''Oreichthys cosuatis'' is a small (~3.2"/8 cm TL)

cyprinid fish Cyprinidae is a family of freshwater fish commonly called the carp or minnow family. It includes the carps, the true minnows, and relatives like the barbs and barbels. Cyprinidae is the largest and most diverse fish family and the largest vert ...

found in

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

and

Bangladesh Bangladesh (}, ), officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most populous country in the world, with a population exceeding 165 million people in an area of . Bangladesh is among the mos ...

.In India it is found along the ganga and brahmaputra river drainage in the states of

West bengal West Bengal (, Bengali: ''Poshchim Bongo'', , abbr. WB) is a state in the eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabitants within an area of . West Bengal is the fourt ...

and

odisha Odisha (English: , ), formerly Orissa ( the official name until 2011), is an Indian state located in Eastern India. It is the 8th largest state by area, and the 11th largest by population. The state has the third largest population of ...

It is also reported from Thailand and Myanmar. They are strictly freshwater, and are found in ditches, ponds, streams and canals.Rahman, A.K.A. (1989): Freshwater fishes of Bangladesh. '' Zoological Society of Bangladesh. Department of Zoology, University of Dhaka. 364 p.''
In an aquarium, they are generally peaceful, and tend not to bother other fishes, even those much smaller than they are although they are susceptible to be bullied by larger more boisterous fish. They prefer cooler water (76 °F/24.4 °C at most, although higher temps are tolerated in the short term providing oxygen levels do not drop). Gentle water flow is preferred and be sure to use a soft substrate as this fish has sensitive bristles which is uses whilst foraging. ''Oreichthys cosuatis'' is found in the

Ganges The Ganges ( ) (in India: Ganga ( ); in Bangladesh: Padma ( )). "The Ganges Basin, known in India as the Ganga and in Bangladesh as the Padma, is an international river to which India, Bangladesh, Nepal and China are the riparian states." is ...

and

Brahmaputra river The Brahmaputra is a trans-boundary river which flows through Tibet, northeast India, and Bangladesh. It is also known as the Yarlung Tsangpo in Tibetan, the Siang/Dihang River in Arunachali, Luit in Assamese, and Jamuna River in Bangla. It ...

systems in India, Bangladesh and

Nepal Nepal (; ne, नेपाल ), formerly the Federal Democratic Republic of Nepal ( ne, सङ्घीय लोकतान्त्रिक गणतन्त्र नेपाल ), is a landlocked country in South Asia. It is mai ...

. This fish favours slow flowing areas of rivers with dense vegetation and clear water. This fish reaches around 40mm with the male growing slightly larger than the females, slightly more colourful and they have an extended dorsal fin

References

Tropical fish Oreichthys Fish described in 1822 Fish of Bangladesh Fish of Myanmar Fish of India Fish of Thailand {{Barbinae-stub