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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
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Small-scale fishing
🇺🇸 United StatesCisco Small salmonid fish of northern lakes and seasSalmonid · Rivers and lakes 🇲🇾 Malaysia and 1 moreHarlequin rasbora A small, colourful freshwater fish popular in home aquariums for its distinctive black body marking.Carp · Rivers and lakes 🇺🇸 United States and 1 moreCreek chubs Small North American minnows with a distinctive dorsal spotCarp · Rivers and lakes 🇲🇲 MyanmarOdessa barb Small colourful cyprinid from Myanmar popular in home aquariumsCarp · Rivers and lakes · 2008 🇮🇳 IndiaZebra loach A small, striped freshwater fish from India's Western Ghats, kept in aquariums and eaten locally.Other · Rivers and lakes · 1920 🇧🇷 Brazil and 3 moreBlue leopard corydoras Small peaceful armoured catfish from South AmericaCatfish · Rivers and lakes WorldWeather loach Small freshwater fish active before stormsOther · Rivers and lakes 🇬🇹 Guatemala and 4 moreConvict cichlid Striped Central American cichlid popular in home aquariumsCichlid · Rivers and lakes · 1867 Demasoni cichlid 🇹🇿 TanzaniaDemasoni cichlid Small striped cichlid from Lake MalawiCichlid · Rivers and lakes WorldAuratus cichlid Small, colourful cichlid from Lake MalawiCichlid · Rivers and lakes Sub-Saharan AfricaPrincess cichlid A cooperative schooling cichlid from Lake Tanganyika.Cichlid · Rivers and lakes WorldSix-line wrasse Small violet reef fish with six orange stripesReef fish · Coasts and shelves · 1857 WorldBluehead wrasse A small Atlantic reef fish known for changing sex and colour.Other · Coral reefs WorldGreen chromis Small iridescent reef damselfish found across the Indo-Pacific.Reef fish · Coral reefs WorldBluespotted cornetfish Long, slender reef fish with a tubular snout and blue spots.Reef fish · Coasts and shelves WorldOriental sweetlips Striped reef fish with swollen lips found in the Indo-Pacific.Other · Coasts and shelves · 1758 🇹🇭 Thailand and 2 morePearl gourami Small Southeast Asian fish with a pearly patternOther · Rivers and lakes · 1852 WorldSeahorse Small marine fish with horse-like heads and curled tails in the genus Hippocampus.Other · Coasts and shelves 🇻🇪 VenezuelaEndler's livebearer A small, colourful freshwater fish from Venezuela known for its bright patterns and ease of breeding in home aquariums.Livebearer · Rivers and lakes · 2005 Southeast AsiaBumblebee goby Small striped freshwater and brackish gobies from AsiaOther · Rivers and lakes 🇮🇩 IndonesiaRed rainbowfish A bright red freshwater fish from Lake Sentani, Indonesia.Other · Rivers and lakes · 1907 Turquoise killifish 🇿🇼 Zimbabwe and 1 moreTurquoise killifish Short-lived African fish used in ageing research.Livebearer · Rivers and lakes WorldCommon fangtooth A small, black deep-sea fish with large fangs found worldwide.Other · Open ocean · 1833 WorldClark's anemonefish A widely distributed marine clownfish with variable colour patterns.Reef fish · Coasts and shelves WorldLeaf scorpionfish A small reef fish that mimics a drifting leaf to ambush prey.Other · Coral reefs · 1802 🇷🇺 RussiaSterlet A small Eurasian sturgeon found in rivers flowing to the Black, Azov, and Caspian seas.Ancient · Rivers and lakes · 1758 🇺🇸 United States and 1 moreShortnose sturgeon A small, endangered North American sturgeon with a short snout.Ancient · Rivers and lakes · 1818 🇺🇸 United StatesShovelnose sturgeon Smallest North American freshwater sturgeon, known for its shovel-shaped snout and caviar production.Ancient · Rivers and lakes · 1820 🇲🇽 Mexico and 2 moreTropical gar A small freshwater predator from Central America known for its armored scales and air-breathing ability.Ancient · Rivers and lakes OceaniaPink skunk clownfish Small reef fish with a white dorsal stripe and algae diet.Reef fish · Coral reefs · 