Abstract: The White Crucian Carp (Carassius cnvieri T. et S.) is one of the omnivorous fishes, its fingerling feeds mainly on organic detritus and planktons, which include some filamentous algae such as Spiroyyra.A series of tracer experiments using P32 as a tagger and the radioautography had been carried out. The result presented here indicates that Spiroyyra can be ingested, digested and absorbed by the fingerliug of White Crucian Carp. Under conditions of our xperiment, the average feeding capacity of the fingerling of White Crucian Carp fed on Spirogyra is 1.85-4.00% (percentage of food consumed daily to body weight), and its digestive rate is 48.49%.