Metabolism of palmitic, linoleic, and linolenic acids in adult oysters,Crassostrea virginica

Chu, Fu‐Lin E.; Greaves, John

doi:10.1007/bf01313708

Cited by 109 publications

(57 citation statements)

References 33 publications

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“…There were peaks in lipid concentrations in autumn and winter that corresponded with phytoplankton blooms and lipid concentrations increased during gametogenesis and fell during spawning. Interestingly, in this and other studies, there was an inverse relationship between temperature and the amount of fatty acids in the tissues of oysters (Chu & Greaves 1991;Pazos et al 1996). In the present study the lipid reserves in the gonad portion of the mantle fell over the winter of 1999 suggesting that they may have been mobilised to provide energy as the carbohydrate reserves become depleted (Bayne 1976;Barber & Blake 1981).…”

Section: Discussionsupporting

confidence: 64%

Seasonal variation in the reproductive activity and biochemical composition of the Pacific oyster(Crassostrea gigas)from the Marlborough Sounds, New Zealand

Ren

Marsden²,

Ross

et al. 2003

New Zealand Journal of Marine and Freshwater Research

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Reproductive cycles of the Pacific oysterCrassostrea gigas (Thunberg) from the Marlborough Sounds, New Zealand, were followed between June 1998 and January 2000. Histological examination of the gonad confirms an annual cycle with a winter inactive period followed by rapid gonad development and a single short spawning period. The population gonad index correlated with seawater temperature and changes in tissue dry weight, condition index, and biochemical components. In winter, few individuals with early gametogenic stages were present and rapid development of primary oocytes (diam. 11 µm) occurred during spring (September-November). The developmental rate and the diameter of mature oocytes (37 µm) was similar for the 1998 and 1999 seasons. For a standard 110-mm-length oyster, maximal tissue body weight and condition index were recorded in December. Rapid weight loss in January was length dependent and was attributed to spawning. environmental variable which best correlated with the timing of gametogenesis. Food availability (phytoplankton biomass) may have been responsible for inter-annual variations. The biochemical composition (% glycogen, lipid, protein) of separated gonad and somatic tissues were variable seasonally and annually. Gametogenesis (oocyte diameter) was associated with increased gonad protein and glycogen and a decrease in lipid concentrations. These changes are similar to those in Pacific oyster populations from other parts of the world.

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Section: Discussionsupporting

confidence: 64%

Seasonal variation in the reproductive activity and biochemical composition of the Pacific oyster(Crassostrea gigas)from the Marlborough Sounds, New Zealand

Ren

Marsden²,

Ross

et al. 2003

New Zealand Journal of Marine and Freshwater Research

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“…In the past years, bivalves have been regarded as having no or limit ability to biosynthesize n-3 and n-6 long chain PUFAs by elongation and desaturation of the precursors 18:2n-6 and 18:3n-3 [17,29]. Instead bivalves have been thought to obtain the PUFAs from their diets [30,31].…”

Section: Discussionmentioning

confidence: 99%

“…Peaks 1-4 represent the main endogenous FAs of S. cerevisiae, namely C16:0 (1), C16:1n-7 (2), C18:0 (3) and C18:1n-9 (4). The remaining main additional peaks (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) correspond to the exogenously added FAs and the products of their elongation-C18:2n-6 (7), C20:2n-6 (8), C20:3n-6 (9), C22:3n-6 (10), C22:3n-6 (11), C20:4n-6 (12), C22:4n-6 (13), C18:3n-3 (14), C20:3n-3 (15), C20:5n-3 (16) and C22:5n-3 (17). Other minor peaks are 20:1n-9 (5) and 20:1n-7 (6), the latter two resulting from the elongation of 18:1n-9 and 18:1n-7.…”

Section: Functional Characterizationmentioning

confidence: 99%

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Molecular Cloning and Functional Characterisation of a Polyunsaturated Fatty Acid Elongase in a Marine Bivalve Crassostrea angulata

