Function and metabolism
Variation of fatty acid composition
of Crassostrea gigas cultured with a new
procedure using Skeletonema costatum
Fréderique Piveteau
(1) Jean-Pierre Baud (2) , Michel Demaimay (1)
(1) Enitiaa, laboratoire de biochimie mdustrielle et alimentaire, BP 82225,
44322 Nantes Cedex 03, France - piueteau@enitiaa-nantes.fr
(2) Ifremer Bouin, station expérimentale, polder des champs, 85230 Bouin, France
Microalgae have an important role in mariculture as food for larval
stages of crustaceans and fish, for all stages of bivalves and as food for
zooplankton. To supply microalgae to oysters is the best way to improve
their growth performance.
Since several years, study was devoted to the consequence of microalgae
supply to oyster’s larvae and juveniles, particularly of diatoms supply.
Recently, Baud (1995) establishes that Skeletonerna costatum supply
greatly improves condition index of oysters. However, this practice
could affect the oyster quality because parameters as fatty acid composition are largely affected by dietary fatty acids.
Skeletonema costatum present a typical fatty acid composition with high
20:5 (n-3) content and characteristic C16 PUFAs. Fatty acid composition of oyster’s tissues was observed to reflect largely fatty acid composition of Skeletonema costatum. The 20:5 (n-3) and 06 PUFAs were
assimilated from microalgae into oyster’s lipids. On other hand, the
low content of 18:2 (n-6), 20:4 (n-6) and 22:6 (n-3) was presumably
associated with a low intake of the fatty acids, since they were minor
in Skeletonerna costaturn.
PUFAs could affect the quality of oysters fed Skeletonema costatum since they
are highly unsaturated and therefore very sensitive to oxidation.
183
Variation of fatty acid composition
of Crassostrea gigas cultured with a new
procedure using Skeletonema costatum
Fréderique Piveteau
(1) Jean-Pierre Baud (2) , Michel Demaimay (1)
(1) Enitiaa, laboratoire de biochimie mdustrielle et alimentaire, BP 82225,
44322 Nantes Cedex 03, France - piueteau@enitiaa-nantes.fr
(2) Ifremer Bouin, station expérimentale, polder des champs, 85230 Bouin, France
Microalgae have an important role in mariculture as food for larval
stages of crustaceans and fish, for all stages of bivalves and as food for
zooplankton. To supply microalgae to oysters is the best way to improve
their growth performance.
Since several years, study was devoted to the consequence of microalgae
supply to oyster’s larvae and juveniles, particularly of diatoms supply.
Recently, Baud (1995) establishes that Skeletonerna costatum supply
greatly improves condition index of oysters. However, this practice
could affect the oyster quality because parameters as fatty acid composition are largely affected by dietary fatty acids.
Skeletonema costatum present a typical fatty acid composition with high
20:5 (n-3) content and characteristic C16 PUFAs. Fatty acid composition of oyster’s tissues was observed to reflect largely fatty acid composition of Skeletonema costatum. The 20:5 (n-3) and 06 PUFAs were
assimilated from microalgae into oyster’s lipids. On other hand, the
low content of 18:2 (n-6), 20:4 (n-6) and 22:6 (n-3) was presumably
associated with a low intake of the fatty acids, since they were minor
in Skeletonerna costaturn.
PUFAs could affect the quality of oysters fed Skeletonema costatum since they
are highly unsaturated and therefore very sensitive to oxidation.
183