important characteristics of fish with vertebrates
Characteristics of the Five Vertebrate Groups. Fish. The body of the fish is covered in scales and has fins attached to help it move through the water. Fish breathe using gills which take oxygen out of the water.When male and female fish mate, the eggs often meet the sperm in the water.This is called external fertilization. Examples of fish are the herring, which lives in the sea, and the pike which is a freshwater fish.Amphibians. The skin of amphibians is very thin and must always be kept wet because amphibians breathe through their skin.his is called external fertilization. Examples of fish are the herring, which lives in the sea, and the pike which is a freshwater fish. Amphibians. The skin of amphibians is very thin and must always be kept wet because amphibians breathe through their skin.