Late August, cuttlefish return to the coastal waters
Cuttlefish classified by the National Institute of Fisheries Science (Sepia esculenta) grow after completing spring spawning and passing through summer. In the West and South Seas, Enter breakwaters, tetrapods, and inner harbor areas from late August to early September and the eging season peaks until mid‑October. Cuttlefish feeding activity is most vigorous when water temperature drops from 22 °C to 17 °C.
01The season is measured by water temperature, not the calendar
Autumn cuttlefish activity is not tied to a fixed calendar but coastal surface water temperature must be used as the basis for accurate targeting. Coastal observation data from the Korea Maritime Institute (KIOST) show the following temperature ranges clearly.
- Water temperature 21–23 °C (Late August ~ Mid September): Early offshore entry. Numbers are low but activity is high.
- Water temperature 18–20 °C (Late September ~ Mid October): Overwhelming peak. Moves into breakwaters and tetrapods for feeding.
- Water temperature 16–17 °C (Late October ~ November): Activity decline. Moves to deeper water (over 8 m) and then begins wintering migration.
If you check the Korea Meteorological Administration coastal buoy data the night before the fishing trip, you can mentally set the action strength for that day.
02Standard eging rig
Domestic cuttlefish eging is tilt casting series rod + egi + PE braided line the basic setup.
- Rod: 7.6~8.6ft eging‑only, action grade L~ML
- Reel: 2500~3000 size, high gear preferred
- Main line: PE #0.5~0.8 (coastal recommended #0.6)
- Leader: Carbon 1.5~2 go, 1~1.5 m
- Egi: 3.0~3.5 go (on days with clear activity use 3.5 go, when bites are weak use 3.0 go)
Surprisingly missed points: Early season (late August) cuttlefish respond better to 3.0 go. The individuals are still small, so small egi elicit bites more readily.
03Egi color — two axes: ‘weather’ and ‘search’
Egi color selection is Weather(clear/overcast) and Search(clear/turbid) approached as a 2‑dimensional matrix.
- Clear weather + clear search: natural·olive·brown (natural color)
- Clear weather + turbid search: orange·pink (contrast color)
- Overcast weather + clear search: light brown·gold (mid tone)
- Cloudy day + murky water: green·chartreuse (high contrast)
Prepare three or more egi lures, and if there’s no bite within the first 30 minutes, change the color series. "Holding the same egi for over an hour" is the most common failure pattern in autumn eging. It is.
04Action operation — the three beats of shake·fall·pause.
Cuttlefish action follows the standard rhythm below.
- Shake (shake)— Short, sharp taps on the rod tip 3–5 times. A signal that bait is present.
- Fall (fall)— Release tension so the egi descends naturally (3–5 seconds).
- Pause (pause)— Maintain stability for 0.5 seconds just before reapplying tension. The bite arrives at this moment.
Over 90% of bite signals are a “stop” or “slowdown.” If tension suddenly disappears during the fall, or when you try to reapply tension and feel a ‘heaviness,’ hookset immediately. Clear ‘tap’ signals like those of typical species rarely occur.
05Three point types
- Seawall outer channel Depth 4–7 m, around tetra structures. Main season late August to mid‑September.
- Inside the harbor Depth 3–5 m, sandy‑gravel bottom. Spot stays from late September to mid‑October.
- Inner island stone structure·rocky shore Depth 5–10 m, slope and small reef. Bites concentrate during the high‑activity period (immediately after high‑tide to low‑tide transition).
When one fish is caught, there is a high probability another individual is within a 3–5 m radius. Rather than moving quickly to a new point, exploiting a well‑caught spot for an additional 5–10 minutes. It is advantageous for this catch rate.
06The most common mistake; avoiding this alone cuts failures by half.
- Persisting with the same egi for over an hour.— If no bites occur within the first 30 minutes, change the color series. Stubbornness is the most common failure pattern.
- Using only large egi in the early season.— Late August cuttlefish are smaller and respond better to size 3.0. Insisting on 3.5 will miss bites.
- Raising the line from a caught spot too quickly.— When one fish is caught, another is within a 3–5 m radius. Rather than moving quickly, pursue for another 5–10 minutes.
07The next month.
Based on the Korea Hydrographic and Oceanographic Agency tide tables, the spring‑tide and neap‑tide cycles after late August determine the cuttlefish bite concentration periods. Generally One hour before and after the incoming‑outgoing water transition. This is the classic rule, and the low‑light periods just before sunrise and just after sunset have higher bite probabilities than usual.
Autumn cuttlefish are not a flashy species. However, a one‑degree temperature change, a 30‑minute current shift, or a two‑day calendar variation can alter their behavior. Those who consult the data catch them well.