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As temperatures climb, refreshing salt water beckons. But when you take the plunge into the ocean's cooling surroundings, don't forget about the translucent creatures--which are critical to the marine ecosystem--swimming nearby. To find out just how poisonous they might be, read the Green Guru's to a reader's question.
Are all jellyfish poisonous? What should I do if I get stung by one?
鈥擩ane McMahon, Fort Lauderdale, FL
Those gelatinous, undulating creatures we call jellyfish all produce at least some toxin, but not every species is dangerous to humans.
There are a couple thousand varieties worldwide, from small sea nettles to large moon jellies, and the severity of their stings varies. A handful are deadly.
Some of the most dangerous are box jellyfish, which have 10-foot tentacles and the planet鈥檚 most potent venom. (They are found mostly in waters off the coast of Australia.) By contrast, others, like cannonball jellies鈥攖ennis- to soccer-ball sized blobs that have a reddish-brown pattern and live primarily in the Gulf of Mexico鈥攄on鈥檛 usually affect humans.
No matter the size or toxicity, jellyfish are crucial to ocean health. 鈥淚n spite of the fact that when their numbers are high they鈥檙e often considered a nuisance, in many areas they鈥檙e actually an important part of the natural ecosystem,鈥 says Denise Breitburg, a scientist at the Smithsonian Estuarine Research Center. They use their venom to kill or paralyze prey鈥攗sually zooplankton and small fish鈥攁nd help to keep those populations in check.
If a jellyfish stings you, get out of the water and ever so carefully remove the tentacles with a towel or sand (or anything other than your hand, to prevent further stinging). Contrary to popular belief, peeing on the area won鈥檛 relieve the burn. Instead, try to soothe the pain with vinegar or a paste made of baking soda, and see a doctor if you feel sick. The next time you hit the waves, take the sting out of your day at the beach by appreciating those translucent swimmers from a distance.