Zebrafish tank close-up 3
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Zebrafish photographed in a UK animal research establishment in November 2007. Fish are the third most commonly used animals in research after mice and rats. Please acknowledge © Understanding Animal Research.
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Fish are the third most commonly used animals in research after mice and rats, accounting for around 9% of all procedures. The zebrafish, a 5-cm freshwater fish, has become the animal model of choice for many developmental biologists. This fish has the advantage for genetics of having a brief (3-month) generation time and prolific egg production, and its transparent, rapidly developing embryos are ideal for developmental study. By injecting small pieces of DNA into the fish embryo, fish can be genetically modified and the effects of this studied. This allows scientists to identify genes and their specific role during development.
