The blowfish is poisonous. Pufferfish is also known as pufferfish, the part where the toxin is located and seasonal changes in the part where the toxin is located in the viscera of the fish body. It includes: reproductive glands, liver, stomach and other parts of the body, the size of its toxic content, but also due to different breeding environments and seasonal changes and differences, according to the Yangtze River dolphin and artificial cultivation of pufferfish proved that the toxicity of various organs compared as follows: ovary → spleen → liver → blood tendons → eyes → gill rakers → skin → spermatic nest → muscle. The comparison of toxicity of organs of cultured pufferfish (above 2 years old) is consistent with that of wild pufferfish, but with lower toxin content.

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The river herring has a rounded body shape and relies primarily on its pectoral fins for propulsion. Such a body shape allows for nimble spinning but is not fast, making it an easy target to hunt. As a result, river herring have evolved a self-defense mechanism that is quite different from that of ordinary fish. When threatened, river herring are able to quickly draw water or air into their highly elastic stomachs, expanding several times their size in a short period of time to scare off predators. The spiny river herring, a member of the Spiny Puffer family, is even armed with spines, which rise up all over its body when it expands, making it difficult for predators to swallow it.

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