Clara Ulrich

Clara Ulrich

Deputy Head of Science

Direction Scientifique (PDG-DS)

Contact form

+33 (0)2 40 37 41 66

Employer : Ifremer

Site : Nantes

Postal address : Centre Atlantique - Rue de l'Ile d'Yeu - BP 21105 - 44311 Nantes Cedex 03


ORCID orcid icon : 0000-0001-7598-2051



Plet-Hansen Kristian S, Bastardie François, Ulrich Clara The value of commercial fish size distribution recorded at haul by haul compared to trip by trip . ICES Journal of Marine Science IN PRESS .
Calderwood Julia, Plet-Hansen Kristian Schreiber, Ulrich Clara, Reid David G, Kraak Sarah Fishing for euros: how mapping applications can assist in maintaining revenues under the Landing Obligation . ICES Journal of Marine Science IN PRESS .
Helmond Aloysius T.M., Mortensen Lars O., Plet‐hansen Kristian S., Ulrich Clara, Needle Coby L., Oesterwind Daniel, Kindt‐larsen Lotte, Catchpole Thomas, Mangi Stephen, Zimmermann Christopher, Olesen Hans Jakob, Bailey Nick, Bergsson Heidrikur, Dalskov Jørgen, Elson Jon, Hosken Malo, Peterson Lisa, McElderry Howard, Ruiz Jon, Pierre Johanna P, Dykstra Claude, Jaap Poos Jan (2020). Electronic monitoring in fisheries: Lessons from global experiences and future opportunities . Fish And Fisheries , 21(1), 162-189 . Publisher's official version : , Open Access version :
Petitgas Pierre, Ulrich Clara, Auber Arnaud, Gourguet Sophie, Huret Martin, Mazurais David, Pernet Fabrice, Pouvreau Stephane, Richard Marion, Servili Arianna, Thebaud Olivier, Zambonino Infante Jose-Luis (2020). Conséquences du changement climatique sur les écosystèmes marins exploités par la pêche et la conchyliculture . Etudes Marines , (18), 40-53 .


Plet-Hansen Kristian S., Bergsson Heidrikur, Ulrich Clara (2019). More data for the money: Improvements in design and cost efficiency of electronic monitoring in the Danish cod catch quota management trial . Fisheries Research , 215, 114-122 .
Macher Claire, Steins Nathalie A., Ballesteros Marta, Kraan Marloes, Frangoudes Katia, Bailly Denis, Bertignac Michel, Colloca Francesco, Fitzpatrick Mike, Garcia Dorleta, Little Rich, Mardle Simon, Murillas Arantza, Pawlowski Lionel, Philippe Manuelle, Prellezo Raul, Sabatella Evelina, Thebaud Olivier, Ulrich Clara (2019). Roles and impacts of science and interactions with stakeholders and decision makers in decision-support to fisheries management: sharing experiences and practices from an inter-disciplinary collective of researchers . 2019 Future Oceans2 IMBeR Open Science Conference, 17-21 June 2019, Brest, France .
Eliasen Soren Qvist, Feekings Jordan, Krag Ludvig, Veiga-Malta Tiago, Mortensen Lars O., Ulrich Clara (2019). The landing obligation calls for a more flexible technical gear regulation in EU waters - Greater industry involvement could support development of gear modifications . Marine Policy , 99, 173-180 .
Vermard Youen, Ulrich Clara, Mahevas Stephanie, Cornou Anne Sophie, Dubroca Laurent, Bouch Paul, Brunel Thomas, Depestele Jochen, Garcia Dorleta, Hakanson Kirsten, Irondo Ane, Moore Claire, Ribeirosantos Ana, Wischnewski Julia (2019). Identification of target and bycatch species for european fleets In the context of the Multi Annual Plans . ASC 2019 - ICES Annual Science Conference. 9-13 September 2019, Gothenburg, Sweden .
Uhlmann Sven Sebastian, Ulrich Clara, Kennelly Steven J (2019). The European Landing Obligation. Reducing Discards in Complex, Multi-Species and Multi-Jurisdictional Fisheries . Springer Science and Business Media LLC.
Aranda Martin, Ulrich Clara, Le Gallic Bertrand, Borges Lisa, Metz Sébastien, Prellezo Raul, Santurtun Marina (2019). Étude pour PECH — La politique de la pêche de l’UE – dernières évolutions et défis à venir / Research for PECH Committee — EU fisheries policy – latest developments and future challenges .


