Fish diversity of Bangshi river, Savar, Dhaka was studied over a period of two consecutive years (July, 2010 to June, 2012. A total of 48 fish species belonging to 39 genera, 18 families and 8 orders were recorded. Siluriformes was the most dominant order comprising 33.33% of all the number of species recorded, followed by the Cypriniformes (31.25%), Perciformes (14.58%), Clupiformes (6.25%), Channiformes (6.25%), Osteoglossiformes (4.16%), Synbranchiformes (2.08%) and Beloniformes (2.08%). The most dominated species of this study were Ailia punctata, Mystus tengra and Puntius sophore and rare species was Bagarius yarrellii. During the study 29 sp. (40.42%) fish species were found to be locally rare, whereas, only 3sp. (6.25% ) were very common and 16 sp. (33.33%) were common in occurrence. Among the fishes, 52.08% was threatened in which vulnerable, endangered and critically endangered were 20%, 36% and 44% respectively.

A study was conducted in two districts namely Bogura and Sirajgang to investigate the marketing channel and the marketing system of fishes captured from the Jamuna river in Bangladesh during a period of two consecutive years from January 2016 to December 2017. Fish captured from the Jamuna river were marketed through three types of market viz. auction market/arat, wholesale market and retail market. Operators of the fish market were the fishermen, faria, aratders, paikers or baparies, whole sellers and retailers. Ten channels were identified through which fish of the Jamuna river were shifted from the fishermen to the consumers. The shortest channel was the fishermen to consumers while the longest one was the fishermen→faria→aratders→paikers→whole seller→retailer→consumers. The highest price of fish (BDT 560/kg) was recorded for Wallago attu in retail market followed by BDT 500/kg for Tenualosa ilisha and Bagarious bagarious while, five small indigenous species (SIS) Tetraodon cutcutia, Chanda nama, Parambassis lala, Parambassis ranga, and Esomus danricus got the lowest price in retail market. Icing, weighing, transportation, capital supply were required in fish marketing channels as supporting function to overcome crisis. Major constrains prevailing in the fish marketing channels were reducing fishing areas, decreasing fish catch per day per fishermen, disturbance by illegal seasonal fishermen, lack of bargaining power and market information, lack of proper fish storage and preservation facilities in the fishing craft and fish markets, wastage of fish due to spoiling during transportation, sanitations, drainage and management problems within the market areas. Res. Agric., Livest. Fish.6(1): 133-142, April 2019

The histo-morphological study of the alimentary canal of two carnivore freshwater snakehead fish Channa punctata and C. striata was carried out from October 2013 to July 2014. It revealed that three major parts like oesophagus, stomach and intestine composed of short thick-walled body. The oesophagus begins with buccopharynx. Structure and arrangement of both villiform and canine teeth on jaws in C. striata are more extendable and stronger than C. punctata and thereby made the former one more successful predator. The availability and arrangement pattern of mucous pits and taste bud pores in oesophagus are also prominent in C. striata. The TS of stomach of both the species has broad GM devoid of goblet mucous cells,  but surface layer CC and basal layer GG open through gastric pits. The length of intestine (16.0 cm) and intestinal pyloric caeca (5.5 cm) in C. striata are larger than C. punctata (7.0 cm and 1.5 cm, respectively). However, the TS of intestinal Sr. 0.05 mm; MM. 0.8 mm; Mu 0.5 mm suggest in favour of carnivore habit of both the species.