air bladder
Fish flotation device
An air bladder is a gas-filled sac in fish that controls buoyancy, allowing them to rise or sink without expending energy swimming.
Also called a swim bladder.
The term extends to similar inflatable structures in other organisms, such as the float chambers in seaweed that keep fronds near the water's surface.
Fluid's upward resistance
- inflatableExpandable by air
- lifejacketBuoyant vest for water
- buoyTethered nautical signal
- lifebuoyThrowable flotation device
pontoon · water wings · raft · life vest · rescue equipment · survival gear · marine safety · buoyancy aid
Small fluid-filled sac
- sacBodily pouch structure
- membraneThin tissue sheet
- gas-filledContaining trapped vapor
- organBody's working component
inflation · deflation · elastic · chamber · pouch · lining · epithelium · connective tissue
Saltwater aquatic plants
- kelpLarge brown marine algae
- floatBuoyant object or vehicle
- algaePrimitive aquatic photosynthesizers
- aquatic plantVegetation growing in water
gas-filled · sargassum · rockweed · marine algae · photosynthesis
Balanced submersion state
- teleostBony, ray-finned fish
- ichthyologyScientific study of piscine life
- oval windowMiddle ear opening
buoyancy
Fluid's upward resistance
- inflatableExpandable by air
- lifejacketBuoyant vest for water
- buoyTethered nautical signal
lifebuoy · pontoon · water wings · raft · life vest · rescue equipment · survival gear · marine safety · buoyancy aid
vesicle
Small fluid-filled sac
- sacBodily pouch structure
- membraneThin tissue sheet
- gas-filledContaining trapped vapor
organ · inflation · deflation · elastic · chamber · pouch · lining · epithelium · connective tissue · expansion
seaweed
Saltwater aquatic plants
aquatic plant · gas-filled · sargassum · rockweed · marine algae · photosynthesis
neutral buoyancy
Balanced submersion state
- teleostBony, ray-finned fish
- ichthyologyScientific study of piscine life
- oval windowMiddle ear opening
- aquatic adaptationsgills, fins, flippers, webbed feet, streamlined body
- fish anatomygills, fins, tail, eye, pelvic fins
- algae biologythallus, chloroplast, rhizoid, spore, gametophyte
- inflatablesballoon, pool float, inflatable boat, beach ball, bounce house
- plant partsleaf, stem, root, leaves, flower
- algaealgae, green algae, chlorella, red algae, kelp