Cascades to Coast

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What is the largest predatory freshwater macroinvertebrate?

One of the largest predatory freshwater macroinvertebrate in the northwest is the giant water bug (Belostomatidae). Giant water bugs are commonly found in pond and streams, but I know of one collected in a large slow-moving river. The largest predatory stream insect is the golden stonefly (Perlidae). But an even bigger stream insect is the pacific giant (Pteronarcyidae). The pacific giant is a shredder. Shredders eat leaves that fall into the stream. See links below for more information about aquatic macroinvertebrates.

http://en.wikipedia.org/wiki/Belostomatidae
http://en.wikipedia.org/wiki/Perlidae
http://en.wikipedia.org/wiki/Pteronarcyidae