Oily fish have oil in their tissues and in the belly cavity around the gut. Their fillets contain up to 30 percent oil, although this figure varies both within and between species. Examples include small forage fish, such as sardines, herring and anchovies, and other larger pelagic fish, such as salmon, trout, ilish and mackerel.
Oily fish can be contrasted with whitefish, which contain oil only in the liver, and much less overall than oily fish. Examples of whitefish are cod, haddock and flatfish. Whitefish are usually demersal fish which live on or near the seafloor, whereas oily fish are pelagic, living in the water column away from the bottom.
Oily fish are a good source of vitamins A and D, and are rich in omega-3 fatty acids (whitefish contain the same nutrients but at a much lower level). For this reason the consumption of oily fish rather than whitefish can be more beneficial to humans, particularly concerning cardiovascular diseases, but oily fish are known to carry higher levels of contaminants (such as mercury or dioxin) than whitefish. Amongst other benefits, studies suggest that the Omega 3 fatty acids in oily fish may help improve inflammatory conditions such as arthritis.
Read more about Oily Fish: Recommended Consumption, Omega-3 Content
Famous quotes containing the word fish:
“In communist society, where nobody has one exclusive sphere of activity but each can become accomplished in any branch he wishes, society regulates the general production and thus makes it possible for me to do one thing today and another tomorrow, to hunt in the morning, fish in the afternoon, rear cattle in the evening, criticize after dinner, just as I have a mind, without ever becoming hunter, fisherman, shepherd or critic.”
—Karl Marx (1818–1883)