Help me to identify this stream insects
Attempt at an answer

I think it is a water strider. There are 1700 species of water strider. Some of them are easy to eliminate (the marine ones typically) but I am not really able to give you more info from your picture.

To make sure, it is a water strider, can you please tell us
- How long are the legs (hard to tell form the picture)?
- If it was alive, was it standing on water? What can you tell us about its behaviour?

What insects live in the water?

If it is a stream insect, it could be...


a mosquito larvea
a mayfly larvea
a odonate (dragonfly or damselfly) larvea
a water strider


Here are my thoughts for each of them


a mosquito larvea


No, mosquito larvea don't any limbs

a mayfly larvea


I can't see the long cerci

a odonate (dragonfly or damselfly) larvea


Again I can't see the cerci
Also, although, it is often hard to see, it does not appear to have a fancy detachable mouth piece.

a water strider


We can't tell the length of the limbs from the picture. Were they really long?
If it was alive, was it standing on the water?