Oily fish

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Oily fish is the name for several species of fish which have a lot of fat (and oil) in their muscle tissue. Oily fish commonly have ten percent or more fat/oil in their tissue. Some species have over 30%. The other kind of fish is called whitefish: Whitefish only contain oil/fat in tissues around the liver. Common fish that are called oily include Atlantic herring, European sprat, salmon, Atlantic mackerel, tuna, eel, Greenland halibut and different species of catfish.