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Mayfly Family Baetidae (Blue-Winged Olives)

Pictures Below
"These little critters supplant the importance of many other well-known mayfly hatches."

-Fred Arbona in Mayflies, the Angler, and the Trout


Arbona did not overestimate these critters. Their great numbers and multiple broods each season make up for their size, which is rarely larger than size 16 and often smaller than size 20.

Hardly mentioned in angling literature prior to the middle of the last century, baetids have become increasingly important to anglers, rivaling any other family of mayflies in this regard. This is largely due to the extension of fishing seasons that now include the early and late periods when this familyís species usually dominate hatching activity. Another important reason is the tremendous improvement in tackle allowing more practical imitation of these little mayflies. The dramatic ecological changes in many of our watersheds and the subsequent impact this has had on the makeup of taxa populations is also a factor.

Taxonomically speaking, this is a most unruly family. The entomological community seems to be perpetually reclassifying its genera and species to the chagrin of many anglers. These changes are not capricious. The reason is older nomenclatures haven't provided the taxonomic flexibility required as more becomes known about the complexities of baetid relationships. Classification of this familyís genera and species is very much a work in progress. The changes have been so extensive that it is beyond the scope of this hatch page to track the taxonomic history effectively without interjecting even more confusion. If you are frustrated by the inability to find some of the old familiar names, you're not alone. Rest assured these popular hatches are listed here, just under the latest classifications. The old famous names are referenced in their hatch pages.

Common baetid hatches with a national distribution are the species Acentrella turbida, Baetis brunneicolor, and Baetis tricaudatus. In the West, Baetis bicaudatus, Diphetor hageni and Plauditus punctiventris can also be common. In the East and the Midwest, look for Baetis intercalaris and Plauditus dubius. The species Iswaeon anoka is important in both the West and Midwest. Some of the Procloeon and Anafroptilum (prev. Centroptilum) species are coming to the increasing notice of anglers across the country.

Stillwater anglers are likely to run across Callibaetis ferrugineus ferrugineus in the East and Midwest. Western anglers will find Callibaetis californicus and Callibaetis ferrugineus hageni to be very important.

Streamside identification of these mayflies to specific and often even generic level has always been difficult. This is now even more so as new taxonomic evidence has shown hind wing conformation (or lack of hind wings) and other features are less dependable as ways to tell the genera apart. Many of the lesser-known species probably produce excellent local hatches but have not caught enough attention to be properly recognized by anglers. The lesson is that we should not assume anything about the identity of many Baetidae hatches we come across; they may not even be in the Baetis genus, let alone familiar species.

Hatching Behavior


The Baetidae mayflies are so important, in part, because their life cycles include several points of unusually high vulnerability to trout. They emerge on the surface, and the nymphs may drift just under it for a while before breaking through. They have trouble escaping their shucks (
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Shuck: The shed exoskeleton left over when an insect molts into its next stage or instar. Most often it describes the last nymphal or pupal skin exited during emergence into a winged adult.
)
in the film, taking a long time and often becoming stuck in the process. Those which do escape may ride the water for quite a distance before taking flight.

Nymph Biology


The fast-swimming Baetidae nymphs are an important trout food even during non-hatch periods. The popular Pheasant Tail Nymph pattern, in small sizes, imitates them fairly well.

Pictures of 77 Mayfly Specimens in the Family Baetidae:

Specimen Page:1234...9
Female Baetis (Blue-Winged Olives) Mayfly DunFemale Baetis (Blue-Winged Olives) Mayfly Dun View 7 PicturesThis little early-season dun molted into this spinner after I photographed her.
Collected April 19, 2006 from Mongaup Creek in New York
Added to Troutnut.com by Troutnut on April 21, 2006
Male Baetis (Blue-Winged Olives) Mayfly DunMale Baetis (Blue-Winged Olives) Mayfly Dun View 14 PicturesThis dun molted most of the way into a spinner (though the wings got stuck) the evening after I photographed it, so I took some more photos of the spinner.

I found a female nearby, probably of the same species.
Collected September 19, 2006 from Mystery Creek #43 in New York
Added to Troutnut.com by Troutnut on October 4, 2006
Specimen Page:1234...9

5 Streamside Pictures of Baetidae Mayflies:

Streamside Photo Page:12
Often mayflies can be found on houses near the river.  This one molted from a dun into a spinner on the outside of our kitchen window.

