Pufferfish

Pufferfish are a group of fish in the family Tetraodontidae, known for their ability to inflate their bodies as a defence against predators.

Pufferfish are a group of fish in the family Tetraodontidae, best known for inflating their bodies as a defence against predators. They are found mainly in tropical and subtropical waters, with some species living in brackish or freshwater environments.

What it is

Pufferfish, also called blowfish or balloonfish, belong to the family Tetraodontidae, which includes more than 120 species worldwide. They are bony fish that range in size from about 1 inch to over 2 feet long. Most live in tropical and subtropical marine waters, though some species inhabit brackish or freshwater habitats. Their diet consists mainly of invertebrates and algae, and larger species can crush hard-shelled prey like clams with beak-like teeth.

Why it matters

Many pufferfish species contain tetrodotoxin, a potent poison that can be lethal to humans and other animals. This makes them a significant public safety concern, especially in regions where they are eaten as a delicacy. In Japan, pufferfish are known as fugu and are prepared only by specially licensed chefs. For Canadian readers, pufferfish are relevant through marine biology, aquarium keeping, and seafood safety education, even though they are not native to most Canadian waters.

Key details

Pufferfish defend themselves by inflating their bodies with water or air, making themselves harder to swallow. Many species also have spines and rough skin. Their toxin, tetrodotoxin, is highly poisonous and can cause paralysis or death if ingested. Occasional range shifts and sightings of pufferfish in Canadian waters can interest researchers and coastal communities.