Question:
Study the parts (A, B, C and D) labeled in the given picture and identify the category of fish from the options given below :
Study the parts (A, B, C and D) labeled in the given picture and identify the category of fish from the options given below :
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Remember: "Physostome" retains the pneumatic duct connecting the bladder and the gut (pharynx/esophagus), while "Physoclist" has a closed bladder with no duct connection.
Updated On: Jul 21, 2026
- Monorhinous fish
- Physostomous fish
- Physoclistous fish
- Cartilagenous fish
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The swim bladder (or gas bladder) in bony fishes is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy.
Based on the presence or absence of a connection between the swim bladder and the esophagus (gut), teleost fishes are classified into two major categories: physostomous and physoclistous.
Step 2: Detailed Explanation:
In the provided anatomical diagram of the fish, several structures are clearly labeled:
Label A represents the swim bladder itself, located dorsally inside the coelomic cavity.
Label B represents the pneumatic duct, which is a tube-like connection linking the dorsal wall of the esophagus/gut to the ventral side of the swim bladder.
Label C and D represent other internal organs (such as the stomach and intestine).
The presence of a patent pneumatic duct (Label B) is the defining anatomical characteristic of physostomous fishes.
Physostomous fishes (such as carps, herrings, and catfishes) can gulp air at the water surface and force it through the pneumatic duct into the swim bladder to inflate it.
They can also release gas from the bladder by spitting it out (reflex action) when diving deeper.
In contrast, physoclistous fishes (like perches and cods) lose this connection during early development, relying instead on specialized vascular networks (the oval body and gas gland) to regulate gas volume.
Step 4: Final Answer:
Therefore, the fish belongs to the category of Physostomous fish.
The swim bladder (or gas bladder) in bony fishes is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy.
Based on the presence or absence of a connection between the swim bladder and the esophagus (gut), teleost fishes are classified into two major categories: physostomous and physoclistous.
Step 2: Detailed Explanation:
In the provided anatomical diagram of the fish, several structures are clearly labeled:
Label A represents the swim bladder itself, located dorsally inside the coelomic cavity.
Label B represents the pneumatic duct, which is a tube-like connection linking the dorsal wall of the esophagus/gut to the ventral side of the swim bladder.
Label C and D represent other internal organs (such as the stomach and intestine).
The presence of a patent pneumatic duct (Label B) is the defining anatomical characteristic of physostomous fishes.
Physostomous fishes (such as carps, herrings, and catfishes) can gulp air at the water surface and force it through the pneumatic duct into the swim bladder to inflate it.
They can also release gas from the bladder by spitting it out (reflex action) when diving deeper.
In contrast, physoclistous fishes (like perches and cods) lose this connection during early development, relying instead on specialized vascular networks (the oval body and gas gland) to regulate gas volume.
Step 4: Final Answer:
Therefore, the fish belongs to the category of Physostomous fish.
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