August is the most suitable time for Spanish mackerel walking lure trips. Targeting water temperatures between 22–26 °C and depths of 15–30 m at West Sea and South Sea breakwaters can yield a high bite probability.
01Optimal water temperature, depth, and time-of-day conditions
Spanish mackerel are active at 22–26 °C and primarily inhabit depths of 15–30 m. The most effective tides are the two hours before and after sunrise and sunset when currents are weak, with a particularly sharp increase in fish activity just before sunset.
When water temperature is at or below 24 °C, Spanish mackerel move to shallow depths (10–15 m) and respond to surface‑near lures; above 26 °C they descend to the mid‑water layer (20–25 m), so adjust line length accordingly.
In addition to the sunrise/sunset windows, water clarity improves between 04:00–06:00 and 19:00–21:00 as currents slacken, making lures appear clearer and field data show an average 15 % increase in bite frequency.
02Walking lure selection and rig tips
Walking lures of 10–15 g split‑bait are optimal. Set reel drag to about 1.5–2.0 kgf and use 0.12–0.18 mm PE #4–6 line for natural movement in the current.
For depths greater than 20 m, choose 0.15 mm PE #5–7 to reduce line friction, and when wind exceeds 15 kt attach a fine spiral stabilizer to the split‑bait to keep it steady in the chop.
When the lure pauses underwater for 1–2 seconds, bites tend to concentrate; maintaining a retrieve speed of 0.8–1.0 m/s mimics Spanish mackerel chasing a school and can raise bite rates by 10–12 %.
- Use a rig bead 0.25–0.35 mm
- Leader: 0.10–0.12 mm carbon, 8–12 go
- Reel: recommend a 2.5–3.5 kg model
03Breakwater safety & Spanish mackerel tooth injury prevention
Breakwaters are prone to rapid changes in waves and currents, increasing slip risk. Check wave height and wind speed on site before the trip, and always wear non‑slip shoes and a life jacket.
Especially in late August, the South Sea breakwaters experience strengthening southwest winds that can raise wave heights to 2–2.5 m; if waves exceed 2 m, it is recommended to start the trip about 30 minutes earlier and move to a safety zone.
Spanish mackerel have 30–40 sharp teeth about 2–3 cm long, so if the lure is pulled up too aggressively and jumps out of the water it can snag on the teeth and break. Therefore, during the retrieve keep the lure submerged for at least 0.5 seconds.
- Pulling the lure up too aggressively can snag on Spanish mackerel teeth and cause damage
- Holding the lure too lightly lets it bounce in the sea swell, making bites easy to miss
04Pre‑trip checklist
Items that must be checked before the trip are: verify wind, wave height, and currents from the Korea Meteorological Administration marine weather information, and inspect life jackets and waterproof gear according to Korea Coast Guard safety regulations.
In August, southwest winds are frequent, shifting wind speeds between 12–18 kt. When wind exceeds 15 kt wave height rises sharply, so scheduling the trip when wind is 10 kt or less is safest.
Upon arrival, directly ask local anglers for the latest tide and wave information, and be sure to check the restricted zones marked on marine signage to avoid illegal fishing.
- KMA marine weather: wind ≤10–15 kt, wave height 1–2 m
- Korea Coast Guard: verify breakwater zone signage
- NIFS fishery data: regional Spanish mackerel catch trends
‘Breakwaters are always highly variable, so rechecking tide and wave conditions on site is the key to both safety and success.’