Little aliens swimming

[iPa41000]

Hi,

Often I have noticed littles aliens swimming in my swimming pool.
They are good swimmers and pretty cute, but much less cute under the microscope
Someone knows what it is ?

[Udonhoward]

They are water boatmen, an aquatic insect, a true bug in the family Corixidae.

[iPa41000]

I’ve forgot, they are about 5-6mm

[iPa41000]

I have just made an Image reverse search, and I got this:
Anisops sardeus (Heteroptera)

[kopkei]

my wife says แมงหัวควาย ,buffalo head fly , when many together can fry and eat ...seib seib , why am i not surprised