Nielsen J. Rasmus, Thunberg Eric, Holland Daniel S., Schmidt Jorn O., Fulton Elizabeth A., Bastardie Francois, Punt Andre E., Allen Icarus, Bartelings Heleen, Bertignac Michel, Bethke Eckhard, Bossier Sieme, Buckworth Rik, Carpenter Griffin, Christensen Asbjorn, Christensen Villy, Da-Rocha Jose M., Deng Roy, Dichmont Catherine, Doering Ralf, Esteban Aniol, Fernandes Jose A., Frost Hans, Garcia Dorleta, Gasche Loic, Gascuel Didier, Gourguet Sophie, Groeneveld Rolf A., Guillen Jordi, Guyader Olivier, Hamon Katell, Hoff Ayoe, Horbowy Jan, Hutton Trevor, Lehuta Sigrid, Little L. Richard, Lleonart Jordi, Macher Claire, Mackinson Steven, Mahevas Stephanie, Marchal Paul, Mato-Amboage Rosa, Mapstone Bruce, Maynou Francesc, Merzereaud Mathieu, Palacz Artur, Pascoe Sean, Paulrud Anton, Plaganyi Eva, Prellezo Raul, Van Putten Elizabeth I., Quaas Martin, Ravn-Jonsen Lars, Sanchez Sonia, Simons Sarah, Thebaud Olivier, Tomczak Maciej T., Ulrich Clara, Van Dijk Diana, Vermard Youen, Voss Rudi, Waldo Staffan (2018). Integrated ecological-economic fisheries models-Evaluation, review and challenges for implementation . Fish And Fisheries , 19(1), 1-29 . Publisher's official version : , Open Access version :
Jardim Ernesto, Eero Margit, Silva Alexandra, Ulrich Clara, Pawlowski Lionel, Holmes Steven J., Ibaibarriaga Leire, De Oliveir Jose A. A. A., Riveiro Isabel, Alzorriz Nekane, Citores Leire, Scott Finlay, Uriarte Andres, Carrera Pablo, Duhamel Erwan, Mosqueira Iago (2018). Testing spatial heterogeneity with stock assessment models . Plos One , 13(1), e0190791 (1-23) . Publisher's official version : , Open Access version :
Mortensen Lars O., Ulrich Clara, Hansen Jan, Hald Rasmus (2018). Identifying choke species challenges for an individual demersal trawler in the North Sea, lessons from conversations and data analysis . Marine Policy , 87, 1-11 .
Taylor Marc, Kempf Alexander, Brunel Thomas, Ulrich Clara, Vermard Youen, Garcia Dorleta (2018). Estimating the impacts of Common Fisheries Policy implementation to North Sea demersal fisheries using a bioeconomic mixed fisheries model . ASC 2018 - ICES Annual Science Conference. 24-27 september 2018, Hamburg.


