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Is it safe to swim naked in lakes (rather smaller ones) in Northern Europe (north from Alps), when it comes to possible interactions with the fauna?

I wouldn't expect to meet fishes such as infamous Candiru in the Northern Europe, but are there any fishes or other animals, that could be possible dangerous to the most delicate body parts, making swimming without pants not a very good idea?

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Just to note: by the Northern Europe I've understood the part that is not Southern Europe, so the half north from Alps :) –  Donaudampfschifffreizeitfahrt Jul 20 '13 at 21:13
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@Lbell in that case even an armor wouldn't make a difference –  Donaudampfschifffreizeitfahrt Jul 25 '13 at 17:16

2 Answers 2

As gerrit notes, swimming in lakes is common in Scandinavia, and there's not a lot of fauna in them that could even potentially be harmful.

Some lakes in southern Sweden apparently do have leeches, which can attach themselves to exposed human skin or, in some cases, to the insides of body cavities. If you were planning to swim in a leech-infested lake (a questionable choice to begin with), I would suggest using swimwear and keeping your head out of the water just in case. Fortunately (for swimmers), leech populations in Scandinavia have declined dramatically over the last century, mainly due to changes in agricultural practices, to the point where they're nowadays all but extinct in Finland and northern Sweden, and fairly rare even in the south.

The only other aquatic animals I can think of in Scandinavia that might be harmful to swimmers are pikes, which do occasionally bite humans (usually in the foot), mistaking them for prey. Swimwear won't help you with that, but fortunately it's also a very rare occurrence, and in any case rarely if ever causes any permanent damage. The same goes for other potentially dangerous wildlife that you might occasionally find in or on lakes, such as angry waterfowl defending their young. For those, the best defense is basic common sense: don't get between a baby swan and its mom, don't climb on rocks full of seagull nests, and if something hisses or screeches at you, take the hint and leave it alone.

That said, there is at least one somewhat dangerous animal that you should watch out for when going naked outdoors in Scandinavia, although it's not found in water but on dry land: ticks, whose bites can spread Lyme disease and tick-borne encephalitis. Fortunately, the infection risk is fairly small if the tick is prompty removed, and going swimming presents a good occasion to check your body for any unwanted hitch-hikers that might have attached themselves during the day.

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I know ticks, for them it's enough to have a bit space between boots and trousers to get to the body part they'd like. –  Donaudampfschifffreizeitfahrt Jul 20 '13 at 21:11
    
From experience lake swimming in heavily pike-populated waters in western russia, I've never heard of anyone getting bitten by a pike while swimming (but I've been bitten plenty of times getting the hook out of its mouth) –  crasic Jul 22 '13 at 0:51
    
@crasic: Yeah, it's pretty rare, as in "you hear about it on the news occasionally" rare. I just wanted to try to be as comprehensive as I could. –  Ilmari Karonen Jul 22 '13 at 13:29

Swimming is a popular summer pas-time in Sweden and Finland. In rural areas, it's still common for schools to have swimming lessons outside, in lakes. I'm pretty sure there's no risk from fauna in Swedish lakes.

If you go too far north, you could risk hypothermia ;).

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