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"We were like sardines in the dark," one passenger described the moment their underground train stalled.

Domoic acid is a neurotoxin produced by harmful algal blooms that accumulates in filter-feeding fish, including anchovies and sardines.

"They get huge volumes of cod liver oil, lard, salmon oil and get oily fish like sardines, mackerel and salmon."

Foods high in vitamin D include fatty fish like salmon, sardines, freshwater rainbow trout, fortified dairy products and egg yolks.

"They gave us rotten food – meat scraps like you would give to chickens or dogs or sardines that had already expired."