Mortensen Lars O., Ulrich Clara, Eliasen Soren, Olesen Hans Jakob (2017). Reducing discards without reducing profit: free gear choice in a Danish result-based management trial . Ices Journal Of Marine Science , 74(5), 1469-1479 .
Ulrich Clara, Vermard Youen, Dolder Paul J., Brunel Thomas, Jardim Ernesto, Holmes Steven J., Kempf Alexander, Mortensen Lars O., Poos Jan-Jaap, Rindorf Anna (2017). Achieving maximum sustainable yield in mixed fisheries: a management approach for the North Sea demersal fisheries . Ices Journal Of Marine Science , 74(2), 566-575 . Publisher's official version : , Open Access version :
Mortensen Lars O., Ulrich Clara, Olesen Hans Jakob, Bergsson Heidrikur, Berg Casper W., Tzamouranis Nikolaos, Dalskov Jorgen (2017). Effectiveness of fully documented fisheries to estimate discards in a participatory research scheme . Fisheries Research , 187, 150-157 .
Rindorf Anna, Dichmont Catherine Mary, Levin Phillip S., Mace Pamela, Pascoe Sean, Prellezo Raul, Punt Andre E., Reid David G., Stephenson Robert, Ulrich Clara, Vinther Morten, Clausen Lotte Worsoe (2017). Food for thought: pretty good multispecies yield . Ices Journal Of Marine Science , 74(2), 475-486 .
Plet-Hansen Kristian S., Eliasen Soren Q., Mortensen Lars O., Bergsson Heiorikur, Olesen Hans J., Ulrich Clara (2017). Remote electronic monitoring and the landing obligation - some insights into fishers' and fishery inspectors' opinions . Marine Policy , 76, 98-106 . Publisher's official version : , Open Access version :
Ulrich Clara, Hemmer-Hansen Jakob, Boje Jesper, Christensen Asbjorn, Hussy Karin, Sun Hailu, Worsoe Clausen Lotte (2017). Variability and connectivity of plaice populations from the Eastern North Sea to the Baltic Sea, part II. Biological evidence of population mixing . Journal Of Sea Research , 120, 13-23 .


Marchal Paul, Andersen Jesper Levring, Aranda Martin, Fitzpatrick Mike, Goti Leyre, Guyader Olivier, Haraldsson Gunnar, Hatcher Aaron, Hegland Troels Jacob, Le Floc h Pascal, Macher Claire, Malvarosa Loretta, Maravelias Christos D., Mardle Simon, Murillas Arantza, Nielsen J. Rasmus, Sabatella Rosaria, Smith Anthony D. M., Stokes Kevin, Thoegersen Thomas, Ulrich Clara (2016). A comparative review of fisheries management experiences in the European Union and in other countries worldwide: Iceland, Australia, and New Zealand . Fish And Fisheries , 17(3), 803-824 . Publisher's official version : , Open Access version :
Kempf Alexander, Mumford John, Levontin Polina, Leach Adrian, Hoff Ayoe, Hamon Katell, Bartelings Heleen, Vinther Morten, Staebler Moritz, Poos Jan Jaap, Smout Sophie, Frost Hans, Van Den Burg Sander, Ulrich Clara, Rindorf Anna (2016). The MSY concept in a multi-objective fisheries environment - Lessons from the North Sea . Marine Policy , 69, 146-158 .


Ulrich Clara, Olesen Hans Jakob, Bergsson Heidrikur, Egekvist Josefine, Hakansson Kirsten Birch, Dalskov Jorgen, Kindt-Larsen Lotte, Storr-Paulsen Marie (2015). Discarding of cod in the Danish Fully Documented Fisheries trials . Ices Journal Of Marine Science , 72(6), 1848-1860 . Publisher's official version : , Open Access version :


Ulrich Clara, Boje Jesper, Cardinale Massimiliano, Gatti Paul, Lebras Quentin, Andersen Michael, Hemmer-Hansen Jakob, Hintzen Niels T., Jacobsen Jonathan B., Jonsson Patrik, Miller David C. M., Nielsen Einar E., Rijnsdorp Adriaan D., Skold Mattias, Svedang Henrik, Wennhage Hakan (2013). Variability and connectivity of plaice populations from the Eastern North Sea to the Western Baltic Sea, and implications for assessment and management . Journal Of Sea Research , 84, 40-48 .
Beare Doug, Rijnsdorp Adriaan D., Blaesberg Mette, Damm Ulrich, Egekvist Josefine, Fock Heino, Kloppmann Matthias, Rockmann Christine, Schroeder Alexander, Schulze Torsten, Tulp Ingrid, Ulrich Clara, Van Hal Ralf, Van Kooten Tobias, Verweij Marieke (2013). Evaluating the effect of fishery closures: Lessons learnt from the Plaice Box . Journal Of Sea Research , 84, 49-60 .
Kraak Sarah B. M., Bailey Nick, Cardinale Massimiliano, Darby Chris, De Oliveira Jose A.A., Eero Margit, Graham Norman, Holmes Steven, Jakobsen Tore, Kempf Alexander, Kirkegaard Eskild, Powell John, Scott Robert D., Simmonds E. John, Ulrich Clara, Vanhee Willy, Vinther Morten (2013). Lessons for fisheries management from the EU cod recovery plan . Marine Policy , 37, 200-213 .


