Generally, fish have swim bladders in their bodies, and the density of the body can be adjusted by changing the size of the swim bladder to control the ups and downs of the fish body.

But the shark is a relatively primitive cartilaginous fish, no swim bladder, if the shark wants not to sink to the bottom, in addition to relying on the regulation of the liver, can only keep swimming forward, in addition to constantly swimming in the water can also make the seawater form a current, rush into the gill hole, flow through the gills, fresh seawater has a high oxygen content, and the blood in the capillaries in the gills for gas exchange, so as to complete the breathing, which is why the shark never waits in the dark for the rabbit to wait for the opportunity to pounce on the prey.

At this time, the giant shark in front of Zhang Yingshan was controlled by the underwater merman, and the momentum went straight to Youfu

Chapter 34 of "The Hidden Soul of the Four Seas" is being hit by hand, please wait a moment,

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