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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 |