Michigan Trout Streams Emergence Schedule

Compiled by John J.P. Long for The Challenge Chapter - Trout Unlimited
"X" Denotes Peak Period

 

SIZE NAME

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

18/20
Allocapnia granulata or vivipara
Tiny Early Winter Black Stonefly

****

****

****
               

16/20
Nemouridae and Leuctridae
Tiny Late Winter Black Stonefly
 

*

****

****
             

10/14
Taeniopteryx nivalis
Early Black Stonefly
 

*

****

****
             

12/14
Brachyptera fasciata
Early Brown Stonefly
   

**

****
*            

18/20
Baetis vagans
Blue Wing Olive Mayfly
     

***

X***

*XX*

****
***      

16/18
Paraleptophlebia adoptiva
Slate Wing Mahogony Mayfly
     

**

XX**

****
         

12/14
Ephemerella subvaria
Dark Hendrickson Mayfly
     

**

XX*            

16/18
Chimarra aterrima
Little Black Caddis
     

**

XX**

****

****

****
     

12/14
Leptophlebia cupida
Borcher's Drake Mayfly
     

*

****

****

****
**      

14/16
Brachycentrus americanus
Grannom Caddis
     

*

****

****

****
       

2/8
Pteronarcys dorsata
Midwestern Salmon Fly Stonefly
     

*

****

****
**        

10/18
Rhyacophilidae fenestra
Green Rock Worm Caddis
       

****

****
         

8/14
Perlodidae lsogenus and lsoperla
Medium Brown Stonefly
       

****

****

****
       

10/14
Siphloplecton basale
Great Speckled Olive Mayfly
       

*XX

****
**        

14/20
Hydropsyche bronta and simulans
Net Building Caddis
       

***

****

****

****

****

****
 

16/18
Ephemerella dorothea
Sulphur Dun Mayfly
       

**

XXX*
*        

14/18
Alloperla caudata and imbecilla
Little Yellow and Little Green Stonefly
       

**

****

****

****

****

****
 

14/16
Nectopsyche
White Miller Caddis
       

**

****

****

****

****

****
 

20/22
Baetis cingulatus
Blue Wing Olive Mayfly
       

**

****

****

****
     

14/16
Ephemerella invaria
True Hendrickson Mayfly
       

*X

X***
***        

14/16
Ephemerella rotunda
Light Hendrickson Mayfly
       

**

***
         

10/12
Stenonema vicarium
American March Brown Mayfly
       

**

****
**        

12/14
Stenonema fuscum
Sand Drake Mayfly
       

*

XX**
**        

12/14
Siphlonurus rapidus
Early Gray Drake Mayfly
       

*

X**          

10/12
Ephemera simulans
Brown Drake Mayfly
       

*

XX**
*        

8/10
Phryganlidae ptilostomis
Great Orange Sedge Caddis
         

****

****
       

8/12
Green Oak Worm/Greenie Worm
Caterpiller
         

*XX*
*        

20/28
Diptera
Midges
         

****

****

****

****

****
 

10/12
Isonychia sadleri
Mahogany Dun Mayfly
         

**X

XX**
       

6/8
Hexagenia limbata
Great Olive Winged Drake Mayfly
         

**X

X**        

10/12
Isonycha bicolor
White Gloved Howdy Mayfly
         

***

****

****
***    

12/14
Stenonema canadense
Light Cahill Mayfly
         

**

****
*      

10/12
Sephlonurus alternatus
Late Gray Drake Mayfly
         

**

XX**
       

10/12
Ephemera varia
Golden Drake Mayfly
         

**

****
*      

6/8
Paragentina media
Big Golden Stonefly
         

*

****
*      

14/18
Ephemerella lata
Slate Winged Olive Mayfly
         

*

****
***      

22/24
Pseudocloen anoka
Tiny Blue Winged Olive Mayfly
         

*

****

****

****
   

18/20
Ephemerella simplex
Dark Slate Wing Olive Mayfly
         

*

****

****

****
   

8/24
Terrestrials
Ants/Grasshoppers/Beetles/Jasids
         

*

****

****

****

****
 

24/26
Tricorythodes stygiatus
Tiny White Wing Black Mayfly
           

***

****

****

****
 

16/18
Paraleptophlebia debilis
Small Slate Mahogany Dun Mayfly
           

*

****

****

****
 

18/20
Mystocides sepulchralis
Black Dancer Caddisfly
             

****

****
   

22/24
Baetis pygmalus
Little Medium Olive Mayfl
y
             

***

****
   

12/14
Ephoron album
White Fly Mayfly
             

**

****
   

14/16
Baetis heimalis
Slate Wing Brown Mayfly
               

****

****
 

Challenge Chapter, Trout Unlimited.