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Energy vs. essential fatty acids: what do scallop larvae (Argopecten purpuratus) need most?
Nevejan, N.; Saez, I.; Gajardo, G.; Sorgeloos, P. (2003). Energy vs. essential fatty acids: what do scallop larvae (Argopecten purpuratus) need most? Comp. Biochem. Physiol. (B Biochem. Mol. Biol.) 134(4): 599-613. http://dx.doi.org/10.1016/S1096-4959(03)00020-4
In: Comparative Biochemistry and Physiology. Part B. Biochemistry and Molecular Biology. Pergamon: Oxford. ISSN 1096-4959; e-ISSN 1879-1107, more
Peer reviewed article  

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Keywords
    Biological phenomena > Metamorphosis
    Chemical compounds > Organic compounds > Hydrocarbons > Saturated hydrocarbons
    Chemical compounds > Organic compounds > Lipids
    Cultures > Shellfish culture > Mollusc culture > Scallop culture
    Argopecten purpuratus (Lamarck, 1819) [WoRMS]; Dunaliella tertiolecta Butcher, 1959 [WoRMS]
    Marine/Coastal

Authors  Top 
  • Nevejan, N., more
  • Saez, I.
  • Gajardo, G.
  • Sorgeloos, P., more

Abstract
    Larvae of the Chilean-Peruvian scallop Argopecten purpuratus were fed a Dunaliella tertiolecta diet (Dun-diet) supplemented with lipid emulsions, rich in 20:5n-3 (EmEPA), 22:6n-3 (EmDHA) or in saturated fatty acids (EmCOCO). A mixed algal diet of Isochrysis galbana (T-iso) and Chaetoceros neogracile served as a positive control (St-diet). Lipid supplementation to the Dun-diet improved the larval growth and increased the percentage of eyed larvae significantly, compared to the non-supplemented Dun-diet because of the extra energy supplied and not because of its fatty acid composition. No significant differences were observed between supplementation with EmEPA, EmDHA or EmCOCO. A mixture of 20% EmEPA+20% EmDHA (40% EmHUFA) was more efficient in raising the total lipid content in larvae than 40% EmCOCO. Both emulsions increased the triacylglycerol content in larvae compared to the non-supplemented Dun-diet. The best result, however, was obtained with the St-diet, probably because of a more suitable 18:2n-6/18:3n-3 ratio and a higher level of arachidonic acid. A positive relationship between the 18:2n-6/18:3n-3 ratio and the larval performance was found. No significant difference was observed in post-settlement larval size or percentage of metamorphosed larvae between the St-diet and the St-diet supplemented with 20% EmHUFA or 20% EmCOCO. The metamorphosed larvae had a constant DHA/EPA ratio of 3.7, independent from the diet, which suggested a metabolic control of the two fatty acids and a species-dependency of the ratio.

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