Name two functions of the swim bladder.

Describe two methods of reproduction that can be found in bony fishes.

9. Recognizing Relationships Explain how coun-tercurrent flow allows the diffusion of more oxygen into the blood than would be possible if blood and water flowed in the same direction.

The fish brain, like the shark brain, has a well-developed medulla to coordinate muscle control.

figure 39-16

This male ringtailed cardinal fish, Apogon aureus, is carrying fertilized eggs in its mouth.This behavior lowers losses of eggs to predators and contributes to the success of the species.

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