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RiversEl Niño seen disrupting fish migration patternsSpeciesScientists 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-NicolaRiversEl Niño seen disrupting fish migration patternsSpeciesScientists 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-Nicola
EveryFish

Least concern

Widespread and not thought to be at risk. 286 fish on EveryFish so far.

Least Concern is the IUCN Red List category for species that have been assessed and are not close to qualifying as threatened. They are usually widespread and abundant. Many important food fish are in this category, including hilsa, rohu, skipjack tuna and Atlantic herring. Least Concern describes a species as a whole, worldwide; it does not mean that every local stock is healthy or well managed.

Common, not always safe

A fish can be Least Concern globally while particular populations are in trouble. Hilsa is widespread across the Bay of Bengal and its rivers, but its runs up the Ganges collapsed after the Farakka Barrage. Rohu and catla are abundant because they are farmed in huge numbers, while wild river stocks have declined. Herring stocks have crashed and recovered in different seas over the past century. Fisheries are managed stock by stock, so local assessments matter as much as the global category.

Back from the brink

Some fish have moved into Least Concern after recovering. The Atlantic bluefin tuna was listed as Endangered in 2011 after decades of overfishing; strict quotas set by the Atlantic tuna commission, ICCAT, and better enforcement let stocks recover, and in 2021 it was reassessed as Least Concern. Yellowfin tuna was moved from Near Threatened to Least Concern in the same update, though scientists warn that yellowfin in the Indian Ocean is still overfished.

Famous least concern fish

IlishLeast Concern globally, though local runs have fallenRohuAbundant thanks to farmingCatlaWidespread in farms and riversIndian mackerelA common schooling fish of the Indo-PacificSkipjack tunaThe most caught tunaAtlantic bluefin tunaMoved from Endangered to Least Concern in 2021Yellowfin tunaMoved to Least Concern in 2021Atlantic herringWidespread in the North Atlantic

Further reading

GroupSharkRayCarpCatfishSalmonidHerringCodTunaPerch-likeCichlidReef fishEelFlatfishLivebearerAncientOther
WaterRivers and lakesEstuaries and mangrovesCoasts and shelvesCoral reefsOpen oceanDeep seaPolar and cold seasCaves and springsBetween sea and river
UseFood fishFarmedAquarium fishSport fishingCulture and faithVenomous or dangerousInvasiveScience and research
OrderBest knownA to ZOldest firstNewest firstBy size
🇨🇦 Canada and 1 moreArctic grayling A cold-water salmon relative with a large, colourful dorsal fin.Salmonid · Rivers and lakes · 1776 🇿🇦 South Africa and 4 moreSmallmouth yellowfish A hardy sport fish native to South Africa's Orange-Vaal river system.Carp · Rivers and lakes 🇹🇷 Turkey and 4 moreAnchovy Small, oily forage fish found in oceans and some rivers worldwide.Herring · Coasts and shelves 🇩🇪 Germany and 4 moreEuropean smelt Small coastal fish with a cucumber scentOther · Rivers and lakes North AmericaAtlantic croaker Noisy marine fish of the western Atlantic coastOther · Coasts and shelves EuropeEuropean flounder A right-eyed flatfish found in European coastal waters and rivers.Flatfish · 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 🇺🇸 United States and 2 moreChannel catfish A widespread North American freshwater catfish, prized for food and sport.Catfish · Rivers and lakes · 1819 🇷🇺 Russia and 4 moreNorthern pike A large freshwater ambush predator found across the Northern Hemisphere.Other · Rivers and lakes · 1758 🇺🇸 United StatesCoastal cutthroat trout A Pacific trout with red throat marksSalmonid · Rivers and lakes 🇳🇿 New Zealand and 1 moreSprat Small forage fish of the genus Sprattus and related genera in the herring family.Herring · Coasts and shelves WorldZander A large freshwater predator fish native to Eurasia, valued for food and sport.Perch-like · Rivers and lakes · 1758 🇳🇴 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 🇧🇩 Bangladesh and 4 moreIlish Anadromous herring species prized as a delicacy in South Asia and the Middle East.Herring · Rivers and lakes 🇨🇳 China and 4 moreBighead carp A large Asian freshwater fish farmed globally and invasive in North America.Carp · Rivers and lakes 🇹🇭 Thailand and 3 moreSnakeskin gourami A large Southeast Asian freshwater fish known for its striped pattern and air-breathing ability.Other · Rivers and lakes 🇮🇩 Indonesia and 4 moreGiant gourami A large freshwater fish from Southeast Asia valued for food and kept in aquaria.Other · Rivers and lakes 🇮🇳 India and 4 moreGiant mudskipper Large amphibious goby found in Indo-Pacific mangroves.Other · Rivers and lakes 🇬🇧 United Kingdom and 4 moreCrucian carp A European cyprinid known for surviving winter ice by converting lactate to ethanol.Carp · Rivers and lakes 🇺🇸 United States and 1 moreStriped bass Anadromous marine fish native to the Atlantic coast of North America, known for sport fishing and culinary use.Other · Rivers and lakes 🇦🇺 Australia and 4 moreBarramundi A catadromous fish found across the Indo-West Pacific, valued for sport and aquaculture.Other · Rivers and lakes 🇺🇸 United States and 1 moreAlligator gar A large, primitive freshwater fish native to North America known for its armored scales and air-breathing ability.Other · Rivers and lakes · 1803 🇨🇩 Democratic Republic of the CongoGoliath tigerfish A massive freshwater predator from the Congo River Basin known for its size and sharp teeth.Other · Rivers and lakes · 1898 WorldCatfish A diverse order of ray-finned fish known for whisker-like barbels and lack of scales.Catfish · Rivers and lakes 🇨🇦 Canada and 1 moreWalleye A freshwater perch native to North America, prized for its pale eyes and firm white flesh.Perch-like · Rivers and lakes · 1818 🇦🇺 Australia and 2 moreCommon carp A widespread freshwater fish native to Europe and Asia, now farmed globally and often invasive.Carp · 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 🇨🇳 China and 4 moreNorthern snakehead A freshwater fish from East Asia known for its air-breathing ability and invasive spread in North America.Other · Rivers and lakes · 1842
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Every Monday: the fish of the day, new pages on EveryFish, and the conferences and anniversaries of the week ahead.