There are many popular types of pet fish, however, not all of these fish make good aquarium pets. If you are thinking about getting a fish for your freshwater or saltwater fish tank you might want to read our article first so that you will know exactly what to look for when buying your pet fish.

1. Goldfish

The goldfish is a popular pet fish. It is also known as Carassius auratus, or the common goldfish. It is one of the earliest domesticated animals and has been kept as a pet for centuries.

The goldfish gets its name from the color of its scales. The colors range from pale orange to bright orange and even red. The body is flat and oval shaped with short fins that protrude from the sides of its body. Its tail fin is long and flowing, which makes it an excellent swimmer in both freshwater and saltwater environments.

The goldfish can grow to be quite large if they are not cared for properly. However, most pet stores sell smaller versions that typically grow to be six inches long at most—though they can grow much larger under optimal conditions (e.g., no predators or other forms of stress).

2. Aquatic Catfish

Aquatic catfish is a popular type of pet fish. With their unique features, aquatic catfish can be a great addition to your aquarium. They are also relatively easy to care for and relatively inexpensive.

The most popular types of aquatic catfish are Corydoras species. These fish come in many colors and many sizes. Some species grow up to four inches long, while others only reach an inch or so in length when fully grown.

These fish are native to South America and can thrive in both fresh and saltwater environments. However, it is best to keep them in freshwater tanks because they will not tolerate poor water quality as well as other types of fish.

Many people who have kept aquatic catfish report that these fish tend not to eat much at all unless there is something on the menu that they can't resist (such as bloodworms). If you do feed your aquatic catfish bloodworms or other types of live food, make sure that you remove any leftover food from your tank right away so that your tank mates don't get sick from eating it later on down the road when it starts to decay in their stomachs!

3. Angelfish

Angelfish is a popular type of pet fish. They are found in the wild in many parts of the world and come in many colors and shapes. Angelfish is a type of cichlid, which means they are a family of fish that eat other fish, plants, and algae.

Some types of angelfish are more colorful than others. Some have bright orange or red scales while others have blue or green scales with stripes or spots on them. Additionally, Angelfish can live for up to 20 years if they are cared for properly.

Angelfish make good pets because they are easy to take care of and they don't cost much money to buy or keep alive. They like to swim around in tanks with lots of decorations and plants so they can hide from predators when they're not feeding or sleeping at night (which happens often).

4. Paradise Fish

Paradise fish (Macropodus opercularis) is a species of freshwater tropical fish belonging to the family Cyprinidae. It is native to Southeast Asia and found in Thailand, Laos, Cambodia and Vietnam. The paradise fish is also a popular aquarium fish for home aquarists because it is beautiful, hardy and easy to care for.

Paradise fish has an average lifespan of 3 years but can live up to 8 years if well cared for. The coloration of this fish depends on its habitat, those that live in clear water are usually more colorful than those living in murky waters. It has a torpedo shaped body with a big head and eyes that can grow up to 3 inches (7.6 cm). The fins are large and may be yellow or orange in color depending on the type of paradise fish you have acquired. Males have larger fins than females which makes them more attractive to other species during spawning time.

They are one of the popular types of fish because they aren't very expensive to purchase or maintain, so you won't have to worry about breaking the bank every time you want to add another one to your collection. They're also inexpensive if you choose to buy them as fry at a local pet store or online retailer like Amazon or Walmart rather than ordering them directly from an online breeder or supplier.

5. Koi Fish

Koi fish have been kept as pets since ancient times. The Japanese word “koi” actually means “carp,” but it can also mean “orange-colored.” The koi fish was originally bred for food and used for fighting matches. But due to their vibrant coloration and peaceful nature, they are now more commonly kept as pets.

The reason why people kept them as pets is because Koi are very hardy. They can survive in a wide range of temperatures, environments, and water conditions. Koi owners often keep their fish outside in ponds or tanks that have natural water flow and filtration systems. Koi do best when they have plenty of room to swim around and explore their environment, so be sure that your tank has enough space for your new pet!

Koi can also grow very large, some species can reach up to 6 feet long! If you want a smaller fish, consider choosing goldfish instead. Goldfish only grow up to around 12 to 15 inches long on average, although there are some varieties that reach as long as 34 to 36 inches or more!

6. Tetra Fish (Danios or Dwarf Gourami)

Tetra fish are generally inexpensive and easy to care for. The most common types of tetra fish are Danios (also called Dwarf Gourami) and Cardinal Tetras.

Danios are small, slender, colorful fish. They come in many colors including red, orange, blue and black with gold or silver highlights. They have long bodies that taper to a point at the tail fin, giving them an arrow-shaped appearance when viewed from above or below. Danios range in size from 2 inches to 6 inches long depending on their species and can live up to 5 years in captivity if properly cared for.

Cardinal tetras have a red stripe down the middle of their bodies and can grow up to 4 inches long. These fish are peaceful by nature but will sometimes fight with each other when kept together in large numbers or if kept with too many other species of fish in the same tank.

7. Betta Fish (Siamese Fighting Fish)

Betta Fish is a freshwater fish that comes in many different colors and patterns. The Betta fish gets its name from the Siamese fighting fish, which is a type of Betta fish.

The Betta fish can be kept in aquariums or bowls, but it is best if you keep them in a large aquarium with water that has been treated with aquarium salt. A heater can also be used to keep the water at an ideal temperature for your Betta fish.

The tank should have a lid so that your Betta fish cannot jump out when they become scared by something such as a loud noise or sudden movement near their tank. You also need to make sure there are no sharp objects near your tank because these could hurt your Betta fish if they were to jump out while frightened by something such as loud noises or sudden movements near their tank. On top of that, Bettas are one of the easiest types of pet fish to care for because they require minimal maintenance and effort on your part. They do not need to eat much, so you will not have to feed them much either!

There are also many places where you can go online or in person to find Betta fish for sale at affordable prices or even free if you want some extra company while doing chores around the house!

And of course the best part is that Bettas come in all sorts of colors and patterns which makes them quite beautiful creatures indeed! If you like colorful things then this might be something that interests you!

8. Killifish (Nothobranchius Killifish)

Killifish is a small freshwater fish that originates from Africa. The killifish can be kept in aquariums but you should take note that they are very sensitive to water changes and must be kept in a tank with low lighting conditions.

The killifish is easy to care for as long as you make sure that the water parameters remain stable. They also do not require any special foods or supplements so you only have to feed them with flake or pellet food once every day or two days depending on their size.

The killifish belongs to the family Nothobranchius and they are commonly referred to as African Dwarf Killifish because of their small size (usually less than 2 inches). When kept in an aquarium, these fish will grow up to around 1 inch in length. In the wild, however, they can reach up to 6 inches long.

These tiny freshwater fish are very popular among aquarium enthusiasts but it is also important to note that some species may not be suitable for beginners since they require specific environments that must be maintained at all times (such as temperature).

Do you have a passion for different types of fish? If so, you're not alone! Fish have always been popular pets, and their popularity is increasing. If you love to enjoy the many different fish varieties, we encourage you to consider one of these top eight options. They will definitely brighten up your aquarium!

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