I think it is one and the same parasite in different stages of relaxation and contraction. Is this trematode from fresh or marine fish? Are these specimens from one type or different types of fish? Can you give us the name of the fish?
these worms are Trematoda but it is difficult to know with the pictures the genus and the spacies
I think Rokkam Madhavi, from Andhra pradesh, India can give you a little bit of help in this matter. She is such an expert in this feild
I think that the gonads are in the wrong place for O. batrachoides, if one compares the photos with the description given by Fischthal & Kuntz (1963; J. Parasit. 49, 451-463).
Perhaps Dr Karer might have had more responses if he had answered the two requests for host, locality and site data.
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