Publikationen: apl. Prof. Dr. Ulfert Focken

Titel	Jahr	Publikationsart	Autoren
Pesticide-contaminated feeds in integrated grass carp aquaculture: toxicology and bioaccumulation Dis. Aquat. Org.	2014	Zeitschriftenbeitrag (peer-reviewed)	Pucher, J., Gut, T., Mayrhofer, R., El-Matbouli, M., Viet, P.H., Ngoc, N.T., M. Lamers, M., Streck, T., Focken, U.
Application of stable isotopes in aquaculture nutrition research.	2008	Kongressbeitrag	Focken U.
Analysis of soil nutrients and organic matter in orgnic and conventional marine shrimp ponds at Guaveira Lagoon, Rio Grande do North State, Brazil.	2007	Kongressbeitrag	Schober Goncalves Lima J. and Focken U.
Application of stable isotopes of carbon and nitrogen in aquaculture research	2007	Vortrag	Focken U.
Aquaculture in Germany: Production and production systems	2007	Vortrag	Gaye-Siessegger J. and Focken U.
Carbon and nitrogen isotopes in the body of red flower beetles, Tribolium castaneum, reared on wheat grown under FACE (Free Air Carbon Dioxide Enrichment) or control conditions and three mixtures thereof.	2007	Vortrag	Focken U.
Comparison of metabolic rates and feed nutrient digestibility in conventional, genetically improved (GIFT) and genetically male (GMNT) Nile tilapia, Oreochromis niloticus (L.). Comparative Biochemistry and Physiology	2007	Zeitschriftenbeitrag	MAMUN,S.M., FOCKEN,U. & BECKER,K.
Utilization of local feeds resources and available agricultural residues from the Palestinian region for tilapia feeding Egyptian Journal of Aquatic Biology and Fisheries	2007	Arbeitspapier/Diskussionspapier	Qutob M., Dweik H., Shihab S., Abu-Lafi S., Levavi-Sivan B., Kerem Z., Francis G., Focken U. and Becker K
A Comparison of Macrobenthos Occurence in Organic and Conventional Marine Shrimp Farms in Guarairas Lagoon, Rio Grande do Norte State, Brazil Journal of the World Aquaculture Society	2006	Arbeitspapier/Diskussionspapier	Lima, J.S.G., Santos, A.S., Almeida, E.A., Santos, R.L. and Focken, U
Digestion and assimilation of the free-living nematode Panagrellus redivivus fed to first feeding coregonid larvae: Evidence from histological and isotopic studies. Journal of the World Aquaculture Society	2005	Zeitschriftenbeitrag	Schlechtriem, C., Focken, U. and Becker, K.
Improving estimates of trophic shift in Nile tilapia, Oreochromis niloticus (L.), using measurements of lipogenic enzyme activities in the liver. Comparative Biochemistry and Physiology	2005	Zeitschriftenbeitrag	Gaye-Siessegger J., Focken U., Abel H.-J., Becker K.
Small-scale aquaculture in upland areas of Yen Chau District, Son La Province / Northern Vietnam	2005	Kongressbeitrag	Steinbronn S., Tuan N. N., Focken U. and Becker K.
The Use of Pesticides in Paddy Rice and Possible Impacts on Fish Farming in Yen Chau/Son La Province/Northern Vietnam	2005	Kongressbeitrag	Steinbronn S., Geiss C., Fangmeier A., Tuan N. N., Focken U. and Becker K.
Dietary lipid content influences the activity of lipogenic enzymes in the liver and whole body 13C values of Nile tilapia, Oreochromis niloticus (L.). Isotopes in Environmental and Health Studies	2004	Zeitschriftenbeitrag	Gaye-Siessegger J., Focken U., Abel H.-J., Becker K.
Feeding fish with diets of different ratios of C3- and C4-plant-derivd ingredients: a laboratory analysis with implications for the back-calculation of diet from stable isotope data Rapid Communications in Mass Sppectrometry	2004	Zeitschriftenbeitrag	Focken, U.
Feeding level and individual metabolic rate affect 13C and 15N values in carp: Implications for food web studies. Oecologia	2004	Zeitschriftenbeitrag	Gaye-Siessegger J., Focken U., Muetzel S., Abel H.-J., Becker K.
Growth performance and metabolic rates of genetically improved and conventional strains of Nile tilapia, Oreochromis niloticus (L.), reared individually and fed ad libitum Proceeding of Sixth International Symposium on Tilapia in Aquaculture	2004	Kongressbeitrag	Mamun, S. M., Focken, U., Francis, G. and Becker, K.
Impact of dietary Quillaja saponins on growth, sex ratio and reproduction of Nile tilapia Oreochromis niloticus under field conditions in Bangladesh	2004	Arbeitspapier/Diskussionspapier	Steinbronn S., Hossain A., Francis G., Focken U. and Becker K.
