Dietary lipid content influences the activity of lipogenic enzymes in the liver and on whole body delta13C values of Nile tilapia, Oreochromis niloticus (L.)

Isotopes in Environmental and Health Studies
Julia Gaye-SiesseggerK Becker

Abstract

The use of stable isotope techniques for the reconstruction of diets has increased over the last decade. However, isotopic ratios in an animal are not only affected by the composition of the feed, but also by the amount of feed consumed. An uncertainty of up to 1 per thousand for both delta13C and delta15N values has been observed when the feeding level is unknown. This may have substantial effects on the results of back-calculation. As the feeding level of animals is unknown in nature, an additional indicator for their nutritional status is needed. High feeding levels and a consequent surfeit of dietary energy lead to the synthesis of lipids. In order to test whether the level of lipogenesis could be used as an indicator, Nile tilapia (Oreochromis niloticus) were fed four isonitrogenous and isoenergetic wheat-based semi-synthetic diets with different lipid contents (2.0 %, 4.5 %, 9.5 % and 13.3 %) for eight weeks. Body composition, gross energy content and delta13C values in the lipids and the lipid-free material were determined in diets and fish bodies. The livers of three fish per feeding group were assayed for the activity of two lipogenic enzymes, ATP-citrate lyase and malic enzyme. There was a strong negative correlation ...Continue Reading

References

Jan 1, 1982·The Journal of Nutrition·T A Likimani, R P Wilson
Jul 23, 2003·Isotopes in Environmental and Health Studies·J Gaye-SiesseggerK Becker
Jul 23, 2003·Isotopes in Environmental and Health Studies·Ch SchlechtriemK Becker
Nov 1, 2002·Oecologia·Gerardo L HerreraVíctor Sánchez-Cordero
Jan 1, 2002·Oecologia·Donald L Phillips, Paul L Koch

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Citations

Mar 1, 2006·Fish Physiology and Biochemistry·Angshuman BiswasArun Kumar Ray
Nov 22, 2012·The British Journal of Nutrition·A Cláudia Figueiredo-SilvaInge Geurden
Jun 9, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Shamsuddin Mohammed MamunKlaus Becker
Jan 25, 2005·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·J Gaye-SiesseggerK Becker

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