Mayfly in Tokyo

2019/01/142020/11/25chart,Fly fishing,hatch,Japan,mayfly,Tokyo

For mayfly traditionalists:
According to the statistics shared by my friend who also fish Tokyo's stream, 90% of mayfly diet by trout consist of:

Ephemerellidae - spiny crawler, Madara Kagerou
Heptageniidae - stream mayfly, Hirata Kagerou
Ephemeridae - drake, Mon Kagerou
Baetidae - batis, Ko Kagerou
Leptophlebiidae - blue, Tobiiro Kagerou
Caenidae - caenis, Himeshiro Kagerou

Hatch Chart

HatchSeason	Family	CommonNames	Size	Colour	HatchType	NymphType
March-April	Leptophlebiidae トビイロカゲロウ科	Blue Quill	22	Black, brown, Tan	Topwater	Clinger
March-September	Baetidae コカゲロウ科	Batis	18-22	Tan	Topwater	Swimmer
April-June	Heptageniidae ヒラタカゲロウ科	Stream Mayfly	14-18	Brown, black	Underwater	Clinger
July-August	Caenidae ヒメシロカゲロウ科	Caenis	26	Tan, brown	Topwater	Crawler
May-June	Ephemeridae モンカゲロウ科	Drake	10	Tan	Topwater	Burrower
May-September	Ephemerellidae マダラカゲロウ科	Spiny Crawler	18	Carrot, tan, brown	Topwater	Crawler

 

Minority Hatch

Baetiella - twin tail batis, Futaba Ko Kagerou

 

Notes:

Heptageniidaet and baetiella hatch inside water then emerge to surface, so you need floating nymph for slow run/wetfly for fast run. Baetiella always sits with its wing open when being still, so need to cover that with spent pattern.

Caenidae is the micro mayfly you see from time to time around 3mm in size only hatching in slow water with silty bottom which is not very usual in mountain rivers, but I see them selectively eaten in slow pools in village river or stock river.

Ephemerellidae is very common mayfly in Tokyo's mountain stream in June for morning and evening hatch. Daytime is either stream mayfly on size 14 who hatch inside water or terrestrial such as small beetles and ants.

 

Good reference to understand mayfly nymph.

http://museinfo.hitohaku.jp/kawamushi/zukan/kagerou.html

Swimmer, clinger, crawler, and burrower.
How they spread apart in the same water is probably very comparable with crustaceans which I will follow up later.

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