Leeches (Annelida infestation)

Symptoms

Rubbing/scratching
Fish constantly rubs or scratches itself against any object available.

Visible worms
Body shows very obvious worms (leeches).

Very agitated
Fish rushes around the tank or pond in an abnormal manner.

Bloody lesions on body
Body shows one or more bloody lesions, where leeches have eaten into flesh.

Several species of leeches.

Relatively easy to treat succesfully, although can be somewhat laborious.

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DNA and RNA diagnosis references

Genetic Diversity of Freshwater Leeches in Lake Gusinoe ( Eastern Siberia, Russia)

From   The Scientific World Journal Volume 2014, Article ID 619127, 11 pages.                        Irina A. Kaygorodova, et al.