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The company Oceana has found that some restaurants in Chicago are serving substitute fish instead of the real thing. 
They found that 30 out of the 92 samples they took from Chicago restaurants were mislabeled.
Eight of the nine red snapper samples turned out to be a different fish entirely.
They also discovered that sushi restaurants were the worst offenders.
None of the yellowtail samples tested was actually yellowtail.
They say American’s are more vulnerable to fish fraud because they usually prefer white-fleshed fish with little taste.
