Are there poisonous fish?

Yes, and one of the most devastating is a dog fish. Strong poison, capable of killing a person, is contained in its internal organs - the heart and the liver. Contrary to this, a dog fish is considered a delicacy in Japan, and chefs are specially taught how to cook it, removing poisonous parts. These fish can protect themselves in another way - they are able to fill their body with water and air twice that of their usual size. In this form, they are hard to reach for a predator. In addition, when the fish is swollen, the thorns that cover it are pierced.

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