Which parasite is referred to as 'Anchorworm' in fish?

The term 'Anchorworm' refers specifically to the larval stage of a type of crustacean, scientifically known as Lernaea, which is classified under the category of copepods. While 'Anchorworm' can be misleading, as it sounds like it might belong to a group traditionally characterized as worms, it is important to note that this organism is not a worm in the traditional sense.

Among the choices provided, the classification of trematodes, typically known as flukes, does not apply to the Anchorworm. Anchorworms are parasites that attach to fish and can cause significant harm, while trematodes primarily target different hosts and have a different lifecycle and morphology.

Cestodes, or tapeworms, are also distinct from Anchorworms, as they are flatworms that grow in the intestines of their hosts and do not exhibit the anchor-like attachment behavior seen with Lernaea. Nematodes, classified as roundworms, likewise do not fit the profile for Anchorworms.

Hence, recognizing that 'Anchorworm' refers to a specific larval form of a copepod and understanding its pathology helps clarify that it does not align with the trematode group, nor any significant aspects of other parasite classifications in this context