When does the Japanese Net-Spinning Caddis hatch?

May–September, typically 18:00–21:00. It starts from about 11°C, peaks around 15°C and tails off by 22°C.

What flies imitate the Japanese Net-Spinning Caddis?

Elk Hair Caddis, CDC Sedge, Sakasa Kebari, Stimulator, typically on a #14–12 hook.

How big is the Japanese Net-Spinning Caddis?

Adult stage: 8–12mm. That matches a #14–12 hook.

Caddis · Aquatic insect

Net-Spinning Caddis (Japan)

Hydropsyche orientalis

Size

8–12mm

Hook size

#14–12

Hatch window

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

Water temperature

15° peak

11°22°

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

Elk Hair Caddis

CDC Sedge

Sakasa Kebari

Stimulator

Ecology

Rivers & stillwaterFreestone rivers

Where you'll find this

East AsiaPresent

Present throughout

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