A Fish’s mouth can come in different types of sizes, shapes, and orientations.

Fish with the largest mouths, overall size, and sharper teeth are generally the predatory ones. While other fish species have the ability to extend their mouths that allows the fish to lengthen and the ability to easily catch food. But it seems that the mouth of a fish is getting smaller which complicates catching them. 

The general types of fish mouths are superior, other times referred to as supra-terminal, mouths that are upturned. The second type of mouth is known as terminal mouths. It points straight forward and they are highly common. 

The final mouth type that is common amongst fish are inferior, or also known as sub-terminal the shape of these mouths is turned downward. The inferior mouth is the most common type, and often times found in bottom-dwelling species just like the catfish family.

Researchers at the University of California, Riverside, Alberta, Calgary, and Antwerp discovered that taking away the hook from a fish’s mouth after it has been caught can limit the way the fish catch their food. About 35 percent of fish experience reducing in their feeding ability and the fish’s mouth size is also affected.

A common style of how fishes eat is through suction feeding. Bass, salmon, and trout use this type of method. These fish suck on their preys and eat by rapidly expanding their mouths. However, if the fish are often captured and let go free, their mouths will affect and become smaller in size.

Even though fish cannot feel much pain due to the insufficiency amount of brain power they pose, they are still troubled because their mouth size will decrease.

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