Zhang¹,

Liu²,

Cheng³

et al. 2018

JFNR

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The elongases of fatty acids (ELO) are essential for long chain polyunsaturated fatty acid (LC-PUFA) biosynthesis, and their activities depend on the substrates. The full length cDNA of Crassostrea angulata ELO (CaELO) was cloned by RACE PCR and its function was confirmed. The CaELO encodes a polypeptide of 309 amino acid residues, which containes a histidine box HXXHH motif conserved in all elongases and shares high similarity to the elongases of Chlamys nobilis and Octopus vulgaris. Phylogenetic analysis showed that the putative elongase was placed in the same group with ELOVL2 and ELOVL5, which have been demonstrated to be critical enzymes participating in the biosynthesis of PUFAs in vertebrates. When expressed in Saccharomyces cerevisiae, CaELO was able to elongate n-3 and n-6 PUFA substrates with chain lengths of C18 and C20, indicating that the CaELO had similar substrate specificities to vertebrate ELOVL5. CaELO had lower activity to elongate monounsaturated fatty acids, but had not activity to saturated fatty acids. Interestingly, the conversion rate of PUFAs depended on the length of carbon chain, the number of double bond, and n-3 / n-6 series in the species.

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“…Other researchers [19,20] had reported an inverse relationship between temperature and the amount of polyunsaturated fatty acids in tissue lipids of invertebrates, due to the adaptive regulation of melting point of cellular lipids. It should be noted the difference in the case of internal tissue and foot of Chiton lamyi in this founding, is possibly due to the adaptation of different organs to climatic conditions, such as temperature changes.…”

Section: Discussionmentioning

confidence: 99%

Seasonal Variations of n-6: n-3 Ratios and Fatty Acid Compositions in Foot and Tissue of Chiton lamyi in a High Primary Productivity Area

Sajjadi¹,

Eghtesadi-Araghi²,

Jamili³

et al. 2009

American J. of Environmental Sciences

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Problem statement: Fatty acid content and composition in mollusks is a function of their feeding diversity. Chabahar bay located in the northern part of Oman sea in Indian ocean provides high rates of primary productivity and a diverse food source for mollusks in this area. Identification of fatty acid compositions of Chiton lamyi and study their seasonal changes in the intertidal zone of Chabahar bay. Study the meat quality by n-6: n-3 ratios calculation throughout the year. Approach: Chiton lamyi species analyzed seasonally for its fatty acid compositions in foot and internal tissue separately by GC/MS chromatography. Temperature and nutrients measured monthly for evaluating their effects on investigated seasonal variations of fatty acids. Pearson analysis showed effects of measured environmental factors on studied fatty acids composition. n-6: n-3 ratio calculated seasonally in order to study meat quality. Results: Thirteen fatty acids identified in foot and internal tissue of Chiton lamyi. The major Saturated Fatty Acids (SFAs) were myristic, palmitic and stearic acids. The major MonoUnsaturated Fatty Acids (MUFAs) were palmitoleic, oleic and 11-eicosenoic acids and PolyUnsaturated Fatty Acids (PUFAs) were linoleic, eicosapentaenoic and arachidonic acids. Palmitic acid was the most abundant in this species. Fatty acid contents of foot and internal tissue of Chiton lamyi were similar but their seasonal variations were different. Pearson analysis showed correlation among palmitic and oleic acids with silicate; oleic acid with phosphate; Linoleic and arachidonic acids with nitrate in Chiton lamyi internal tissues, but no correlation observed in foot. Although temperature showed correlation with heptadecanoic and methyl-heptadecanoic acids in Chiton lamyi foot, no correlation found in internal tissues. Also, n-6: n-3 ratio calculations showed domination of n-3 fatty acid over n-6 only in spring. Conclusion: Fatty acid variations were not same at different organs and environmental factors could have opposite effects on them in this species. Also, n-6: n-3 ratio showed the lack of food loads throughout the year except in spring for this species. These findings can lead the best exploitation periods for such marine mollusks.

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Metabolism of palmitic, linoleic, and linolenic acids in adult oysters,Crassostrea virginica

Cited by 109 publications

References 33 publications

Seasonal variation in the reproductive activity and biochemical composition of the Pacific oyster(Crassostrea gigas)from the Marlborough Sounds, New Zealand

Seasonal variation in the reproductive activity and biochemical composition of the Pacific oyster(Crassostrea gigas)from the Marlborough Sounds, New Zealand

Molecular Cloning and Functional Characterisation of a Polyunsaturated Fatty Acid Elongase in a Marine Bivalve <i>Crassostrea</i><i> </i><i>angulata</i>

Seasonal Variations of n-6: n-3 Ratios and Fatty Acid Compositions in Foot and Tissue of Chiton lamyi in a High Primary Productivity Area

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