What is Oily fish?
'''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]]. {{biology-stub}} [[Category:Fish]]