Biological oils and production and uses thereof

A method for producing a biological oil comprising

• (a) growing an oil-producing microorganism of the kingdom Stramenopile by heterotrophic fermentation in a medium comprising cellulose as a carbon source, and
• (b) isolating or purifying the biological oil made in step (a);
• wherein about 11% to about 99% of unsaturated fatty acids in said biological oil are polyunsaturated fatty acids, and wherein said fermentation is performed in a fermentor selected from the group consisting of fiber reinforced polymer fermentors, metal matrix composite fermentors, ceramic matrix composite fermentors, thermoplastic composite fermentors, metal fermentors, epoxy lined carbon steel fermentors, plastic lined carbon steel fermentors, plastic fermentors, fiberglass fermenters, and concrete fermentors.