Effects of starvation and
dietary lipid on the lipid and fatty acid composition of muscle tissue of
juvenile green abalone (Haliotis fulgens)
E. Durazo-Beltrán, M.T. Viana, L.R. D'Abramo, J.F.
Toro-Vazquez-2004
Aquaculture, 238: 329-341
Abstract:
Lipid metabolism of juvenile abalone, either starved
or fed diets containing either 3.0 (HL) or 0.12% (LL) lipid, was
investigated. Abalone were initially fed a nutritionally balanced formulated
diet. Both PUFA and HUFA were low in the experimental formulated diets.
After 60 days, growth rates of abalone fed the formulated diets were low and
probably reflective of a lack of sufficient essential fatty acids. However,
the total lipid content of the muscle tissue of abalone fed diets LL and HL
remained unchanged from that of the start of the experiment. However, the
level in the starved abalone was significantly higher (21.5%) than that of
abalone at the start of the experiment. The percentage of polar lipid and
neutral lipid in the abalone muscle tissue ranged from 70.8% to 76.1% and
23.9% to 29.2%, respectively. Levels of 20:4n-6, 20:5n-3 and 22:5n-3 in the
polar lipid of the muscle of the starved abalone significantly increased
while levels of 20:4n-6 and 20:5n-3 in the neutral lipid for abalone in all
treatments decreased, suggesting the essentiality of these HUFA. Levels of
20:5n-3 and 22:6n-3 in the polar lipid of the tissue of the starved abalone
were significantly higher than the levels of these respective fatty acids in
the abalone fed diets HL and LL. These higher levels probably reflect the
weight loss associated with starvation combined with lipid not being used as
an energy source. More research directed toward the determination of the
fatty acid requirements of postlarvae and for successful maturation and a
spawning of abalone needs to be conducted.
(Facultad de Ciencias Marinas, Universidad Autónoma
de Baja California, A.P. 453, 22860, Ensenada, BC, Mexico, e-mail of M.T.
Viana: viana@uabc.mx)