nounpl. -·tails· or -·tail·
- any of a genus (Seriola) of large, marine, food and game jack fishes; esp., a species (S. lalandei) of the Pacific
- any of various other fishes having a yellowish tail, as the yellowtail snapper (Ocyurus chrysurus), the yellowtail flounder (Limanda ferruginea) of the W Atlantic, the yellowtail rockfish (Sebastes flavidus) of the E Pacific, and the silver perch (sense )
- Any of several large marine fishes of the genus Seriola having a yellowish tail, especially S. lalandi of subtropical waters worldwide, which is a popular game fish in coastal waters of southern California and Mexico.
- Any of several other fishes having a yellowish tail, such as the yellowtail flounder (Limanda ferruginea), the yellowtail snapper (Ocyurus chrysurus), and the North American silver perch.
- yellowtail amberjack, Seriola lalandi.
- A fish native to the northwest Pacific, often used in sushi, the Japanese amberjack, Seriola quinqueradiata.
- Any of various fish with yellow tails, including:
- Atlantic bumper, Chloroscombrus chrysurus.
- yellowtail flounder, Limanda ferruginea.
- yellowtail snapper, Ocyurus chrysurus.
- whitespotted devil, Plectroglyphidodon lacrymatus
- yellowtail horse mackerel, Trachurus novaezelandiae.
- A European moth
- The yellow-tailed black cockatoo, a large cockatoo native to the south-east of Australia.
- The yellow-tailed oriole, a passerine bird in the New World family Icteridae.
- The yellow-tailed woolly monkey, a New World primate endemic to Peru.
- Having a yellow tail.