Venomous fish

[7] Venomous fish tend to be either very visible, using flamboyant colors to discourage predators from attacking them, or skillfully camouflaged and possibly buried in the sand.

henlei, a species of stingray that is found in Brazil, is toxic to mice that have nociceptive, edematogenic, and proteolysis activities.

These changes stimulate the release of nitric oxide from the endothelial cells, smooth muscle contractions, and other effects of the atria.

Piscine venoms also produce neuromuscular activity effects- depolarization of nerve and muscle cells.

In experimental models and in Western immunoblotting analysis, all tested piscine venoms showed structural similarity, which could lead to the advent of an overarching antivenom or other novel uses.

The most venomous known fish is the reef stonefish . It is an ambush predator which waits camouflaged on the bottom.
The beautiful and highly visible lionfish uses venomous barbs around its body as a defence against predators .
The stargazer buries itself out of sight. It can deliver electric shocks as well as venom.
The stinger of a stingray
Striped poison fang blenny can deliver a quick and painful bite.