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Introduction to Freshwater Fish for Home Aquarium

Freshwater fish are a popular choice for home aquariums because they are easy to care for and come in a variety of colors and sizes. Before choosing a fish, it is important to research their needs and compatibility with other fish in the aquarium. Here are some popular freshwater fish options for home aquariums:


A guppy is a little fish that enjoys living in lakes and ponds. The guppies have lots of space to swim around and play in the clean water of the pond or lake.

Guppies are a species of fish in the Perciformes (perch-like) family. They are little, vivid fish only found in Southeast Asian streams and rivers. They are aquatic invertebrates that inhabit slow-moving water and eat worms, insects, and aquatic plants. The females carry the eggs on their bellies and lie in tiny depressions on the riverbed. The male fertilises these eggs. The species’ reproductive cycle readily allows it to regulate itself through breeding. Guppies were introduced to new areas, which led to a decline in native species and an increase in invasive species.

Typical Name: Guppy

Poecilia reticulata, the scientific name

Adult Dimensions: 2 inches (5 centimetres)

Expected lifespan: 3 to 5 years

Mickey Mouse Platy

Disney Mickey A wrasse fish species called a platyfish is a platyfish. The eastern Pacific Ocean has platyfish, which can be found from southern California north to Washington, British Columbia, and south to Mexico. This fish typically measures 5 to 14 centimetres (2 to 6 inches) in length and weighs between 1 and 3 kg (2.2-6.6 pounds). It primarily eats crustaceans. It is a fish with a solid territorial feeling and is exceptionally social. They reside in informal communities or institutions. The fish are simple to maintain in an aquarium.

Common Names: Moonfish, Mickey Mouse Platypus, Golden Moon Platypus

Named after a plant: Xiphophorus maculates

Adult Size: 3 1/2 to 5 centimetres (1 1/2 to 2 inches).

5-year life expectancy

Zebra danio (Zebrafish)

Zebrafish are a popular breed of fish among aquarists (Danio rerio). This fish is tiny (approximately an inch long) and typically has black and silver stripes. It is a vibrant, energetic fish. Because it requires less maintenance, beginners frequently choose it. Zebrafish can survive in any climate. They may be kept in tanks as small as 3 gallons and only need a little food. They don’t require a particular diet. Like any fish, they enjoy eating flakes of food.

Common Names: Zebra danio, zebrafish, and striped danio

Named after a fish, Danio rerio

Adult Dimensions: 2 inches (5 centimetres)

5-year life expectancy

Neon Tetra

Neon tetras are vibrant, attractive fish that are simple to keep in aquariums. They swim quickly, have vivid blue-green colours, and excel at eating brine shrimp and other tiny foods. The neon tetra is very distinct from catfish, although having a similar appearance. The tail of a catfish is broad and triangular, whereas the tail of a neon tetra is more thin and pointed. Neon tetra also has a very different colour pattern than catfish. Because of its electrifying shock, the neon tetra is also known as the “Electric Catfish.”

In the late 1970s, they were initially seen in South Africa. They can be found in rivers, lakes, ponds, canals, and even swimming pools because they are native to a warm, tropical oceanic location. Tetras are commonly kept as aquarium fish.

The omnivorous neon tetra consumes both plants and insects. Snails and other little invertebrates are what they consume.

Common names include neon fish and neon tetra.

Paracheirodon innesi is its scientific name.

Size for Adults: 1 1/2 inches (4 centimetres)

5-year life expectancy

White Cloud Mountain Minnow

The white cloud mountain minnow fish is an uncommon kind of fish that inhabits high elevations and is extremely small in size. Since it lacks teeth, it primarily eats plants, like grasses and vegetables. Its soft fins prevent it from swimming, allowing it to survive in nutrient-poor water. The creature’s body is coated by unique skin with excellent heat retention.

