Question

What are the some functions of long chain Omega-3 fatty acids found in fish?

EPA and DHA Omega 3s are important for many functions, including inflammation.
Every cell in our body is surrounded by a cell membrane composed mostly of fatty acids. This membrane allows the necessary amounts of nutrients to enter the cell and ensures that waste products are quickly removed. EPA Omega 3 is one type of fatty acid involved in this process.
Resolvins help to explain how EPA provides anti-inflammatory effects on our joints and how it improves blood flow. They are a recently identified lipid, or fat, made from EPA by our cellular enzymes. They work by inhibiting the production of, as well as regulating the migration of, inflammatory cells and chemicals to sites of inflammation. Unlike anti-inflammatory drugs such as aspirin, ibuprofen and the COX-2 inhibitors, the resolvins that our bodies produce from EPA do not have negative side effects on our gastrointestinal or cardiovascular systems.

These EPA Omega 3s are only found in fatty fish, shellfish and marine algae.

Source: http://www.whfoods.com/genpage.php?tname=nutrient&dbid=84