Hard to tell from the photo if he's swimming rightside up or upside down. Rightside up = corixidae (water boatman, http://en.wikipedia.org/wiki/Corixidae), they only eat plants.

Upside down = predatory backswimmer, usually the ones that bite, not that you want to get that close smile

http://en.wikipedia.org/wiki/Notonectidae

Last edited by Bocomo; 05/20/13 05:08 PM.
Our old pond project (updated 4/11/17)
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