Greetings.

Sarcastic fringehead, It is characterized by having a large wide mouth and a territorial behavior. When two of these fish face each other in a territorial fight, they fight by pressing their outstretched mouths, as if they were kissing, using their sharp teeth in these confrontations this allows them to determine which of the specimens has a larger mouth, thus establishing their dominance.

Source

These fish are found in the eastern Pacific Ocean, off the coasts of North America, from San Francisco (California) to Baja California. It inhabits depths between 3 and 73 m.

Source

After the female has laid the eggs under a rock or in a clam burrow, it is the males who are responsible for protecting the eggs.

Characteristics:

They can be up to 30 cm long.
Their bodies are long and slender
They are generally devoid of scales
They have large pectoral fins while the pelvics are reduced.

What makes them amazing?

In addition to having an impressive set of teeth, these fish have antennae or combs on their heads that are used to detect chemical substances from other fish or perceive movements in the water to defend their burrow or feed.

Source

They are very fast to attack and can expand their jaws making their mouths very large when fighting against other fish. The intimidating coloration of the mouth, combined with the extreme nature of its size (which can be up to four times its closed size) allows the larger male to establish dominance over the smaller one.

References.

https://oceana.org/marine-life/ocean-fishes/sarcastic-fringehead
https://en.wikipedia.org/wiki/Sarcastic_fringehead

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