Tubifex tubifex, also called the sludge worm or sewage worm, is a species of tubificid segmented worm which inhabits the sediments of lakes and rivers on several continents. However, when temperature dropped during winter, sale became reduced sometimes no selling was also observed during this time.Tubifex, in Aa River (north of France) in a polluted zone, circa 1990 Except winter, average annual income was recorded 13,140,000 Tk from the 12 aquarium shops. There is a good domestic market which is increasing day by day. In the present study the market is mainly domestic. They bred aquarium fish all over the year. During this survey, it was found that the breeders used cement tank, glass aquaria, plastic tank and even plastic jar as culture tanks. The most profitable large aquarium fishes were Gold fish which made a profit of (100☒0 tk/pair), Black moor (150☒0 tk/pair), Red parrot (250±50 tk/pair), angelfish (100☑0 tk/pair), Pearl gourami (300±50 tk/pair), Guppy (400±50 tk/pair), Siamese Fighting Fish (300±50 tk /piece), Tiger Shark (40☑0 tk/pair), Sucker mouth catfish (50±5 tk/pair) to the retailers.

and finally, the shopkeepers sold them to the aquaria owners.

Importers/wholesalers and breeders marketed them to retailers, local breeders, shopkeepers, etc. All aquarium fish species were brought from catabon area of Dhaka city that were mainly imported from the international markets like India, Singapore, Thailand, etc. In the study area, some ornamental fishes such as Gold fish, Black Knife fish were the rare fish of the Khulna city. A total 12 shops were established in this district where 46 aquarium fish species were found of which 12 species were bred for fry production.

An investigation was carried out to provide an initial assessment of aquarium fish trade from December 2018 to May 2019 in Khulna city, Khulna of Bangladesh.

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