Ulrich Clara, Wilson Douglas C. K., Nielsen J. Rasmus, Bastardie Francois, Reeves Stuart A., Andersen Bo S., Eigaard Ole R. (2012). Challenges and opportunities for fleet- and metier-based approaches for fisheries management under the European Common Fishery Policy . Ocean & Coastal Management , 70, 38-47 .
Iriondo Ane, Garcia Dorleta, Santurtun Marina, Castro Jose, Quincoces Inaki, Lehuta Sigrid, Mahevas Stephanie, Marchal Paul, Tidd Alex, Ulrich Clara (2012). Managing mixed fisheries in the European Western Waters: Application of Fcube methodology . Fisheries Research , 134-136, 6-16 .
Rockmann Christine, Ulrich Clara, Dreyer Marion, Bell Ewen, Borodzicz Edward, Haapasaari Paivi, Hauge Kjellrun Hiis, Howell Daniel, Mantyniemi Samu, Miller David, Tserpes George, Pastoors Martin (2012). The added value of participatoly modelling in fisheries management - what has been learnt? Marine Policy , 36(5), 1072-1085 . Publisher's official version : , Open Access version :
Maravelias C. D., Damalas D., Ulrich Clara, Katsanevakis S., Hoff A. (2012). Multispecies fisheries management in the Mediterranean Sea: application of the Fcube methodology . Fisheries Management And Ecology , 19(3), 189-199 .
Hintzen Niels T., Bastardie Francois, Beare Doug, Piet Gerjan J., Ulrich Clara, Deporte Nicolas, Egekvist Josefine, Degel Henrik (2012). VMStools: Open-source software for the processing, analysis and visualisation of fisheries logbook and VMS data . Fisheries Research , 115, 31-43 .
Deporte Nicolas, Ulrich Clara, Mahevas Stephanie, Demaneche Sebastien, Bastardie Francois (2012). Regional metier definition: a comparative investigation of statistical methods using a workflow applied to international otter trawl fisheries in the North Sea . Ices Journal Of Marine Science , 69(2), 331-342 . Publisher's official version : , Open Access version :
Andersen Bo Solgaard, Ulrich Clara, Eigaard Ole Ritzau, Christensen Anne-Sofie (2012). Short-term choice behaviour in a mixed fishery: investigating metier selection in the Danish gillnet fishery . Ices Journal Of Marine Science , 69(1), 131-143 .


Ulrich Clara, Reeves Stuart A., Vermard Youen, Holmes Steven J., Vanhee Willy (2011). Reconciling single-species TACs in the North Sea demersal fisheries using the Fcube mixed-fisheries advice framework . Ices Journal Of Marine Science , 68(7), 1535-1547 . Publisher's official version : , Open Access version :


Hoff Ayoe, Frost Hans, Ulrich Clara, Damalas Dimitrios, Maravelias Christos D., Goti Leyre, Santurtun Marina (2010). Economic effort management in multispecies fisheries: the FcubEcon model . Ices Journal Of Marine Science , 67(8), 1802-1810 .
Bastardie Francois, Nielsen J. Rasmus, Ulrich Clara, Egekvist Josefine, Degel Henrik (2010). Detailed mapping of fishing effort and landings by coupling fishing logbooks with satellite-recorded vessel geo-location . Fisheries Research , 106(1), 41-53 .
Baudron Alan, Ulrich Clara, Nielsen J. Rasmus, Boje Jesper (2010). Comparative evaluation of a mixed-fisheries effort-management system based on the Faroe Islands example . Ices Journal Of Marine Science , 67(5), 1036-1050 .
Andersen Bo Solgaard, Vermard Youen, Ulrich Clara, Hutton Trevor, Poos Jan-Jaap (2010). Challenges in integrating short-term behaviour in a mixed-fishery Management Strategies Evaluation frame: A case study of the North Sea flatfish fishery . Fisheries Research , 102(1-2), 26-40 .
Bastardie Francois, Vinther Morten, Nielsen J. Rasmus, Ulrich Clara, Paulsen Marie Storr (2010). Stock-based vs. fleet-based evaluation of the multi-annual management plan for the cod stocks in the Baltic Sea . Fisheries Research , 101(3), 188-202 .


