Ulfert Focken

2.8k total citations
95 papers, 2.3k citations indexed

About

Ulfert Focken is a scholar working on Aquatic Science, Ecology and Nature and Landscape Conservation. According to data from OpenAlex, Ulfert Focken has authored 95 papers receiving a total of 2.3k indexed citations (citations by other indexed papers that have themselves been cited), including 75 papers in Aquatic Science, 35 papers in Ecology and 22 papers in Nature and Landscape Conservation. Recurrent topics in Ulfert Focken's work include Aquaculture Nutrition and Growth (74 papers), Isotope Analysis in Ecology (23 papers) and Aquaculture disease management and microbiota (21 papers). Ulfert Focken is often cited by papers focused on Aquaculture Nutrition and Growth (74 papers), Isotope Analysis in Ecology (23 papers) and Aquaculture disease management and microbiota (21 papers). Ulfert Focken collaborates with scholars based in Germany, Austria and United Kingdom. Ulfert Focken's co-authors include Karsten Becker, Julia Gaye‐Siessegger, Christian Schlechtriem, Mostafa Ali Reza Hossain, Christian Lückstädt, Stefan Muetzel, Klaus Becker, Hansjörg Abel, Mansour El‐Matbouli and James McCullagh and has published in prestigious journals such as PLoS ONE, Journal of Cleaner Production and Oecologia.

In The Last Decade

Ulfert Focken

91 papers receiving 2.1k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Ulfert Focken Germany 28 1.2k 1.1k 583 414 381 95 2.3k
Luı́s Narciso Portugal 28 1.4k 1.2× 1.7k 1.5× 984 1.7× 290 0.7× 368 1.0× 84 2.7k
Francisco Amat Spain 34 830 0.7× 1.3k 1.2× 382 0.7× 387 0.9× 259 0.7× 107 3.1k
Jacques Rinchard United States 32 1.3k 1.1× 629 0.6× 281 0.5× 932 2.3× 397 1.0× 96 2.4k
Diana Madeira Portugal 23 722 0.6× 1.4k 1.3× 517 0.9× 208 0.5× 374 1.0× 55 2.0k
R. Hofer Austria 25 939 0.8× 403 0.4× 246 0.4× 436 1.1× 402 1.1× 52 1.9k
Sten Ivar Siikavuopio Norway 25 889 0.7× 658 0.6× 625 1.1× 396 1.0× 201 0.5× 90 1.7k
Carolina A. Freire Brazil 29 1.3k 1.1× 1.6k 1.4× 421 0.7× 767 1.9× 342 0.9× 99 2.8k
Robert R. Stickney United States 29 2.5k 2.1× 643 0.6× 486 0.8× 773 1.9× 901 2.4× 105 3.2k
Piamsak Menasveta Thailand 31 1.5k 1.2× 806 0.7× 382 0.7× 96 0.2× 1.1k 2.9× 107 2.9k
Nadezhda N. Sushchik Russia 25 783 0.6× 652 0.6× 370 0.6× 372 0.9× 87 0.2× 55 1.8k

Countries citing papers authored by Ulfert Focken

Since Specialization
Citations

This map shows the geographic impact of Ulfert Focken's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ulfert Focken with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ulfert Focken more than expected).

Fields of papers citing papers by Ulfert Focken

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ulfert Focken. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ulfert Focken. The network helps show where Ulfert Focken may publish in the future.

