Country Species Summary

Danio rerio (Hamilton, 1822)
Family:	Cyprinidae (Minnows or carps)	picture (Darer_m0.jpg) by Noren, M.
Order:	Cypriniformes (carps)
Class:	Actinopterygii (ray-finned fishes)
FishBase name:	Zebra danio
Max. size:	3.8 cm SL (male/unsexed; Ref. 41236)
Environment:	benthopelagic; pH range: 6 - 8; dH range: 5 - 19
Climate:	tropical; 18 - 24°C; 33°N - 8°N
Global Importance:	fisheries: of no interest; aquarium: highly commercial
Resilience:	High, minimum population doubling time less than 15 months (tmax=5.5 (in captivity); tm<1; multiple spawning per year; Fec=400-500)
Distribution:	Asia: Pakistan, India, Bangladesh, Nepal and Myanmar (Ref. 41236). Reported from Bhutan (Ref. 40882). Appearance in Colombian waters presumably by escape from an aquarium fish rearing facility (Ref. 1739).
Diagnosis:	Vertebrae: 31-32. Five uniformly, pigmented, horizontal stripes on the side of the body, all extending onto the end of caudal fin rays. Anal fin distinctively striped. Lateral line absent. Rostral barbels extend to anterior margin of orbit; maxillary barbels end at about middle of opercle. Branched anal fin rays 10-12. Vertebrae 31-32.
Biology:	An annual species. Adults inhabit streams, canals, ditches, ponds and beels (Ref. 1479). Occur in slow-moving to stagnant standing water bodies, particularly rice-fields (Ref. 4832); and lower reaches of streams (Ref. 58912). Common in rivulets at foot hills (Ref. 41236). Feed on worms and small crustaceans (Ref. 7020); also on insect larvae. Breed all year round (Ref. 58913). Spawning is induced by temperature and commences at the onset of the monsoon season (Ref. 58913). Food availability also acts as cue for breeding (Ref. 58913). Growth rate is a vital guiding environmental factor for sexual differentiation for this species as observed in a study (Ref. 58948). In this same study, frequency and amount of food prior to and throughout gonadal differentiation period resulted in more individuals differentiating to become females and is more pronounced in hybrid than pure bred groups (Ref. 58948). Often used for mosquito control (Ref 6351). Popular for aquarium purposes (Ref. 44325). Used as a model system (=organism) for developmental biology (Ref. 47810). Aquarium keeping: in groups of 5 or more individuals; minimum aquarium size 60 cm (Ref. 51539)
Threatened:	Not Evaluated, see IUCN Red List , (Ref. 36508)
Dangerous:	harmless
Coordinator:
Main Ref:	Talwar, P.K. and A.G. Jhingran. 1991. (Ref. 4832)
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Bhutan country information
Common names:	[ No common name ]	Ref:
Status:	native	Ref:
Salinity:	freshwater
Regulations:	no regulations	Ref:
Uses:	no uses
Comments:	Found in Sarbhang Khola river (Ref. 40882).
Country Information:	www.cia.gov/cia/publications/factbook/geos/bt.html
Occurrences:	Occurrences Point map
Main Ref:	Petr, T., 1999
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Entered: Pablico, Grace Tolentino

CGNET - US

Page created by: Eli, 20.10.03, last modified by Eli, 26.06.07

	Ref.:		Glossary
		(e.g. 9948)		(e.g. cephalopods)
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