The fish stays in the open ocean, but travels into shallow saltwater and brackish estuaries.

The fish is stout and deep-bodied, with a pointed snout and long continuous dorsal fin.

[2] The fish has relatively large fangs (canine teeth) that protrude from the lower jaw.

[3] The unusual venom, which targets the body's opioid receptors, is being investigated as a potential new painkiller for human use.

The venom reduces the blood pressure of the predator, relaxing its jaws so the blenny can escape.