http://www.lowndescounty.com/345/Pets-Available-for-Adoption
I take most of the pictures of our PETS for adoption at the Lowndes County, Ga. Animal Shelter. Animals are hard to get still. Cats are easier to catch still for a picture.
Patience and practice. Put your camera setting on Macro. If you have a waterproof camera you can dive into the aquarium! A flash helps stop the motion and freeze the fish in the picture.