This parasitic worm was found in the body cavity of a fish specimen.
It was 4.5 cm long , coiled and stiffer than earthworm.
Key Eustrongylides - Helminth - Nematode
Maybe the collected specimens parasites are Anisakids (Nematoda), for better identification you must have more morpho-anatomical details (that we can not observe on your photos)....
It looks to be Eustrongylides. What is the scientific name of the host you found the worm?
Yes, this could be a species in the genus Eustrongylides (Family Dioctophymatidae and thus not an Anisakid). The first photo could be the posterior end of a male larvae and the second photo is likely showing the head end. The larvae in the third photo has the size and colour commonly seen for Eustrongylides larvae in fish. You didn't give the name of the fish host but I assume that is was caught in freshwater?
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