Mother Bear, don't panic!
It is just the NZ media running out of subjects to report on again. You, me and millions of others have been eating worm-infected fish for years -
Round worms, or nematodes, in larval form are found in the guts and in the flesh of many fish marketed in the United Kingdom; two kinds predominate, the 'cod worm' and the 'herring worm'.
The 'cod worm', which is often found in cod, is also found in many other species. Its scientific name is Phocanema decipiens; other outdated scientific names are Porrocaecum decipiens or Terranova decipiens. It grows up to 4 cm long in fish, and varies in colour from creamy white to dark brown. It is frequently found in the flesh of fish, particularly in the belly flaps, where it often remains for long periods curled up and encased in a sac-like membrane produced by the fish tissue.
(From
http://www.fao.org/wairdocs/tan/x5951e/x5951e01.htm)
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