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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.

Mayfly Species Baetisca obesa (Armored Mayfly)

I have no experience with important fishing to this species, but it is probably the Baetisca species that Ernest Schwiebert discussed in Nymphs as locally abundant on one stretch of a Catskill river.

See the Baetisca genus page for more details.

Where & when

This is the most common species of Baetisca in the East. Its official range extends into the Midwest, but populations there are overshadowed by the more prolific Baetisca laurentina.

Specimens of the Mayfly Species Baetisca obesa

2 Nymphs
1 Female Dun
Female Baetisca obesa (Armored Mayfly) Mayfly Dun
This Baetisca obesa dun hatched out in my aquarium from nymphs collected a couple weeks earlier.

Recent Discussions of Baetisca obesa

Similiar found in Minnesota
1 replies
Posted by PRohlfsen on May 11, 2007
Last reply on May 11, 2007 by Troutnut
I was fishing the Vermillion River in Minnesota south of the metro area and found a nymph similar to the Armored Mayfly Nymph. It did appear to be much more green in color. It was moving through a really muddy part of the stream, which I found interesting.

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