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New Fish Tank Tips: Learn about the fish tank nitrogen cycle. This is a crucial process that you must understand if you want to have long term success with tropical fish.
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The zebrafish or zebra danio, Danio rerio, a tropical freshwater fish belonging to the minnow family (Cyprinidae).[1] It is a popular aquarium fish, frequently sold under the trade name zebra danio, and is also an important model organism in scientific research.
The zebrafish is a derived member of the genus Danio. It has a sister group relationship with Danio kyathit.[2]
The zebrafish is native to the streams of the southeastern Himalayan region.[2] It arose in the Ganges region in Eastern India and is also native to Pakistan, Bangladesh, Nepal, and Myanmar.[citation needed] It commonly inhabits streams, canals, ditches, ponds, and slow-moving to stagnant water bodies, including rice fields.[citation needed]
Zebrafish have been introduced in aquariums in Japan, Canada, the United States and Australia.[3] They have also been sighted in Colombia, presumably having escaped from an aquarium.
The fish is named for its five uniform, pigmented, horizontal blue stripes on the side of the body, all of which extend to the end of the caudal fin. Males are torpedo shaped and have gold stripes between the blue stripes; females have a larger, whitish belly and have silver stripes instead of gold. The zebrafish grows to 6.4 cm (2.5 inches), lives for around 5 years, and produces 300-500 eggs per spawning.
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