The rohu, rui, ruhi or roho labeo (''Labeo rohita'') is a species of fish of the carp family, found in rivers in

South Asia South Asia is the southern Subregion#Asia, subregion of Asia that is defined in both geographical and Ethnicity, ethnic-Culture, cultural terms. South Asia, with a population of 2.04 billion, contains a quarter (25%) of the world's populatio ...

. It is a large

omnivore An omnivore () is an animal that regularly consumes significant quantities of both plant and animal matter. Obtaining energy and nutrients from plant and animal matter, omnivores digest carbohydrates, protein, fat, and fiber, and metabolize t ...

and extensively used in

aquaculture Aquaculture (less commonly spelled aquiculture), also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants (e.g. Nelu ...

Description

The rohu is a large, silver-colored fish of typical

cyprinid Cyprinidae is a Family (biology), family of freshwater fish commonly called the carp or minnow family, including the carps, the true minnows, and their relatives the barb (fish), barbs and barbel (fish), barbels, among others. Cyprinidae is the ...

shape, with a conspicuously arched head. Adults can reach a maximum weight of and maximum length of , but average around .

Distribution and habitat

The rohu occurs in rivers throughout much of northern and central and eastern

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country# ...

Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...

Bangladesh Bangladesh, officially the People's Republic of Bangladesh, is a country in South Asia. It is the List of countries and dependencies by population, eighth-most populous country in the world and among the List of countries and dependencies by ...

Nepal Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia. It is mainly situated in the Himalayas, but also includes parts of the Indo-Gangetic Plain. It borders the Tibet Autonomous Region of China Ch ...

and

Myanmar Myanmar, officially the Republic of the Union of Myanmar; and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and has ...

, and has been introduced into some of the rivers of Peninsular India and

Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...

Ecology

The species is an omnivore with specific food preferences at different life stages. During the early stages of its lifecycle, it eats mainly

zooplankton Zooplankton are the heterotrophic component of the planktonic community (the " zoo-" prefix comes from ), having to consume other organisms to thrive. Plankton are aquatic organisms that are unable to swim effectively against currents. Consequent ...

, moving onto

phytoplankton Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater Aquatic ecosystem, ecosystems. The name comes from the Greek language, Greek words (), meaning 'plant', and (), mea ...

in later stages of life. Rohu are herbivorous column feeders, eating mainly phytoplankton and submerged vegetation. It has modified, thin hair-like gill rakers, which it uses to feeds by sieving the water. Rohu reach sexual maturity between two and five years of age. They generally spawn during the

monsoon A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annu ...

season, keeping to the middle of flooded rivers above tidal reach. The spawning season of rohu generally coincides with the southwest monsoon. Spawn may be collected from rivers and reared in tanks and lakes. The Rohu can be infested by the acanthocephalan parasite '' Paraechinorhynchus kalriai'' which attaches to the inner lining of the small intestine.Bilqees, F. M., & Aly Khan, A. K. (1983). Paraechinorhynchus kalriai ng, n. sp.(Neoechinorhynchidea: Neoechinorhynchinae) from Labeo rohita (Ham).

Aquaculture

The rohu is an important

d freshwater species in South Asia. When cultured, it does not breed in lake ecosystems, so induced spawning is necessary. The rohu is also prized as a game fish. Labeo rohita at traditional holiday market

Labeo rohita at traditional holiday market

Preparation as food

Rohu is very commonly eaten in

Bhutan Bhutan, officially the Kingdom of Bhutan, is a landlocked country in South Asia, in the Eastern Himalayas between China to the north and northwest and India to the south and southeast. With a population of over 727,145 and a territory of , ...

and the

n states of

Tripura Tripura () is a States and union territories of India, state in northeastern India. The List of states and union territories of India by area, third-smallest state in the country, it covers ; and the seventh-least populous state with a populat ...

Nagaland Nagaland () is a States and union territories of India, state in the northeast India, north-eastern region of India. It is bordered by the Indian states of Arunachal Pradesh to the north, Assam to the west, Manipur to the south, and the Naga Sel ...

Bihar Bihar ( ) is a states and union territories of India, state in Eastern India. It is the list of states and union territories of India by population, second largest state by population, the List of states and union territories of India by are ...