Individual protein balance strongly influences 15N and 13C values in Nile tilapia, Oreochromis niloticus. Naturwissenschaften	2004	Zeitschriftenbeitrag	Gaye-Siessegger J., Focken U., Abel H.-J. and Becker K.
Some mathematical considerations in estimating daily ration in fish using food consumption models. Ecological Modelling	2004	Zeitschriftenbeitrag	Richter, H., Lückstädt, C., Focken, U., and Becker, K.
Development of a low cost technology for mass production of the free-living nematode Panagrellus redivivus as an alternate live food for first feeding fish larvae. Applied Microbiology and Biotechnology	2003	Zeitschriftenbeitrag	Ricci, M., Fifi, A. P., Ragni, A., Schlechtriem, C., and Focken, U.
Evacuation of pelleted feed and the suitability of titanium (IV) oxide as a feed marker for gut kinetics in Nile tilapia. Journal of Fish Biology	2003	Zeitschriftenbeitrag	Richter, H., Lückstädt, C., Focken, U., and Becker, K.
Feeding level and diet quality influence trophic shift of C and N isotopes in Nile tilapia (Oreochromis niloticus, (L.)) Isotopes in Environmental and Health Studies	2003	Zeitschriftenbeitrag	Gaye-Siessegger J., Focken U., Abel H.-J. and Becker K.
Evidence of violation of a basic assumption in models currently used for food consumption estimation in fish Archive of Fishery and Marine Research	2002	Zeitschriftenbeitrag	Richter, H., Lückstädt, C., Schlechtriem, C., Focken, U., and Becker, K
Individual variability of growth, body composition and metabolic rates in cloned Tilapia (Oreochromis niloticus) EAAP Publication 103	2001	Kongressbeitrag	Focken, U.; Groth, A.; Hörstgen-Schwark, G.; Becker, K.
Is there size-dependent feeding behaviour of milkfish Chanos chanos cultured semi-intensively in the Philippines? Book of Abstract	2001	Kongressbeitrag	C. Lückstädt, U. Focken, K. Becker
Laboratory investigations on the influence of oxygen concentration in water on the feeding behaviour of Tiger shrimp (Penaeus monodon) Tagungsband	2001	Kongressbeitrag	Groth, A.; Focken, U.; Becker, K.
Stable isotopes in Animal Ecology: The effect of ration size on the trophic shift of C and N isotopes between feed and carcass. Isotopes Environm.Health Stud.	2001	Zeitschriftenbeitrag	Focken, U.
An improved procedure to assess fish condition on the basis of length-weight relationships Archive of Fishery and Marine Research	2000	Zeitschriftenbeitrag	Richter, H., Lückstädt, C., Focken, U., Becker, K.
Growth, metabolic rates and body composition of individually reared triploid Tilapia (Oreochromis niloticus) in comparison to diploid full-sibs Tilapia Aquaculture in the 21st Century	2000	Kongressbeitrag	Focken, U.; Höstgen-Schwark, G.; Lückstädt, C.; Becker, K.
Improving profitability of small scale farming by integrating fish culture into traditional rice farming in Kerala state, India International Agricultural Research, A contribution to crisis prevention'. Abstracts of contributions presented at the 'Deutscher Tropentag 2000	2000	Kongressbeitrag	Francis,G., Focken, U., Becker, K.
Quantification of fish feed intake with the model MAXIMS: Evidence for severe underestimation of daily ration Responsible Aquaculture in the New Millennium (Book of Abstracts AQUA 2000)	2000	Kongressbeitrag	Richter, H.; Lückstädt, C.; Schlechtriem, C.; Focken, U.; Becker, K.
Survey on the use of natural food and supplemental feed in commercial milkfish farms on Panay, Philippines Book of Abstracts and Proceedings on CD-ROM of "Deutscher Tropentag 2000"	2000	Kongressbeitrag	Lückstädt,C.; Focken,U.; Coloso,R.; Becker,K.
A review of the fish feeding model MAXIMS Ecological Modelling	1999	Zeitschriftenbeitrag	Richter, H.; Focken, U.; Becker, K.
A Traditional Rice Prawn Rotation Culture System from Kerala state, India Knowledge Partership, Challenges and perspectives for research and education at the turn of the millennium'. Abstracts of contributions presented at the 'Deutscher Tropentag 1999	1999	Kongressbeitrag	Francis,G., Focken, U., Becker, K.
