Venom study of poison-toothed mackerel.

It's strange that fish have poisonous teeth, but even more strange is a fish with poisonous teeth that can be used to attack predators to protect themselves.
new study shows that, unlike the pain caused by bites from other poisonous fish, the venom of poison-toothed mackerel is not painful when tested in mice.
In contrast, the venom of the catfish causes the attacker's blood pressure to drop by nearly 40% in a very short period of time, which in the wild causes potential predators, such as grouper, to slow down, leaving enough time for the catfish to escape.
more interesting is the way this strange poison-toothed mackerel, which has the same components as the venom of scorpions and conical snails, evolves.
When scientists used the DNA of 11 species to build a life-evolving tree for the herring family, they found another surprising thing: unlike most poisonous animals, they evolved venom before they evolved special injection tools, while poison-toothed mackerel advanced needles to evolve venom, the results of which were published recently in Current Biology.
researchers say they turned their teeth into venom transmission tools with grooves after developing unique enlargements of canine teeth and venom glands.
the result may be the only toxic bite in the animal kingdom used to defend itself rather than hunt for food.
.