Saprotroph, also called saprophyte or saprobe, organism that feeds on non-living organic matter known as detritus at a microscopic level .Saprotrophic organisms are considered critical to decomposition and nutrient cycling and include fungi, certain bacteria, and fungus like organisms known as water  (phylum ).Saprotrophs feed by a process known as absorptive nutrition, in which the nutritional substrate (e.g., dead organism or other non-living organic matter) is directly digested by a variety of enzymes that are excreted by the saprotroph. The enzymes convert the detritus into simpler molecules, which are then absorbed by the cells to feed the organism.