Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This species was fairly abundant in a February sample of the upper Yakima.
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Giant Water Bug Species Belostoma flumineum (Electric Light Bugs)
Where & when
In 141 records from GBIF, adults of this species have mostly been collected during September (18%), August (15%), October (15%), July (13%), May (12%), and June (11%).
In 12 records from GBIF, this species has been collected at elevations ranging from 246 to 1083 ft, with an average (median) of 620 ft.
Specimens of the Giant Water Bug Species Belostoma flumineum
2 Adults
I'm glad I finally got one of these Belostoma water bugs under my good camera. I had been hoping to get one in my kick-net samples for a while with no luck, but I ended up finding this one drifting midstream just below the surface while I fished. I have frequently seen water scorpions do that, too, and I'm beginning to suspect that is a common situation travel for these large Hemiptera bugs, and perhaps the way trout are used to seeing them.
I haven't seen the imitation of these things stressed, but in August 2003 on one of my favorite rivers the largest brown trout I kept had stomachs full of these things.
Discussions of Belostoma flumineum
Anyone else find these to be important?
2 replies
Posted by Troutnut on Jul 26, 2006
Last reply on Oct 9, 2006 by GONZO
Back when I was just starting to learn to fly fish and still kept quite a few fish, I autopsied the stomachs of a couple 17-19 inch brown trout in August and found them packed with these Belostoma flumineum bugs.
I haven't tied a reasonable imitation yet, but if those fish (from a few miles apart on the same river) were so fond of them an imitation is probably a great idea. It would be good to figure out where and when these things are important.
None of the fly fishing literatue I've seen has dealt with them at all, except for mentioning their existence in passing.
I haven't tied a reasonable imitation yet, but if those fish (from a few miles apart on the same river) were so fond of them an imitation is probably a great idea. It would be good to figure out where and when these things are important.
None of the fly fishing literatue I've seen has dealt with them at all, except for mentioning their existence in passing.