This book comprises methods from various biochemical disciplines applicable to filamentous fungi. They have been either developed or implemented at IMI where they have been tested thoroughly. The procedures can be used to (a) provide potentially bioactive metabolites (e.g. mycotoxins, antibiotics), (b) detect other properties of economic importance (e.g. citric acid production) and (c) provide diagnostic characters. The tests range from simple agar based tests (e.g. inhibition, utilization) to more sophisticated chromatographic and electrophoretic methods (e.g. TLC, HPLC, isozymes, RFLP, etc.). The book is intended for advanced students, research workers, and laboratory practitioners in colleges, academia and industry.