It's about 3 cm long

Dear Majid,

You can use the symbol "@" to invite the specialists in fish parasitology to obtain fast answers because this is a very specific task and not every one can contribute or help with it.

Regards

SM Najim

How can I start firstly. ...@

Just put the symbol @ at the beginning of the line and mention the name after it directly without a space. Use another line to add another name in the same way. It is similar to mention in facebook.

Regards

@David Ian Gibson

You can apply to the Institute of Parasitology ,Academy of Sciences of the Czech Republic.Several years ago Aneta Kostadinova ,she did research work on Digenean parasites.

Thanks Rita for your comment. ..you have central of fish health. ..can you send me your website on my mail. ..

[email protected] 

http://www.moag.gov.il/en/Ministrys%20Units/Fishing%20and%20Aquaculture%20Division/Pages/Activity%20of%20the%20division.aspx

Thanks Rita 

Dear Majid, your (broken) specimen is an adult digenean. Probably of the family  Didymozoidae. It is a group very hard to deal with, also with many Undescribed species. You have to check very carefully all morphological features. Consider also that many species are host specific. Tunas are often definitive hosts for this family.

Jacopo is likely right. This is probably a didymozoid, but one would need to know the host species (usually scombroids) and the site to even make a guess as to its identity. 

The most recent key, down to the generic level, is:

Pozdnyakov, S.E. & Gibson, D.I. (2008) Family Didymozoidae Monticelli, 1888. In: Bray, R.A., Gibson, D.I. & Jones, A. [Eds] Keys to the Trematoda. Vol. 3. Wallingford: CAB International, pp. 631-734.

David Gibson

Thanks  Dr Gibson and Jacopo .for identification of this parasite. The parasites collegeted from marine fish parasite of Arabian gulf.in the mouth cavity. .of ..Platax teira fish  can please if any one have this paper provide it to me (new didymozoid trematodes (Platyhelminthes, Digenea) from Australian platycephalid fishes)

Authors

GLENN R. ANDERSON,

THOMAS H. CRIBB

OK, I guess (and I mean guess) that it might be a species of Multtubovarium, which have been recorded from ephippid fishes and also from the head region, but you would likely need more material, including whole specimens to determine this.

I'll send you the Anderson & Cribb paper.

DIG

Can I send new collect specimens to you for identification. And publishe if anew so. Parasite

Regards 

Sorry, Dr Bannai, I have been retired for 11 years and am no longer active in this field.

Regards

David Gibson

Thanks a lot 

Dear Dr. Gibson,

Your book, Keys to the Trematoda is a valuable contribution to taxonomy of trematodes. However, the book is not available in our library. 

I wonder if you could guide me from where it will be available

Regards

Neelima Gupta

The three volumes are available from, CABI.

http://www.cabi.org/bookshop/search-1/?q=Keys+to+the+trematoda

Kind regards

David Gibson

I guess that it might be a taenia

You don't find Taenia in fish.

I have collected the didymozoid Multtubovarium from the same fish species, same localisation, from off New Caledonia. The material was identified by Rod Bray. The photographs of my material ressemble these photographs.

It seems, however, that nobody wants to work on the systematics of didymozoids...

 Dr. Salvatore Mele is currently involved in this field

Cestod parasites are Possible to easily diagnosed through some specialties in the body of the parasite and the overall shape is very different from digenea parasites. ...not just in its host .....

@Salvatore Mele

Dear Majid,

I have seen your pictures of the anterior part of a probably very large digenean. I agree with the previous comments of Jacopo, Mr. Gibson to procede carefully with the identification. I think that this parasite is a Didymozoidae. Following Key of Trematoda v.3: according to the the presence of incomplete hermafroditisme (in this case we have a "female") and ventral sucker (it seems to be one close to the base of "neck") it could belong to the tribe Koellikeriini and perhaps to the genus Multtubovarium as Mr Justine suggested. I suppose that he refers to the specimens of the upper row in his photo, whereas the others are different growing mature Didymozoiini (Indydimozoon?). However, one should bear in mind that without the collection of a "male" paired with it, this specimens could be a complete hermaphroditic parasite of the tribe Allonematobothriini which includes also the Helicodidymozoon spp. of platycephalid fish. Unfortunately, to complete the identification one should have the whole specimen (or a least the anterior portion including genital junction) to observe the ovary and vitellogenous branches and uterus loops. However, the analysis of nuclear DNA may help you.

There is a small network of scientist, including Drs. Kostadinova A and Montero FE, that is investigating the didymozoid richness in the Mediterranean fish.

Regards

Salvatore

i need copy of page 706 -720 about (Helicodidymozoonof ) parasite Keys to the Trematoda, Volume 3

edited by David Ian Gibson, Rodney Alan .

  Dr   Salvatore Mele Thanks for this detailed explanation on the question of the very useful for me .

This is probably a didymozoid