NAGASAKI · 長崎 · Japan

65

of 72 shark approaches deflected.
Sagami Bay, 2022.

海園 · Kaien

Developed in Nagasaki. Field-tested from Sagami Bay to Raja Ampat.

65/72 approaches deflected
2–10m effective radius
50+ retailers across Japan
PRODUCT · 製品
漁業用
FISHING · 漁業用

Kaien 海園

An electronic shark deterrent for fishing lines. Generates timed electrical pulses targeting the Ampullae of Lorenzini at the tip of a shark's snout. The overstimulation causes avoidance behaviour within a 2–10 metre radius. No modification to your existing rig.

  • Size90 × 50 mm
  • Weight55 g
  • Range2–10 m
  • PowerLithium-ion, rechargeable
  • ActivationAuto on seawater contact
  • PatentJP 6582307 · 7291364 · 7351519 · 7356768
ダイビング用
DIVING · ダイビング用

Kaien Diving 海園

An electronic shark deterrent worn on the wrist. The same electrical pulse technology as the fishing unit, adapted for full-dive use. Continuous protection from entry to exit.

  • Size90 × 50 mm
  • Weight55 g
  • Range2–10 m
  • PowerLithium-ion, rechargeable
  • WearWrist-mount, carabiner clip
マグロ用
TUNA FISHING · マグロ漁業用

Kaien Tuna Ring 海園

Clips directly to your Maguro ring via the Kaien joint adapter. The same electrical pulse deterrent, configured for offshore tuna fishing where shark interference with lines and catch is highest.

  • FitsAll Sany Maguro ring sizes
  • Range2–10 m
  • AdapterKaien joint, ¥561
  • PowerLithium-ion, rechargeable
  • ActivationAuto on seawater contact
養殖用
AQUACULTURE · 養殖用

Kaien Farming 海園

Permanent shark deterrent installation for fish pens and aquaculture nets. Stainless steel housing with dual electrode probes, designed to run continuously from the net perimeter. Protects salmon, tuna, and yellowtail operations from predator breaches.

  • HousingMarine-grade stainless steel
  • InstallationPermanent, net perimeter
  • OperationContinuous, 24/7
  • MechanismTimed electrical pulses
  • ApplicationSalmon, tuna, yellowtail farms
HOW IT WORKS · 仕組み

The Lorenzini
organ.

ロレンチーニ器官

All sharks and rays possess the Ampullae of Lorenzini: a dense network of electroreceptor cells at the tip of the snout, used to detect the minute electrical fields produced by living prey.

Kaien generates a precise electrical field in the surrounding water. When a shark enters the 2–10 metre radius, its Lorenzini organs are overstimulated. The resulting sensation causes the shark to change direction.

Activates automatically on seawater contact. No switches. No settings.

Active radius 2–10 m
Mechanism Timed electrical pulses
Target organs Ampullae of Lorenzini
Species deterred Sharks and rays
Activation Automatic, seawater contact
Sagami Bay trial 65 / 72 deflected

Kaien reduces the probability of shark damage. It does not guarantee complete avoidance in all conditions. Shark behaviour varies by species, individual, and feeding state.

WHERE TO BUY · 取扱店舗
Wholesale enquiries →

Stocked at fishing tackle retailers across Japan. International orders: info@kaien.tech

焼津漁具センター Yaizu, Shizuoka
釣り助オンラインショップ Kawasaki, Kanagawa
釣り具のジャイアント 草加店 Soka, Saitama
藤森釣具 Online
STORY · 物語 · NAGASAKI

Coexist
with sharks.

サメと共存する。

As ocean temperatures rise, shark encounters are increasing across Japan. Anglers lose catch. Fishing gear is destroyed. Aquaculture nets are breached. The economic damage is real. And growing.

Culling, cages, abandoning the water altogether. The conventional responses are costly, dangerous, or ecologically harmful. The IUCN Shark Specialist Group lists 17 of 58 shark species as threatened with extinction. Extermination is not a solution.

Since 2013, 株式会社花園 has been developing a different answer. Field testing began in Japanese waters. The result is an electrical shark deterrent that works reliably, automatically, without harming the sharks. 海園 is the result.

Today the electrical shark deterrent is used by fishermen, divers, and fish farms across Japan. The goal has not changed, and it is printed on every Kaien business card: サメ被害ゼロを目指す — aiming for zero shark damage.

サメと共に、海へ。 Into the sea, together with sharks.

CONTACT · お問い合わせ

General enquiries

info@kaien.tech

Wholesale & distribution · Deniz Co., Ltd. (Mr. Suzuki)

+81 90 2665 0018