Freshwater · Spawning spring April-June; active May-September

Korean Rose Bitterling

Rhodeus uyekii

Korea's rosy bitterling — 각시붕어. It is the reason 'fingernail fishing' (손톱낚시) exists — hooks no bigger than a fingernail — and the mussel into which the female lays her eggs in spring. A charming micro-fish of slow vegetated edges. Take care: the big bitterling relatives (납자루) sharing its habitat include protected species — always identify large bitterlings.

Seasons · Peak

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Korean Rose Bitterling — AI-generated image — AI-generated image — no verified freely-licensed photo of this species was available

Identifying features

Deep, laterally compressed body, colourful in season
Males in rose courtship colour; females with a long egg-laying tube (spring)
Body 1.5-2.5 in (4-6 cm); lateral line incomplete
A faint dark stripe along juveniles
Distinguished from similar 납자루 species by smaller maximum size

Habits

Females lay eggs through a long ovipositor into living freshwater mussels
Males turn splendid rose-pink in spring
A classic of Korean micro-fishing — 손톱낚시 ('fingernail fishing')
Loose schools along slow edges
Large bitterling relatives (납자루) sharing its waters include protected species — identify big bitterlings carefully

Distribution

Regional coverage expanding

Where to find them

Slow Han River edges, Gyeonggi-do
Seomjin River mussel habitats
Gimje canals, Jeollabuk-do

Where they live

Slow, vegetated edges of the Han, Geum and Nakdong systemsPaddy canals and backwaters holding freshwater musselsClear side-streams with mussel beds

How to catch them

Fingernail fishing (손톱낚시) River

Rig: Micro hook (size 26-28) with a rice-grain piece of bread, lowered weightless along slow edges where mussels live

Bait/lure: Rice-grain bread ball

Key tip: Fish over mussel beds — the bitterlings do not travel far; strike on the first touch.

Micro fishing at vegetated lake edges Lake

Rig: Tiny hook with a single maggot drifted along slow vegetated pond and lake edges near mussels

Bait/lure: Single tiny maggot

Key tip: Spring fish are in full colour — fish respectfully around mussels, as the fish's eggs develop inside them.

Best baits & lures

Tiny bread ballsMaggotsSoft algae

Techniques for Korean Rose Bitterling →

Baseline setup

Rod: Ultralight 4-6 ft rod
Line: 0.8-1.5 lb monofilament
Terminal: Tiny hooks size 24-28, micro split shot

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 1.5-2.5 in (4-6 cm)

On the table

Tiny; not for the table — a fish of mussel eggs and fingernail-sized hooks.

Similar species

Chinese Bitterling RelativeChinese bitterling relative is an elongate, muted small cyprinid; rose bitterling is deeper-bodied and, with its mussel spawning, far more colourful

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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