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Hello,

A Culicidae found in North of France, at Haverskerque, the 09 July 2021, in large number, near a pasture and a slow water stream
Maybe an Aedes sp. or an Ochleroratus sp. ?

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2nd picture

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3rd picture

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I think another Oc. sticticus. They like to breed in temporary pools (such as flooded pastures) ideally (though not always) with some shade.

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Thanks you very much for all your replies, Tony !

I think it is very likely that there is temporary pools in the close pastures, there is also a garden nearby with a large pond with frogs and lots of lilypads, also the small stream (which is maybe even stagnant water) is covered with Lemna minor