My fish have white spots on them. What disease is this?

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Answer

White spots on fish, often referred to as 'ich' or 'white spot disease' (Ichthyophthirius multifiliis), is a common and highly contagious parasitic infection. Other possibilities include fungal infections or external fluke infestations, but ich is the most frequent culprit. If left untreated, it can quickly spread and be fatal. You’ll typically see small, salt-grain-sized white spots covering the body and fins. Prompt treatment is essential; isolate affected fish if possible, raise the water temperature gradually (if suitable for your fish species), and use an appropriate aquarium-safe medication. Speak to Dial A Vet via a video consult should you need further guidance.
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