Hatch Chart of Tokyo – Mountain Creeks

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Season

Pattern Size Colour MAR APR MAY JUN JUL AUG SEP
Chironomid  4mm brown X
Crane Fly  8mm pale blue
white
X
Stonefly Small 1  8-10mm black X  X  X
Stonefly Small 2  8-10mm pale green  X  X  X
Stonefly Large 15mm pale yellow X X X X
Caddisfly Small  10mm brown X  X  X  X
Mayfly Small 1  8-10mm brown X X  X  X  X
Mayfly Small 2  8-10mm yellow green X  X  X  X  X  X
Mayfly Large  20-25mm brown  X  X  X  X  X

How to Translate This Chart into Dry Fly Pattern

Use size 18 hook to imitate patterns for insects around 8-10mm size and size 12 for those double the size. Then please keep in mind that size and colour matter more as you fish slower water where fish have enough time to validate your offering.