Your mention about floating "water bugs" brings up another possible cause.

A trout broke the surface of the lake, snapping at a water bug.

I stared down into the V to see what was making it, expecting a fish or maybe a large water bug of some sort.

Due to their aquatic habits, these animals are known as true water bugs.

More water bug than boat, the 29-foot vessel is called a Trifoiler.

He has more than 150 publications, including the book on evolution of water bugs known to every specialist in the field.

Frank stopped to look at a women's eight, sculling underneath them like a big water bug.

The pilots found that the trick was to hit these water bugs.

But none of these hold a candle to the giant water bug.

Now he says that the water bug has bitten him again.