title: Changes in fatty acid composition of Mytilus galloprovincialis (Lmk) fed on microalgal and wheat germ diets.
abstract: Dietary fatty acid incorporation and changes in various lipid and phospholipid classes in the mussel Mytilus galloprovincialis subjected to three different dietary regimens were analysed and compared. Group A was unfed; group B received a diet consisting of 100% Thalassiosira weissflogii, exhibiting the typical fatty acid composition of diatoms, and group C received a diet consisting of 100% wheat germ conferring a 18:2:n-6 abundance. Biochemical analyses of diets and mussels were carried out at the beginning and at the end of the 30-day experimental period. Starvation and T. weissflogii based diet poorly affected mussel growth and fatty acid composition which remained unchanged. On the contrary, the wheat germ-based diet increased the condition index and deeply affected the fatty acid profile of all lipid and phospholipid classes. The high dietary 18:2n-6 level drastically reduced tissue content of 20:4n-6, 20:5n-3 and 22:6n-3. The biosynthesis of Non Methylene Interrupted (NMI) dienoic fatty acid appeared to be insensitive to the high input of 16:1n-7 and 18:1n-9 respectively from diet B and C, and to the PUFA shortage of diet C. Nevertheless the two NMI trienoic derivatives, 20:3Delta5,11,14 and 22:3Delta7,13 16, were found higher in C with respect to other groups, presumably due to the high 18:2n-6 content of this diet.
authors.affiliation: Dipartimento di Biochimica G. Moruzzi, Sezione di Biochimica Veterinaria, Università di Bologna, Via Tolara di Sopra 50, 40064 Ozzano dell'Emilia (BO), Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Pirini
authors.forename: Maria P
authors.initials: MP
authors.lastname: Manuzzi
authors.forename: Alessandra
authors.initials: A
authors.lastname: Pagliarani
authors.forename: Fabiana
authors.initials: F
authors.lastname: Trombetti
authors.forename: Anna R
authors.initials: AR
authors.lastname: Borgatti
authors.forename: Vittoria
authors.initials: V
authors.lastname: Ventrella
mesh_terms: D000821:Animal Feed; D000818:Animals; D001823:Body Composition; D004041:Dietary Fats / Q000032:analysis; D056890:Eukaryota; D005227:Fatty Acids / Q000032:analysis*; D008055:Lipids / Q000032:analysis; D049878:Mytilus / Q000737:chemistry* / Q000502:physiology; D010743:Phospholipids / Q000032:analysis; D036226:Seedlings; D014908:Triticum
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D008055:Lipids; D010743:Phospholipids