 Argulus another crustacean parasite, round
and up to 1cm wide. They have a sucker to hold on to the Koi with needle-like mouth
parts which they stick into the Koi and inject a toxin. This causes intense
irritation to the Koi and they scratch and jump and can cause bacterial infection.
If they infect the gills they cause severe damage and often death. Most
antiparasite remedies will not kill fish lice, a strong chemical is needed which is
not freely on sale. Ask a professional dealer or vet.
Available remedies:
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