Saltwater · Year-round over reefs; best spring through autumn
Sebastiscus tertius
Sebastiscus tertius
A small Sebastiscus rockfish relative of the south and Jeju reefs — 열기. It sits over rock and mixed ground and is mostly taken as bycatch during rockfish trips. The genus is familiar in Korea — the larger 쏨뱅이 (Sebastiscus marmoratus) is the famous one. No established English common name exists; the scientific name is used as the display name.
Seasons · Peak
Identifying features
- Small, stocky, with large spiny fins like a miniature rockfish
- Reddish-brown marbled colour
- Head with strong spines and ridges — a Sebastiscus, not Sebastes
- No bold banding on the body
- Reaches only about 10 in (25 cm)
Habits
- A small, sedentary rockfish relative in the genus Sebastiscus
- Lives close to the bottom, eating shrimp and small crabs
- Mostly encountered as bycatch while rockfish fishing
- Motionless in rocky cover; an easy drift hook-set suffices
- One of the 'small bolak' group around Jeju and the south coast
Distribution
Regional coverage expanding
Where to find them
- Geoje island reefs, south coast
- Tongyeong stony grounds
- Deep water off Jeju harbours
Where they live
How to catch them
Boat bottom fishing over reef Boat
Rig: Bottom rig with shrimp on small hooks fished from a boat over 30-100 ft reef
Bait/lure: Shrimp pieces
Key tip: It sits in cover — let the rig rest on the rock and give the tiny bite time to develop.
Drift fishing while targeting rockfish Boat
Rig: Light bottom rig with fish strips drifted over reef edges during rockfish sessions
Bait/lure: Small fish strips
Key tip: Many of these little fish come as incidental catch — return the small ones so the reef stocks stay healthy.
Best baits & lures
Baseline setup
- Rod: Light 6-7 ft boat rod
- Line: 8-12 lb monofilament or braid
- Terminal: Hooks size 4-6 on a bottom rig, 10-20 g sinkers
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 6-9 in (15-22 cm); large fish about 10 in (25 cm)
On the table
Good — white flesh, used as soup and grilled fish in Korea.
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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