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swim bladder
This term is a specialized biological compound noun used primarily in ichthyology and marine biology. It describes a specific anatomical structure, and as such, it is used in a technical, descriptive register rather than a casual or metaphorical one.
Because it refers to a specific organ, it follows standard English countability rules for anatomical parts. When discussing the general organ across a species, it is used in the singular; when referring to multiple fish or multiple organs within a specimen, the plural form is used.
Meanings
Examples
The swim bladder allows the fish to maintain its position in the water column without wasting energy.
The swim bladder allows the fish to maintain its position in the water column without wasting energy.
Most bony fish use a swim bladder to regulate their buoyancy.
If the swim bladder is damaged, the fish may struggle to swim upright.
The gas inside the swim bladder expands as the fish rises to the surface.
I wonder how the swim bladder adapts to extreme deep sea pressure.
Some species of fish can use their swim bladder to produce sounds.
The specimen shows a clearly defined swim bladder in the abdominal cavity.