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Caddisfly Genus Brachycentrus (Grannoms)

Taxonomic Navigation -?-
» Genus Brachycentrus (Grannoms)
Species in BrachycentrusNumber of SpecimensNumber of Pictures
Brachycentrus americanusAmerican Grannom11
Brachycentrus appalachiaApple Caddis330
Brachycentrus fuliginosusGrannom00
Brachycentrus lateralisStriped Grannom00
Brachycentrus nigrosomaGrannom00
Brachycentrus numerosusDark Grannom00
Brachycentrus occidentalisMother's Day Caddis00

7 species aren't included.
Common Name
MatchCommon Name
**Grannoms
Pictures Below ↓
This prolific genus includes the popular eastern early-season Apple Caddis and Grannom hatches. Their life cycles are ideal for the fly angler, and every stage is frequent trout prey.

Note that this species changes color dramatically after it emerges, and imitations of egg-laying adults should be a different color from imitations of emergers. Emergers have pale blonde, almost off-white wings and bright green bodies, while the egg-laying adults have light brownish gray wings and medium green bodies.

Hatching Behavior


Time Of Day (?): Usually afternoon

Most Brachycentrus species have very brief, very intense emergences on which trout feed steadily. Brachycentrus americanus is an exception, as its emergence may be more spread out.

The pupae are vulnerable to trout during their lengthy surface emergence.

Egg-Laying Behavior


Brachycentrus adult females land on and ride the water calmly to oviposit, so they are well-imitated with traditional tent-wing caddisfly patterns.

Larva & Pupa Biology


Diet: Algae, plankton

Shelter Type: Tapered wood cases of rectangular cross-section
Like many caddisflies, these larvae rappel between the rocks with a white silk anchor line. In Caddisflies, LaFontaine recommends imitating it by coloring the last eighteen inches of the leader white.

Special thanks to Lloyd Gonzales, author of the excellent new book Fly-Fishing Pressured Water, for helping to sort out the Brachycentrus species and common names.

Pictures of 5 Caddisfly Specimens in the Genus Brachycentrus:

Specimen Page:12
Brachycentrus appalachia (Apple Caddis) Caddisfly AdultBrachycentrus appalachia (Apple Caddis) Caddisfly Adult View 13 PicturesI captured this specimen in the same color as this photograph, during its egg-laying flight. The emergers are much lighter.
Collected May 13, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on May 18, 2007
Brachycentrus appalachia (Apple Caddis) Caddisfly AdultBrachycentrus appalachia (Apple Caddis) Caddisfly Adult View 5 Pictures
Collected May 7, 2005 from the Beaverkill River in New York
Added to Troutnut.com by Troutnut on May 16, 2006
Brachycentrus (Grannoms) Caddisfly PupaBrachycentrus (Grannoms) Caddisfly Pupa View 10 PicturesThe green blob contained in this case is a pupa in the early stages of transformation from larva to the final stage we generally picture and imitate. This specimen and several like it were fixed to a rock I picked up, and each one had the front of its case sealed off, protecting the helpless pupa from predation. It's neat to see the insect part-way through such a radical transformation.

It was very hard to extract this thing from its case, so there's a bit of extra goo near the head from where I accidentally punctured it.
Collected April 14, 2007 from Cayuta Creek in New York
Added to Troutnut.com by Troutnut on April 22, 2007
Specimen Page:12

2 Streamside Pictures of Brachycentrus Caddisflies:

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In this picture: Caddisfly Genus Brachycentrus (Grannoms). From the Neversink River in New York.


In this picture: Caddisfly Genus Brachycentrus (Grannoms).
StateNew York
LocationNeversink River
Date TakenMay 12, 2007
Date AddedJun 5, 2007
AuthorTroutnut
CameraPENTAX Optio WPi
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I'm not sure what these clusters of grannoms are doing lying dead and mostly upside down in clusters on the rocks. Anyone have an explanation? In this picture: Caddisfly Genus Brachycentrus (Grannoms). From the Neversink River in New York.
I'm not sure what these clusters of grannoms are doing lying dead and mostly upside down in clusters on the rocks. Anyone have an explanation?

