Fly Fishing Trout Fly
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Fly Fishing Nymph

California: Trinity River Hatch Chart

FlySizeJanFebMarAprMayJunJulAugSepOctNovDec
Blue Winged Olive16 - 20       
Golden Stonefly8 - 12        
Midges (various)18 - 20   
Pale Morning Dun14 - 18     
Callibaetis12 - 16         
Salmon Fly4 - 8           
Caddis (various)12 - 18       
October Caddis6 - 10           
Click Fly Name to see patterns that imitate it.