The most popular and widely distributed of our products is White Cloud Mountain Minnow fish. The strongest and most adept at adjusting to the conditions of its surroundings, this variety of minnows can also adapt to many aquatic settings. It has a size range of 1-2 inches and is appropriate for freshwater ponds and lakes.

Tanichthys albonubes is its scientific name.

Size for Adults: 1 1/2 inches (4 centimetres)

Expected lifespan: 3 to 5 years

Harlequin Rasbora

The Harlequin Rasbora is a stunning, vivid fish that resembles a little angelfish. The male’s dorsal fin is large and thin, reaching past the tail. The female’s dorsal fin is shorter and frequently dark crimson in colour. On their sides, both sexes have broad, vivid yellow markings. The U.S., Canada, and Mexico are indigenous to freshwater rivers, creeks, streams, ponds, and canals. They typically inhabit locations with a lot of greenery and plants and appreciate clean water. Rasbora fish is a portion of great food and, when given the proper care and attention, will grow swiftly.

One of the world’s most vibrant fish is the harlequin rasbora. They feature vivid orange-yellow fins on long, lean bodies. Males are significantly more colourful than females. The male will move to the female’s back and press his dorsal fin against her body when they begin to mate. This aids in egg fertilisation. The female will release a mass of eggs used for fertilisation. Typically found in schools, Harlequin Rasboras reside there and eat small benthic invertebrates. They also consume zooplankton, algae, debris, and tiny crustaceans. The harlequin rasbora inhabits freshwater, muddy or sandy substrates, and shallow seas near coral reefs.

Common Names: Red rasbora and harlequin rasbora

Trigon stigma heteromorphy is the formal name.

Adult Size: 4 1/2 cm (1 3/4 inches)

6-year life expectancy

Serpae Tetra

Bluefish with green and yellow dots are called serape tetra fish. They are housed in what is known as a shoal. They are energetic and consume a lot of plankton while young. However, as they age, they become less active and consume less food. They start consuming vegetation and are living longer. When adults die, they release their eggs, which hatch into young fish that begin life as plankton feeders.

A little fish with a yellow body, green fins, and an orange stripe extending from the top of its nose to the end of its tail is known as a Serape tetra fish. They can be found in coastal waterways, rivers, lakes, and ponds in temperate to tropical areas.

Fish are found in around 4,000 different species worldwide. Their size, shape, colour, diet, and habitat are all variable. They go through several stages in their lives. Their life history is complicated. Fish are amazing animals. Here is a list of some of the most popular fish species found worldwide:

The genus Hyphessobrycon eques

Adult Size: 4 1/2 cm (1 3/4 inches)

5-year life expectancy

Panda Corydoras

A tropical and semiaquatic species of freshwater fish, the giant freshwater catfish of Asia and Africa can reach weights of up to 100 lbs. They are distinguished by their vivid hues and frequently patterned skin, which can be any combination of red, orange, black, brown, white, yellow, purple, green, blue, or pink. There are many other hue combinations, but gold with blue and black specks is the most typical.

Corridors are omnivorous and can survive in water with little to no oxygen. They were first discovered in Venezuela in 1985 but have since spread worldwide. Although they are being raised in ponds and tanks in the US and other countries, they are found in the wild in tropical freshwater rivers and wetlands. They are omnivores that eat plants, algae, insects, and other small creatures; thus, they don’t need a lot of nutrients in their diet. They can adapt well to human care since they can eat nearly any available food.

These corridor species are traded in aquariums and can be found in the rivers of the Southeast Asian region. In 1938, J.H. Patterson and C.G. Darwin made the discovery.

A particular variety of Corridor’s Rivers in Argentina and Paraguay are home to fish, which live there for ten years before dying. They are only one inch long and can survive up to eight days without oxygen. They typically have black skin, vivid red fins, and a white belly. Because of its adorable appearance, this fish is known as the “Panda Fish.”

Common names include panda cory, panda corydoras, and panda catfish.

Corydoras panda is its formal name.

