For more information on the hatches please purchase The Hatches Made Simple, Arizona Trout Streams, Pennsylvania Trout Streams, or Fishing Limestone Streams by clicking on “Books” at the bottom of this page.
|
Common Name of the dun, stonefly (S) or caddisfly (C) |
Region Found |
Hatch |
Scientific Name |
Time of day |
Pattern |
Where in the stream the nymph changes to dun |
Type of water nymph inhabits |
|
Little Black Stonefly-S |
E, M & W |
February 1 |
Capnia vernalis |
Afternoon |
14-18 |
O |
M&F |
|
Little Olive Dun (Trico) |
W |
February 15**+ |
Tricorythodes fictus |
Morning |
20-24 |
S or B |
S |
|
Western March Brown |
W |
February 25* |
Rhithrogena morrisoni |
Afternoon |
14 |
T |
M & F |
|
Little Blue-Winged Olive Dun |
E, M&W |
January to December ** |
Baetis intercalaris |
Afternoon |
20 |
B |
M&F |
|
Little Golden Stonefly-S |
W |
April 1 |
Skawala parallela |
Afternoon |
16 |
O |
F |
|
Little Blue-Winged Olive Dun |
E, M &W |
April 1 |
Baetis tricaudatus** |
Afternoon |
20 |
B |
M&F |
|
Speckle-Winged Dun |
E & M |
April 10 |
Callibaetis skokianis** |
Morning & |
14 |
B |
S (prefers alkaline lakes) |
|
Early Brown Stonefly-S |
E&M |
April 10 |
Strophopteryx faciata |
Afternoon |
12-14 |
O |
M&F |
|
E & M |
April 15 |
Paralepto-phlebia adoptiva |
Afternoon |
18 |
S |
A |
|
|
Quill Gordon |
E |
April 15*** |
Epeorus pleruralis |
Afternoon |
14 |
B |
F |
|
Blue Quill |
W |
April 15 |
Paraleptophlebia memorialis |
Morning |
18 |
S |
A |
|
Dark Quill Gordon |
E & M |
April 18 |
Ameletus ludens |
Afternoon |
12 |
S, O |
M&F |
|
Dark Olive Dun |
E, M & L |
April 20 |
Siphloplecton basale |
Early afternoon |
12 |
T |
S & M |
|
Little Black Caddis-C |
E&M |
April 20 |
Chimarra atterima |
Afternoon |
14 |
B |
F |
|
Male: Red Quill |
E&M |
April 20 |
Ephemerella subvaria |
Afternoon |
14-16 |
B |
A |
|
Black Quill |
E&M |
April 22 |
Leptophlebia cupida |
Afternoon |
12 |
S |
S |
|
Grannom-C |
E & M |
April 22 |
Brachycentrus fulliginosis |
Afternoon |
12-16 |
B |
S &M |
|
Grannom-C |
E |
April 22 |
Brachycentrus numerosis |
Afternoon |
12-14 |
B |
S&M |
|
Quill Gordon |
W |
April, May & June |
Epeorus longimanus |
Afternoon |
14-16 |
B |
M&F |
|
Speckle-Winged Dun |
W |
May 1 |
Callibaetis americanus** |
Morning & |
14 |
T |
S (prefers alkaline lakes) |
|
Mother’s Day Caddis-C |
W |
May 1 |
Brachycentrus occidentalis |
Afternoon |
14-16 |
B |
S&M |
|
Light Stonefly-S |
May 8 |
Isoperla signata |
Afternoon |
12 |
O |
F |
|
|
Sulphur |
E&M |
Ephemerella invaria |
Evening |
15 |
T & M |
M&F |
|
|
Green Caddis-C |
E&M |
May 8 |
Rhyacophilia lobifera |
Afternoon |
14 |
B |
F |
|
Little Blue-Winged Olive Dun |
W |
May 10 |
Baetis brunneicolor |
Afternoon |
20 |
B |
A |
|
Western Green Drake |
W |
May 20 |
Drunella grandis |
Morning |
10-12 |
B |
M |
|
Little Blue-Winged Olive Dun |
May 20 |
Baetis bicaudatus |
Afternoon |
20 |
B |
A |
|
|
Salmon Fly-S |
W |
May 20 |
Pteronarcys californica |
Morning |
8 |
O |
F |
|
Pale Morning Dun |
W & A |
May 20 |
Ephemerella
excrucians |
Morning, |
16 |
T & M |
A |
|
Pale Evening Dun |
E&M |
May 18 |
Ephemerella septentrionalis |
Evening |
14-16 |
B |
F&M |
|
Pale Morning Dun |
W |
May 20 |
Ephemerella dorothea infrequens |
Morning |
18 |
T & M |
M |
|
American March Brown |
E&M |
May 20 |
Maccaffertium vicarium |
Afternoon |
12 |
T |
F&M |
|
Pale Evening Dun |
E |
May 20 |
Leucrocuta aphrodite |
Evening |
16 |
T |
F |
|
Chocolate Dun |
E&M |
May 22 |
Eurylophella bicolor |
Dun: Afternoon |
16-18 |
B |
M |
|
Spotted Sedge-C |
E&M |
May 23 |
Symphito-psyche slossanae |
Afternoon |
14 |
B |
M&F |
|
Light Cahill |
E |
May 25 |
Maccaffertium ithaca |
Evening |
14 |
T |
M&F |
|
Slate Drake |
E&M |
May 25** |
Isonychia bicolor |
Evening |
12 |
S |
M&F |
|
Female: Pink Cahill |
E&M |
May 25** |
Epeorus vitreus |
Evening |
14 |
B |
M&F |
|
Light Cahill |
E&M |
May 25 |
Stenacron |
Evening |
12-14 |
T |
M&F |
|
Dark Green Drake |
E&M |
May 25 |
