On petco.com some of the fish are classified as being able to live in saltwater, freshwater, or a marine environment. I was wondering if the term marine environment meant that it was capable of living in both fresh and saltwater. If not please explain what it means.
If you look at the info box it says this is a saltwater fish:
http://www.petco.com/product/101759/Blue-Hepatus-Tang.aspx?CoreCat=Saltwater Fish
This one says freshwater:
http://www.petco.com/product/101083/Electric-Yellow-Cichlid.aspx?CoreCat=LN_Shopping_LiveFishandRock_FreshwaterFish
But this one says marine:
http://www.petco.com/product/104888/Coral-Banded-Shrimp.aspx?CoreCat=Corals Invertebrates
Please Help!