This common name refers to only one species. Click its scientific name to learn more.
Baetis tricaudatus is undeniably the most widespread and abundant baetid on the continent and arguably the most important mayfly species to trout and anglers alike. Eastern anglers used to know these important mayflies by the storied name of
Baetis vagans. Conversely, the usually much larger and late Fall hatching brood of
Baetis tricaudatus was considered an important Western species with its own tradition. But, entomologists recently determined that they are both in fact the same species. The nomenclature conventions guiding entomologists do not account for a name's regional fame among fishermen, and new or obscure species names may replace their old favorites. Sometimes taxa with disparate traditions are combined.
Baetis vagans is one such casualty. Fortunately, trout think like Shakespeare:
A rose by any other name would smell as sweet. The rose that was
vagans has lost none of its charm. This species is
multibrooded with the hatches of Spring being larger flies. As the weather warms the following broods are composed of progressively smaller flies. In the East, they range in size from 16 to 20. In the West, they may run a size larger.