Depot's colour change

Sorry I got excited about Depot going through another color change. I still don't have the program for my digital camera but I wanted to draw her colour changes out so to see them together.
http://tinypic.com/dpk9bs.jpg
The first one is about 4 months, when I got her, they second she was about 6 months, the third is from about two years and the last was her most recent change thats been taking place over the last month or so. I swiped the picture from enchantedlearning.com its a common goldfish (the bottom/5th fish pictured) and then I made changes so it looks like her. Still not sure what exactly Depot is.