MSD Manual

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Common Signs of Illness in Fish

Common Signs of Illness in Fish

  • Lethargy

  • Not eating

  • Slow or rapid breathing

  • Loss of color

  • Discoloration or splotchiness

  • Spots

  • Scars

  • Ulcers (open sores)

  • Loss of scales

  • Scales sticking out or standing up

  • Swelling or bloating

  • Weight loss

  • Floating, drifting, or swimming erratically in unusual positions

  • Tumors and cystic growths

  • Puffy and/or fuzzy growths