Denison barb

The Denison barb, Denison's barb, Miss Kerala, red-line torpedo barb, or roseline shark (Sahyadria denisonii) is an endangered species of cyprinid fish endemic to the fast-flowing hill streams and rivers of the Western Ghats in India.[2][3] It is commonly seen in the aquarium trade; pet collection caused it to become endangered and is its single major threat.[1][4][5]

Denison barb
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Genus: Sahyadria
Species:
S. denisonii
Binomial name
Sahyadria denisonii
(F. Day, 1865)
Synonyms
  • Labeo denisonii F. Day, 1865
  • Barbus denisonii (F. Day, 1865)
  • Crossocheilus denisonii (F. Day, 1865)
  • Puntius denisonii (F. Day, 1865)

Physical characteristics

The fish is characterized by a torpedo-shaped body with silver scales, a red line running from their snout, through the eye, back towards the middle of the body; and below the red line, a black line that runs the length of the fish to the tail. As they mature, a distinctive green/blue marking on top of the head develops. This species reputedly reaches a length of 15 centimetres (5.9 in) TL,[2] but typically will only reach 9–11 centimetres (3.5–4.3 in).[4] They are active shoaling fishes.[4]

The species was described by Francis Day and named after Sir William Denison.[6]

Habitat and threats

Denison barb is endemic to the Achenkovil, Pamba and Chaliyar rivers. Specifically, they are found in four locations — Cheenkannipuzha (a major tributary of Valapattanam River), the Achankovil river, the Chaliyar river and near Mundakayam town.[7] The species has an estimated range of 8,805 km2 (3,400 sq mi). S. denisonii is a benthopelagic species that is gregarious and shoals are known to occur in rocky pools with thick vegetation along their banks. They thrive in a subtropical climate in water with a 6.8–7.8 pH, a water hardness of 5–25 dGH and a temperature range of 65 to 79 °F (18 to 26 °C).

As reported by Practical Fishkeeping in January 2009, new research by team of scientists from India suggests that the species is being over-exploited for the aquarium trade, potentially placing it at risk of extinction.[8] In spite of being listed as endangered by local assessment reports[9] the fish had been promoted as an 'export item' by several government agencies. The population structure, age, growth, mortality and harvest intensity in the Valapattanam River was studied and suggests that the species is being over-exploited.[10]

The fish was most likely collected and exported out of India in 1996. In 1997, it won the third prize at 'Aquarama 1997' (world exhibition on Ornamental fish) under the 'New Species Category'.[11] By 2007-08 it constituted about 60- 65% of the total live ornamental fish exported from India which was worth US$1.54 million. Though the Government of Kerala banned the fishing and export of the endangered barb, it is yet to be listed under the National Wildlife Protection Act.

In the aquarium
A school of Denison barbs in a home aquarium

This fish is a relatively new addition to the fish keeping hobby. The Denison's barb is a schooling fish that is usually kept in groups. It tends to be peaceful but some have been known to be slightly aggressive around food, especially if kept in less space than they require. They eat bloodworms, shrimp, meat, fish flake and some vegetation. A similar fish, Sahyadria chalakkudiensis is sometimes confused with this fish, but it is a larger, less colourful and a more aggressive species.

Breeding

Over the years many efforts have been made to breed this rapidly depleting species in captivity, initially with limited success. In 2009, success came from the work carried out at the Fisheries College, Kerala by Dr.T. V. Anna Mercy. Breeding efforts have also been carried out by Chester Zoo and two amateur fish-lovers from Chennai (India), Venkatesh and Murali.[7] These efforts may pave the way for standardizing the process and would be a major boost to conservation and the ornamental fish trade in India. Large numbers are now being bred in captivity at commercial facilities.[4][12]

See also

References
  1. Ali, A., Raghavan, R. & Dahanukar, N. 2011. Sahyadria denisonii. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 28 November 2013.
  2. Froese, Rainer and Pauly, Daniel, eds. (2013). "Sahyadria denisonii" in FishBase. October 2013 version.
  3. Raghavan, R., Philip, S., Ali, A. & Dahanukar, N. (2013): Sahyadria, a new genus of barbs (Teleostei: Cyprinidae) from Western Ghats of India. Archived 2013-12-02 at the Wayback Machine Journal of Threatened Taxa, 5 (15): 4932-4938.
  4. Seriously Fish: Sahyadria denisonii. Retrieved 26 June 2014.
  5. Sajan,S (2017): Life History traits of an Endangered barb
  6. Day, F. (1865). "On the fishes of Cochin, on the Malabar Coast of India. Part II. Anacanthini". Proceedings of the Zoological Society of London: 286–318.
  7. Mathew, Dennis Marcus (1 February 2010). "'Miss Kerala' gets a protective shield". The Hindu. Retrieved 18 January 2020.
  8. Practical Fishkeeping(11 January 2009), Kerala government bans fishing for this species."Archived copy". Archived from the original on 5 June 2011. Retrieved 26 November 2010.CS1 maint: archived copy as title (link)
  9. Molur, S. and Walker, S., Report of the workshop on ‘Conservation Assessment and Management Plan for Fresh Water Fishes of India’, Zoo Outreach Organization and NBFGR, Lucknow, 1998,p. 156.
  10. SAJAN,S., T.V. ANNA MERCY AND V. MALIKA,Asian Fisheries Science 28 (2015):130-142, http://www.asianfisheriessociety.org/publication/abstract.php?id=1082
  11. Raghavan, R. et al., Aquat. Conserv: March Freshwater Res., 2009, 19, 67–74.
  12. T. V. Anna Mercy, S. Sajan, V. Malika (2015) Captive breeding and developmental biology of Sahyadria denisonii (Day 1865) (Cyprinidae), an endangered fish of the Western Ghats, India. Indian Journal of Fisheries 62(2).
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