The present invention relates to processes for the isolation of a phospholipid and for producing a polyunsaturated, long-chain fatty acids (PUFA)-enriched fraction from a fish oil comprising the steps of —providing a fish oil containing lipids and phospholipids; —mixing the fish oil with a polar solvent; —centrifuging the mixture of the fish oil and the polar solvent to separate a polar fraction from a lipid fraction; —isolating a phospholipid from the polar fraction or isolating a PUFA-enriched fraction from the polar fraction. The fish oil may be provided by —extracting a fish material with an extractant solvent; —removing the extractant solvent to provide the fish oil; —optionally subjecting the fish oil to a solid-liquid separation. The isolated phospholipids and PUFA's may be used as additives for functional foods, as a dietary supplement and for pharmaceutical application.