Parasitologist Ann Adams shares her expertise (see below) on the topic. Thank you, Ann!
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Pamela Tom - I am on the road.
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These are not nematode larvae (and therefore not Anisakis). They appear to be cestode (tapeworm) larvae. The magnification isn't high enough to do much more in the way of identification. If these are larvae of say, Diphyllobothrium, there is a potential for infection of people, depending on the species.
However, there are many species of tapeworm which are not infectious to humans and if these larvae are one of those, then the infection here becomes an aesthetic and not a health issue.
Whatever feeds on skipjack tuna in the oceans may be the final host for these larvae.
Ann
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