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According to Wikipedia, 'anasakis' is " a genus of parasitic nematodes, which have a life cycle involving fish and marine mammals." It causes 'anisakiasis'. What this means is that raw fish may be infected with worms (called anisakis) which cause incredibly abdominal pain and allergic reactions (called 'anisakiasis) to humans unfortunate enough to ingest them. I'm never eating sushi again...
Apparently the only way to ensure that the parasites are killed is to deep freeze the fish, or cook it thoroughly. Pickling, marinating and lightly salting does not affect the creatures: they can survive to cause you plenty of discomfort. So be cautious of sashimi, sushi, ceviche, and any other form of raw fish. Sardines, herrings, and salmon seem to be particularly affected.
This is one occasion where you may choose not to insist on wild salmon, because it is more likely to be infected than farmed.