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Kusuri Masuizai Fish Anesthetic – Safe Koi Sedative
Price range: £7.00 through £41.57
A highly effective and safe anesthetic used to sedate fish before handling, surgery, wound treatment, or transportation, reducing stress and injury risk. Also known by its original Japanese name, Kusuri Masuizai.
- ⚖️ Under 2kg: £3.49
- ⚖️ 2kg – 5kg: £4.99
- ⚖️ 5kg – 10kg: £6.99
- ⚖️ 10kg – 20kg: £11.49
- ⚖️ 20kg + £14.99
Please check the cart for accurate rates on bulky items.
Prices are for UK Mainland Postage Only.
Kusuri Masuizai: The Essential Fish Anesthetic
Kusuri Masuizai Fish Anesthetic is an essential product for every serious koi keeper. Handling fish for tasks like measuring, examining, or treating wounds can cause immense stress. Consequently, this stress can weaken the fish’s immune system, leading to further health problems. This product provides rapid, controlled anesthesia, making the entire process safer and calmer for both you and your fish. Furthermore, it is simple to use and allows you to perform necessary procedures with precision.
The ability of Kusuri Masuizai Fish Anesthetic to rapidly induce a state of sedation is paramount. Therefore, reducing physical struggle drastically lowers the risk of post-handling infections and injury, which is a key priority for all responsible koi keepers.
The formula ensures quick recovery. In addition, once the procedure is complete, you can safely and quickly revive the fish. This minimizes the time they are out of the water. Using a fish anesthetic (also called Masuizai in Japanese) is the most humane way to handle valuable or stressed fish. Pond keepers widely agree on this approach.
Application Guide for Kusuri Masuizai Fish Anesthetic
Masuizai: Ideal for Stress-Free Health Procedures
- Examination: Safely sedate the fish for close-up viewing, scale checks, and swab collection.
- Wound Treatment: Provides a stable environment to clean, seal, and treat open wounds or ulcers without the fish thrashing.
- Surgery and Minor Procedures: Allows for intricate work, such as fin repair or internal injections, with reduced risk of injury.
- Transport: Minimises movement and stress during transfers or long-distance transportation.
Simple and Controlled Dosage of Koi Sedative
- Prepare the Bath: Add the recommended dose of Kusuri Masuizai Fish Anesthetic to a separate container of pond water. Always use an air stone to ensure high oxygen levels.
- Sedation: Gently place the fish into the sedative bath. The fish will quickly become anesthetized. The entire process is controlled by you.
- Recovery: Once the procedure is finished, move the fish to a clean water bath with heavy aeration until it begins to swim freely. Recovery is typically fast and uneventful.
| Volume (ml/L) | 250ml, 500ml, 50ml |
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Kusuri Masuizai Fish Anesthetic - Safe Koi Sedative 





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