Effects of
starvation and feeding on the fatty acid profiles of Stage I phyllosoma of
the spiny lobster, Jasus edwardsii
G.G. Smith, P.A. Thompson, A.J. Ritar,
G.A. Dunstan-2003
Aquaculture
Research, 34(5):
419
Abstract:
Fatty acid analyses were conducted on
newly hatched and 8-day-old-starved and fed Stage I phyllosoma larvae of the
spiny lobster, Jasus edwardsii. Fed animals were offered excess 1.5 mm
juvenile Artemia (enriched using the alga Isochrysis galbana,
Tahitian isolate, T. iso.). After 8 days, there were significant
increases in larval dry weight and the proportion of lipid in fed
phyllosoma, whereas these parameters decreased in starved phyllosoma. The
abundance of the saturated fatty acids 16 : 0 and 18 : 0
increased in both starved and fed phyllosoma, whereas the main
monounsaturated fatty acids 16 : 1n-7, 18 : 1n-9
and 18 : 1n-7 increased with feeding but decreased with
starvation. There were no significant differences in the relative
proportions of the highly unsaturated fatty acids (HUFAs) arachidonic (AA,
20 : 4n-6), eicosapentaenoic (EPA, 20 : 5n-3) and
docosahexanoic (DHA, 22 : 6n-3) acids between newly hatched and
starved animals, whereas quantitatively DHA decreased with starvation and
feeding. The DHA/EPA ratio was significantly lower in the starved and fed
phyllosoma (0.5) compared with that found in the newly hatched phyllosoma
(0.9). The lipid profiles of the newly hatched, starved and fed phyllosoma
contained large amounts of n-6 fatty acids resulting in low n-3 : n-6
ratios (2.8, 2.7 and 1.6 respectively). The importance of these results
and the ability of enriched Artemia to provide a suitable fatty acid
profile for this species are discussed.
(Marine Research Laboratories, Tasmanian
Aquaculture and Fisheries Institute, Nubeena Crescent Taroona, Tasmania
7053, Australia. E-mail: greg.smith@dpiwe.tas.gov.au)