Those who dare to confront them run the risk of dying from suffocation due to the content of Tetrodotoxin they possess in their bodies. Despite going unnoticed at first sight, all bubblefish (as they are also known) have their body provided with a large number of thorns which scare away their potential predators. They also have an extremely elastic stomach, which they can fill with water, and even air, to make it much bigger and spherical. Puffer fish have an excellent vision, and employ the high speed provided by their dorsal and pectoral fins as their first defense mechanism in presence of any potential danger.Their second defense mechanism, but the best known by all, is their ability to swell and frighten their stalkers. We invite you to read our article the anatomy of fish to leanr more about such a topic The throat and belly have a uniform white silver tone, while the body possesses several black ocelli bordered of yellow and another smaller located on both sides, at the beginning of the caudal fin. There is no apparent sexual dimorphism and the dominant color of this species ranges from the yellow-green, in the upper part of their body to the brown olive on their back. On the other hand, it is important to point out that the dorsal and pectoral fins are highly effective motor organs that give Puffer fish a very agile swimming, and even quickly modify the direction of their displacement. They lack pelvic fins, and their tiny dorsal fin is located at the bottom of their back close to the caudal appendix. Their eyes are quite large and black, with bluish minks, being rounded by a golden or copper iris and can be confused with the ocelli that dot their body.
However, their most outstanding characteristics are the innumerable thorns which cover their body except for their mouth.
Their size can reach a length close to 20 cm, although in captivity hardly exceed 10.
Puffer fish have a sturdy body with a large, bulky and wide head.
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