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Publications
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Reiser S, Illing B, Pohlmann DM, Focken U (2026) Environmental enrichment during early rearing of salmonids : practical implementation in commercial hatcheries. Aquaculture 611:742995, DOI:10.1016/j.aquaculture.2025.742995
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Barz F, Lasner T, Dorrien C von, Döring R, Goti L, Probst WN, Kraus G, Kreiß CM, Krumme U, Reiser S, Schulze T, Stelzenmüller V, Stepputtis D, Simons SL, Strehlow HV, Zimmermann C (2025) An analysis of stakeholders' vision of the future of coastal fisheries in Germany. ICES J Mar Sci 82(6):fsaf074, DOI:10.1093/icesjms/fsaf074
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Nielsen R, Guillen J, Llorente Garcia I, Asche F, Garlock T, Kreiß CM, Višnic Novakovic S, Danatskos C, Cozzolino M, Pokki H, Kankainen M, Dennis J, Jackson E, Mytlewski A, Kulikowski T, Rakowski M, Tveterås R (2025) An analysis of the European aquaculture industry using the aquaculture performance indicators. Aquacult Econ Manag 29(2):253-274, DOI:10.1080/13657305.2025.2453747
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Salehi H, Reiser S, Focken U (2025) Assessment of the nutritional and effluent properties of potential fish-meal-free diets for rainbow trout (Oncorhynchus mykiss W.) in Iran. Aquaculture Int 33(3):165, DOI:10.1007/s10499-025-01841-z
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Ellrich JA, Kozian-Fleck C, Brand M, Colsoul B, Pogoda B (2025) Ecological reef restoration: consumptive and nonconsumptive interactions among common North Sea predators and European oysters. Front Environ Sci 13:1509318, DOI:10.3389/fenvs.2025.1509318
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Noetzel DC, Colsoul B, Akcha F, Briant N, Le Roy J, Francois V, Stavrakakis C, Pogoda B, Sokolova IM (2025) Effect of temperature and trace metal exposure on early life stages of European flat oysters and Pacific oysters. Mar Environ Res 211:107376, DOI:10.1016/j.marenvres.2025.107376
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Ermgassen PEE zu, Albentosa M, Bakker N, Barja JL, Blanco A, Bonacic K, Brundu G, Carboni S, Colsoul B, Gair JR, Gray M, Costa F da, Dubbeldam M, Fabra M, Galley T, Hernandis S, Jones N, Laugen AT, Love R, Araujo Pineiro N, et al (2025) Identifying common factors resulting in hatchery crashes during the production of Ostrea edulis for ecological restoration in Europe. Aquatic Liv Res 38:18, DOI:10.1051/alr/2025016
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Perez Agundez JA, Filgueira R, Ahmed N, Asif F, Billing S-L, Fanning L, Himes-Cornell A, Johnson TR, Krause G, Kreiß CM, Mikkelsen E, Stead SM, van den Burg S, Vecchio Y, Villasante S (2025) Strengthening policy action to tackle social acceptability issues in European aquaculture. ICES J Mar Sci 82(7):fsaf100, DOI:10.1093/icesjms/fsaf100
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Krause G, Filgueira R, Ahmed N, Alexander KA, Asif F, Fanning L, Ferse SCA, Fuchs N, Grant J, Guillen J, Hörterer C, Johnson TR, Kaiser M, Kite-Powell HL, Kreiß CM, Lipton D, Marin SL, Mikkelsen E, Nahuelhual L, Stead SM, et al (2025) The local turn in a global sea : identifying sustainability trade-offs in regionalized marine aquaculture systems. Reviews Aquacult 17(4):e70071, DOI:10.1111/raq.70071
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Salehi H, Reiser S, Pourkazemi M, Focken U (2024) Complete replacement of fish meal with potential aquafeed ingredients for rainbow trout in Iran. Turk J Fish & Aquat Sci 24(3):TRJFAS24254, DOI:10.4194/TRJFAS24254
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Klinkmann D, Kreiß CM, Focken U (2024) Hemmnisse und Verbesserungspotenziale der Öko-Aquakultur in Deutschland. Ber Landwirtsch 102(1), DOI:10.12767/buel.v102i3.507
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Wuertz S, Reiser S (2023) Creatine: A valuable supplement in aquafeeds? Reviews Aquacult 15(1):292-304, DOI:10.1111/raq.12717
