NOVELTY - The recovery method comprises developing an invertebrate animal culture such as a brine shrimp culture on a high or low oil content algal feedstock biomass, harvesting the invertebrate animal culture, extracting natural lipids from the invertebrate animal culture, and adding a stream containing nutrients to the algal feedstock biomass. The stream is derived from wastewater and flue gas. The invertebrate animal culture is maintained at a pH of 8-10, and at a density range equivalent to 1000-10000 adult animals per liter prior to harvest. The algal feedstock comprises multiple algae species.    USE - The method is useful for recovering lipids from a renewable natural resource, where the natural lipids and the harvested animal culture biomass constituents are useful to produce biodiesel (all claimed).    ADVANTAGE - The method ensures low cost, simple and rapid recovery of high percentage of lipids from the renewable natural resource thus providing efficient production, conversion and recovery of oils.    DETAILED DESCRIPTION - The recovery method comprises developing an invertebrate animal culture such as a brine shrimp culture on a high or low oil content algal feedstock biomass, harvesting the invertebrate animal culture, extracting natural lipids from the invertebrate animal culture, and adding a stream containing nutrients to the algal feedstock biomass. The stream is derived from wastewater and flue gas. The invertebrate animal culture is maintained at a pH of 8-10, and at a density range equivalent to 1000-10000 adult animals per liter prior to harvest. The algal feedstock comprises multiple algae species. The harvested invertebrate animal culture is wet-ground in a solution comprising an organic extraction solvent or dry-ground at ambient temperature for less than 5 minutes, and grinded to form proteinaceous sludge (42). The natural lipids are extracted from the ground proteinaceous sludge. The proteinaceous sludge is digested, and a hydrocarbon gas formed during the step of digesting is collected. INDEPENDENT CLAIMS are included for:    (1) a system for recovering lipids from a renewable natural resource; and    (2) a brine shrimp culture.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a system for converting solids separated from the harvested biomass into a hydrocarbon fuel.    Proteinaceous sludge (42)    Container (44)    Barrel (48)    Mixer (50)    Shredded paper (52)    Waste paper. (54)