Question

While gutting a fish, Nathan encountered an air-filled sac-like structure. What is the purpose of this structure in fish?

A.
It enables fish to breathe in water.
B.
It serves as a reserve space to store fat.
C.
It harbors bacteria that benefit the fish.
D.
It provides buoyancy to the fish.

Answer 1

D. It provides buoyancy to a fish.

Step-by-step explanation:

Answer 2

D. It provides buoyancy to a fish.

This air pocket is known as the swim bladder, and also called air bladder. This is a buoyancy organ possessed by most bony fish. The air bladder is located in the body cavity and is derived from an out pocketing of the digestive tube.