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Reiser S, Michels T, Illing B (2023) First steps towards mass rearing of European smelt (Osmerus eperlanus, L.) using conventional hatchery equipment. Aquatic Liv Res 36:8, DOI:10.1051/alr/2023003
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Salehi H, Reiser S, Focken U (2023) Nutrient digestibility and retention of potential feed ingredients for rainbow trout (Oncorhynchus mykiss W.) aquaculture in Iran. Aquacult Nutr 2023:8910005, DOI:10.1155/2023/8910005
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Hermann C, Dahlke FT, Focken U, Trommsdorff M (2022) Aquavoltaics: dual use of natural and artificial water bodies for aquaculture and solar power generation. In: Gorjian S, Campana PE (eds) Solar energy advancements in agriculture and food production systems. London: Academic Press, pp 211-236
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Rebelein A, Focken U (2021) Microplastic fiber diet - Fiber-supplemented pellets for small fish. MethodsX 8:101204, DOI:10.1016/j.mex.2020.101204
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Reiser S, Sähn N, Pohlmann DM, Willenberg M, Focken U (2021) Rearing juvenile brown Salmo trutta (L.), and rainbow trout Oncorhynchus mykiss (Walbaum), in earthen ponds with and without an induced current. J Appl Aquacult 33(1):32-52, DOI:10.1080/10454438.2019.1678545
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Lasner T (2020) "Being Typical" - The representative farms method in aquaculture and fisheries. Mediterranean Fish Aquacult Res 3(2):92-100
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Mayrhofer R, Menanteau-Ledouble S, Pucher J, Focken U, El-Matbouli M (2020) Aeromonas spp. suggested as the causative agents of red spot disease in northern Vietnamese grass carp Ctenopharyngodon idella. Dis Aquat Organ 139:113-119, DOI:10.3354/dao03479
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Lasner T, Mytlewski A, Nourry M, Rakowski M, Oberle M (2020) Carp land: Economics of fish farms and the impact of region-marketing in the Aischgrund (DEU) and Barycz Valley (POL). Aquaculture 519:734731, DOI:10.1016/j.aquaculture.2019.734731
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Barreto-Curiel F, Focken U, D'Abramo LR, Mata-Sotres J, Viana MT (2019) Assessment of amino acid requirements for Totoaba macdonaldi at different levels of protein using stable isotopes and a non-digestible protein source as a filler. Aquaculture 503:550-561, DOI:10.1016/j.aquaculture.2019.01.038
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Callier MD, Byron CJ, Bengtson DA, Cranford PJ, Cross SF, Focken U, Jansen HM, Kamermans P, Kiessling A, Landry T, O'Beirn F, Petersson E, Rheault RB, Strand O, Sundell K, Svaasand T, Wykfors GH, McKindsey CW (2018) Attraction and repulsion of mobile wild organisms to finfish and shellfish aquaculture: a review. Reviews Aquacult 10(4):924-949, DOI:10.1111/raq.12208
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Krome C, Schuele F, Jauncey K, Focken U (2018) Influence of a sodium formate / formic acid mixture on growth of juvenile common carp (Cyprinus carpio) fed different fishmeal replacement levels of detoxified Jatropha curcas kernel meal in practical, mixed diets. J Appl Aquacult 30(2):137-156, DOI:10.1080/10454438.2017.1412845
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Krome C, Jauncey K, Lohaus G, Focken U (2018) Phytate analysis and phytase application in Jatropha curcas kernel meal for use in aquaculture feeds. AACL Bioflux 11(3):690-700
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Kusche H, Hillgruber N, Rößner Y, Focken U (2018) The effect of different fish feed compositions on delta13C and δ15N signatures of sea bass and its potential value for tracking mariculture-derived nutrients. Isotopes Environ Health Stud 54(1):28-40, DOI:10.1080/10256016.2017.1361419
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Barreto-Curiel F, Focken U, D'Abramo LR, Cuarón JA, Viana MT (2018) Use of isotopic enrichment to assess the relationship among dietary protein levels, growth and nitrogen retention in juvenile Totoaba macdonaldi. Aquaculture 495:794-802, DOI:10.1016/j.aquaculture.2018.06.001