Adult Dimensions: 2 inches (5 centimetres)

10-year life expectancy

Glowlight Tetra

The glowlight tetra fish can be housed in a small aquarium with water resembling its natural environment, which is in tropical waters beneath a coral reef. It is a remarkable, calm, and quiet fish. Although it doesn’t eat, it will accept food flakes and other little pieces.

The first glow fish in recorded history to be present everywhere underwater. The bioluminescent organism with the most significant global distribution is the tetra fish. Given that its body is separated into four pieces, its name signifies “four.” This fish uses a unique chemical process to create a glow that appears light and lasts for two to three seconds. To draw in prey, this fish is employed. The fish also has a giant brain. Of all fish, it has the largest brain. This fish is a remarkable creature.

After goldfish and guppy, the Tetra Tetra aquarium fish is kept the most frequently worldwide. Melanotaenia fluviatilis is its scientific name, and it is indigenous to Indonesia, which means “black-backed river shark,” this name. Although it is a small, calm fish, the tetra Tetraccasionally be aggressive toward larger fish. They frequently dive into the water in pursuit of food. The life cycle of this fish is remarkable. The male Tetras will hatch from a tiny transparent egg case and appear as little white specks floating in the tank’s water. The baby fish that emerge from these small eggs are dark grey and develop into adults.

Common Names: Fire neon, glowlight, and glowlight tetra

Hemigrammus erythrozonus is its scientific name.

Size for Adults: 1 1/2 inches (4 centimetres)

5-year life expectancy

Pea Puffer

Fish known as “puffers” can expand and take on the appearance of a giant puffer fish. This is employed to capture tiny games. The “Pufferfish,” on the other hand, uses it to inflate itself and flee from the larger fish. The “sea dragon” is another name for it.

With a length of more than 8 inches, the pea puffer is one of the biggest freshwater fish in the world. They are found globally in tropical waters. These fish are delicious to eat. They cook quickly, are simple to prepare, and taste great. They can be frozen in Asian shops or fresh from neighbourhood grocery stores.

Common Names: Pygmy Puffer, Pea Puffer, Dwarf Puffer, Bumblebee Puffer

Carinotetraodon travancoricus, scientific name

Size for Adults: 1 to 1 1/2 inches (3-4 centimetres)

4-year life expectancy

Tiger Barb

Barbonymus saltator, a tropical freshwater fish of the Cyprinidae family, is sometimes known as the “tiger barb fish.” It is frequently referred to as the saltwater barb and was first described by Carl Linnaeus in 1758. It is an invasive species in the United States and has been imported to other regions, including much of the Amazon basin, where it is native. Although it is a common aquarium fish, it thrives when given a small amount of salty water exposure, especially in tropical settings.

Common names include part belt barb, Sumatra barb, and tiger barb.

Barbus tetrazona is its scientific name.

Adult Dimensions: 3 inches (7 centimeters)

6-year life expectancy

German blue ram

Freshwater fish native to South America include the blue ram fish. Though it resembles a carp, it is a kind of catfish. Indigenous tribes, notably the Inca and the Aztecs, have long utilized it as an aphrodisiac.

German blue ram fish have long been regarded as an invasive species with the potential to quickly colonize huge areas, devastate ecosystems, and outcompete native species. In reality, they have already occupied more than 200 lakes and streams around the state, driving out native fish species and degrading the environment.

Ram Chiclid, German Blue Ram, and other familiar names

Microgeophagus Ramirez is its scientific name.

Adult Dimensions: 2-3 inches (5-7 centimeters)

Buenos Aires Tetra

For kids’ first aquarium, Buenos Aires Tetra fish are ideal. It looks appealing, needs little upkeep, and is simple to maintain. Due to its low maintenance needs, capacity to live in a wide range of water conditions, and simplicity of breeding, this tetra fish is well-liked.