Untersuchungen zur Nahrungsökologie von Milchfischen (Chanos chanos Forsskal) in semi-intensiven Teichsystemen auf den Philippinen IV. Symposium zur Ökologie, Ethologie und Systematik der Fische und II. Tagung der Gesellschaft für Ichthyologie – Programm und Kurzfassungen der Beiträge	1999	Kongressbeitrag	Lückstädt, C.; Focken, U.; Coloso, R.M.; Pedroso, F.; Becker, K.
An estimation of the daily food intake of milkfish (Chanos chanos Forsskal) in a semi-intensively managed commercial brackishwater pond in the Philippines Book of Abstracts	1998	Kongressbeitrag	Lückstädt, C.; Focken, U.; Coloso, R.M.; Becker, K.
Contribution of natural food and supplemental feed to the growth of shrimp (Penaeus monodon Fabricius) in grow-out ponds: Analysis of gut content Aquaculture	1998	Zeitschriftenbeitrag	Focken, U.; Groth, A.; Coloso, R.M.; Becker, K.
Individually reared female Nile tilapia (Oreochromis niloticus) can grow faster than males Journal of Applied Ichthyology	1998	Zeitschriftenbeitrag	Schreiber, S.; Focken, U.; Becker, K.
Laguna de Bay, Philippines: An Ecosystem Approach for Sustainable Management. Final Scientific Report to the European Union, Vol. I	1998	Interner Bericht / Report	Focken, U. (editor)
Laguna de Bay, Philippines: An Ecosystem Approach for Sustainable Management. Final Scientific Report to the European Union, Vol. II	1998	Interner Bericht / Report	Focken, U. (editor)
Laguna de Bay, Philippines: An Ecosystem Approach for Sustainable Management. Scientific Progress Report 1997 to the European Union	1998	Interner Bericht / Report	Focken, U. (editor)
MAXIMS, a computer model for estimating daily ration in fish: A test of its stability in the face of artificially introduced variability	1998	Vortrag	Richter, H.; Focken, U.
Metabolic fractionation of stable carbon isotopes: Implications of different proximate compositions for studies of the aquatic food webs using delta-C13 data Oecologica	1998	Zeitschriftenbeitrag	Focken, U.; Becker, K.
Resource utilization by aquaculture in the Tropics: Requirements of different production systems for production factors of the fish farmer Animal Research and Development	1998	Zeitschriftenbeitrag	Becker, K.; Focken, U.
Utilisation of agricultural and fishery by-products in aquaculture in Kerala state, India Stabilisierung und nachhaltige Entwicklung land- und forstwirtschaflicher Systeme in den Tropen'. Articles based on contributions presented at the 'Deutscher Tropentag 1998	1998	Kongressbeitrag	Francis,G., Focken, U., Becker, K.
A note on the effects of L-carnitine on the energy metabolism of individually reared carp, Cyprinus carpio L. Aquaculture Nutrition	1997	Zeitschriftenbeitrag	Focken, U.; Becker, K.; Lawrence, P.R.
Laguna de Bay, Philippines: An Ecosystem Approach for Sustainable Management. Scientific Progress Report 1996 to the European Union	1997	Interner Bericht / Report	Focken, U. (editor)
Wachstum und Nahrungsaufnahme des Milchfisches (Chanos chanos FORSSKAL 1775) während der Regen- und Trockenzeit in der semi- intensiven Teichproduktion auf den Philippinen Proceedings of the Society of Nutrition Physiology	1997	Zeitschriftenbeitrag	Kühlmann, K.-J.; Focken, U.; Becker, K.
Production of milkfish (Chanos chanos) in semi-intensive aquaculture systems in the Philippines: Importance, problems and scientific approaches to increase productivity Animal Research and Development	1996	Zeitschriftenbeitrag	Focken, U.; Becker, K.
An item of staple diet from the mangrove swamps: Improved methods of production for the milkfish German Research – Reports of the DFG	1995	Zeitschriftenbeitrag	Becker, K.; Focken, U.; Schroeder, K.; Coloso, R.M.
Effect of feed supplementation with L-carnitine on growth, metabolism and body composition of carp (Cyprinus carpio L.) [Meeting abstract] Aquaculture	1995	Zeitschriftenbeitrag	Becker, K.; Focken, U.
Ein Grundnahrungsmittel aus den Mangrovensümpfen: Verbesserte Produktionsmethoden für den Milchfisch forschung – Mitteilungen der DFG	1995	Zeitschriftenbeitrag	Becker, K.; Focken, U.; Schroeder, K.; Coloso, R.M.
Body composition of carp (Cyprinus carpio L.) Fish Ecotoxicology and Ecophysiology	1993	Buchbeitrag	Focken, U.; Becker, K.
Temperature-induced metabolic costs in carp, Cyprinus carpio L., during warm and cold acclimatization Journal of Applied Ichthyology	1992	Zeitschriftenbeitrag	Becker, K.; Meyer-Burgdorff, K.; Focken, U.