Koi are not predators that ordinarily attack people. During hand-feeding they may mouth a finger, and a large struggling fish can be difficult to handle. The practical risks around a pond include slips, open water, equipment, and exposure to germs rather than dramatic fish attacks.
Feeding and Touching
Observe the fish in the water and avoid teasing, grabbing, or repeatedly touching it. A mouthful of food does not require someone to put fingers deep inside a koi's mouth. Use a calm feeding routine and supervise children. Protect the fish's mucus and fins by keeping handling for necessary care rather than entertainment.
Work Safely Around the Pond
- Provide secure footing and safe access to maintenance points.
- Supervise children and prevent unsupervised access to open water.
- Use appropriate equipment procedures; do not handle wet or faulting electrical devices.
- Use trained help and prepared equipment when a large koi must move.
Remember Fish and Water Can Carry Germs
Wash hands with soap and water after pond work or fish contact. Wear protective gloves for maintenance, particularly with cuts or damaged skin. Keep pond tools away from food preparation. People at higher risk of infection should follow their healthcare professional's advice about exposure.
Further reading: CDC: Staying Healthy Around Fish.
If You Are Injured
Seek medical advice for concerning or persistent symptoms after pond exposure and mention contact with fish or pond water. For the separate question of toxins and eating ornamental fish, read whether koi are poisonous. Handling planning explains how to reduce disturbance when a fish needs to be moved.