Freshwater fish live in inland waters such as rivers, streams, lakes, and ponds. Examples include bass, perch, bluegill, catfish, trout, and carp, as well as aquarium-associated fish such as bettas, guppies, and goldfish. “Freshwater” describes habitat, not aquarium suitability: each species has its own needs, and some fish migrate between fresh and salt water.
What counts as freshwater?
Freshwater fish inhabit inland waters, including rivers, streams, lakes, and ponds. Conditions and fish communities vary from place to place: NOAA, for example, describes trout in highland streams and catfish near the bottom of slower waters.
Not every freshwater-associated fish stays in freshwater for its whole life. NOAA describes salmon and sturgeon that begin life in freshwater, grow in the ocean, and return to freshwater to spawn.
Examples of freshwater fish
These examples illustrate the variety of fish associated with freshwater habitats. They are not an exhaustive list, and inclusion here does not mean a fish is suitable for a home aquarium.
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River and stream fish
- Trout—A familiar example associated with highland streams, according to NOAA.
- Catfish—NOAA notes that catfish may be found near the bottom of slower waters.
- Bass—A familiar freshwater fish named by NOAA in its river habitat discussion.
- Perch—Another example NOAA names in its discussion of river habitats.
- Bluegill—A freshwater fish NOAA includes among its examples.
- Salmon—Some salmon begin life in freshwater, grow in the ocean, and return to freshwater to spawn.
Lake and pond fish
- Largemouth bass (Micropterus salmoides)—FishBase reports it from lakes, ponds, swamps, creeks, and rivers.
- Common carp (Cyprinus carpio)—USGS reports it from lakes, ponds, and lower sections of rivers.
- Goldfish (Carassius auratus)—A freshwater fish also kept in aquariums.
- Guppy (Poecilia reticulata)—A freshwater fish often associated with home aquariums.
- Betta (Betta splendens)—A freshwater fish kept in aquariums.
FishBase reported 36,535 fish species in its February 2026 statistics. That is the database’s total for fish species, not a count of freshwater species.
Freshwater fish for home aquariums
Bettas, guppies, and goldfish are examples of freshwater fish kept in home aquariums. A freshwater habitat label alone does not establish whether a fish is appropriate for a particular aquarium or compatible with other fish. Research the species’ setup, food, care, and environmental needs before choosing it.
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CDC advises asking a veterinarian about proper aquarium setup, fish selection, food, care, and environmental requirements. Compatibility matters too: CDC notes that male bettas may fight if kept together. Do not assume that fish sold as aquarium species can share a tank or that one care setup fits every species.
Freshwater fish and their habitats
Freshwater habitats support a wide range of fish and other life. The Food and Agriculture Organization (FAO) says freshwater ecosystems cover about 1 percent of Earth’s surface and provide habitat for over 40 percent (13,000) of the world’s freshwater fish species.
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Fish communities differ among habitats, and some species use both freshwater and saltwater during their life cycle. Examples such as salmon and sturgeon show why it is important not to describe every freshwater-associated fish as confined to freshwater.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
What are some freshwater fish?
Examples include bass, perch, bluegill, catfish, trout, carp, bettas, guppies, and goldfish. The list is illustrative, not exhaustive.
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- THE MOST CONVENIENT CANISTER FILTER ON THE MARKET – The BioMaster's innovative EasyClean pre-filter module can be removed separately from the rest of the filter. This makes maintenance fast and simple. It also increases filter efficiency and extends the life of main filter foams.
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Which freshwater fish can live in an aquarium?
Bettas, guppies, and goldfish are examples of freshwater fish kept in aquariums. Whether a species is right for a specific aquarium depends on its setup, care, environmental needs, and compatibility. Ask a veterinarian for guidance.
Do all freshwater fish stay in freshwater?
No. Some fish move between freshwater and saltwater as part of their life cycle. NOAA describes salmon and sturgeon that begin life in freshwater, grow in the ocean, and return to freshwater to spawn.
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- THE MOST CONVENIENT CANISTER FILTER ON THE MARKET – The BioMaster's innovative EasyClean pre-filter module can be removed separately from the rest of the filter. This makes maintenance fast and simple. It also increases filter efficiency and extends the life of main filter foams.
- BUILT-IN HEATER – Integrated heater minimizes in-tank equipment, while also protecting inhabitants from direct contact. Temperature controlled via bi-metal technology with a thermal shutoff for safety.
- NO-MESS MAINTENANCE – Designed with safety locks on the handle, pre-filter, and aquastop to avoid spills during maintenance. The aquastop is detachable for easy movement of the filter without affecting the tubing setup.
- RELIABLE & BACKED BY WARRANTY – Made in Italy, with German engineering from OASE and backed by a 4-year warranty (3 + 1 year with online registration). Includes all the necessary fittings for your setup: curved inlet and outlet tubes, inlet strainer, water outlet nozzle, modular spray bar with flow control attachment, tubing, heater, heater adapter, and 6 ft. power cords (one cord for filter, one cord for heater).
How many freshwater fish species are there?
The supplied FishBase statistics report 36,535 fish species as of February 2026, but this is a total for fish species in the database, not a freshwater-only count. FAO reports that freshwater ecosystems provide habitat for over 40 percent (13,000) of the world’s freshwater fish species.
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