title: Variation in lipid classes and fatty acid composition of salmon shark (Lamna ditropis) liver with season and gender.
abstract: The influence of season and gender on lipid content, lipid classes, and fatty acid compositions was assessed in livers of salmon shark (Lamna ditropis), caught in the Pacific Ocean. No significant difference in the hepatosomatic index was noted with season, though the lipid content was significantly higher (P<0.05) in winter. Triacylglycerol (TAG) was identified as the predominant lipid class (78.5-82.0%), followed by sterol esters (5.7-9.1%) and hydrocarbons (3.4-5.4%). No significant differences were observed in TAG composition with respect to the season or gender. However, diacylglyceryl ether contents were significantly higher (P<0.05) in winter (3.8-5.3%) than those obtained in summer (1.3-1.1%). Polyunsaturated fatty acids constituted the major fatty acid class of salmon shark total liver lipid and docosahexaenoic acid (C22:6n-3) (22.7-28.4%) was the most abundant fatty acid which was significantly lower (P<0.05) in winter. These results suggested that lipid characteristics of salmon shark liver were influenced by season, but not by gender.
authors.affiliation: Department of Food Science and Technology, Tokyo University of Fisheries, 4-5-7, Konan, Minato-ku, Tokyo 108-8477, Japan.
authors.forename: Chamila
authors.initials: C
authors.lastname: Jayasinghe
authors.forename: Naohiro
authors.initials: N
authors.lastname: Gotoh
authors.forename: Shun
authors.initials: S
authors.lastname: Wada
mesh_terms: D000818:Animals; D001823:Body Composition; D004641:Emigration and Immigration; D005227:Fatty Acids / Q000032:analysis* / Q000737:chemistry; D005260:Female; D008055:Lipids / Q000032:analysis* / Q000737:chemistry; D008099:Liver / Q000737:chemistry*; D008297:Male; D010140:Pacific Ocean; D012621:Seasons; D012727:Sex Characteristics; D012754:Sharks; D014280:Triglycerides / Q000737:chemistry
chemical_list: D005227:Fatty Acids; D008055:Lipids; D014280:Triglycerides