Fish Health » Disease » Anchorworm (Lernea)

Anchorworms resemble a short piece of thread coming from beneath a single scale. Koi infected with Anchorworms very often develop ulcer sores due to the damage caused by the worms as they bury into the flesh of the fish. Be aware that anchor worms will not disappear immediately. The treatment may take a week or longer, according to the water temperature.

Use treatment #4.