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fish: Quick Facts

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News •

Sunlight makes biodegradable plastic particles more harmful to fish • Oct. 21, 2026, 1:46 PM ET (Earth.com)
Fish missing for decades return as China’s Yangtze River recovers • Oct. 20, 2026, 10:47 AM ET (Earth.com)

Photos and Videos

A porcupine fish in the Andaman Sea
A tiger shark, Galeocerdo cuvier, swims in clear, shallow water above a sandy and rocky sea floor.
lamprey
Illustration of an opah (Lampris guttatus), also known as a moonfish, showing its round, laterally compressed body with silvery scales covered in white spots and reddish fins, alongside a scale bar indicating its large size.
harlequin fish
pencil fish
Oyster toadfish
Illustration of a tropical two-wing flying fish (Exocoetus volitans) showing its long, wing-like pectoral fins and streamlined silvery-blue body, with a scale bar indicating size.
Illustration of a female and male mosquitofish (Gambusia affinis) shown side by side for size comparison, with the larger, rounder female above the smaller, slimmer male; a scale bar below indicates length in centimeters and inches.
Bluefin tuna swimming underwater in a group, with silvery bodies and streamlined shapes, near Japan.
How do fish survive under icy lakes in winter?
Watch footage of the deepest fish ever caught on camera
All about ray fins: Seahorses, trunkfish, and more
See how sea creatures have evolved different adaptations to both catch prey and avoid becoming prey
Examine commensalism among fish species such as shrimp, the neon goby, and moray eels
See All Videos and Images →

Related Topics and References

Topics
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Key People

David Starr Jordan
David Starr Jordan
American ichthyologist, educator, and eugenicist
Louis Agassiz
Louis Agassiz
Swiss-born American naturalist, geologist, and teacher
Eugenie Clark
Eugenie Clark
American ichthyologist
Rafinesque, Constantine Samuel
Constantine Samuel Rafinesque
Turkish naturalist
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Étienne de La Ville-sur-Illon, comte de Lacépède
French naturalist and politician
default image
Lev Simonovich Berg
Russian geographer and zoologist

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