Didn't Michael Crichton write this story a long time ago?
My favorite lines from the article:
Readers with long memories may recall GeneDupe's previous attempt to break into the pet market, the Real Goldfish. This animal was genetically engineered to deposit gold in its skin cells, for that truly million-dollar look. Unfortunately Dr Fril, a biologist, neglected to think about the physics involved. The fish, weighed down by one of the heaviest metals in existence, sank like a stone, as did the project.
At any rate, I'm waiting for the kid's lab version.