What organs do fish use to take oxygen from water?
AnswerGills
Water flows over thin gill filaments, where oxygen passes into the blood.
Animals · Facts & stats
Fish facts & stats
7 fact-checked facts about fish, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is the largest living fish?
AnswerWhale shark
The filter-feeding whale shark can grow longer than 12 m; the blue whale is a mammal, not a fish.
Going deeper
What are shark skeletons made of?
AnswerCartilage
Sharks and rays are cartilaginous fish, with flexible skeletons like the tissue in your nose and ears.
What does a fish's lateral line detect?
AnswerMovement and vibrations in the water
The lateral line is a row of sensory organs along each side that senses water movement.
What is a fish's tail fin called?
AnswerCaudal fin
The caudal fin at the tail usually provides the main thrust for swimming.
Expert level
Fish like salmon that hatch in fresh water, live at sea, then return to rivers to spawn are called what?
AnswerAnadromous
Anadromous fish migrate up rivers to breed; catadromous fish like freshwater eels do the reverse.
A living coelacanth, a fish once thought extinct, was found in 1938 off the coast of which country?
AnswerSouth Africa
A coelacanth was caught near East London, South Africa, and spotted by museum curator Marjorie Courtenay-Latimer.
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