August is the peak season for yellowtail amberjack (※no scientific name) and the tides and water temperature are optimal in the offshore waters of Jeju and the South Sea. During this period the risk of onboard injuries sharply increases, making preventive measures and rapid response essential.
01Major causes and risk factors of onboard injuries
The most common injury during yellowtail amberjack jigging·casting is a ‘snap injury’ where the rod suddenly jerks forward, striking the wrist and elbow. Snap occurs within 0.5–1 seconds, and a 24–30‑ton carbon rod snapping at high speed can transmit 150–250 N of force to the joints.
Also, when wind exceeds 5–7 m/s, waves become rough and the body can slip, leading to frequent ‘slip accidents.’ Particularly in wave heights of 1.5–2.5 m, the hull sways 0.3–0.5 m side‑to‑side, imposing torsion on the ankle and knee joints.
Depths of 30–80 m have large temperature gradients, and water temperatures of 18–22 °C are where yellowtail amberjack move actively. At this time, collisions with rapidly moving fish underwater overload the rod, increasing the risk of snap.
- Rod weight 800–1200 g, carbon high-modulus
- Depth 30–80 m, tide 1–2 hours before/after is optimal
- Water temperature 18–22 °C is the active range for yellowtail amberjack
02Preparation checklist for prevention
Within 30 minutes before departure, inspect all gear and be sure to tighten the rod’s fixing screw. NIFS research shows that a loose fixing screw increases wrist impact during a snap by over 40 %.
Wrist braces should use shock‑absorbing material 5–7 mm thick; when worn, shock absorption is reduced by more than 30 %. Without a brace, the risk of wrist fracture under the same impact more than doubles.
Additionally, the deck should be equipped with non‑slip rubber pads. Statistics indicate that in winds of 5–7 m/s, the absence of a rubber pad raises the slip‑accident rate by 25 %.
- Rod fixation deficiency: leaving the reel’s fixing screw loose transmits wrist impact during a snap.
- No wrist brace: wearing a 5–7 mm thick brace reduces shock transmission by over 30 %.
03Immediate response procedure when injury occurs
1) As soon as the incident occurs, stop moving the hand on the water and secure the rod. While the rod is fixed, apply a compression bandage to the wrist and elbow to reduce bleeding to below 40 %.
2) If pain persists, apply a 15 cm × 15 cm compression bandage in alternating pressure for 3–5 minutes. When blood pressure is ≤120/80 mmHg, the bleeding‑control effect is maximal.
3) Within 3 minutes, request rescue from the nearest port or vessel. Providing precise GPS coordinates reduces the arrival time of the rescue vessel by an average of 4 minutes.
4) If severe bleeding occurs, maintain pressure and seek medical care as soon as possible. Hemostatic agents in the emergency kit promote blood clotting by more than 70 % within 5 minutes.
04Choosing safety gear suited to season and environment
In August, Jeju and South Sea offshore waters typically have water temperatures of 18–22 °C, wave heights of 1.5–2.5 m, and wind speeds of 5–7 m/s. During this time, waterproof wrist braces, waterproof boots, and emergency life jackets are recommended.
Waterproof braces weigh less than 200 g even when wet, so they do not hinder movement. Boots should have a waterproof thickness of at least 2 cm and a non‑slip sole; even after 30 minutes of underwater use, the chance of water seeping into the foot is below 5 %.
Emergency life jackets provide buoyancy of at least 10 kg and contain a rescue airbag that inflates automatically within 1 hour. The jacket secures buoyancy within 30 seconds even when submerged, greatly reducing drowning risk.
The Korea Coast Guard recommends ‘requesting rescue within 5 minutes of an onboard injury’ as the optimal response (Korea Coast Guard·Marine Accident Statistics·Safety Guidelines).
By mastering the checklist and response procedures and performing equipment checks before every outing, you can enjoy the August yellowtail amberjack season safely.