In this picture: Caddisfly Genus Brachycentrus (Grannoms).
StateNew York
LocationNeversink River
Date TakenMay 12, 2007
Date AddedJun 5, 2007
AuthorTroutnut
CameraPENTAX Optio WPi

3 Underwater Pictures of Brachycentrus Caddisflies:

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This picture from below shows a stillborn Ephemerella subvaria (Hendrickson) dun drifting on the surface amidst a number of shed pupal skins from Brachycentrus caddisflies which were heavily hatching that day. In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Caddisfly Species Brachycentrus appalachia (Apple Caddis). From the East Branch of the Delaware River in New York.
This picture from below shows a stillborn (
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This stillborn Ephemerella subvaria dun is trapped in its shuck.
This stillborn Ephemerella subvaria dun is trapped in its shuck.
Stillborn: In fly fishing, a stillborn insect is one which got stuck in its nymphal or pupal shuck during emergence and floats helplessly on the surface instead of flying away. It is a specific class of cripple, although it is sometimes used interchangeably with that term.) Ephemerella subvaria (Hendrickson) dun drifting on the surface amidst a number of shed pupal skins from Brachycentrus caddisflies which were heavily hatching that day.

In this picture: Mayfly Species Ephemerella subvaria (Hendrickson) and Caddisfly Species Brachycentrus appalachia (Apple Caddis).
StateNew York
LocationEast Branch of the Delaware River
Date TakenApr 19, 2006
Date AddedApr 22, 2006
AuthorTroutnut
CameraPENTAX Optio WPi
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A Brachycentrus "Apple Caddis" pupa scoots around in the surface film. Apparently it had some difficulty emerging, so I was able to slip my camera underneath it and take a picture from below. In this picture: Caddisfly Species Brachycentrus appalachia (Apple Caddis). From the East Branch of the Delaware River in New York.
A Brachycentrus "Apple Caddis" pupa scoots around in the surface film. Apparently it had some difficulty emerging, so I was able to slip my camera underneath it and take a picture from below.

In this picture: Caddisfly Species Brachycentrus appalachia (Apple Caddis).
StateNew York
LocationEast Branch of the Delaware River
Date TakenApr 19, 2006
Date AddedApr 22, 2006
AuthorTroutnut
CameraPENTAX Optio WPi
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This Brachycentrus "Apple Caddis" struggled more than its kin in escaping its pupal skin, enabling me to take an underwater picture of it from directly below. This is sort of a trout's eye view, but I used the flash for the picture so the transparent shuck appears far brighter than it really is. In this picture: Caddisfly Species Brachycentrus appalachia (Apple Caddis). From the East Branch of the Delaware River in New York.
This Brachycentrus "Apple Caddis" struggled more than its kin in escaping its pupal skin, enabling me to take an underwater picture of it from directly below. This is sort of a trout's eye view, but I used the flash for the picture so the transparent shuck (
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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.) appears far brighter than it really is.

In this picture: Caddisfly Species Brachycentrus appalachia (Apple Caddis).
StateNew York
LocationEast Branch of the Delaware River
Date TakenApr 19, 2006
Date AddedApr 22, 2006
AuthorTroutnut
CameraPENTAX Optio WPi

Recent Discussions of Brachycentrus

grannom caddis 50 Replies »
Posted by Goose on Sep 26, 2006
Last reply on Jun 13, 2008 by Quillgordon
Hi All! I was reading through the site and I happened upon the Grannom (Apple) Caddis page, which made me wonder. Here in PA it is called The Mother's Day Caddis, I believe. Adults, which trout rarely feed on, are imitated with black or peacock herl bodies. The pupa, or emrgers I guess, we imitate with a wet fly. It has a peacock herl body and brown hackle for the legs, etc. in a size 14. Is this the same Grannon as the apple Grannom? Just curious!
I still get confused by these caddis and I'm trying to narrow down a list of caddis patterns and colors to cover the largest percentage of the hatches throughout the year.
ReplyWhat's happening here? 5 Replies »
Posted by Troutnut on Jun 5, 2007
Last reply on Jun 6, 2007 by Troutnut
Check out the two streamside pictures on my Brachycentrus page. I found these clusters of dead grannoms in a few different spots along a Catskill river on May 12th, while many members of (seemingly) the same species were in the air laying eggs and occasionally falling spent and being eaten by trout.

Have you ever seen these clusters? What's the explanation?
Reply
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