To get the "reel" thing in concentrate it's as easy as boiling water. Most every living thin on earth contains oil. Determine what sent you are looking for and find the source. If you want herring oil use herring. Get yourself a big pot put your herring in whole, fill the pot with water and boil it. from there just skim the oil off the top. Don't burn it. The oil you get will be very concentrated. Mix this oil good light vegetable oil and a small amount of WD40 and fish. A little time consuming but well worth it worth it. I have used this method to extract oil from a number of different species. The amount of oil you get will vary dipending on a number of factors.