Oily fish: Oily fish is a category of food in dietetics. Only fatty fish living in cold waters are rich in omega-3s. These are mainly: anchovy, herring, mackerel, sardines, salmon, tuna and trout. These fish do not manufacture fatty acids themselves: they assimilate them from their food (especially algae), which explains why farmed fish contain less omega-3.
These fish contain about 7 times more ...
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