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Southern Ontario Hatch Chart : :    Mayflys  Caddis  Stoneflys



MAYFLIES

Name: Hendrickson
Genus: Ephemerella subvaria
Hatch Period: late April - early May
Hatch Time: afternoon
Hook Size: 12-16

Name: Early Blue-Winged Olive
Genus: Baetis spp.
Hatch Period: mid May - late May
Hatch Time: midday
Hook Size: 16-18

Name: Gray Fox
Genus: Stenonema fuscum
Hatch Period: late May - early June
Hatch Time: afternoon
Hook Size: 10-14

Name: Pale Evening Dun
Genus: Ephemerella dorothea
Hatch Period: late May - early June
Hatch Time: evening
Hook Size: 18

Name: Sulfur Dun
Genus: Ephemerella invaria
Hatch Period: late May - early June
Hatch Time: afternoon, evening
Hook Size: 16

Name: Green Drake
Genus: Ephemera guttulata
Hatch Period: late May - early June
Hatch Time: dusk
Hook Size: 8-10

Name: Brown Drake
Genus: Ephemera simulans
Hatch Period: late May - early June
Hatch Time: evening
Hook Size: 8-10

Name: Giant Drake
Genus: Hexagenia limbata
Hatch Period: early June - early July
Hatch Time: after dark
Hook Size: 4-6

Name: Mahogany Dun
Genus: Isonychia sp.
Hatch Period: early June - late September
Hatch Time: evening
Hook Size: 10

Name: Light Cahill
Genus: Stenacron sp.
Hatch Period: mid June - late September
Hatch Time: evening
Hook Size: 14-16

Name: White-Winged Black
Genus: Tricorythodes sp.
Hatch Period: early July - late July
Hatch Time: early morning
Hook Size: 20-22

Name: White Fly
Genus: Ephoron leukon
Hatch Period: mid August - mid September
Hatch Time: evening
Hook Size: 14

Name: Blue Winged Olive
Genus: Pseudocloeon sp.
Hatch Period: late August - mid September
Hatch Time: througout the day
Hook Size: 22



CADDIS

Name: Spotted Sedge
Genus: Hydropsyche sp.
Hatch Period: early May - late August
Hatch Time: afternoon
Hook Size: 12-14

Name: Speckled Sedge
Genus: Cheumatopsyche sp.
Hatch Period: early May - late August
Hatch Time: afternoon
Hook Size: 14-16

Name: Little Black Caddis
Genus: Chimarra
Hatch Period: late May - early June
Hatch Time: morning
Hook Size: 18-20

Name: Great Orange Sedge
Genus: Pycnopsyche spp.
Hatch Period: early - late September
Hatch Time: morning
Hook Size: 10



STONEFLYS

Name: Early Black Stonefly
Genus: Allocapnia sp.
Hatch Period: early April - early May
Hatch Time: midday
Hook Size: 16-18

Name: Golden Stonefly
Genus: Paragentina media
Hatch Period: early June - mid July
Hatch Time: after dark
Hook Size: 8-10
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