Ulrich Clara, Andersen Bo Solgaard, Sparre Per J., Nielsen J. Rasmus (2007). TEMAS: fleet-based bio-economic simulation software to evaluate management strategies accounting for fleet behaviour . Ices Journal Of Marine Science , 64(4), 647-651 .
Hamon Katell, Ulrich Clara, Hoff A., Kell L. T. (2007). Evaluation of Management Strategies for the Mixed North Sea Roundfish Fisheries with the FLR Framework . Modsim 2007: International Congress On Modelling And Simulation: Land, Water And Environmental Management: Integrated Systems For Sustainability. ISBN:978-0-9758400-4-7 pp.2813-2819 .


Marchal Paul, Andersen B, Bromley D, Iriondo A, Mahevas Stephanie, Quirijns F, Rackham B, Santurtun M, Tien N, Ulrich Clara (2006). Improving the definition of fishing effort for important European fleets by accounting for the skipper effect . Canadian journal of fisheries and aquatic sciences , 63(3), 510-533 . Open Access version :
Kell L, Pilling G, Kirkwood G, Pastoors M, Mesnil Benoit, Korsbrekke K, Abaunza P, Aps R, Biseau Alain, Kunzlik P, Needle C, Roel B, Ulrich Clara (2006). An evaluation of multi-annual management strategies for ICES roundfish stocks . ICES Journal of Marine Science , 63(1), 12-24 . Publisher's official version : , Open Access version :


Kell Lt, Pilling Gm, Kirkwood Gp, Pastoors M, Mesnil Benoit, Korsbrekke K, Abaunza P, Aps R, Biseau Alain, Kunzlik P, Needle C, Roel Ba, Ulrich-Rescan Clara (2005). An evaluation of the implicit management procedure used for some ICES roundfish stocks . Ices Journal Of Marine Science , 62(4), 750-759 .


Ulrich Clara, Andersen Bs (2004). Dynamics of fisheries, and the flexibility of vessel activity in Denmark between 1989 and 2001 . Ices Journal Of Marine Science , 61(3), 308-322 .


Marchal Paul, Ulrich Clara, Korsbrekke K, Pastoors M, Rackham B (2003). Annual trends in catchability and fish stock assessments . Scientia Marina , 67, 63-73 .


Ulrich Clara, Le Gallic Bertrand, Dunn Mr, Gascuel D (2002). A multi-species multi-fleet bioeconomic simulation model for the English Channel artisanal fisheries . Fisheries Research , 58(3), 379-401 .
Ulrich Clara, Marchal Paul (2002). Sensitivity of some biological reference points to shifts in exploitation patterns and inputs uncertainty for three North Sea demersal stocks . Fisheries Research , 58(2), 153-169 .
Marchal Paul, Ulrich Clara, Korsbrekke K, Pastoors M, Rackham B (2002). A comparison of three indices of fishing power on some demersal fisheries of the North Sea . Ices Journal Of Marine Science , 59(3), 604-623 .
Ulrich Clara, Pascoe S, Sparre Pj, De Wilde Jw, Marchal Paul (2002). Influence of trends in fishing power on bioeconomics in the North Sea flatfish fishery regulated by catches or by effort quotas . Canadian Journal Of Fisheries And Aquatic Sciences , 59(5), 829-843 .
Marchal Paul, Ulrich Clara, Pastoors M (2002). Area-based management and fishing efficiency . Aquatic Living Resources , 15(2), 73-85 . Publisher's official version : , Open Access version :


Ulrich Clara, Gascuel Didier, Dunn Matthew R, Le Gallic Bertrand, Dintheer Christian (2001). Estimation of technical interactions due to the competition for resource in a mixed-species fishery, and the typology of fleets and metiers in the English Channel . Aquatic Living Resources , 14(5), 267-281 . Publisher's official version : , Open Access version :