swim bladder: Quick Facts

Written and fact-checked by

The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	air bladder

Photos and Videos

Diagram showing a teleost fish, specifically a perch, with a side view and a labeled cross section. The cross section identifies internal structures including muscle, vertebra, neural spine, nerve cord, dorsal aorta, dorsal and ventral ribs, swim bladder, coelom, and stomach. The side view shows the location of the swim bladder and stomach inside the fish.

internal structure of fishes

Study the roles of a fish's scales, swim bladder, and gills in its respiratory system

See All Videos and Images →

Topics

baroreception

Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters

Animal Group Names

The bearded vulture (Gypaetus barbatus) is seen in Switzerland on December 2024

Animal Factoids

Lion (panthera leo)

Deadliest Animals Quiz

Mute swan with cygnet. (birds)

Match the Baby Animal to Its Mama Quiz