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 heart
B) its pectoral fins
C) its lateral line system
D) its caudal (tail) fin
E) its opercula
Answer: E
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.