Diversity of Fishes
Figure 2. Suction demonstrated
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Fierce suction develops as a result of jaw protrusion. As a result, mouth volume increases and water and prey are forced into the fish's now tube-like jaws. Bones recruited to protrusion include those of the upper and lower jaws (mandible, maxilla, premaxilla) and many bones of the skull itself (ethmoid, palatine, supsensorium). A fish's head is made up of over 30 moveable bony parts controlled by more than 50 muscles.

Bubbles indicate direction of suction created by jaw protrusion.
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