Also called injury, wound, fin nipping, bite
Unknown for now.
Trauma, including injuries from spawning activity, fighting and handling/transport (e.g. netting).
Remove the cause and keep water very clean. Watch for white cottony growth (water mould, Saprolegnia) or red ulcers: wounds are often invaded by fungi and bacteria, and these lesions usually keep growing and can kill unless treated, so see a vet or treat promptly if they appear.
If a fish is badly ill, talk to an aquatic vet.
Good sanitation and water quality, and minimising handling stress.
Always read the label first
3 facts checked with sources
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