Species Details

@Norén, Michael - FishBase staff (www.fishbase.in)

Zebra Danio Did you see this animal?

Scientific Name : Danio rerio
Family : Cyprinidae
Order : Cypriniformes
Class : Actinopterygii
Phylum : Chordata
Habitat : Stagnant water bodies,Rice fields,Streams,Canals,Ditches,Ponds,Beels
Description : The zebrafish gets its name from the five blue stripes running along its body, which resemble a zebra's stripes and extend to its tail. It has a streamlined shape with its mouth facing upward. Male zebrafish have gold stripes between the blue ones, while females have a white belly and silver stripes instead of gold. Adult females have a small bump in front of their back fin. Zebrafish are usually 1.8 to 3.7 cm long in the wild, but they can reach up to 4–5 cm. They typically live for two to three years in captivity, but in ideal conditions, they can live over five years. In the wild, they usually live for about a year.

Zebrafish reproduce every few days, and they need a male around for this to happen. They lay hundreds of eggs in each batch, and these eggs become transparent shortly after fertilization, which is useful for research. Zebrafish embryos develop quickly, with the beginnings of major organs appearing within 36 hours. The adults reach reproductive maturity in a few months.

To encourage zebrafish to spawn, researchers create conditions that simulate the shore of a river in their tanks, reducing the water depth. They spawn best in the morning due to their internal rhythms. One pair of zebrafish can lay hundreds of eggs in one morning. Males tend to prefer females with more distinct markings, but in groups, they will mate with any females they find.

Zebrafish are omnivores, mainly eating tiny organisms like plankton, insects, and their larvae. They can eat other foods like worms and small crustaceans when their preferred options are scarce. In research, adult zebrafish are often fed with brine shrimp or paramecia. Researchers use zebrafish as a model for various studies because of their transparency and rapid development.

On a side note, exposure to a chemical called DINP, commonly found in plastic items, can affect zebrafish's reproductive system in different ways depending on their sex.
Distribution in Bangladesh
description written by: Zarin Tasnim, Department of Zoology,Universityof Dhaka; Information sources: www.fishbase.in, Encyclopedia of flora and fauna of Bangladesh(volume 23).photo credit and copyright:Norén, Michael - FishBase staff ([email protected] ),www.fishbase.in. more information please contact with us.