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Publication
Digestive physiology and food intake in marine fish larvae with respect to dietary neutral lipids
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Authors
Advisor(s)
Abstract(s)
A growth depressing effect of high dietary neutral lipid levels in marine fish larvae has
been reported. This may be the result of a decrease in the efficiency or activity of digestive
enzymes, a reduction in absorption efficiency and/or a decrease in food intake. In this thesis,
work was carried out on commercially valuable species (Atlantic herring, Senegalese sole,
European seabass and gilthead seabream), to investigate the effects of neutral lipid level and
source (fatty acid composition) on some of these key factors influencing larval growth. The
results seem to collectively indicate that lipid transport from the enterocytes into the body
may be more problematic in larval stages dealing with high neutral lipid diets than lipid
digestion, although both factors are likely to intervene. Food intake did not appear to be
strictly regulated by total lipid content of the diet and lipid source may have an important role
in controlling ingestion. Therefore, the neutral lipid level in diets for marine fish larvae has a
significant impact in several factors influencing growth but clearly it cannot be dissociated of
its fatty acid composition, which appears to play a central role on the nutritional and
physiological effects of dietary lipid, at the ingestion, digestion and absorption levels.
Description
Tese dout., Aquacultura, Universidade do Algarve, 2005
Keywords
Teses Aquacultura Larvas Fisiologia digestiva Absorção lipídica Ingestão Dietas larvares