Litobrancha |
Dun: Afternoon |
10 |
T |
S |
|
Brown Drake |
E,M,W & L |
May 24 |
Ephemera simulans |
Evening |
10-12 |
T |
S&M |
|
Green Drake |
E |
May 24 |
Ephemera guttulata |
Evening |
8-10 |
T |
S&M |
|
Gray Drake |
E&M |
May 24 |
Siphlonurus |
Dun: Day |
12-14 |
S |
S |
|
Blue-Winged Olive Dun |
E&M |
May 25 |
Drunella lata (was cornuta) |
Dun: Morning |
B |
A |
|
|
Blue Quill |
E&M |
May 26 |
Paraleptophlebia mollis |
Morning & |
18 |
S |
A |
|
Male: Chocolate Dun |
E&M |
May 30 |
Ephemerella needhami |
Dun: Morning |
16 |
T |
M |
|
Pale Evening Dun |
E&M |
May 31 |
Ephemerella dorothea dorothea |
Evening |
18 |
T & M |
M |
|
Dark Blue Sedge-C |
June 1 |
Psilotreta frontalis |
Evening |
14 |
B |
||
|
Golden Stonefly-S |
W |
June 1 |
Calineuria californica |
Morning |
8 |
O |
F |
|
Blue-Winged Olive Dun |
E&M |
June 10 |
Drunella lata |
Dun: Morning |
16 |
B |
M |
|
Yellow Drake |
E & M |
June 15 |
Ephemera varia |
Evening |
12 |
T |
S |
|
Green Drake |
E, M & L |
June 15 |
Hexagenia rigida |
Evening |
10 |
T |
S |
|
Pale Evening Dun |
W |
Heptagenia elegantula |
Evening |
14 |
T |
S&M |
|
|
Blue-Winged Olive Dun |
W |
June 15 |
Drunella flavilinea |
Morning & |
14 |
B |
M&F |
|
Blue-Winged Olive Dun |
E&M |
June 15 |
Danella simplex |
Dun: Morning |
20 |
B |
M |
|
Light Cahill |
E&M |
June 15 |
Heptagenia |
Evening |
12 |
T |
M&F |
|
Cream Cahill |
Maccaffertium pulchellum |
Evening |
14 |
R |
M&F |
||
|
Dark brown Dun |
W |
June 15 |
Diphetor hageni |
Morning & |
20 |
B |
M |
|
Light Cahill |
W |
June 15 |
Cinygma dimicki |
Evening |
12 |
T |
S & M |
|
Pale Evening Dun |
E&M |
June 22 |
Leucrocuta hebe |
Evening |
16 |
R |
M&F |
|
Blue Quill |
E&M |
June 25 |
Paraleptophbia guttata |
Morning & |
18 |
F |
A |
|
Golden Drake |
E |
June 25 |
Anthopota-manthus distinctus |
Evening |
12 |
B |
S&M |
|
Quill Gordon |
W |
June 25 |
Rhithrogena futilis & R. undulate |
Morning & |
12 |
T |
F |
|
Pink Lady |
W |
June 25 |
Epeorus albertae |
Evening |
12 |
B |
M |
|
Little Olive Dun (Trico) |
E&M |
July 1 |
Tricorythodes allectus (attratus) |
Morning |
24 |
S or B |
S |
|
Little Olive Dun (Trico) |
E&M |
July 1 |
Tricorythodes stygiatus |
Morning |
24 |
S or B |
S |
|
Gray Drake |
W |
July 1 |
Siphlonurus occidentalis |
Afternoon |
12 |
S |
S |
|
Little Olive Dun(Trico) |
W |
July 1 |
Tricorythodes minutus & others |
Morning |
24 |
S or B |
S |
|
Gray Fox |
W |
July 1 |
Heptagenia solitaria |
Evening |
14 |
T |
F & M |
|
Cream Cahill |
August 1 |
Maccaffertiummodestum |
Evening |
14-16 |
T |
M&F |
|
|
White Fly |
E&M |
August 12 |
Ephoron leukon |
Evening |
14 |
T |
M |
|
Big Slate Drake |
E&M |
August 15 |
Hexagenia atrocaudata |
Evening |
8 |
T |
S |
|
White Fly |
W |
August 15 |
Ephoron album |
Evening |
14 |
T |
M |
|
Little Blue-Winged Olive Dun |
E, M & W |
Baetis tricaudatus |
Dun: Afternoon |
20-22 |
B |
A |
|
|
Little Blue-Winged Olive Dun |
E, M & W |
Plauditus veteris |
Afternoon |
20 |
B |
A |
|
|
Slate Drake |
E&M |
September 1** |
Isonychia bicolor |
Afternoon & |
14 |
S |
F |
|
Autumn Sedge |
E&M |
September 15 |
Neophyla species |
Afternoon |
12 |
B |
F |
* Later on inland waters
** More than one generation per year
*** Hatches can appear into June
**** Often the small generation is a size smaller
+ Appears in February in the Southwest (Arizona)
For more information on the hatches please purchase The Hatches Made Simple, Arizona Trout Streams, Pennsylvania Trout Streams, or Fishing Limestone Streams by clicking on “Books” at the bottom of this page.
M=Midwest
Key to “Where the nymph changes to a dun”
S= Swims to shore or an exposed rock
B= changes from nymph to dun near the bottom
T= changes from nymph to dun near the surface
M= changes near the middle depth of the stream or lakes
O= often changes out of the stream on a rock or a bridge
Type of water nymph inhabits
S=Slow
M=Moderate
F-Fast
A=All types
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