Changes

[[Image:Fishes.jpg|thumb]]

[[Image:Fishes.jpg|thumb]]

'''Fish''' are aquatic cold-blooded [[vertebrates]] with fins and scales. Many [[species]] of fish are often kept as pets in containers known as [[aquarium]]s.  Fish are generally divided into two groups: [[freshwater]]-dwelling and [[saltwater]]-dwelling, and fish from one group are generally unable to survive in the environment of the other.  There are, however, a small number of species that move between saltwater and freshwater at different stages of their lives.  Humans consume several types of fish, which is a source of animal protein.

'''Fish''' are [[aqua]]tic cold-blooded<ref>{{cite book|title=The Book of Dreams|author=Brian Innes|isbn=978-1-905704-21-7|publisher=Amber Books Ltd|page=230}}</ref> [[vertebrates]] with fins and scales. Many [[species]] of fish are often kept as pets in containers known as [[aquarium]]s.  Fish are generally divided into two groups: [[freshwater]]-dwelling and [[saltwater]]-dwelling, and fish from one group are generally unable to survive in the environment of the other.  There are, however, a small number of species that move between saltwater and freshwater at different stages of their lives.  Humans consume several types of fish, which is a source of animal protein.

The largest freshwater fish ever found was a 646-pound giant [[catfish]] found in the Mekong River in [[Thailand]] in 2005.<ref>http://news.nationalgeographic.com/news/2005/06/photogalleries/giantcatfish/</ref>

The largest freshwater fish ever found was a 646-pound giant [[catfish]] found in the Mekong River in [[Thailand]] in 2005.<ref>http://news.nationalgeographic.com/news/2005/06/photogalleries/giantcatfish/</ref>