 These wax esters, which are monounsaturated, are very similar to sperm oil.Marine organisms like dinoflagellates, pelagic invertebrates, and fishes store low-density wax esters in their swim bladders or other tissues to provide buoyancy.Wax esters "per se" are a normal part of the diet of humans as a lipid component of certain foods, including unrefined whole grain cereals, seeds, and nuts.