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Mutant strain of Rhizopus oligosporous T"-31 was used for the production of extracellular lipase by solid-state fermentation. Maximum lipase activity (76.69 a ſg) was observed when different nutrients were added to the substrate. Among different carbon sources Tween 80 at 0.5% was found to be the best carbon source. The best organic and inorganic nitrogen sources for lipolytic activity were soybean meal (1%) and ammonium sulphate (0.4%) respectively. Addition of egg yolk to fermentation medium enhanced the lipase production.