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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
🇺🇸 United States and 3 moreSockeye salmon Anadromous Pacific salmon known for red spawning colour and zooplankton diet.Salmonid · Rivers and lakes · 1792 🇺🇸 United States and 3 moreKokanee salmon A landlocked freshwater form of the sockeye salmon found in North America and Japan.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 🇺🇸 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 WorldBrown trout A widespread salmonid with river, lake and sea forms.Salmonid · Rivers and lakes · 1758 🇷🇺 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 🇳🇴 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

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.