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List of works by Ulfert Focken

15N tracer application to evaluate nitrogen dynamics of food webs in two subtropical small-scale aquaculture ponds under different managements.

scientific article

Determination of underivatized amino acid delta(13)C by liquid chromatography/isotope ratio mass spectrometry for nutritional studies: the effect of dietary non-essential amino acid profile on the isotopic signature of individual amino acids in fish

scientific article published in June 2008

Effect of different ratios of wheat to corn flour in the diet on the development and isotopic composition (delta13C, delta15N) of the red flour beetle Tribolium castaneum

scientific article published on June 2007

Effects of a saponin fraction extracted fromTrigonella foenum-graecumL. and two commercially available saponins on sex ratio and gonad histology of Nile tilapa fry,Oreochromis niloticus(L.)

scholarly article in Journal of Applied Ichthyology, vol. 29 no. 1, September 2012

Feeding level and diet quality influence trophic shift of C and N isotopes in Nile tilapia (Oreochromis niloticus (L.)).

scientific article published on June 2003

Feeding level and individual metabolic rate affect delta 13C and delta 15N values in carp: implications for food web studies.

scientific article published on 8 November 2003

Improving estimates of trophic shift (Δδ(trophic)) for diet reconstruction studies using enzyme activities.

scientific article published on 12 January 2013

Improving estimates of trophic shift in Nile tilapia, Oreochromis niloticus (L.), using measurements of lipogenic enzyme activities in the liver.

scientific article published on January 2005

Individual protein balance strongly influences delta15N and delta13C values in Nile tilapia, Oreochromis niloticus

scientific article published on 20 January 2004

Influence of dietary non-essential amino acid profile on growth performance and amino acid metabolism of Nile tilapia, Oreochromis niloticus (L.).

scientific article published on 27 October 2006

Metabolic fractionation of stable carbon isotopes: implications of different proximate compositions for studies of the aquatic food webs using δ13C data

scientific article

Panagrellus redivivus(Linné) as a live food organism in the early rearing of the catfishSynodontis petricola(Matthes)

Pesticide-contaminated feeds in integrated grass carp aquaculture: toxicology and bioaccumulation

scientific article published in February 2014

The effect of dietary amino acid abundance and isotopic composition on the growth rate, metabolism and tissue δ13C of rainbow trout.

scientific article published on 21 March 2011

The suitability of the free-living nematode Panagrellus redivivus as live food for first-feeding fish larvae

article by Christian Schlechtriem et al published June 2004 in Journal of Applied Ichthyology

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