The Buenos Aires tetra fish is a kind of fish that can live solely off of the water for months at a time. Instead of swimming using their fins, these fish move ahead by gliding over the water while waving their tail. They are among the fish that swim the quickest in the world. Additionally, they have broad mouths with long rows of pointed teeth.

Freshwater fish with blue-green scales, called Buenos Aires Tetra Fish, are indigenous to Argentina and Uruguay. It can get as long as 6 inches. The fish’s vivid colors and resilience make it popular in aquariums.

Common Names: Red cross fish, diamond spot characin, Buenos Aires tetra

Hyphessobrycon anisitsi is its scientific name.

Size for Adults: 2 3/4 inches (7 centimeters)

5-year life expectancy

Dwarf Gourami

The tiniest betta fish species is the dwarf gourami. The dwarf gourami fish has a small body and can reach a maximum length of 12 cm. They typically are active both during the day and at night. They can develop to an incredible size, measuring 100 centimeters in length. They may reproduce in captivity, and their gestation period is roughly 5 weeks.

Dwarf gourami fish are small enough to fit in practically any aquarium and grow extremely quickly. The dwarf gourami is not a goldfish or guppy; it is a proper aquarium fish. These tiny creatures are excellent for newcomers. They are more adaptable to smaller aquariums than other fish and have gem-like colors that make them appear.

Dwarf gourami, flame gourami, powder blue gourami, red gourami, and sunset gourami are some of their common names.

Trichogaster Ialius is its scientific name.

Adult Dimensions: 2 inches (5 centimeters)

4-year life expectancy

Chinese Gold Barb

What makes a Chinese barb fish golden? Just look at this gorgeous creature! The origin of Chinese barb fish is actually from Japan, which is the first thing to know. This is a rare pet fish that is exclusive to this region of the planet. They are well-known fish. People mistakenly believe that gold barbs and Chinese barb fish are the same. They are different animals, as you will discover if you compare them to one another. Chinese barb fish are smaller than gold barb in size. They can reach lengths of up to 10 cm. However, gold barbs can get a height of 4 m. The mouth of Chinese barbs is also relatively small. They hardly have enough room in their mouth. It is considerably smaller than gold barbs in comparison. The Chinese barb fish head is comparable to the gold barbs in shape. On the other hand, the gold barbs have a long head and a wide, circular mouth. Their bodies are both golden in tone.

Common Names: Schubert’s barb, China barb, Chinese barb, Chinese half-stripes barb, gold barb, green barb, half banded barb, half-stripes barb

Puntius semifasciolatus is its scientific name.

Adult Size: 7 1/2 cm (3 inches)

5-year life expectancy

Toby Fish

Betta fish are a lot of fun and very active. They are a favorite among homeowners and aquarists alike. Betta fish are brilliant and quick learners. They are simple to train to perform tricks and navigate a tank. Foods like flakes, blood worms, and mosquito larvae are favorites of theirs. They do best in a tank with a sand substrate and lots of hiding spots. They require little maintenance.

The vibrant tropical fish known as betta fish are indigenous to South Asia. Numerous pet stores and online retailers sell them. Large aquariums with plenty of water are necessary for these fish. The hues of betta fish span from black to blue to green to yellow to red to orange to pink to purple. They are also renowned for being resilient fish that can survive in various climates.

Common names: Siamese fighting fish and Betta

Betta splendens, scientific name

Adult Size: 7 1/2 cm (3 inches)

Approximately two to three years.



Fish like the HachetFish are a threatened species. They can be found in the Amazon River basin’s freshwater areas. There are only about 200,000 left in Brazil. They first appeared in writing in 1891. They are now infrequent. The entire population is at risk since it is so rare. It is rare to encounter wild hatchet fish. Most of them are tank dwellers. Because of this, it is crucial to safeguard these tiny fish.

Hatchetfish with a marbled appearance

Carnegiella strigata is its scientific name.

Adult Dimensions: 1-2 inches (3-5 centimeters)

5-year life expectancy