Types of pet fish​:Freshwater fish and saltwater fishPet fish can be categorized into freshwater fish and saltwater fish based on their habits. Freshwater fish are further categorized into cold water freshwater fish and tropical freshwater fish, while saltwater fish are categorized into cold water saltwater fish and tropical saltwater fish.

Tropical fish are the most famous pet fish. These fish usually come from tropical regions such as the Amazon River Basin and Southeast Asia. They are usually small and brightly colored, making them a popular choice for many people. Common tropical fish include:

Goldfish 

Goldfish are one of the most popular pet fish, known for their bright orange-red color and elegant swimming position. There are many varieties of goldfish, including the common goldfish, the lionhead goldfish, and the tail-haired goldfish.

Goupee 

Known for their beautiful tails and fins, peacock fish are one of the stars of the tropical fish. They are usually small in size and come in a variety of colors.

Fighting Fish

Fighting fish are known for their unique fighting behavior where males attack each other for territory and mates. They have very beautiful fins and tails.

In addition to tropical fish, cold water fish are an important class of pet fish. These fish usually come from temperate or cold regions and require lower water temperatures. Common cold water fish include:

Koi

Koi are known for their graceful swimming and rich colors and are a favorite of many. They are usually larger and require larger aquariums.

Ornamental Carp

Ornamental carp are similar in appearance to common carp but come in more diverse varieties such as Border Carp and Butterfly Tail Carp. They have high water quality requirements.

Gold Head Snapper

Known for its golden head, the gilthead snapper is a very beautiful cold water fish. They are usually small in size and suitable for small aquariums.