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

Vulnerable populations of rainbow trout are also threatened by the Eaton fire burning in the San Gabriel Mountains north of Los Angeles.

At the same time, China's efforts to produce its own Atlantic salmon have faced significant challenges, highlighting the need for substitutes like rainbow trout to meet the country's growing appetite for seafood delicacies.

Several examples of mislabelling involved substituting an expensive product for a cheaper species: tilapia for snapper, rainbow trout for Atlantic salmon.

“I thought, was that a salmon or maybe it was a very large rainbow trout?”