Case of the Week 557
This week's case was donated by Florida Fan and one of his coworkers who found this beauty in some fresh salmon.
Read Dr. Pritt's blog, Parasite Wonders, and submit your answers, comments, and questions. Also, visit her website ParasiteWonders.com, which hosts an archive of classic images from cases Dr. Pritt has posted going back to 2007 (in an easy-to-search "A through Z" format) and also offers a flashcard feature.
As mentioned by Bernardino Rocha, this is either an L3 larva of the Anisakidae or Raphidascarididae - 2 families of nematodes that are commonly found in fish.