According to the query fish encyclopedia.com, pike is also called pincer fish, is a kind of catfish, mainly from North America, the water quality requirements are higher, must be raised in a clean body of water. And catfish is a large phylum, common in China is the earth catfish also need to be raised with good water quality. Generally dirtier fish is the leather bearded catfish, which is a catfish from the Nile River, resistant to low oxygen also resistant to pollution, can survive in unclean places.