These little fish
grow to only two inches in length, hardly big enough to attract the notice
ofmany, but their size belies their importance in developmental biology.
Zebrafish are native to the Ganges river, but we see them mostly in tropical
fish stores. They can be purchased there for about a dollar apiece. Zebrafish
are easy to keep in captivity. A dozen are quite comfortable
in a 10-gallon aquarium, where they can live, grow and reproduce. They are
normally summer spawners. We can trick them into giving
round by keeping the lights on above their tank for 14 hours each day,
simulating summertime conditions. In that case a well-fed female will deposit
200-300 eggs about twice a week throughout the year.
Photoby Shuo Lin
Here are two
zebrafish, one wild-type and one albino. It's easy to see how zebrafish got
their name. I use various color varieties in studies of how patterns are
established in embryos.
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