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Lasner T, Brinker A, Nielsen R, Rad F (2017) Establishing a benchmarking for fish farming - Profitability, productivity and energy efficiency of German, Danish and Turkish rainbow trout grow-out systems. Aquacult Res 48(6):3134-3148, DOI:10.1111/are.13144
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Mayrhofer R, Menanteau-Ledouble S, Pucher J, Focken U, El-Matbouli M (2017) Leaves from banana (Musa nana) and maize (Zea mays) have no phyto-prophylactic effects on the susceptibility of grass carp (Ctenopharyngodon idella) to Aeromonas hydrophila infection. BMC Vet Res 13:329, DOI:10.1186/s12917-017-1255-5
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Barreto-Curiel F, Focken U, D'Abramo LR, Viana MT (2017) Metabolism of Seriola lalandi during starvation as revealed by fatty acid analysis and compound-specific analysis of stable isotopes within amino acids. PLOS One 12(1):e0170124, DOI:10.1371/journal.pone.0170124
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Kusche H, Hillgruber N, Rößner Y, Focken U (2017) Plant protein-based feeds and commercial feed enable isotopic tracking of aquaculture emissions into marine macrozoobenthic bioindicator species. Isotopes Environ Health Stud 53(3):261-273, DOI:10.1080/10256016.2016.1267166
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Pucher J, Focken U (2017) Uptake of nitrogen from natural food into fish in differently managed polyculture ponds using 15N as tracer. Aquaculture Int 25(1):87-105, DOI:10.1007/s10499-016-0015-z
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Nguyen NT, Pucher J, Becker K, Focken U (2016) Earthworm powder as an alternative protein source in diets for common carp (Cyprinus carpioL.). Aquacult Res 47(9):2917-2927, DOI:10.1111/are.12743
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Krome C, Focken U (2016) Effects of earthworm, Perionyx excavatus meal in practical diets on growth and body composition of common carp, Cyprinus carpio. AACL Bioflux 9(2):340-344
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Breitenbach J, Nogueira Marilise, Farrè G, Zhu C, Capell T, Christou P, Fleck G, Focken U, Fraser PD, Sandmann G (2016) Engineered maize as a source of astaxanthin: processing and application as fish feed. Transgenic Res 25(6):785-793, DOI:10.1007/s11248-016-9971-3
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Mayrhofer R, Pucher J, Saleh M, Menanteau-Ledouble S, Bergmann S, Focken U, El-Matbouli M (2016) First detection of Cyprinid Herpesvirus 3 in cultured common carp in Vietnam. Fish Pathol 51(1):28-31, DOI:10.3147/jsfp.51.28
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Krome C, Jauncey K, Focken U (2016) Jatropha curcas kernel meal as a replacement for fishmeal in practical Nile tilapia, Oreochromis niloticus feeds. AACL Bioflux 9(3):590-596
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Pucher J, Mayrhofer R, El-Matbouli M, Focken U (2014) 15N tracer application to evaluate nitrogen dynamics of food webs in two subtropical small-scale aquaculture ponds under different managements. Isotopes Environ Health Stud:in Press, DOI:10.1080/10256016.2014.922963
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Pucher J, Nguyen NT, Trinh THY, Mayrhofer R, El-Matbouli M, Focken U (2014) Earthworm meal as fishmeal replacement in plant based feeds for Common Carp in semi-intensive aquaculture in rural northern Vietnam. Turk J Fish & Aquat Sci 14:557-565, DOI:10.4194/1303-2712-v14_2_27
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Krome C, Jauncey K, Fedderke S, Focken U (2014) Effect of replacing different levels on dietary fishmeal with Jatropha carcas kernel meal on the development of Nile tilapia Oreochromis niloticus (Linnaeus, 1758). J Appl Ichthyol 30:507-512, DOI:10.1111/jai.12414
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Lasner T, Hamm U (2014) Exploring ecopreneurship in the Blue Growth: a grounded theory approach [online]. Ann Marine Sociol 23:4-20, zu finden in <http://rsm.czasopisma.pan.pl/images/data/rsm/wydania/No_XXIII_2014/AMSXXIII_2014_Lasner_Hamm.pdf> [zitiert am 24.04.2015]
