When a large fish comes after puffer the inflates body to increase size what type of behavior is this?

The behavior displayed by puffer fish when they inflate their bodies to increase their size in the presence of a large fish is known as deimatic behavior. This type of behavior is a defensive mechanism employed by many animals to deter predators or potential threats.

Deimatic behavior involves making oneself appear larger and more intimidating to scare off potential predators. When a puffer fish senses a predator, it will rapidly inflate its body by swallowing water or air, making itself appear much bigger than its actual size. This sudden increase in size is often accompanied by the fish displaying its spines or sharp body parts to further deter the predator.

The main purpose of deimatic behavior is to make the puffer fish seem less appealing or dangerous to the predator. By appearing larger and more threatening, the puffer fish increases its chances of survival by discouraging the predator from attacking. This defensive strategy can be effective against predators that may be deterred by the perceived risk or effort required to consume a larger or spiny prey.

Deimatic behavior is commonly observed in various species of pufferfish and is part of their natural defense mechanisms against predators. By rapidly inflating their bodies and displaying deterrent features, pufferfish can often avoid being preyed upon and increase their chances of survival in their natural environment.