Goldfish: Goldfish is a relatively common wide-temperature fish and has a long history of cultivation in my country. Arowana: Arowana is a large ornamental fish native to Southeast Asia. Guppy: Guppy is a very common small tropical fish that has strong adaptability to the environment and is easy to reproduce. Parrot fish: Parrot fish are artificially cultivated ornamental fish and have relatively high demand for oxygen. Koi: Koi does not have high requirements for water quality and has a relatively miscellaneous food habit.

1. Goldfish Goldfish is a relatively common eurythermic fish with a long history of cultivation in my country. It is usually divided into four types, namely grass species, culture species, dragon species and egg species. Among them, grass-type goldfish is the most widely raised species. It not only looks good, but is also easy to raise. Egg breeds are a popular breed in recent years, and they have a round and cute appearance.

2. Arowana Arowana is a large ornamental fish, and it is also an ancient primitive fish species. It is native to Southeast Asia. It is very rare in the wild, but there are many in captivity. As a tropical fish, it has certain requirements for water temperature, and it is best to keep it above 24°C. In addition, during the breeding season, male fish will hold the eggs in their mouths to protect them.

3. Guppy Guppy is a very common small tropical fish. It has many types and rich colors. No matter which one, it has a beautiful big tail. It is worth mentioning that guppies are very easy to keep as ornamental fish. They have strong adaptability to the environment and are easy to reproduce. They are especially suitable for beginners to practice.

4. Parrot fish Parrot fish is an artificially bred ornamental fish and is currently quite popular, mainly because of its bright red color, so it is very popular in China. Due to the congenital defects of this fish, it has a relatively high demand for oxygen and requires high dissolved oxygen to survive. In addition, attention must be paid to feeding and water temperature to keep its body color bright.

5. Koi Koi, like goldfish, is a wide-temperature fish, but it is relatively large and requires a larger fish tank to keep it. However, it does not have high requirements for water quality, and its food habits are relatively complex, so it is still very easy to raise.