Clownfish is a small, brightly colored marine fish belonging to the subfamily Amphiprioninae in the family Pomacentridae. They are well-known for their distinctive orange bodies with white bands outlined in black. Clownfish typically inhabit coral reefs in the warm waters of the Pacific and Indian Oceans.

Arowana fish, often referred to as "dragon fish," are a family of freshwater fish known for their elongated bodies and metallic sheen. They belong to the family Osteoglossidae and are found in various regions, including Southeast Asia, South America, and Australia.

Koi fish, or Nishikigoi, are a domesticated and colorful variety of the Amur carp that have been bred for ornamental purposes. These fish are highly regarded in many cultures, particularly in Japan, where they symbolize luck, prosperity, and friendship. Koi come in various colors and patterns, with some of the most popular varieties being Kohaku (white with red), Taisho Sanke (white with red and black), and Showa Sanke (black with red and white).

Betta fish, scientifically known as Betta splendens, are freshwater fish native to Southeast Asia, particularly in the Mekong River basin. Known for their vibrant colors and flowing fins, they are popular in the aquarium trade. Bettas display a variety of colors, including red, blue, green, and purple, often exhibiting striking patterns.

Oscar, also known as Oscar fish, is a popular freshwater species belonging to the cichlid family. Scientifically classified as Astronotus ocellatus, these fish are recognized for their vibrant colors and distinct patterns, which can vary significantly among individuals. Oscars are native to the rivers and lakes of South America, particularly in the Amazon Basin.