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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. 632 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
🇺🇸 United States and 3 moreSockeye salmon Anadromous Pacific salmon known for red spawning colour and zooplankton diet.Salmonid · Rivers and lakes · 1792 🇷🇺 Russia and 2 moreMasu salmon Pacific salmonid native to East Asian coasts and rivers.Salmonid · Rivers and lakes 🇺🇸 United StatesCutthroat trout A group of Pacific trout native to western North America, known for red throat markings.Salmonid · Rivers and lakes · 1793 🇺🇸 United StatesApache trout A golden-spotted trout native to Arizona highlands.Salmonid · Rivers and lakes WorldTaimen Large freshwater salmonids native to EurasiaSalmonid · Rivers and lakes 🇷🇺 Russia and 1 moreBaikal black grayling A Siberian freshwater salmonid found in Lake Baikal and surrounding river systems.Salmonid · Rivers and lakes 🇬🇧 United Kingdom and 1 moreFerox trout Large predatory trout native to deep glacial lakes in Britain and Ireland.Salmonid · Rivers and lakes · 1835 🇺🇸 United States and 3 moreKokanee salmon A landlocked freshwater form of the sockeye salmon found in North America and Japan.Salmonid · Rivers and lakes 🇧🇦 Bosnia and Herzegovina and 2 moreSoftmouth trout A rare salmonid native to Adriatic rivers in the Balkans.Salmonid · Rivers and lakes 🇬🇧 United Kingdom and 3 moreSea trout Anadromous form of brown trout that migrates between sea and rivers.Salmonid · Between sea and river 🇯🇵 JapanBiwa trout Salmonid fish endemic to Lake Biwa in JapanSalmonid · Rivers and lakes · 2025 🇹🇼 TaiwanFormosan landlocked salmon Endangered freshwater salmon endemic to Taiwan's high mountains.Salmonid · Rivers and lakes 🇺🇸 United States and 4 moreOncorhynchus A genus of migratory fish native to the North Pacific basin.Salmonid · Rivers and lakes 🇺🇸 United States and 1 moreBrook trout A colorful freshwater char native to eastern North America, known for its spotted pattern and status as a popular game fSalmonid · Rivers and lakes · 1814 🇺🇸 United States and 1 moreBull trout A large char native to cold rivers of northwestern North America.Salmonid · Rivers and lakes · 1836 🇨🇦 Canada and 1 moreLake trout Large freshwater char of northern lakesSalmonid · Rivers and lakes WorldBrown trout A widespread salmonid with river, lake and sea forms.Salmonid · Rivers and lakes · 1758 🇺🇸 United States and 3 moreDolly Varden trout A cold-water char native to the North Pacific rim.Salmonid · Rivers and lakes · 1792 🇺🇸 United StatesWestslope cutthroat trout Native salmonid of the upper Columbia and Missouri river basins.Salmonid · Rivers and lakes · 1856 🇺🇸 United StatesLahontan cutthroat trout Large native trout of the Lahontan Basin in Nevada and surrounding states.Salmonid · Rivers and lakes 🇺🇸 United StatesCalifornia golden trout Native high-elevation trout of the Sierra NevadaSalmonid · Rivers and lakes · 1892 🇮🇹 Italy and 4 moreMarble trout Adriatic freshwater salmonid with marbled skinSalmonid · Rivers and lakes 🇦🇹 Austria and 4 moreHuchen A large freshwater salmonid native to the Danube basin in Central and Eastern Europe.Salmonid · Rivers and lakes 🇷🇺 Russia and 3 moreSiberian taimen The world's largest salmonid, found in Eurasian rivers.Salmonid · Rivers and lakes 🇷🇺 Russia and 1 moreSakhalin taimen Large, ancient salmonid of Northeast AsiaSalmonid · Rivers and lakes 🇬🇧 United Kingdom and 2 moreGrayling A cold-water salmonid fish native to European rivers, prized by anglers for its distinctive dorsal fin.Salmonid · Rivers and lakes 🇺🇸 United StatesGila trout A copper-coloured salmonid native to the US Southwest.Salmonid · Rivers and lakes 🇨🇦 Canada and 1 moreArctic grayling A cold-water salmon relative with a large, colourful dorsal fin.Salmonid · Rivers and lakes · 1776 🇨🇦 Canada and 1 moreLake whitefish A cool-water freshwater fish from North America.Salmonid · Rivers and lakes 🇷🇺 Russia and 3 moreChum salmon A Pacific salmon species known for its large size and wide distribution across the North Pacific.Salmonid · Rivers and lakes · 1836 North AmericaRainbow trout A cold-water trout native to the Pacific basin with a distinctive red stripe.Salmonid · Rivers and lakes · 1792 🇳🇴 Norway and 4 moreAtlantic salmon A large anadromous fish found in the northern Atlantic Ocean and its rivers.Salmonid · Rivers and lakes · 1758 🇺🇸 United States and 3 moreChinook salmon The largest Pacific salmon species, prized for size and food value.Salmonid · Rivers and lakes 🇺🇸 United States and 2 moreSteelhead Anadromous form of the rainbow trout that migrates between ocean and freshwater.Salmonid · Between sea and river WorldArctic char Cold-water salmonid native to Arctic and alpine waters.Salmonid · Rivers and lakes · 1758 🇺🇸 United States and 3 moreCoho salmon Anadromous Pacific salmon known for silver ocean phase and red spawning colours.Salmonid · Rivers and lakes

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

The weekly digest

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