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Hatch Chart

  

Imitation

Copies

Dates

Time

Size

Location

Western March Brown

Rhithrogena morrisoni

Mar-Jun

P.M.

14

E

Little Black Stonefly

Capnia vernalis

Mar.

A.M./P.M.

18

E,M,

Little Blue Winged Olive Dun

Baetis tricaudatus

April*

A.M./P.M.

20

All

Blue Quill

Paraleptophlebia

adoptiva

Mid April-Mid May

A.M./P.M.

18

E,M

Quill Gordon

Eperous pleuralis

Mid April-Mid May

P.M.

14

E

Hendrick- son

Ephemerella subvaria

Mid April-Mid May

P.M.

14

E.M

Grannom

Brachycentrus sp.

Mid-late April

P.M

14-16

E.M

Sulphur Dun

Ephemerella rotunda/invaria

Mid May-late June

Even.

14-16

E.M.

March Brown

Stenonema vicarium

Mid May-Mid June

A.M./P.M.

12

E.M.

Green Drake

Ephemera guttulata

Mid May-Mid June

P.M. Even*.

8

E.M.

Blue Winged Olive

Drunella cornuta

Mid May-Late June

A.M. S#

14

E

Dark Green Drake

Litobranchia recurvata

Mid May-Mid June

A.M./Even *

8

E.M.

Light Cahill

Stenacron interpunctatum*

Mid-May Late June

P.M./Even

14

E.M.

Pale Even Dun

Ephemerella dorothea

Late May Mid July

Even

18

E.M.

Little Green Stonefly

Isoperla imbecilla

June-Mid July

Day

16

E.M.

Giant Stonefly

Pteronarcys dorsata

June

Even.

6

E.M.

Slate Drake

Isonychia sp*

June-Oct.

Even.

12-14

E

Yellow Stonefly

Isoperla bilineata

June-late July

Day

14

E.

Blue Quill

Paraleptophlebia memorialis

July

A.M.

18

W

Trico

Tricorythodes*

Mid July- Mid Sept.

A.M.

24-28

All

Blue Quill

Paraleptophlebia gutta

Mid June-Mid Aug.

A.M.

18

All

 



Notes: Litle Blue Winged Olive may have two to three broods on some streams; Grannon (Brachycentrus sp) refers to many different species all called the Grannom.  S# refers to a sporadic emergence.  Light Cahill (Stenacron sp) inludes the species canadense. Slate Drake (Isonychia sp.) inlcudes many species. The Trico (Trycorythodes sp.) includes atratus, stygiatus, and minutus.  All emergence times are approximate and depend on local conditions. Size is also variable. 

 

 
 
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