Smooth Toadfish by julianneovie

Smooth Toadfish

Despite the friendly look, smooth toadfish is toxic. Its toxicity is due to tetrodotoxin, which is concentrated particularly in the liver, ovaries, intestines and skin. Many species of pufferfish bear this toxin, obtaining it from tetrodotoxin-containing bacteria in their diet.

Tetrodotoxin is extremely toxic, approximately 100 times more poisonous than potassium cyanide. The smooth toadfish is useful, though, for scientific research. Because it is an abundant species, it is used to measure pollutant levels (particularly heavy metals) in its environment.
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