Lipid and fatty acid
composition of ovaries from wild fish and ovaries and eggs from captive fish
of white sea bream (Diplodus sargus)
J.R. Cejas, E. Almansa, J.E. Villamandos, P. Badía,
A. Bolaños, A. Lorenzo-2003
Aquaculture, 216(1-4) 299-313
Abstract:
The fatty acid composition of ovaries from wild white
sea bream and ovaries and eggs of captive white sea bream were investigated
to estimate the fatty acid requirements of this species. The total lipid
(TL) content in wild fish ovaries was similar to that found in ovaries and
eggs from captive fish. The general pattern of the fatty acid distribution
in lipid of ovaries from wild fish and ovaries and eggs from captive fish
was similar. In total lipid, no significative differences in total monoenes,
n-6, n-3 and n-3 highly unsaturated fatty acids (HUFA)
were found. However, the relative percentage of specific fatty acids
differed between wild and captive fish. Thus, arachidonic acid (20:4n-6,
AA) percentage was higher in wild ovaries than in ovaries and eggs from
captive fish, whereas eicosapentaenoic acid (20:5n-3, EPA) showed the
opposite trend. In consequence, wild fish presented a lower EPA/AA ratio in
their ovaries when compared with ovaries and eggs of captive fish. These
differences were extended to all lipid classes studied (triacylglycerol
(TG), phosphatidylcholine (PC) and phosphatidylethanolamine (PE)). The
present study suggests that essential fatty acids, specially EPA and AA of
the diet supplied to the captive white sea bream broodstocks, do not seem to
be in an appropriate proportion for this species.
(Centro Oceanográfico de Canaria (I.E.O.), Crta. de
San Andrés s/n, 38120, Santa Cruz de Tenerife, Spain, Tel.: +34-922-318339;
fax: +34-922-318311; email of A. Lorenzo: alorenhe@ull.es)