Blowfish

The Blowfish (フグ, Fugu) is a fish introduced in that can be found in the ocean between November and February. It can be sold for 5,000 Bells.

The Blowfish is one of two fish introduced in that can only be caught from 9 PM to 4 AM, the other being the Saddled Bichir.

In
Upon donation of the Blowfish, the information board outside the tank that houses the Blowfish says the following:

"Blowfish are considered a delicacy, famous for their tempting taste despite being highly poisonous. Blowfish are not poisonous at birth, though, which makes young ones relatively safe for consumption. It's only once they have ingested enough microbes from seawater and food that they become poisonous. When they feel threatened, they suck in air and water to blow themselves up like balloons. This makes them too big to eat without predators being forced to chomp down on their poison quills."

In New Horizons
Blathers will say the following when given a Blowfish:

"''As you may know, blowfish carry a deadly poison and are among the most toxic creatures on earth. What you may not have known is that poison and spines are not the limit of this animal's defenses! A predator that tries to swallow a blowfish before it inflates can find itself quickly choking. To be honest, if said predator can get past poison, spines, AND choking hazards, I feel they've earned a meal.