title: Effect of unialgal diets on the composition of fatty acids and sterols in juvenile ark shell Tegillarca granosa Linnaeus.
abstract: This study has investigated the effects of six different unialgal diets ( Chaetoceros calcitrans ,  Platymonas helgolandica ,  Chlorella  sp.,  Isochrysis galbana ,  Nannochloropsis oculata , and  Pavlova viridis ) on the composition of fatty acids and sterols in juvenile ark shell  Tegillarca granosa  Linnaeus. The best feeding effects on the growth of shellfish were found in C. calcitrans, followed by I. galbana and P. viridis, whereas Chlorella sp. and N. oculata exhibited relatively poor effects. The fatty acid and sterol compositions in the six microalgae and the juvenile ark shell after feeding were analyzed, and 39 fatty acids and 18 sterols were identified. Although the results demonstrate a close correlation between the sterol compositions in algal species and juvenile ark shell, a similar correlation was not observed between fatty acids. In the juvenile ark shell fed microalgae, the ratio of total saturated fatty acids (SFA) rapidly decreases, whereas the proportion of total polyunsaturated fatty acids (PUFAs) increases considerably. The abundances of AA, EPA, and DHA increase most significantly in shellfish with better growth (fed C. calcitrans, I. galbana, and P. viridis). The number of sterol species is reduced, but the total sterol content in groups fed corresponding microalgae increases, and abundant plant sterols, instead of cholesterol, are accumulated in juvenile ark shell fed appropriate microalgae I. galbana and P. viridis. Therefore, to be more conducive to human health, I. galbana and P. viridis, of the six experimental microalgae, are recommended for artificial ark shell culture.
authors.affiliation: Key Laboratory of Applied Marine Biotechnology, Ningbo University , Chinese Ministry of Education, Ningbo, China.
authors.forename: Jilin
authors.initials: J
authors.lastname: Xu
authors.forename: Haibo
authors.initials: H
authors.lastname: Zhou
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Yan
authors.forename: Chengxu
authors.initials: C
authors.lastname: Zhou
authors.forename: Peng
authors.initials: P
authors.lastname: Zhu
authors.forename: Bin
authors.initials: B
authors.lastname: Ma
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D049893:Arcidae / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D005227:Fatty Acids / Q000032:analysis* / Q000378:metabolism; D058086:Microalgae / Q000737:chemistry*; D012758:Shellfish / Q000032:analysis*; D013261:Sterols / Q000032:analysis* / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D013261:Sterols