Cuttlefish form large schools during their spawning period in May–June, and reach an autumn peak in September–November.
Particularly in June, water temperatures are stable at 12–24 °C on both the West Sea and South Sea, a time when cuttlefish are highly active.
According to water temperature and depth data from the Korea Maritime Institute (KMI), the central West Sea records an average temperature of 18–22 °C at depths of 60–120 m, while the southern South Sea records 20–24 °C at 70–110 m.
These conditions provide the optimal efficiency for Omorig rigs.
01Omorig rig principle and sinker selection
Omorig is a compound of ‘omori (weight) + rig (tackle)’, with the sinker and jig placed separately.
Heavy sinkers (15·20·25·30 go) → sink first and quickly reach the target depth, and a jig attached to a 1–1.5 m leader drifts with the current.
A 20 go sinker weighs about 75 g, 25 go about 90 g, 30 go about 110 g, and is chosen according to depth and current strength.
The deeper and stronger the current, the more you use a 30 go; in shallow, calm water, 15–20 go is used.
Slim long‑type sinkers minimize bottom snagging and allow rapid bottom‑layer exploration.
02Rig adjustment for depth, temperature, and current
Cuttlefish move actively within a 12–24 °C temperature range.
In the central West Sea, the 60–120 m layer yields the highest catches, and deeper water brings stronger currents.
Therefore, for depths shallower than 80 m, 20–25 go sinkers are recommended; for depths over 100 m, use 30 go.
Jig colour varies with current and depth.
In shallow water and weak currents, natural‑coloured (transparent or silver) jigs reduce wariness, while in deep water, strong currents, or night time, glow jigs increase visibility.
The main line uses PE 0.6–1.2 go to balance strength and transparency, and a fluorocarbon leader of 12–20 lb provides bite transmission.
03Bite characteristics and safety points
Because the jig is attached to the end of the leader, a slight twitch is not detected.
Instead, a strong bite is felt when the jig fully hooks the hook, producing a pulling sensation.
The feel is judged by the resistance at the moment the hook is drawn into the water.
When the bite feels strong, immediately raise the lip to lift the hook.
Safety points: the jig hook is sharp and poses a high injury risk, so wear gloves and use a hook case when changing hooks.
Also, in strong currents the sinker may not stay on the bottom; add weight or switch to a slim long‑type sinker to minimize bottom snagging.
- Undersizing the sinker weight causes the rig not to reach depth, leaving the jig near the surface.
- Using only dark‑coloured jigs in strong currents reduces visibility.
- If you miss the bite and do not raise the lip immediately, the jig disappears into the water.
04 FAQ
- Q1. In June, which is better, the West Sea or the South Sea? A1. Both regions fall within the 12–24 °C range, but the West Sea has relatively weaker currents, making it suitable for beginners, while the South Sea has stronger currents and larger schools, favoring experienced anglers.
- Q2. In an Omorig rig, should the jig and sinker be replaced simultaneously? A2. It depends on the situation. If depth or current changes significantly, adjust the sinker weight, and change jig colour or length according to tide and lighting.
- Q3. What to do when the bite feels weak? A3. When the bite is weak, raise the lip slightly to let the hook move in the water, and switch the jig colour to a glow type to improve visibility.