TECHNOLOGY FOCUS - BIOLOGY - Preferred Method: The method further uses a second algal strain. The method further comprises: converting oil extracted from the first algal strain into a hydrocarbon fraction and refining the hydrocarbon fraction to produce one or more subfractions enriched in medium chain length hydrocarbons, enriched in carbon chain lengths C8, C10, C12, C14, or C16; and producing kerosene from the fractions. The method comprises: culturing one or more of Nannochloropsis strain LARB-AZ 0202.0 (ATCC Deposit Number PTA-11048), LARB-AZ 0202.2 (ATCC Deposit Number PTA 11049), LARB-AZ 0202.3 (ATCC Deposit Number PTA-11050), under conditions suitable to promote the production of the first medium chain length fatty acid subset; culturing one or more further algal strains under conditions suitable to promote the production of a second medium chain length fatty acid subset comprising at least 50% C10 or C14 chain length fatty acids or hydrocarbons and at least 50% C10 or C12 chain length fatty acids or hydrocarbons, where at least 20% of the fatty acids in the subset are medium chain length fatty acids, and the culturing is conducted under conditions suitable to promote the production of the second medium chain length fatty acid subset; extracting oil from the cultured Nannochloropsis strain LARB-AZ 0202.0 or its mutant and the further algal strains to produce a medium chain length combination, where the medium chain length combination comprises carbon chain length C16, C14 and one or more of C10 and C12 fatty acids or hydrocarbons; converting the medium chain length combination into a hydrocarbon fraction and refining the hydrocarbon fraction to produce one or more fractions enriched in medium chain length hydrocarbons, where the fractions comprise one or more fractions enriched in carbon chain length C10, C12, C14, and C16 hydrocarbons. The first algal strain and the further algal strains are cultured as separate cultures, or cultured together as a co-culture. The medium chain length combination is prepared by combining oil extracted from the Nannochloropsis strain LRB-AZ 0202.0 or its mutant and the further algal strains after oil extraction from a culture comprising both the Nannochloropsis strain LRB-AZ 0202.0 or its mutant and the further algal strains. The method further comprises coculturing a second algal strain to produce a second medium chain fatty acid subset, which is different from the first medium chain fatty acid subset. At least one of the algal medium chain fatty acid subsets is isolated from any one of the organisms comprising the strains (A). The method further comprises converting the medium chain length fatty acid subsets into one or more hydrocarbon fractions comprising a deoxygenation/hydroxylation step, and blending the hydrocarbon fractions to generate refined oils enriched with two or more hydrocarbons of specific carbon chain lengths consisting of C8, C10, C12, C14, and C16, where the two or more hydrocarbons of specific chain lengths are C10 and C12, C12 and C14, C10 and C14, or C8 and C10. At least one of the medium chain fatty acid subsets is isolated from Nannochloropsis sp. or its mutants. Preferred Components: The first and second algal strains are strains (A) comprising Nannochloropsis strain LARB-AZ 0202.0 (ATCC Deposit Number PTA-11048), LARB-AZ 0202.2 (ATCC Deposit Number PTA 11049), LARB-AZ 0202.3 (ATCC Deposit Number PTA-11050), Nannochloropsis sp., Pinguiococcus pyrenoidosus, Aphanocapsa sp., Biddulphia aurita, Crypthecodinium sp. , Emiliania huxleyi, Nitzschia alba, Prymnesium parvum, Skeletonema costatum, or Trichodesmium erythraeum. The further algal strains comprise at least a second algal strain and a third algal strain comprising the strains (A) that is different from the first and second algal strains. The mutant of Nannochloropsis strain LRB-AZ 20202.0 is a LRB-AZ 0202.2 deposited at ATCC Deposit Number PTA-11049 or a LRB-AZ 0202.3 deposited at ATCC Deposit Number PTA-11050. The Nannochloropsis strain or its mutant is grown in a cell culture that comprises 1.5 g/l of sodium nitrate and at a light intensity of 350 mu ole photons m-2s-1, and initial nitrogen gas concentration of the cell culture of 0.01 g/l.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The fractions further comprise one or more subfractions enriched in carbon chain length C16. The second medium chain fatty acid subset comprises C8, C10, C12, or C14 fatty acids. At least one of the medium chain length fatty acid subsets comprises at least 5% of total dry cell weight. The hydrocarbon fraction comprises at least 50% C16 chain length hydrocarbons. The refined oil is kerosene comprising a distribution of 8-16C, 10-16C, 8-14C, or 10-14C hydrocarbons. The medium chain length fatty acid subset comprises at least 60% C16 fatty acids. The oil is enriched for C16 fatty acids such that greater than 60% of the fatty acids in the oil are C16 fatty acids. EXAMPLE - No suitable example given.