You need a book "key to parasites of freshwater fish of the USSR" .The author I.E.Bykhovskaya-Pavlovskaya.This book is old but excellent!

You con find your cestoda identification online in the electronic site

For Digeneans its difficult to find on line>> you should see

1- Bray, R.a.; Gibson, D.I. & Jones, A. (2008). Keys to the Trematoda, Vol. 3. CAB International, Wallingford: 824 pp.

2- Gibson, D.I.; Jones, A. & Bray, R.A. (2002). Keys to the Trematoda, Vol. 1. CAB International. Wallingford: 521pp.

3-Jones, A.; Bray, R.A. & Gibson, D.I. (2005). Keys to the Trematoda, Vol.2. CAB International, Wallingford: 745pp.

If you can't buy then read online via Google books.

If you have done good drawings or pictures, send to my mail with information about fish host scientific name and site of infection

Najim R. Khamees, Ph. D.

Fish Parasitologist

Department of Fisheries and Marine Resources

College of Agriculture, University of Basrah

Iraq

Thank you so much for your help.