Any lit dwelling near the river can attract a lot of mayflies at night.  A good way to determine what's hatching is to visit a gas station (or anything else with bright lights) close to the river early in the morning.  In this picture: Mayfly Family Baetidae (Blue-Winged Olives). From the West Fork of the Chippewa River in Wisconsin.
Often mayflies can be found on houses near the river. This one molted from a dun into a spinner on the outside of our kitchen window.

Any lit dwelling near the river can attract a lot of mayflies at night. A good way to determine what's hatching is to visit a gas station (or anything else with bright lights) close to the river early in the morning.

In this picture: Mayfly Family Baetidae (Blue-Winged Olives).
Date TakenMay 26, 2005
Date AddedFeb 8, 2006
AuthorTroutnut
In this picture: Mayfly Family Baetidae (Blue-Winged Olives). From Byers Creek in Alaska.
StateAlaska
LocationByers Creek
Date TakenJul 10, 2012
Date AddedJul 14, 2012
AuthorTroutnut
CameraCanon PowerShot D10
Hanging on!  In this picture: Mayfly Family Baetidae (Blue-Winged Olives). From Byers Creek in Alaska.
Hanging on!

In this picture: Mayfly Family Baetidae (Blue-Winged Olives).
StateAlaska
LocationByers Creek
Date TakenJul 10, 2012
Date AddedJul 14, 2012
AuthorTroutnut
CameraCanon PowerShot D10
Streamside Photo Page:12

10 Underwater Pictures of Baetidae Mayflies:

Underwater Photo Page:12
Several Baetidae nymphs line up on a rock.  In this picture: Mayfly Family Baetidae (Blue-Winged Olives). From Mongaup Creek in New York.
Several Baetidae nymphs line up on a rock.

In this picture: Mayfly Family Baetidae (Blue-Winged Olives).
Date TakenApr 19, 2006
Date AddedApr 22, 2006
AuthorTroutnut
CameraPENTAX Optio WPi
This is my favorite underwater picture so far. It shows a bunch of Simuliidae (black fly) larvae clinging to a rock and swinging in the fast current. There are also at least four visible mayfly nymphs, probably in the family Baetidae.  In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and True Fly Family Simuliidae (Black Flies). From Eighteenmile Creek in Wisconsin.
This is my favorite underwater picture so far. It shows a bunch of Simuliidae (black fly) larvae clinging to a rock and swinging in the fast current. There are also at least four visible mayfly nymphs, probably in the family Baetidae.

In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and True Fly Family Simuliidae (Black Flies).
Date TakenMar 19, 2004
Date AddedJan 25, 2006
AuthorTroutnut
There are several mayfly and stonefly nymphs clinging to this log.  In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and Stonefly Family Taeniopterygidae (Willowflies). From Eighteenmile Creek in Wisconsin.
There are several mayfly and stonefly nymphs clinging to this log.

In this picture: Mayfly Family Baetidae (Blue-Winged Olives) and Stonefly Family Taeniopterygidae (Willowflies).
Date TakenMar 19, 2004
Date AddedJan 25, 2006
AuthorTroutnut
Underwater Photo Page:12

Recent Discussions of Baetidae

Big Green River, Wisconsin, late September 1 Reply »
Posted by Admiralb on Sep 28, 2013 in the species Baetis brunneicolor
Last reply on Sep 30, 2013 by Entoman
I hosted two visiting delegates to the T.U. National Convention in Madison, WI. on September 25, 2013, taking them to the Big Green River in Grant County near Fennimore. There was a high overcast in the morning, and these mayflies [which I merely called "BWO's" and imitated with #16 parachute dries - thin olive bodies, gray wing posts and dun parachute hackle] - were active. Both of my guests raised browns fishing a gray nymph behind a #16 parachute dry BWO. As long as my flies catch fish, I don't need to be a detailed entomologist. Nevertheless, I do sincerely appreciate the detailed scientific info, because it helps me focus my flytying and fly selection. Thank you.
ReplyInstant Baetid Nymph Patterns 36 Replies »
Posted by PaulRoberts on Feb 1, 2012
Last reply on Mar 7, 2013 by PaulRoberts
Often the first fishing for bug-eaters I do every year is the early Baetis activity. ThenÖthe Baetid activity just continues through the year on virtually all the waters I fish. This is probably so for you all too.

