angelfish
One example of a brightly colored fish that starts with an "o" is the Ocellaris Clownfish, also known as the "false percula clownfish." These fish have vibrant orange bodies with white stripes.
Although I'm not sure what you mean by "deep" body, Betta fish, or Siamese Fighting Fish, or Rumble Fish (if you're S.E. Hinton) are thin, brightly-colored (domestically bred males tend to be more colorful), and have long, wavy fins.
Opah, also known as the sunfish.
Jackfish
Albacore, anchovy, angel fishThe Angler fish.
fish
· Walleye
Uaru is a fish found in the Amazon. It begins with the letter U.
One fish that begins with the letter A is an anchovy.
The Garibaldi is a brightly colored orange fish of the damselfish family that is native to the North-Eastern subtropical parts of the Pacific Ocean.
the answer to the European fresh water fish that begins with r is Rudd
fish