out of caddisfly, stonefly and mayfly wich (or all) filter the water for their food?
out of the 3 caddis fly may fly and stone fly wich one(s) filter water for their food?
Caddis flies are bottom grazers:
http://www.fcps.k12.va.us/StratfordLandingES/Ecology/mpages/northern_caddis_fly.htm
http://insects.tamu.edu/fieldguide/cimg245.html
although the Wikipedia article indicates that some might be considered filter feeders:
http://en.wikipedia.org/wiki/Caddis_Fly
Mayfly larvae mostly feed on algae, although there are apparently some predacious variants:
http://en.wikipedia.org/wiki/Mayfly
http://insects.tamu.edu/fieldguide/aimg3.html
Stonefly larvae are also bottom grazers:
http://www.bcadventure.com/adventure/angling/bugs/stonefly/stonefly.phtml
and this article indicates that some are predatory, while others are detritivores:
http://insects.tamu.edu/fieldguide/aimg32.html
So, I think your best answer would be the Caddisfly
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