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Great video, Lornce. Thanks for posting it. On rivers, backswimmers mostly hunt in the top foot or two of the water column so fly patterns are generally unweighted or lightly weighted. When feeding, sometimes in large swarms, they will land in moving current, usually starting at the drop off into a pool/glide. They are predacious and feed on the emerging or spent mayflies, midges and caddis in the upper water column. Then, when they run out of air, they resurface and either swim to shore or fly back upriver and repeat. During egg laying flights, the females dive bomb and swim down to deposit their eggs in suitable habitat on the stream bed and oftentimes in nearby ponds and sloughs found along the river. In the Fall, I've seen epic swarms show up on a couple of occasions on the Bow, which has the largest backswimmer species in Alberta, Notonecta borealis.