The Chilean scallop Argopecten purpuratus (Lamarck, 1819): II. manipulation of the fatty acid composition and lipid content of the eggs via lipid supplementation of the broodstock diet
M. Caers et al., The Chilean scallop Argopecten purpuratus (Lamarck, 1819): II. manipulation of the fatty acid composition and lipid content of the eggs via lipid supplementation of the broodstock diet, COMP BIOC B, 123(1), 1999, pp. 97-103
Citations number
40
Categorie Soggetti
Biochemistry & Biophysics
Journal title
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
Dietary supplementation with lipid emulsions during broodstock conditioning
of Argopecten purpuratus was used to manipulate the fatty acid composition
of the eggs. The scallops were fed a mixed algal diet either alone (Al) or
supplemented with an emulsion rich in ethyl esters of docosahexaenoic acid
(DHA; Al+EmDHA) or eicosapentaenoic acid (EPA; Al + EmEPA) at a concentrat
ion of 50% lipids per algal dry weight (DW). The longer induction period an
d the lower fecundity in scallops fed solely on algae indicated a higher fo
od value for the lipid-supplemented diet compared to the non-supplemented d
iet. Lipid supplementation resulted in a significant increase of the total
lipid content (mg/g DW) of the eggs. The fatty acid quality of the diet had
no significant effect on the fatty acid profile of the polar lipids. Howev
er, the supplementation of the DHA-rich emulsion resulted in a significant
increase of the DHA level (% of total fatty acids) in the total and neutral
lipids of the eggs compared to eggs from scallops fed solely algae. The ab
solute DHA content (mg/g DW) increased by 47%. The EPA level in the total a
nd neutral lipids of eggs from broodstock supplemented with EmEPA was signi
ficantly higher than in eggs from scallops fed Al + EmDHA but no significan
t differences were detected with eggs from the non-supplemented diet (Al).
The absolute EPA concentration in eggs from scallops fed Al + EmEPA was, re
spectively, 19 and 17% higher than in eggs from broodstock fed, respectivel
y, solely algae (Al) or Al + EmDHA. The results illustrated that fatty acid
s, supplied as emulsified ethyl esters, could be ingested and assimilated b
y adult A. purpuratus and were at least partially allocated to the eggs. (C
) 1999 Elsevier Science Inc. All rights reserved.