When does the Stenopsyche Caddis hatch?

June–September, typically 18:00–21:00. It starts from about 12°C, peaks around 18°C and tails off by 24°C.

How big is the Stenopsyche Caddis?

Adult stage: 22–30mm. That matches a #6–4 hook.

Caddis · Aquatic insect

Stenopsyche Caddis

Q: What flies imitate the Stenopsyche Caddis?

Stenopsyche Caddis (large), Elk Hair Caddis, Stimulator, Sakasa Kebari, typically on a #6–4 hook.

Stenopsyche marmorata

Size

22–30mm

Hook size

#6–4

Hatch window

Season June–SeptemberPeak time 18:00–21:00

Water temperature

18° peak

12°24°

How fish feed on it

Adult insects on the water are inefficient — a caddis skittering to lay eggs, a stonefly blundering about after crawling out, neither built for elegance. Trout treat it as an easy meal and a bit of theatre at once, chasing a moving fly with more enthusiasm than they'd ever give a still one. Movement is the tell; a static adult imitation often just sits there unloved.

Flies that imitate this

Stenopsyche Caddis (large)

Elk Hair Caddis

Stimulator

Sakasa Kebari

Ecology

Rivers & stillwaterFreestone riversAlpine riversSpate rivers

Where you'll find this

East AsiaPresent

Present throughout

Identification

Stenopsyche marmorata is a species of caddisfly found in Japan. The larvae live in fast-flowing streams and are harvested by Japanese fishermen for zazamushi , a traditional dish made from a mixture of aquatic insect larvae cooked in soya sauce and sugar. This species is widely distributed in Japan, Sakhalin (Russia), the Korean Peninsula, northeastern China, and the Russian Primorsky Territory.

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