774 articles
Trisopterus esmarkii
Trisopterus esmarkii, the Norway pout, is a small gadid fish of the Northeast Atlantic, abundant in the northern North Sea, spawning between Shetland and Norway, and caught mainly for fishmeal.
Trout
Trout: salmonid fishes (genera Salmo, Oncorhynchus, Salvelinus) of cool freshwater, some anadromous; prized game fish, widely introduced, with rainbow and brown trout among IUCN's 100 worst invasive species.
Tuna
Tuna: large Scombridae oceanic fish with thunniform swimming, endothermic red muscle, and retia heat exchangers; 23 commercial stocks managed by five RFMOs; main products canned tuna and sashimi.
Turbot
Turbot (Scophthalmus maximus, formerly Psetta maxima) is a large left-eyed European flatfish fished from the North Sea to the Black Sea and farmed on shore, with Spain harvesting 10,058 t in 2024 and China the largest farmed producer.
Unagi (うなぎ)
Unagi (うなぎ) is the Japanese term for freshwater eel, chiefly Anguilla japonica, eaten as kabayaki grilled eel. Endangered IUCN status, capture-based farming, and the rejected 2025 CITES Appendix II listing proposal define it.
Urophycis chuss
Urophycis chuss, red hake or squirrel hake, a demersal gadid of the northwest Atlantic from the Gulf of St. Lawrence to North Carolina; two stocks, small-mesh trawl bycatch fishery, discards about 60 percent of catch.
Vasotocin
Vasotocin is a nonapeptide neurohypophysial hormone of non-mammalian vertebrates, from cyclostomes through birds, that maintains osmotic balance and is the ancestral hormone from which mammalian vasopressin and oxytocin arose.
Vimba vimba
Vimba vimba, the vimba bream (Cyprinus vimba), is a European Leuciscidae cyprinid of Caspian, Black, Marmara, Baltic and North Sea basins; semi-anadromous, spawning on gravel riffles, IUCN Least Concern.
Wahoo
Wahoo (Acanthocybium solandri, also called ono) is a monotypic, worldwide tropical scombrid gamefish reaching 210 cm and 96 kg, caught mainly as longline bycatch; IUCN Least Concern, data-poor stocks.
Walleye
Walleye (Sander vitreus), also yellow walleye or walleyed pike, a North American freshwater perch-family game and food fish with light-adapted eyes, canine teeth, and spring spawning at 42-50 F.
Wels catfish
Wels catfish (Silurus glanis), also sheatfish or European catfish: Europe's largest freshwater fish, native to Europe and Asia, a nocturnal apex predator up to 2.73 m and 130 kg, invasive in much of Europe and Lacey Act-banned in the US.
Whale shark
Whale shark (Rhincodon typus, tiburon ballena), the largest living fish, a filter-feeding shark of tropical and warm temperate seas reaching 18-20 m. IUCN Endangered; CITES Appendix I since 2026; distinct from whales, which are mammals.
White sturgeon
White sturgeon (Acipenser transmontanus), also called Pacific or Columbia sturgeon, is North America's largest freshwater fish, native from Ensenada, Mexico to Alaska; a CESA candidate species in California with declining populations.
Whitebait
Whitebait (New Zealand): juveniles of six galaxiid fish caught in tidal rivers; season 1 Sep–30 Oct under the Whitebait Fishing Regulations 2021, managed by DOC; four species at risk, TACC zero.
Wobbegong
Wobbegongs are carpet sharks of the family Orectolobidae, ambush predators of the Indo-West Pacific sea floor with head dermal lobes and carpet-like camouflage; largest, the spotted wobbegong, reaches 3.2 m.
Wrasse
Wrasses (Labridae) are a large marine fish family of roughly 500–600 species on tropical and temperate reefs, known for protogynous sex change, cleaner wrasse mutualisms, and use as cleaner fish in salmon farming.
Xi Yiang
Xi Yiang, FEOW freshwater ecoregion 763, Indo-Malay realm; the Pearl River (Zhu Jiang) basin in Guangdong, Guangxi, Guizhou, and Yunnan, draining to the South China Sea with over 90 endemic fish species.
Yellow perch
Yellow perch (Perca flavescens) is a North American freshwater perch with barred golden flanks and two dorsal fins; Great Lakes food fish, peak Lake Erie catch 13,546 t (1969), now mostly farmed.
Yellowfin tuna
Yellowfin tuna (Thunnus albacares), also called ahi or kihada, is a large tropical tuna of all three oceans, up to 6 ft and 400 lb, fished by purse seine, longline, and baitboat; IUCN Least Concern since 2021, with the Indian Ocean stock rebuilt after overfishing from 2015 to 2021.
Yellowtail amberjack
Yellowtail amberjack (Seriola lalandi), also called yellowtail kingfish or hiramasa, is a large carangid gamefish of subtropical seas, split into three species, farmed in Japan and Australasia, and fished in South Africa and Australia.
Zander
Zander (Sander lucioperca), or pikeperch, is a large European percid fish native to continental Europe and western Siberia, related to walleye and sauger, listed as injurious in the US, and intensively farmed in Europe.
Zebrafish
Zebrafish (Danio rerio), a small striped South Asian freshwater fish, is a premier vertebrate model organism: transparent embryos, 200–300 eggs weekly, ~70% human disease gene homologs, sequenced GRCz11 genome, and over 1,000 laboratories using it.
Zeugopterus punctatus
Zeugopterus punctatus, the common topknot or Bloch's topknot, is a left-eyed scophthalmid flatfish up to 25 cm from the northeastern Atlantic, North Sea, and Mediterranean, known for attaching to vertical rocks via a proposed Venturi-effect mechanism.
Zoarces viviparus
Zoarces viviparus, the viviparous eelpout or viviparous blenny, is a Zoarcidae fish from the White Sea to the English Channel that bears live young and serves as a Baltic and North Sea pollution bioindicator.