Saltwater · Summer-autumn in warm water; peak August-October
Korean Filefish
Thamnaconus modestus
The grey-brown, leather-skinned filefish of Korean harbours and reefs — 말쥐치. The common coastal filefish, prolific at piers and from boats, and one of Korea's most valued table fish: the firm white flesh is served as hoe (sashimi). Its beak mouth strips baits, so small strong hooks are a must.
Seasons · Peak
Identifying features
- Rough, sandpapery, leathery skin — a filefish, not smooth triggerfish hide
- A single stout erectile dorsal spine
- Small beak-like mouth with prominent teeth
- Grey-brown to olive plain colour
- Oval, laterally compressed body to about 14 in (35 cm)
Habits
- Swims in loose groups over reefs and harbours
- Crushes crustaceans, molluscs and sea urchins with strong beak teeth
- Tough, leathery skin — must be peeled off to eat
- More active in summer and autumn warm water
- A beak-mouthed bait stealer — hooks often come back bare
Distribution
Regional coverage expanding
Where to find them
- Busan harbour grounds, south coast
- Yeosu piers
- Pohang east-coast reefs
Where they live
How to catch them
Boat fishing over mixed ground Boat
Rig: Bottom rig with shrimp on small strong hooks, fished from a boat over reef and sand in 30-80 ft
Bait/lure: Shrimp pieces or sandworm
Key tip: Filefish nibble — compress the bait to a firm wad and strike at the first solid pull.
Pier fishing at harbour walls Rock fishing
Rig: Light bottom rig with clam or shrimp dropped straight down the pier wall
Bait/lure: Clam meat or shrimp
Key tip: Filefish hold tight to structure — fish vertically at the wall with no casting distance.
Best baits & lures
Baseline setup
- Rod: Light 7-8 ft boat or pier rod
- Line: 8-12 lb monofilament or light braid
- Terminal: Small strong hooks size 4-6, 10-20 g bottom 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 8-12 in (20-30 cm); large fish about 14 in (35 cm)
On the table
One of Korea's best eating fish — firm white flesh, popular as hoe (sashimi) and in soups.
Similar species
Regulations vary by area and can change in-season — always check the official rules for your area before you fish. Regulations guide →
Plan a trip for Korean Filefish
Build today's plan