Ghost Koi Blamed for Goldfish Wounds—Real Culprit?

Herons: spear wounds, often fatal.
Mammals: raccoons, mink, cats bite and tear.
Turtles: can bite chunks if present.

Goldfish dying with head wounds in a pond with one 7-inch ghost koi. Owner wonders if koi is attacking.

Koi Are Not the Aggressor

A 7-inch koi cannot inflict chunk wounds. Koi swallow small fish whole or nip fins; they don't bite pieces out.

Examine wound shape: holes = birds; tears = mammals. Secure pond with netting or electric fence. The ghost koi is innocent.

Pond and Water Gardening: Spring Koi Deaths: Diagnosing Recurring Losses; Black Spots on a Young Koi: Natural Sumi or Parasites?; Recurring Red Rash on Koi in Overstocked Tank: Parasites, Bacteria, or Stress?; Rescuing Frozen Koi: Oxygen Deprivation in an Overstocked Pond; Mystery Baby Fish in Koi Pond: Spawning Surprise; Koi Disappears from 60-Gallon Pond: Predators or Jump?; Koi Disappearing: Predators or Hiding?; Ghost Koi Color Change After Oxygen Deprivation; Orange Ghost Koi: Unusual Color, Not More Valuable; Tiny Tadpoles in New Pond: Mosquito Larvae or Fish Fry?

Garden Articles

Plants