Rohu

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Rohu
Labeo rohita.JPG
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Subfamily: Labeoninae
Genus: Labeo
Species: L. rohita
Binomial name
Labeo rohita
F. Hamilton, 1822
Synonyms
  • Cyprinus rohita Hamilton, 1822

The rohu, rui, or roho labeo (Labeo rohita) is a species of fish of the carp family, found in rivers in South Asia. It is a large omnivore and extensively used in aquaculture.

Description[edit]

The rohu is a large, silver-coloured fish of typical cyprinid shape, with a conspicuously arched head. Adults can reach a maximum weight of 45 kg (99 lb) and maximum length of 2 m (6.6 ft), but average around 12 m (1.6 ft).[2]

Distribution and habitat[edit]

The rohu occurs in rivers throughout much of northern and central and eastern India,[3] Pakistan, Bangladesh, Nepal and Myanmar, and has been introduced into some of the rivers of Peninsular India and Sri Lanka.[1][2]

Ecology[edit]

The species is an omnivore with specific food preferences at different life stages. During the early stages of its lifecycle, it eats mainly zooplankton, but as it grows, it eats more and more phytoplankton, and as a juvenile or adult is a herbivorous column feeder, eating mainly phytoplankton and submerged vegetation. It has modified, thin hair-like gill rakers, suggesting that it feeds by sieving the water.[4]

Rohu reach sexual maturity between two and five years of age. They generally spawn during the monsoon 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.[2]

Aquaculture[edit]

The rohu is an important aquacultured freshwater species in South Asia.[5] When cultured, it does not breed in lake ecosystems, so induced spawning is necessary.[6][7] The rohu is also prized as a game fish.[1]

Preparation as food[edit]

Fried Rohu dish, Bangladesh.

Rohu is very commonly eaten in Bangladesh, Nepal and the Indian states of Tripura, Bihar, Odisha, Assam, West Bengal and Uttar Pradesh.[3] A recipe for fried Rohu fish is mentioned in Manasollasa, a 12th century Sanskrit encyclopedia compiled by Someshvara III, who ruled from present-day Karnataka. In this recipe, the fish is marinated in asafoetida and salt after being skinned. It is then dipped in turmeric mixed in water before being fried.[8]

References[edit]

  1. ^ a b c Dahanukar, N. (2010). "Labeo rohita". IUCN Red List of Threatened Species. IUCN. 2010: e.T166619A6248771. Retrieved 24 April 2016. 
  2. ^ a b c Froese, Rainer and Pauly, Daniel, eds. (2013). "Labeo rohita" in FishBase. May 2013 version.
  3. ^ a b http://www.agrifarming.in/rohu-fish-farming/
  4. ^ "Composite fish culture". Kerelaagriculture.gov.in. Retrieved 2012-03-10. 
  5. ^ Food and Agriculture Organization of the United Nations, Cultured Aquatic Species Information Programme: Labeo rohita (Hamilton, 1822), http://www.fao.org/fishery/culturedspecies/Labeo_rohita/en
  6. ^ de Graaf, G.; Latif, A. (2002). "Development of freshwater fish farming and poverty alleviation - A case study from Bangladesh" (PDF). Aquaculture Asia. 7 (2): 5. 
  7. ^ Nandeesha, M.C. (1990). "Induced spawning of Indian major carps through a single application of Ovaprim-C". Asian Fisheries Society. Retrieved 23 January 2017. 
  8. ^ K.T. Achaya (2003). The Story of Our Food. Universities Press. p. 85. ISBN 978-81-7371-293-7.