my fish have leech are maybe some kind of worm on them what can be done?

Answer 1

There's not a lot to go by with the information you provided. Are your fish indoors in a tank, or outside in a pond?

A leech would be long and flat, and attached to the fish by both ends, with one end being larger than the other - see photo: http://mindflight.plymouth.edu/mf98/ecol/leechhand.JPG

Your fish may also have anchorworm: http://www.sera.cz/07/0738b.jpg These only attach to your fish by one end.

Or Argulus (fish lice): (detail): http://www.flickr.com/photos/wontolla_jcb/163074861/ (on a fish): http://www.elacuarista.com/secciones/images/infestacao_%20por_Argulus-sp.jpg

For any of these, using Clout or any strong antiparasitic medication should kill the parasites. In the case of anchorworm, they may not release from the fish, so it will be up to your to remove them if the don't. You'll have to net the fish and use a pair of forceps (tweezers) and grab the worm close to where it's attached to the fish, and pull it off with slow, consistent pressure. Just watch carefully for the next several days that the wound doesn't become infected.

Answer 2

Probably Anchor Worm. Or Flukes.Go To The Pet Store And Buy Parasite Medication.The Bottle Will Usually Say What kind Of Parasites It Treats.