Wildlife Survey & Photo Service
Mayflies are primitive insects. All species are aquatic in the larval stage and short-lived as terrestrial adults. Mayflies are unique as they are the only insects that that have a fully-winged stage (subimago) before the sexually mature adult stage. They occur in most natural and artificial bodies of water. I found one species that appears to prefer cattle troughs.
Mayflies represent the primary basis for the sport of fly fishing and the art of fly tying.
Baetis tricaudatus nymph
Baetis is a widespread and diverse genus that is very important to anglers.
On the West Coast, Callibaetis is probably the most important mayfly in lakes and reservoirs. They are somewhat uncommon on rivers and streams, except at still water outflow where I find Callibaetis patterns quite effective.
Drunella coloradensis nymph.
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