Baitfish · Fish
Kajika Sculpin (Japan)
Cottus pollux
Size
60–100mm
Always there
No hatch and no season — this is in the water every month of the year, so it's always a fair bet when nothing is showing on top.
How fish feed on it
Once a trout is big enough to take fish, it stops being an insect-eater in the way it was and becomes something closer to an ambush predator. Fry and small fish get pinned against margins, weed beds and shelves, and the takes are hard and unmistakable. Autumn is the classic window, when this year's fry are shoaling and the biggest fish in the water finally show themselves.
Flies that imitate this
Sculpin Streamer
Woolly Bugger
Black Zonker
Muddler Minnow
Ecology
Where you'll find this
- East AsiaPresent
Present throughout
About the genus Cottus
The Japanese fluvial sculpin ( Cottus pollux ) is a species of fish in the family Cottidae. It is endemic to Japan, where it inhabits mountain streams in Honshu, Shikoku, and Kyushu. It reaches a maximum length of 15.0 cm (5.9 in) .