Freshwater · Spring to autumn over gravel beds in mid-reaches
Kamatsuka Gudgeon
Pseudogobio esocinus
A small bottom-dwelling gudgeon of Japanese rivers, common and widespread across the country. With its long snout and fleshy lips it vacuums insect larvae from sand and gravel, and it is a regular bycatch in river bait fishing. Its close relatives in Korea are likewise common river fish.
Seasons · Peak
Identifying features
- Long fleshy snout projecting over a small underslung mouth
- Thick, fleshy lips used to suck food from sand and gravel
- One short pair of barbels at the mouth corners
- Slender sandy-brown body with a row of dark blotches along the flank
- Pale belly flattened for resting on the bottom
Habits
- Lives on sand-gravel bottoms, half-buried or tight to the bed
- Feeds on chironomid and mayfly larvae and other small invertebrates
- Ambushes drifting food from a fixed station on the bed
- Most active in the warmer months, spring to autumn
- A standard bycatch of worm and dough baits fished on the bottom
Distribution
Regional coverage expanding
Where to find them
- Tama River middle reaches gravel runs
- Yodo River sand-gravel flats
- Chikugo River middle reaches in Kyushu
Where they live
How to catch them
Light bottom rig on gravel runs River
Rig: Light ledger rig with a small sinker and size 12-16 hook resting on sand-gravel
Bait/lure: Worm pieces or maggots
Key tip: Cast into slow edges below riffles and let the bait sit still; bites are small, quick plucks.
Micro bait fishing in mid-reaches River
Rig: Fine float or marker rig with a tiny hook drifted just over the bed
Bait/lure: Tiny dough bait or a single maggot
Key tip: Keep the bait crawling along the bottom; kamatsuka will not rise to intercept it.
Best baits & lures
Baseline setup
- Rod: Light 6-8 ft river rod
- Line: 4-6 lb mono main line
- Terminal: Small split shot or light ledger sinkers, size 12-16 hooks
Recommended gear for this species
Rod · Best value
9' 5-weight fly rod outfit
≈ US$180-260
Covers chironomid lakes and small rivers with one setup.
Flies · Budget
Chironomid assortment (30 patterns)
≈ US$25-40
Chironomids are 60% of a lake rainbow's diet in spring.
Picks come from our rule library — never paid placements. Prices are guides; affiliate links may earn us a commission.
Typical size
Common 4-6 in (10-15 cm); large fish to about 8 in (20 cm)
On the table
Minor — small and bony; occasionally eaten locally but usually released.
Similar species
Regulations vary by area and can change in-season — always check the official rules for your area before you fish. Regulations guide →
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