this insect I found on a stream in the southern region of Bangladesh. Its dorsal part is fully black and head and thorax is yellowish with black spot. Body size approx. 5-6mm, limbs 8-10mm
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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...
Here are my thoughts for each of them