Articulo De Nutricion

Oily fish
Oily fish (oil-rich fish, pelagic fish) are those fish which have oils throughout the fillet and in the belly cavity around the gut, rather than only in the liver like white fish.

Oilyfish generally swim in mid-waters or near the surface (the pelagic zone).
Oily fish are a good source of Vitamins A and D as well as being rich in Omega 3 fatty acids.
For this reason theconsumption of oily fish has been identified as more beneficial to humans than white fish.
Amongst other benefits, studies suggest that the Omega 3 fatty acids in oily fish may help sufferers of depression,reduce the likelihood of heart disease and improve inflammatory conditions such as arthritis.
However, oily fish are predators, high up in the food chain, and thus more likely to contain toxicsubstances than white fish.

Omega-3 fatty acids are considered essential fatty acids: They are necessary for human health but the body can' t make them -- you have to get them through food. Omega-3 fattyacids can be found in fish, such as salmon, tuna, and halibut, other seafood including algae and krill, some plants, and nut oils. Also known as polyunsaturated fatty acids (PUFAs), omega-3 fattyacids play a crucial role in brain function, as well as normal growth and development. They have also become popular because they may reduce the risk of heart disease. The American Heart Associationrecommends eating fish (particularly fatty fish such as mackerel, lake trout, herring, sardines, albacore tuna, and salmon) at least 2 times a week.
Research shows that omega-3 fatty acids reduceinflammation and may help lower risk of chronic diseases such as heart disease, cancer, and arthritis. Omega-3 fatty acids are highly concentrated in the brain and appear to be important for cognitive (brainmemory and performance) and behavioral function.

 http://www.umm.edu/altmed/articles/omega-3-000316.htm/#ixzz22S0o96pW
http://www.sciencedaily.com/articles/o/oily_fish.htm
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