 in Dudhkumar, 3.87 in Dharla, 3.67 in Tista and 3.79 in Brahmaputra were recorded separately.
Highlights
Bangladesh is commonly known as Delta Island in the South-Asian region and situated in the northeastern part of the South Asia and lies between 20°34 ́ and 26°38 ́ North longitudes and 88°01 ́ and 92°41 ́ East latitudes
The present study revealed that a total of 101 indigenous species of large fish (28 species) and Small Indigenous fish (73 species) belonging to 63 genera and 31 families were observed and identified while 17 exotic fish species were found under 5 families
Ali et al [40] studied in Andharmanik river Sanctuary in Bangladesh and found 93 fish species belonging to 66 genera, 45 families and 14 orders where the highest percentage order was Perciformes (27.65%), followed by Cypriniformes (20.21%), Siluriformes (21.28%) Clupeiformes (7.45%) Mastacembeliformes (4.26%) and Channiformes (4.26%)
Summary
Bangladesh is commonly known as Delta Island in the South-Asian region and situated in the northeastern part of the South Asia and lies between 20°34 ́ and 26°38 ́ North longitudes and 88°01 ́ and 92°41 ́ East latitudes. Rivers cover about 479,735 ha area of the total land area and more than 50% of its territory under true wetlands like estuaries (551,828 ha), Haor and Beel (114,161 ha), floodplains (5,486,609 ha), mangrove environments, and the Kaptai Lake (68,800 ha), these are the inherent water resources [5]. These fisheries resources have been playing a vital role in the economic sector and in the nutritional purpose specially for the poor people of Bangladesh. Ditches, oxbow lakes (channel of dead rivers) are some other waterbodies behind with those resources are blessing for Bangladesh
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