Hatch Chart

Michigan Trout Streams Emergence Schedule

Compiled by John J.P. Long for The Challenge Chapter - Trout Unlimited

"X" Denotes Peak Period
NAME SIZE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV
Allocapnia granulata or vivipara
Tiny Early Winter Black Stonefly
18/20 **** **** ****                
Nemouridae and Leuctridae
Tiny Late Winter Black Stonefly
16/20   * **** ****              
Taeniopteryx nivalis
Early Black Stonefly
10/14   * **** ****              
Brachyptera fasciata
Early Brown Stonefly
12/14     ** **** *            
Baetis vagans
Blue Wing Olive Mayfly
18/20       *** X*** *XX* **** ***      
Paraleptophlebia adoptiva
Slate Wing Mahogony Mayfly
16/18       ** XX** ****          
Ephemerella subvaria
Dark Hendrickson Mayfly
12/14       ** XX*            
Chimarra aterrima
Little Black Caddis
16/18       ** XX** **** **** ****      
Leptophlebia cupida
Borcher's Drake Mayfly
12/14       * **** **** **** **      
Brachycentrus americanus
Grannom Caddis
14/16       * **** **** ****        
SIZE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV
Pteronarcys dorsata
Midwestern Salmon Fly Stonefly
2/8       * **** **** **        
Rhyacophilidae fenestra
Green Rock Worm Caddis
10/18         **** ****          
Perlodidae lsogenus and lsoperla
Medium Brown Stonefly
8/14         **** **** ****        
Siphloplecton basale
Great Speckled Olive Mayfly
10/14         *XX **** **        
Hydropsyche bronta and simulans
Net Building Caddis
14/20         *** **** **** **** **** ****  
Ephemerella dorothea
Sulphur Dun Mayfly
16/18         ** XXX* *        
Alloperla caudata and imbecilla
Little Yellow and Little Green Stonefly
14/18         ** **** **** **** **** ****  
Nectopsyche
White Miller Caddis
14/16         ** **** **** **** **** ****  
Baetis cingulatus
Blue Wing Olive Mayfly
20/22         ** **** **** ****      
Ephemerella invaria
True Hendrickson Mayfly
14/16         *X X*** ***        
SIZE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV
Ephemerella rotunda
Light Hendrickson Mayfly
14/16         ** ***          
Stenonema vicarium
American March Brown Mayfly
10/12         ** **** **        
Stenonema fuscum
Sand Drake Mayfly
12/14         * XX** **        
Siphlonurus rapidus
Early Gray Drake Mayfly
12/14         * X**          
Ephemera simulans
Brown Drake Mayfly
10/12         * XX** *        
Phryganlidae ptilostomis
Great Orange Sedge Caddis
8/10           **** ****        
Green Oak Worm/Greenie Worm
Caterpiller
8/12           *XX* *        
Diptera
Midges
20/28           **** **** **** **** ****  
Isonychia sadleri
Mahogany Dun Mayfly
10/12           **X XX**        
Hexagenia limbata
Great Olive Winged Drake Mayfly
6/8           **X X**        
SIZE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV
Isonycha bicolor
White Gloved Howdy Mayfly
10/12           *** **** **** ***    
Stenonema canadense
Light Cahill Mayfly
12/14           ** **** *      
Sephlonurus alternatus
Late Gray Drake Mayfly
10/12           ** XX**        
Ephemera varia
Golden Drake Mayfly
10/12           ** **** *      
Paragentina media
Big Golden Stonefly
6/8           * **** *      
Ephemerella lata
Slate Winged Olive Mayfly
14/18           * **** ***      
Pseudocloen anoka
Tiny Blue Winged Olive Mayfly
22/24           * **** **** ****    
Ephemerella simplex
Dark Slate Wing Olive Mayfly
18/20           * **** **** ****    
Terrestrials
Ants/Grasshoppers/Beetles/Jasids
8/24           * **** **** **** ****  
Tricorythodes stygiatus
Tiny White Wing Black Mayfly
24/26             *** **** **** ****  
SIZE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV
Paraleptophlebia debilis
Small Slate Mahogany Dun Mayfly
16/18             * **** **** ****  
Mystocides sepulchralis
Black Dancer Caddisfly
18/20               **** ****    
Baetis pygmalus
Little Medium Olive Mayfly
22/24               *** ****    
Ephoron album
White Fly Mayfly
12/14               ** ****    
Baetis heimalis
Slate Wing Brown Mayfly
14/16                 **** ****  
SIZE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV