Most "regular" fish, such as the angelfish, have a skeleton made of bone (class osteichthyes, I think). Fish such as sharks, skates, and rays have a skeleton made of cartilage (class chondrichthyes). Even bony fish, though, such as your angelfish, have some cartilage for flexibility. I believe that the baby bony fish, like a human fetus, has pure cartilage until the bone forms. DL
No, a fish is not a mammal. Only a mammal has a backbone.
There are not many fish that are compatible with Angelfish. Only Angelfish are truly compatible with Angelfish.
All Sharks are boneless. But they do have a type of skeleton, called cartilage. But they are not bones.
Millions
There are many types of angelfish that live all over the world. Generally, angelfish live in freshwater where it stays warm most of the time.
they are many fish in the world so the population of a king angelfish is unknown...
200
6 angelfish and 15 guppies
billions, if not trillions.
11
there are a lot of different types of angelfish but the best are the cool beauty angelfish
There are many similarities between angelfish and goldfish- to name one angelfish and fancy goldfish (especially the oranda) both have several long delicate fins.