I often fish a Baetid dry ahead of a Baetid nymph, since individual fish could be targeting either. I fish the #18 or #20 nymph on a short (~18-24Ē) length of 7x to the bend of the hook of a #16 Parachute dry. A tiny daub of tungsten putty helps the short fine dropper break the surface film, as itís critical to have the dropper line as straight as possible as soon as possible so I can detect every take. I use this combination all year and it's even a smart prospecting rig on waters calm enough to see the small dry.

For my bread-n-butter recipes I can be a pretty lazy tier, so I want as close to an instant tie as I can get. The following are two ~4 minute recipes:

Parafilm Baetid:
This pattern uses a single section of mallard flank barbs (tinted ahead of time with a swipe of a permanent marker) for both the tail and the legs, using the tips for the tail and the butts for the legs. Parafilm (laboratory thermo-plastic film) is used for the body, and tinted with permanent markers. The Parafilm body makes the fly sink a little quicker than dubbed ones, esp with a heavy iron (like the 3906 in this pic).

Itís important to me to have the fly drift correctly in the water, not flip upside down. So it needs an ample tail to right the hook when itís tethered. Also, with the Parafilm body it helps to adjust the legs with thread so they angle upwards, so they are above the central plane of the fly. I take the most time on this fly with the legs so they are equal on each side in number, length, thickness, and orientation. No need to be anatomically correct so two legs to a side is enough to suggest legs. I suspect the upside down or rolling flies affect my catch rate, as Iíve had repeated refusals to such flies and then made good by tying on a fresh one.


(User-posted images are only viewable in the forum section.)

(Yeah, I know there are 4 legs on the left side -I snipped off #3 after I noticed.)


(User-posted images are only viewable in the forum section.)


Baetid #2:
The second pattern is similar to a combination of the ďWD40Ē and "Kimball's Emerger", except that it doesnít bother with the wingcase. The wingcase is suggested with permanent markers: a spot of dark brown behind the head, and two black wing-buds. Again the tinted duck flank for tail and legs, then olive thread for the abdomen, a pale pinkish-golden dubbing for the thorax. Legs equal again, but not so critical that they ride well above the central (dorsal/ventral) plane, as the dubbing adds some buoyancy. The legs should not hang below the plane or the fly will likely ride upside down.


(User-posted images are only viewable in the forum section.)



(User-posted images are only viewable in the forum section.)



(User-posted images are only viewable in the forum section.)


{EDIT}: Just noticed this fly has the wingcase, but I usually just omit it.

I tie a few others too, but these cover the dropper nymph deal pretty well for me.

What Baetid nymph patterns do you rely on?
ReplyNorth Country Spiders for Baetids 27 Replies »
Posted by Entoman on Oct 25, 2011
Last reply on Feb 16, 2012 by Softhackle
I wanted to share a couple of patterns that have proven very successful over the years (and the last several weeks in particular) when baetids are about. They hale from England where they have been popular for a very long time. Their construction is simple - silk thread, a wing covert or shoulder hackle, bee's wax, and maybe the merest smidgen of natural dubbing on a few of them. No plastic flash, no head cement, just natural materials delicately applied. There's something very elegant in their understated appearance, and boy do they work! Their thin bodies and sparseness ape the baetids perfectly and the hook set is enhanced as well.

Fished dead drift or under a controlled swing with the rod elevated, they can be deadly when the small stuff is awash in the drift. The two patterns below are the Waterhen Bloa and the Snipe & Purple both in the class of wet flies called North Country Spiders. I find them especially valuable for fishing during baetid spinner activity on freestone rivers in the moderate to slow current sections. They also work fishing "under" the hatch of duns. I never know which one they will prefer, nor have I found any increase in catch rate by doubling up on the one they do for that day, so I just tie 'em both on and leave it be.

Size 16 Waterhen Bloa

(User-posted images are only viewable in the forum section.)



Size 18 Snipe & Purple

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ReplyI like this 2 Replies »
Posted by Jawajohn on Jan 26, 2012
Last reply on Jan 27, 2012 by Martinlf
Rosenbauers rabbit foot emerger on vimeo
Replyacentrella nymph 20 Replies »
Posted by Goose on Nov 3, 2006 in the genus Acentrella
Last reply on Sep 3, 2011 by Oldredbarn
Hi Jason! Do you have a picture of the (acentrella-miniature BWO nymph) on the site? I've been fishing them and wanted a better idea of how they look.
Thanks,
Bruce
Reply
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