Algal Oil - Definition, Glossary, Details - Oilgae
Algae oils have a variety of commercial and industrial uses, and are extracted through a wide variety of methods.
The simplest method is mechanical crushing. Since different strains of algae vary widely in their physical attributes, various press configurations (screw, expeller, piston, etc) work better for specific algae types. Often, mechanical crushing is used in conjunction with chemicals. Link