Should I feed this to my fish?

I saw in a cartoon some time back, if you feed a fish radioactive material, it will turn into a mutant fish. Although I do love my fish, 14 in all, I also would like to privilege them into having extraordinary traits. If this works, I could be looking at honors and bragging rights among friends and colleges. On the other hand, if this doesn't work out the way I desire, I could ultimately kill all of my fish and waste quite some money on the de-weaponized uranium I plan on purchasing. Of course I could split the fish in groups and test different amounts of the substance, I wouldn't dare risk any of their lives. I've had these fish for nearly 6 years and wouldn't appreciate losing any of them in a risky experiment so please only answer if you have knowledge of this matter. Please list a source as well! Thanks.