Relation between lipid and
fatty acid composition of eggs and larval survival in white pacific shrimp (Penaeus
vannamei, Boone, 1931)
E.
Palacios, I.S. Racotta, H. Heras, Y. Marty, J. Moal, J.-F. Samain-2001
Aquaculture
International, 9
(6): 531-543
Abstract:
In this study, lipid classes and fatty acid
composition were determined in eggs of P. vannamei as a function of
survival to zoea III stage. Spawns were reared individually to zoea III and
grouped, according to their final survival to this larval stage, into spawns
of high and low survival. Eggs of individual spawns were analyzed for lipid
and fatty acid composition of neutral and polar lipids and the results were
then grouped according to survival to zoea III. The lipids within each group
(high and low survival to zoea III) were pooled for the separation of
phospholipids and the analysis of their fatty acid composition. Higher
levels of triglycerides, carotenoids, and linoleic (18:2n-6) acid in eggs
were associated with improved survival to zoea III. Linoleic acid was higher
in spawns from the high survival group in both neutral and polar fractions
and in most of the phospholipid classes analyzed. Docosahexanoic acid (DHA)
was not related to survival to zoea, probably because its content was high
enough (> 15% of total fatty acids) to
satisfy embryo and early larval development needs. A high content of
eicosapentaenoic acid (EPA) was found in phosphatidylethanolamine,
lysophosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol
compared to other phospholipid classes, suggesting a specific role of EPA in
these lipids. These results describe the specific phospholipid composition
of penaeid eggs and could (potentially) be used as predictive indicators of
larval quality for research and production purposes.
(Centro
de Investigaciones Biológicas
del Noroeste, A.P. 128, La Paz, México,
e-mail :epalacio@cibnor.mx)