The Ultimate Freshwater Fish List

Wondering what types of fish are there beyond the handful you might recognize from a local river or an aquarium shop? This freshwater fish list organizes the world's roughly 18,900 recognized freshwater species into the major family groups that actually define them carp, catfish, cichlids, salmonids, ancient lineages, and more with real species examples in each, including several familiar from Pakistan's own rivers and fish farms.

Just How Many Freshwater Fish Are There?

Freshwater fish make up a genuinely enormous share of global fish diversity. According to the IUCN Freshwater Fish Specialist Group, there are currently 18,898 recognized freshwater fish species 51 percent of all known fish species and a full quarter of all known vertebrates on Earth, despite freshwater habitats covering only about 1 percent of the planet's surface. The list keeps growing, too: taxonomists described 309 new freshwater fish species in 2025 alone, the highest annual total since 2017, with new discoveries coming from limestone caves, peat swamps, and remote wetlands across five continents.

Carps & Minnows: The Biggest Freshwater Family

The family Cyprinidae carps and minnows is the single largest freshwater fish family, with more than 2,000 recognized species worldwide. This group includes the common carp, goldfish, koi, and a huge range of smaller minnow species used in freshwater ecosystems worldwide as both prey species and popular aquarium fish. It's also the backbone of Pakistan's aquaculture industry: catla, rohu, mrigal, grass carp, and silver carp the five species stocked together in Pakistan's traditional polyculture ponds all belong to this family, alongside the mahseer, a prized wild game fish found in the Indus River system.

Catfish: One of the Most Diverse Freshwater Orders

The order Siluriformes, commonly known as catfish, spans dozens of families and thousands of species, ranging from small aquarium species to some of the largest freshwater fish on Earth. The Mekong giant catfish, found in Southeast Asia, can grow to enormous sizes, while the channel catfish and blue catfish are widely fished and farmed across North America. Walking catfish, native to South and Southeast Asia, can survive out of water for extended periods and move short distances across land using their fins a trait that has also made them a successful invasive species in places like Florida's canal systems.

Cichlids: A Family Defined by Rapid Evolution

Cichlidae is one of the most species rich vertebrate families in the world, with more than 1,600 recognized species, most famously the hundreds of distinct cichlid species that evolved in Africa's Great Lakes over a relatively short evolutionary timescale. Tilapia, several species of which are farmed worldwide and have become invasive in warmer regions, belong to this family, as do popular aquarium species like the oscar and discus.

Salmonids: Cold Water Specialists

The family Salmonidae covers trout, salmon, and char cold water species that have shaped both major commercial fisheries and freshwater aquaculture worldwide. Rainbow trout, brown trout, and kamloop trout are all farmed in the cooler streams of northern Pakistan, including Chitral, Swat, and Gilgit Baltistan, while Pacific salmon species undertake some of the animal kingdom's most demanding migrations between ocean and freshwater river systems.

Perch, Bass & Sunfish: The Perciformes Freshwater Groups

Several families within the massive order Perciformes dominate freshwater sport fishing in North America and beyond. The sunfish family (Centrarchidae) includes largemouth bass, Florida bass recognized as its own distinct species in 2024 bluegill, and black crappie. The true perch family (Percidae) includes yellow perch and walleye, both popular North American sport and table fish.

Ancient Lineages: Gar, Bowfin, Lungfish & Sturgeon

Some freshwater fish families represent evolutionary lineages that have persisted with relatively little change for tens of millions of years. Gar, with their elongated, armored bodies, and bowfin, an air breathing predator sometimes called "mudfish," are both considered living examples of ancient fish body plans still found in North American rivers and lakes today. Lungfish, found in Africa, South America, and Australia, can breathe air directly and survive extended droughts by burrowing into mud. Sturgeon, among the largest and longest lived freshwater fish, include several species now under strict conservation protection due to overfishing and habitat loss.

Killifish & Small Freshwater Species

The order Cyprinodontiformes includes killifish, guppies, mollies, and swordtails small, often colorful species that dominate the freshwater aquarium trade worldwide. Some killifish species, like the mangrove rivulus, can survive out of water for weeks at a time by breathing through their skin, an adaptation that helps them survive in temporary or oxygen poor pools.

Comparing the Major Freshwater Fish Groups

FAQ

How many species of freshwater fish exist?

According to the IUCN Freshwater Fish Specialist Group, there are currently 18,898 recognized freshwater fish species, representing 51 percent of all known fish species worldwide.

What is the largest freshwater fish family?

Cyprinidae, the carp and minnow family, is the largest, with more than 2,000 recognized species worldwide.

Are new freshwater fish species still being discovered?

Yes. Taxonomists described 309 new freshwater fish species in 2025 alone, the highest annual total since 2017, found across five continents.

What freshwater fish families are important in Pakistan?

Cyprinidae is central to Pakistan's fisheries carp species like catla, rohu, and mrigal dominate aquaculture, while wild mahseer, also a cyprinid, is a prized game fish in the Indus River system. Salmonidae (trout) are farmed in the cooler streams of northern Pakistan.

What's the difference between cichlids and catfish?

Cichlids (family Cichlidae) are a single, extremely species rich family known for rapid evolutionary diversification, especially in African lakes, while catfish (order Siluriformes) span dozens of separate families with a huge range of body types and sizes.

What are some of the oldest freshwater fish lineages still alive today?

Gar, bowfin, lungfish, and sturgeon are all considered living examples of ancient fish lineages that have persisted with relatively little structural change for tens of millions of years.

Which freshwater fish family dominates the aquarium trade?

Cyprinodontiformes, which includes killifish, guppies, mollies, and swordtails, along with several cyprinid and cichlid species, supplies much of the global freshwater aquarium trade.

Conclusion

Nearly 19,000 recognized freshwater fish species sort neatly into a manageable set of major families once you know what to look for carp and catfish dominating by sheer species count, cichlids and killifish driving the aquarium trade, salmonids and sunfish anchoring cold  and warm water sport fishing, and ancient lineages like gar and lungfish offering a genuine window into fish evolution. Pakistan's own rivers and fish farms touch several of these groups directly, from Indus mahseer to farmed trout in the north. For a closer look at how these species get farmed and studied, see our guides on pisciculture and fish farming science or what fisheries science actually studies.