If a ray-finned fish is to both hover (remain stationary) in the water column and ventilate its gills effectively, then what other structure besides its swim bladder will it use?
A) its pectoral fins
B) its lateral line system
C) its caudal (tail) fin
D) its operculum

Question

Quizplus · Accepted Answer

The operculum, which covers the gills, plays a crucial role in the process of ventilating the gills by allowing water to flow over them, even when the fish is stationary. This is essential for gas exchange while the fish hovers in the water column.

If a Ray-Finned Fish Is to Both Hover (Remain Stationary)