News
SpeciesScientists Discover Mysterious New Fish in the Red Sea – and Have Never Seen It AgainOceanEye to eye with Britain's hidden sharks at SharkAdemy - OceanographicRiversIn October, biologists surveying a New York harbor for invasive fish pulled up a bright yellow one. It wasn't an invasive species at allOceanShedd Aquarium Sends Shark Eggs to Bolster Wild PopulationsSpeciesA rare fish has been found in Lake Ontario, North America, whose entire body is golden. It is a nati..OceanThe Great Sea Reef Is Fiji’s Wildest Dive, and a New Frontier for ConservationOceanEckerd College professor contributes to designating Biscayne Bay an Important Shark and Ray AreaSpeciesRio Verde Grande Survey Identifies Fifty-Three Fish Species Facing Flow ReductionsFisheriesAdams River Salmon Run in Thompson-NicolaIndiaHilsa production dropped 26% in five years, fisheries minister tells parliamentSpeciesScientists Discover Mysterious New Fish in the Red Sea – and Have Never Seen It AgainOceanEye to eye with Britain's hidden sharks at SharkAdemy - OceanographicRiversIn October, biologists surveying a New York harbor for invasive fish pulled up a bright yellow one. It wasn't an invasive species at allOceanShedd Aquarium Sends Shark Eggs to Bolster Wild PopulationsSpeciesA rare fish has been found in Lake Ontario, North America, whose entire body is golden. It is a nati..OceanThe Great Sea Reef Is Fiji’s Wildest Dive, and a New Frontier for ConservationOceanEckerd College professor contributes to designating Biscayne Bay an Important Shark and Ray AreaSpeciesRio Verde Grande Survey Identifies Fifty-Three Fish Species Facing Flow ReductionsFisheriesAdams River Salmon Run in Thompson-NicolaIndiaHilsa production dropped 26% in five years, fisheries minister tells parliament
EveryFish

Rivers and lakes

Fresh water: rivers, streams, lakes and ponds. 629 fish on EveryFish so far.

Rivers, lakes, streams and ponds hold less than one per cent of the Earth's water, yet about half of all known fish species live in them. Fresh water is broken into separate basins, and fish that cannot cross between them evolve apart, which is why each river system and lake has its own species. The Amazon, Congo, Mekong and Ganges basins and the great lakes of Africa are the richest.

Life in fresh water

A freshwater fish is saltier inside than the water around it, so it must pump salt in through its gills and pass a lot of dilute urine. Freshwater habitats range from torrential Himalayan streams, where loaches cling to rocks, to warm, still swamps where air-breathing snakeheads, catfish and gouramis thrive. Many river fish time their spawning to floods: the Indian major carps spawn in the monsoon floodwaters, and Mekong fish move into flooded forests.

The most threatened fish

Freshwater fish are declining faster than sea fish. A 2021 report by conservation groups found that about a third of freshwater fish species are threatened with extinction and that 80 had already been declared extinct. Dams block migrations, water is drawn off for farms and cities, pollution and sand mining degrade rivers, and introduced species such as tilapia and African catfish compete with native fish. In India, the rivers of the Western Ghats and the North-East hold many endemic fish at risk.

Famous rivers and lakes fish

RohuA river carp of the Indian subcontinentArapaimaAn air-breathing giant of the AmazonMekong giant catfishOne of the largest freshwater fishGolden mahseerThe golden mahseer of Himalayan riversNile perchA huge predator of African lakesRed-bellied piranhaA schooling fish of South American riversZebrafishA small fish of South Asian streams

Further reading

GroupSharkRayCarpCatfishSalmonidHerringCodTunaPerch-likeCichlidReef fishEelFlatfishLivebearerAncientOther
UseFood fishFarmedAquarium fishSport fishingCulture and faithVenomous or dangerousInvasiveScience and research
OrderBest knownA to ZOldest firstNewest firstBy size
🇹🇿 Tanzania and 2 moreSingida tilapia A cichlid fish native to the Lake Victoria basin in East Africa.Cichlid · Rivers and lakes 🇪🇬 Egypt and 4 moreNile tilapia A hardy cichlid farmed globally for food.Cichlid · Rivers and lakes · 1758 🇭🇳 Honduras and 3 moreJaguar cichlid Large predatory cichlid from Central American lakesCichlid · Rivers and lakes 🇧🇷 Brazil and 2 morePeacock bass Large predatory cichlids from South American rivers known for sport fishing and invasive impact.Cichlid · Rivers and lakes 🇧🇮 Burundi and 3 moreGiant cichlid The largest living cichlid species, native to Lake Tanganyika in Africa.Cichlid · Rivers and lakes · 1899 Karonga tilapia 🇲🇼 Malawi and 2 moreKaronga tilapia Endangered cichlid from Lake Malawi and the Shire River.Cichlid · Rivers and lakes WorldCichlid Diverse freshwater fish family known for parental care and rapid evolution.Cichlid · Rivers and lakes · 1835 🇨🇷 Costa Rica and 1 moreMidas cichlid Large aggressive cichlid from Central AmericaCichlid · Rivers and lakes 🇺🇸 United States and 1 moreTexas cichlid The only cichlid native to the United StatesCichlid · Rivers and lakes 🇲🇽 Mexico and 1 moreMayan cichlid A hardy cichlid from Mesoamerica with a distinctive tail spot.Cichlid · Rivers and lakes WorldUaru A large South American cichlid from clear Amazon streams.Cichlid · Rivers and lakes · 1840 Sub-Saharan AfricaJewel cichlid Brightly colored African cichlids kept in aquariums for their vivid breeding colours and parental care.Cichlid · Rivers and lakes WorldMango tilapia A large cichlid native to Africa and the Levant.Cichlid · Rivers and lakes 🇮🇱 Israel and 1 moreBlue tilapia Hardy cichlid native to Africa and the Middle EastCichlid · Rivers and lakes Middle EastRedbelly tilapia A hardy cichlid from Africa and the Middle East.Cichlid · Rivers and lakes 🇧🇷 Brazil and 3 moreOscar Large South American cichlid popular in aquariumsCichlid · Rivers and lakes · 1831 🇧🇷 Brazil and 3 moreSpeckled peacock bass A large South American cichlid prized for sport and food.Cichlid · Rivers and lakes 🇧🇷 Brazil and 1 moreButterfly peacock bass Large South American cichlid prized for sport fishingCichlid · Rivers and lakes Livingston's cichlid Sub-Saharan AfricaLivingston's cichlid A predatory cichlid from Lake Malawi that feigns death to hunt.Cichlid · Rivers and lakes Sub-Saharan AfricaRedbreast tilapia Herbivorous cichlid from southern African freshwatersCichlid · Rivers and lakes · 1897 Sub-Saharan AfricaVictoria tilapia A cichlid native to Lake Victoria with unique colour patterns.Cichlid · Rivers and lakes 🇿🇦 South Africa and 4 moreMozambique tilapia A hardy cichlid from southeastern Africa, now farmed globally and listed as a major invasive species.Cichlid · Rivers and lakes WorldTilapia Common name for nearly a hundred species of cichlid fish native to Africa and the Middle East.Cichlid · Rivers and lakes · 1840 🇮🇳 India and 1 moreGreen chromide A brackish water cichlid native to India and Sri Lanka.Cichlid · Rivers and lakes · 1790

Photo credits on this page

The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

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Every Monday: the fish of the day, new pages on EveryFish, and the conferences and anniversaries of the week ahead.