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Pucher J, Gut T, Mayrhofer R, El-Matbouli M, Viet PH, Ngoc NT, Lamers M, Streck T, Focken U (2014) Pesticide-contaminated feeds in integrated grass carp aquaculture: toxicology and bioaccumulation. Dis Aquat Organ 108:137-147, doi:10.3354/dao02710
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Pucher J, Mayrhofer R, El-Matbouli M, Focken U (2014) Pond management strategies for small-scale aquaculture in northern Vietnam: fish production and economic performance. Aquaculture Int 23(1):297-314, DOI:10.1007/s10499-014-9816-0
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Krome C, Jauncey K, Focken U (2014) Testing two different phytases in Jatrophas carcas kernel meal based diets for Nile tilapia, Oreochromis nilticus. Israeli J Aquacult(Spec. Iss.):1-11
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Mamun SM, Focken U, Becker K (2013) A respirometer system to measure critical and recovery oxygen tensions of fish under simulated diurnal fluctuations in dissolved oxygen. Aquaculture Int 21(1):31-44, DOI:10.1007/s10499-012-9529-1
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Krome C, Jauncey K, Focken U (2013) Comparison of photometric methods for determination of phytate in Jatropha carcass kernel meal (JKM). Proc Soc Nutr Physiol 22:62
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Stadtlander T, Levavi Sivan B, Kerem Z, Dweik H, Qutob M, Abu-Lafi S, Francis G, Focken U (2013) Effects of a saponin fraction extracted from Trigonella foenum-graecum L. and two commercially available saponins on sex ratio and gonad histology of Nile tilapa fry, Oreochromis niloticus (L.). J Appl Ichthyol 29(1):265-267, DOI:10.1111/jai.12002
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Pucher J, Steinbronn S, Mayrhofer R, Schad I, El-Matbouli M, Focken U (2013) Improved sustainable aquaculture systems for small-scale farmers in Northern Vietnam. In: Fröhlich HL, Schreinemachers P, Stahr K, Clemens G (eds) Sustainable land use and rural development in Southeast Asia: innovations and policies for mountainous areas. New York; Berlin; Heidelberg: Springer, pp 281-317
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Gaye-Siessegger J, Mamun SM, Brinker A, Focken U (2013) Improving estimates of trophic (Delta-trophic) for diet reconstruction studies using enzyme activities. Comp Biochem Physiol A Mol Integr Physiol 164(4):579-583, DOI:10.1016/j.cbpa.2013.01.003
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Nguyen NT, Focken U (2012) Earthworms as a potential source of animal protein for aquafeeds for common carp. Proc Soc Nutr Physiol(21):167
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Schober Gonçalves Lima J, Ccopa Rivera E, Focken U (2012) Emergy evaluation of organic and conventional marine shrimp farms in Guaraíra Lagoon, Brazil. J Cleaner Prod 35:194-202, DOI:10.1016/j.jclepro.2012.05.009
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Harter T, Buhrke F, Kumar V, Focken U, Makkar HPS, Becker K (2011) Substitution of fish meal by Jatropha curcas kernel meal: Effects on growth performance and body composition of white leg shrimp (Litopenaeus vannamei). Aquacult Nutr 17(5):542-548, DOI:10.1111/j.1365-2095.2010.00845.x
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Gaye-Siessegger J, McCullagh JS, Focken U (2011) The effect of dietary amino acid abundance and isotopic composition on the growth rate, metabolism and tissue ð13C of rainbow trout. Brit J Nutr 105(12):1764-1771, DOI:10.1017/S0007114510005696
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Dongmeza E, Francis G, Steinbronn S, Focken U, Becker K (2010) Investigations on the digestibility and metabolizability of the major nutrients and energy of maize leaves and barnyard grass in grass carp (Ctenopharyngodon idella). Aquacult Nutr 16(3):313-326, DOI:10.1111/j.1365-2095.2009.00667.x
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McCullagh JS, Gaye-Siessegger J, Focken U (2010) Studies on amino acid metabolism in rainbow trout: effect of dietary amino acid composition on growth performance and Omega13 C of amino acids. EAAP Sci Ser 127:143-144
