Fish have scales. Scales are what cover the bodies of fish. Scales overlap each other and are unique to the species of the fish. Their scales can get rather slimy, but that’s okay, because it helps them to move through the water.

What are the 7 main characteristics of fish?

• Fishes are aquatic; cold blooded vertebrates.
• Their body is divisible into head, trunk and tail. …
• It has a spindle shaped body. …
• The body is covered by scales. …
• Respiration is by gills. …
• On the head a pair of nostrils are present internal nostril are absent. …
• On the head a pair of eyes is present.

How are fish and mammals alike?

Fish, reptiles, amphibians, birds and mammals all have bones. Fish, reptiles and amphibians are cold-blooded animals. Scientists believe that fish were the first animals to develop bones. … Unlike amphibians, they have lungs and breathe oxygen from the air from the time they are hatched from their eggs.