Odisha Odisha (), formerly Orissa (List of renamed places in India, the official name until 2011), is a States and union territories of India, state located in East India, Eastern India. It is the List of states and union territories of India by ar ...

Assam Assam (, , ) is a state in Northeast India, northeastern India, south of the eastern Himalayas along the Brahmaputra Valley, Brahmaputra and Barak River valleys. Assam covers an area of . It is the second largest state in Northeast India, nor ...

West Bengal West Bengal (; Bengali language, Bengali: , , abbr. WB) is a States and union territories of India, state in the East India, eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabi ...

Andhra Pradesh Andhra Pradesh (ISO 15919, ISO: , , AP) is a States and union territories of India, state on the East Coast of India, east coast of southern India. It is the List of states and union territories of India by area, seventh-largest state and th ...

Telangana Telangana is a States and union territories of India, state in India situated in the Southern India, south-central part of the Indian subcontinent on the high Deccan Plateau. It is the List of states and union territories of India by area, ele ...

Tamilnadu Tamil Nadu (; , TN) is the southernmost States and union territories of India, state of India. The List of states and union territories of India by area, tenth largest Indian state by area and the List of states and union territories of Indi ...

and

Uttar Pradesh Uttar Pradesh ( ; UP) is a States and union territories of India, state in North India, northern India. With over 241 million inhabitants, it is the List of states and union territories of India by population, most populated state in In ...

. A recipe for fried Rohu fish is mentioned in ''

Manasollasa The ' also known as ''Abhilashitartha Chintamani'', is an early 12th-century Sanskrit text composed by the Kalyani Chalukya king Someshvara III, who ruled in present-day Karnataka. It is an encyclopedic work covering topics such as polity, gove ...

'', a 12th-century Sanskrit encyclopedia compiled by

Someshvara III Someshvara III (; ) was a Western Chalukya king (also known as the Kalyani Chalukyas), the son and successor of Vikramaditya VI. He ascended the throne of the Western Chalukya Kingdom in 1126 CE, or 1127 CE. Someshvara III, the third king i ...

, who ruled from present-day

Karnataka Karnataka ( ) is a States and union territories of India, state in the southwestern region of India. It was Unification of Karnataka, formed as Mysore State on 1 November 1956, with the passage of the States Reorganisation Act, 1956, States Re ...

. In this recipe, the fish is marinated in

asafoetida Asafoetida (; also spelled asafetida) is the dried latex (Natural gum, gum oleoresin) exuded from the rhizome or tap root of several species of ''Ferula'', perennial herbs of the carrot family. It is produced in Iran, Afghanistan, Central As ...

and salt after being skinned. It is then dipped in turmeric mixed in water before being fried. Rohu caught in

Mithila Mithila may refer to: Places * Mithilā, a synonym for the ancient Videha state ** Mithilā (ancient city), the ancient capital city of Videha * Mithila (region), a cultural region (historical and contemporary), now divided between India and Nepa ...

are known as Mithila Rohu Machh (Maithili: मिथिला रोहु माछ) and considered tastier than the Rohu varieties found in the coastal areas. The

State government is currently making efforts to establish a List of geographical indications in India (GI) tag for the fish.

Nutrition

Rohu is rich in Omega 3 fatty acids,

Vitamin A Vitamin A is a fat-soluble vitamin that is an essential nutrient. The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinyl esters, and several provitamin (precursor) carotenoids, most not ...

Vitamin B B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism and synthesis of red blood cells. They are a chemically diverse class of compounds. Dietary supplements containing all eight are referred to as a vita ...

and

Vitamin C Vitamin C (also known as ascorbic acid and ascorbate) is a water-soluble vitamin found in citrus and other fruits, berries and vegetables. It is also a generic prescription medication and in some countries is sold as a non-prescription di ...

. It is also rich in Vitamin D, a Vitamin which is present only in a few foods and consumption of the fish may prevent

Osteoporosis Osteoporosis is a systemic skeletal disorder characterized by low bone mass, micro-architectural deterioration of bone tissue leading to more porous bone, and consequent increase in Bone fracture, fracture risk. It is the most common reason f ...

, a Vitamin D deficiency disease. It is also a good source of high quality protein.

References

{{Authority control Cyprinid fish of Asia Fish of Thailand Fish described in 1822 Labeoninae Fish of Bangladesh