Portuguese Mon O' War

Since we were discussing these creatures today in class, I decided I would make a blog on the Portuguese Mon O' War. I remember when I was younger my parents went on a cruise and when they came back they told me that there was a swing on the boat that you could swing off of to jump into the water, and an unfortunate individual jumped onto a Man O' War and was in rough shape. It is also interesting that a creature that is not a predator can be so harmful to humans.

The Portuguese Man O' War (Physalia physalis), also known as the blue bubble or bluebottle, is commonly thought of as a jellyfish but is actually a siphonophore—a colony of four sorts of polyps.The Man O' War's float is bilaterally symmetrical with the tentacles at one end, while the chondrophores are radially symmetrical with the sail at an angle. Also the Man O' War has a siphon, while the chondrophores do not. The Portuguese Man O' War has an air bladder; known also as a pneumatophore or sail, that allows it to float on the surface of the ocean. It has no means of propulsion and is pushed by the winds and the current. The sail is filled with air, but may build up a high concentration of carbon dioxide (up to 90%). The bladder must stay wet to ensure survival; every so often it may roll slightly to wet the surface of the float. To escape a surface attack, the pneumatophore can be deflated allowing the Man O' War to briefly submerge.

The sting from the tentacles is potentially dangerous to most humans; these stings have been responsible for several deaths, but usually only cause excruciating pain. Detached tentacles and specimens washed up on shore can sting just as painfully as the full creature in the water, for weeks after detachment. The venom can travel up to the lymph nodes and may cause, depending on the amount of venom, more intense pain. In extreme cases medical attention is necessary.
According to a study done by Dr. Geoffrey Isbister of Newcastle, Australia's Mater Hospital in 2003 through 2005, the best treatment for a sting is to apply hot water to the affected area. Hot water used in the study was fixed at 45 degrees Celsius (113 Fahrenheit). The hot water eases the pain of a sting by denaturing the toxins.
Applying ice to the area of the sting is also a fairly effective way to suppress the pain. Ice works by making the toxins less active and reduces the sensation and therefore pain of the area of skin around the ice. Additionally, ice constricts blood vessels, reducing the speed at which the poison travels to other parts of the body, including the brain; heat has an opposite effect. It was originally thought that applying ice was the best way of dealing with Man O' War stings before the study was done. Lifesavers around the world still use ice to treat the stings of this species.

(All information for this blog entry is from Wikipedia)