Proving once and for all that size is absolutely no indication of might, these water parasites might just keep you out of oceans, lakes, or even your own swimming pool. Don't get it twisted; parasites are true predators and can inflict quite a bit of damage on unsuspecting swimmers.

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Cymothoa Exigua
Number Sixteen: Cymothoa Exigua. Also known as sea lice, the Cymothoa Exigua has a particular taste for Pink Snappers, but their relationship is a lot more symbiotic than parasitic--- or maybe just a case of underwater Stockholm Syndrome, depending on your point of reference.

Silver Pearl Fish
Number Fifteen: Silver Pearl Fish. These prolific parasites lodge themselves in a very nasty place, a Sea Cucumber's anus. Fortunately for us, Silver Pearl Fish don't attack humans, but for Sea Cucumbers, they are a wretched pest who loves to eat their hosts' organs, often resulting in internal failure for the doomed Sea Cucumber.

Sacculina Carcini
Number Fourteen: Sacculina Carcini. These parasites prey specifically on crabs, and they are nothing short of petrifying. Sacculina Carcini delight in slipping in through the cracks in crabs' claws and getting down to business, and by business, we mean devouring the crab from the inside out.

Copepod
Number Thirteen: Copepod. We call this one the blindness parasite because of the way that it attaches itself to the eyeballs of its prey and pumps minute amounts of fluid inside until the host animal totally loses its sight.

Lampreys
Number Twelve: Lampreys are the prehistoric nightmare that you've never heard about until now. Prepare never to sleep again. Fortunately, Lampreys are relegated to the ocean's depths, but that hardly makes these bizarre creatures any less terrifying.

Gyrodactylus Salaris
Number Eleven: Gyrodactylus Salaris. Meet the parasite that literally liquefies the skin of its prey. Yes, Gyrodactylus Salaris is a horrid little beast with a nasty habit of latching onto freshwater fish and liquifying the skin with its noxious saliva.

Schistosoma Haematobium
Number Ten: Schistosoma Haematobium. This nasty strain of flatworm is very dangerous to humans, and it enters our bodies through a highly unpleasant way; our skin.

Guinea Worm
Number Nine: Guinea Worm. This deadly parasite can be found mostly in Africa and can cause major headaches when it comes to the drinking water supply. African nations waged war against these microscopic assassins and managed to squash plenty of cases.

Cryptosporidium
Number Eight: Cryptosporidium. Known as "Crypto," this teeny parasite is not a secondary character from the Matrix 2, but the catalyst for a horrible diarrheal disease known as Cryptosporidiosis.

Candiru
Number Seven: Candiru. This brutal bloodsucker is more fish than a parasite, but it's sheer size and preferred method of destroying all of your faith in humanity gives it a place on this list. Candiru are tiny catfish prominent in the Amazon River.

Leeches
Number Six: Leeches. Once used for old-timey medicine, Leeches are the most notorious parasite on the planet. These squishy creepy-crawlies have rows upon rows of teeth, the better to latch onto your skin for bloodsucking.

Giardia
Number Five: Giardia. Giardia is one of the biggest bads on this list because it's often fatal to humans. When it's not, it often causes delirium and explosive diarrhea. Next time you're on a hike and fancy a nice drink out of the local river, think again.

Vibrio Cholerae
Number Four: Vibrio Cholerae. Vibrio Cholarae is the nasty little parasite that causes Cholera, an ancient sickness that still haunts much of the world today. Cholera is a serious diarrheal sickness that you get from sipping on tainted water, and without proper care, you can easily die.

Shigella
Number Three: Shigella. Shigella causes Dysentery, a disease that we all remember from playing the Oregon Trail, but one that is still running rampant in the world today. Dysentery is nothing to snicker at. Its debut appearance is bloody diarrhea, and it just escalates from there, with loose stools, vomiting, and sky-high fevers.

E Coli
Number Two: E Coli. E Coli is one of the most famous bacteria in the world, and there's an excellent reason why. This parasitic monstrosity comes from the Escherichia genius, and many strains are perfectly harmless. The problem comes into play when you run into a strain that causes explosive diarrhea and muscle cramps that will keep you incapacitated for hours on end.

Naegleria Fowleri
Number One: Naegleria Fowleri. Our number one creepiest parasite is actually an amoeba; and a genuinely nightmarish one at that. Naegleria Fowleri is known as the brain-eating amoeba, and it lives up to its ghastly name. Typically, Naegleria Fowleri are harmless, but once they go up your nose, it's a whole different ballgame.

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