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Ghost Koi Color Change After Oxygen Deprivation

Three koi + ghost koi in temp pool; pump failed, 2 koi died, others gasping. After rescue, ghost koi changed from charcoal to mirror scales. Asks if terminal.

Stress-Induced Color Change

Koi change color with stress, health, mood. Scales don't appear/disappear but sheen/color shifts. Acute hypoxia likely triggered this.

Recovery

If new pond conditions are good, color may stabilize. Photo would help assess stress level. Not necessarily terminal.

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 Blamed for Goldfish Wounds—Real Culprit?; Orange Ghost Koi: Unusual Color, Not More Valuable; Tiny Tadpoles in New Pond: Mosquito Larvae or Fish Fry?

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