Well, some fish open and close their mouth while swimming.
No. Birds, fish and reptiles are each a classification of "vertebrates" of their own. They all have quite different characteristics.
What is the unusual characteristics of the clown fish?
it is a fish in shell
Yes, they have all the characteristics of other fish.
the characteristics of a fish are slimey,wet,scaley
It would not be a puffer fish.
Perch have many distinctive characteristics for a fish. These fish are most abundant in lakes and usually have a yellow and green striped pattern.
One is the devolution of fish.
they breathe with their lungs
the inhabitants could have special adaptations, such as fish have gills that allow them to breathe under water.
fish can be different
Fish do eat starfish depending on the eatign characteristics