Hatch Chart for Ontario Canada
Mayflies
- Hendrickson
- Genus: Ephemerella subvaria
Hatch Period: late April - early May
Hatch Time: afternoon
Hook Size: 12-16 - Early Blue-Winged Olive
- Genus: Baetis spp.
Hatch Period: mid May - late May
Hatch Time: midday
Hook Size: 16-18
- Pale Evening Dun
- Genus: Ephemerella dorothea
Hatch Period: late May - early June
Hatch Time: evening
Hook Size: 18
- Green Drake
- Genus: Ephemera guttulata
Hatch Period: late May - early June
Hatch Time: dusk
Hook Size: 8-10
- Brown Drake
- Genus: Ephemera simulans
Hatch Period: late May - early June
Hatch Time: evening
Hook Size: 8-10
- Mahogany Dun
- Genus: Isonychia sp.
Hatch Period: early June - late September
Hatch Time: evening
Hook Size: 10
- Light Cahill
- Genus: Stenacron sp.
Hatch Period: mid June - late September
Hatch Time: evening
Hook Size: 14-16
- White-Winged Black
- Genus: Tricorythodes sp.
Hatch Period: early July - late July
Hatch Time: early morning
Hook Size: 20-22
- White Fly
- Genus: Ephoron leukon
Hatch Period: mid August - mid September
Hatch Time: evening
Hook Size: 14
- Blue Winged Olive
- Genus: Pseudocloeon sp.
Hatch Period: late August - mid September
Hatch Time: throughout the day
Hook Size: 22
Caddis
- Spotted Sedge
- Genus: Hydropsyche sp.
Hatch Period: early May - late August
Hatch Time: afternoon
Hook Size: 12-14
- Little Black Caddis
- Genus: Chimarra
Hatch Period: late May - early June
Hatch Time: morning
Hook Size: 18-20
- Great Orange Sedge
- Genus: Pycnopsyche spp.
Hatch Period: early - late September
Hatch Time: morning
Hook Size: 10
Stoneflys
- Early Black Stonefly
- Genus: Allocapnia sp.
Hatch Period: early April - early May
Hatch Time: midday
Hook Size: 16-18
- Golden Stonefly
- Genus: Paragentina media
Hatch Period: early June - mid July
Hatch Time: after dark
Hook Size: 8-10