Co-authorship network of co-authors of Ulfert Focken

This figure shows the co-authorship network connecting the top 25 collaborators of Ulfert Focken. A scholar is included among the top collaborators of Ulfert Focken based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ulfert Focken. Ulfert Focken is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Rebelein, Anja & Ulfert Focken. (2020). Microplastic fiber diet—Fiber-supplemented pellets for small fish. MethodsX. 8. 101204–101204. 5 indexed citations
2.
3.
Jauncey, K., et al.. (2016). Jatropha curcas kernel meal as a replacement for fishmeal in practical Nile tilapia, Oreochromis niloticus feeds. Stirling Online Research Repository (University of Stirling). 9(3). 590–596. 2 indexed citations
4.
Tuấn, Nguyễn Ngọc, et al.. (2014). Earthworm Meal as Fishmeal Replacement in Plant based Feeds for Common Carp in Semi-intensive Aquaculture in Rural Northern Vietnam. Turkish Journal of Fisheries and Aquatic Sciences. 14(2). 557–565. 12 indexed citations
5.
El‐Matbouli, Mansour, et al.. (2014). Pesticide-contaminated feeds in integrated grass carp aquaculture: toxicology and bioaccumulation. Diseases of Aquatic Organisms. 108(2). 137–147. 22 indexed citations
6.
Nguyễn, Ngọc Tuấn, et al.. (2012). Earthworm meal as alternative animal protein source for full and supplemental feeds for common carp (Cyprinus carpio L.). OpenAgrar. 3 indexed citations
7.
Focken, Ulfert, et al.. (2012). Upland aquaculture in Yen Chau district (Son La Province, Northern Vietnam): status, limitations and possible innovations for sustainable development. OpenAgrar. 1 indexed citations
8.
Focken, Ulfert, et al.. (2012). A respirometer system to measure critical and recovery oxygen tensions of fish under simulated diurnal fluctuations in dissolved oxygen. Aquaculture International. 21(1). 31–44. 15 indexed citations
9.
Stadtlander, Timo, Berta Levavi‐Sivan, Saleh Abu‐Lafi, et al.. (2011). Effects of saponin fractions from Trigonella foenum-graecum and Balanites aegyptiaca on gene expression of GH, IGF-1 and their respective receptors, growth, nutrient utilization, body composition, oxygen consumption and plasma IGF-1 in Nile tilapia (Oreochromis niloticus, L.).. 245–259. 1 indexed citations
10.
Focken, Ulfert. (2008). Application of Stable Isotopes in Aquaculture Nutrition Research. 1 indexed citations
11.
Stadtlander, Timo, George Francis, Ulfert Focken, et al.. (2008). Saponin fractions from Trigonella foenum-graecum in the diet affect growth and expression of GH and IGF-1 encoding genes in tilapia (Oreochromis niloticus). Comparative Biochemistry and Physiology Part A Molecular & Integrative Physiology. 151(1). S12–S13. 4 indexed citations
12.
13.
Stadtlander, Timo, Ulfert Focken, Berta Levavi‐Sivan, et al.. (2008). Treatment with saponins from Trigonella foenum-graecum and Quillaja saponaria influences sex ratio in Nile tilapia (Oreochromis niloticus) larvae.. Bioorganic & Medicinal Chemistry Letters. 24(7). 355–364. 6 indexed citations
14.
Schlechtriem, Christian, Ulfert Focken, & Karsten Becker. (2007). 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. 36(1). 24–31. 26 indexed citations
15.
16.
Schlechtriem, Christian, Ulfert Focken, & Karsten Becker. (2004). Stable Isotopes as a Tool for Nutrient Assimilation Studies in Larval Fish Feeding on Live Food. Aquatic Ecology. 38(1). 93–100. 34 indexed citations
17.
Lückstädt, Christian, et al.. (2000). Evidence of violation of a basic assumption in models currently used for food consumption estimation in fish. 49(3). 171–188. 11 indexed citations
18.
Lückstädt, Christian, et al.. (2000). An improved procedure to assess fish condition on the basis of length-weight relationships. 48(3). 255–264. 102 indexed citations
19.
Focken, Ulfert, et al.. (1999). Analysing the diel feeding patterns and daily ration of Nile tilapia, Oreochromis niloticus (L.), in Laguna de Bay, Philippines. Journal of Applied Ichthyology. 15(6). 165–170. 7 indexed citations
20.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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