1855 OceaniaMaroon clownfish Large, aggressive anemonefish with a distinctive cheek spine.Other · Coral reefs 🇺🇬 Uganda and 2 moreSilver cyprinid A small pelagic fish from Lake Victoria that supports regional food security.Other · Rivers and lakes 🇺🇬 UgandaNangnang fish A small freshwater fish from the Nile basin, prized as a fried snack in Uganda.Other · Rivers and lakes 🇲🇼 Malawi and 2 moreMalawi eyebiter Predatory cichlid from Lake Malawi known for its narrow body and unique feeding habits.Cichlid · Rivers and lakes 🇺🇸 United States and 2 morePumpkinseed A small freshwater fish native to eastern North America, known for its bright colours and red ear flap.Perch-like · Rivers and lakes · 1793 🇺🇸 United States and 2 moreGreen sunfish A small, aggressive freshwater fish native to North America, known for its blue-green colour and invasive potential in nPerch-like · Rivers and lakes WorldRaccoon butterflyfish A striped marine fish with a distinctive facial mask.Reef fish · Coasts and shelves · 1802 🇺🇸 United States and 1 moreDesert pupfish Small desert fish that survives extreme heat and saltOther · Rivers and lakes · 1853 🇺🇸 United StatesDelta smelt A tiny, endangered fish native to California's Sacramento-San Joaquin River Delta.Other · Rivers and lakes · 1963 WorldGiant oceanic manta ray The world's largest ray, a massive filter-feeding predator of tropical oceans.Ray · Coasts and shelves · 1827 OceaniaBluestreak cleaner wrasse A small reef fish that cleans parasites from larger marine animals.Reef fish · Coral reefs WorldBird wrasse A long-snouted Indo-Pacific reef fish that changes sex.Reef fish · Coral reefs OceaniaOrange clownfish Bright orange reef fish with three white barsReef fish · Coral reefs 🇳🇬 NigeriaHingemouth Small African fish with a unique proboscis-like mouthOther · Rivers and lakes Northern cavefish 🇺🇸 United StatesNorthern cavefish A blind fish living in caves of Kentucky and IndianaOther · Rivers and lakes 🇨🇳 China and 4 moreChinese hooksnout carp A small freshwater minnow native to East and Southeast Asia.Carp · Rivers and lakes WorldMandarinfish A small, brightly coloured Pacific fish kept in saltwater aquariums.Other · Coasts and shelves · 1927 🇮🇩 IndonesiaBanggai cardinalfish A small, endangered marine fish from Indonesia known for its unique breeding habits and popularity in the aquarium tradeReef fish · Coasts and shelves 🇺🇸 United States and 2 morePupfish Small killifish known for surviving in extreme isolated waters.Livebearer · Rivers and lakes 🇦🇹 Austria and 4 moreStreber A small freshwater perch found in fast-flowing European rivers.Perch-like · Rivers and lakes 🇮🇳 India and 4 moreZebrafish Small striped fish from South Asia kept in aquariums and labsCarp · Rivers and lakes WorldMarine hatchetfish Small deep-sea fish with a distinctive compressed body shape and bioluminescent camouflage.Other · Open ocean WorldRoyal gramma Small violet and yellow reef fish from the western Atlantic.Reef fish · Coral reefs WorldFire goby A colourful reef dartfish with a yellow head and red tail.Reef fish · Coral reefs WorldThree-spined stickleback Small northern fish known for rapid evolution and complex breeding.Other · Rivers and lakes WorldNinespine stickleback Small freshwater fish with variable spines found across the Northern Hemisphere.Other · Rivers and lakes EuropeEuropean bullhead Small freshwater sculpin found in European rivers and streams.Other · Rivers and lakes WorldYellow prawn-goby A small, colourful goby that shares burrows with shrimps.Other · Coasts and shelves WorldLagoon triggerfish A small, territorial reef fish with precise swimming and maternal care.Reef fish · Coral reefs East AsiaTomato clownfish A bright orange-red marine fish from the Western Pacific.Reef fish · Coasts and shelves

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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.