You are talking about this fish pictured below, right, Suzhou Agricultural Vocational and Technical College of the expert Xu Liang, he said the head and guts of the cod in the factory in addition to the head, because the head of the fish calcium is more, can be used to make fishmeal, guts are used to refine fish oil, so that the utilization rate is higher. No head of cod can be eaten without fear. But some businesses will use a cheap oil fish to pretend to be cod, the public should beware.