By Jamie Boyle
Anchor worms ( Crustacean parasite, Lernaea ) are small external parasites often seen on Goldfish, Koi and other types of fish. These anchor worms are small threadlike parasites that you often see them attached to goldfish on the body itself or close to the tail fin or dorsal fin. Once these anchor worms attach themselves to the fish it begins to feed on the goldfish body fluids and can destroy muscle and gill tissue. These external parasites can be seen quite easily seen as they are about 1/4″ long which is about 6-7mm. For this type of parasite you don’t need a microscope to see them at all.
As these parasites feed it can cause secondary bacterial infections to begin. Once you notice your goldfish showing signs and symptoms of anchor worms through flashing and scratching themselves on things you will need to learn how to treat anchor worms on goldfish and begin treatment right away. 
Goldfish will try and rub themselves against anything such as aquarium gravel, aquarium ornaments or decorations to try and rid themselves or knock off these external parasites causing irritation. The good thing with anchor worms is that it’s very easy to treat, just begin treatment right away to eliminate the chance of spreading these parasites to your other goldfish. Anchor worms ( Lernaea ) lay eggs so just so know you will need to treat your entire tank to make sure you rid yourself of Anchor worms. As I say it Anchors Away!
Sincerely,
Jamie Boyle
The Goldfish Guy
Other Related Posts
What Is Anchor Worms?
How To Treat Anchor Worms On Goldfish?