Filamentous Fungi - Filamentous fungi have been used to produce SCP mainly from polysaccharide hydrolysates, e.g., starch hydrolysates, sulphite liquor from wood pulp industries, etc. These are usually grown as submerged cultures in which they grow as yeast like cells, in filamentous form or in pellets.

They have crude protein content of 50-55%; the protein is low in S containing amino acids, but otherwise is excellent in amino acid composition. The recovery of filamentous and pellet forms is rather easy by filtration.

The problems associated with fungi are:
(i) slower growth rates than bacteria and yeast, but some microfungi may be comparable to yeast,