Juan Santos

Address: Alter Hafen Süd 2
18069 Rostock
Phone: +49 381 66099 122
Fax: +49 381 66099 199
E-Mail: juan.santos@thuenen.de

Fields of activity

Bycatch reduction in active and passive fisheries
Development and testing of fishing gear technologies to address species and size selectivity in mixed fisheries
Sampling scheme planning and cruise leadership in experimental sea trials
Quantitative and qualitative assessment of species/size selection and relative catchability of fishing gears

Research interests

Fishing gears, trawl hydrodynamics and efficiency, trawl size selection, species selection in mixed fisheries, bycatch, fishing discards, fish behaviour, sampling design, programming, computer simulation, statistics (parametric and non-parametric regression tools, Mixed modelling, non-parametric inference tools [bootstrapping, jackknife, cross-validation and others], multivariate analysis)

Scientific background

Since Jan. 2013: Senior Researcher at the Thuenen Institute of Baltic Sea Fisheries, Rostock, Germany

2009 - 2012: Instituto Espanol de Oceanografıa, Vigo, Spain, Research technician (UE (DCR)-IEO)

Monitoring the behavior of Spanish fisheries operating in ICES areas in relation with future by-catch and discards EU policy
Selective gear design for by-catch reduction in ICES areas
Selectivity projects management and monitoring. Data analysis
Dissemination of effects of discard reduction technical measures tofishers
Keep track of the laws and rules applicable to Spanish fisheries in ICESareas, and coordination with European researchers in the task of applytechnical measures for by-catch reduction
Preparation and presentation of discards data from ICES fleets for demandinginstitutions
Participation in research surveys related with DCF

Sep. 2007: M.S.Marine Biology and Aquaculture, Universidade de Santiago de Compostela,Santiago de Compostela, Spain. Thesis Topic: A comparison of two methods for discards estimation incommercial fishing vessels. Adviser:Professor Manuel Aldegunde.

Oct. 2006 - Feb. 2007: Selectivity project RAI-AP-10/2006

Jul. 2006 - Oct. 2006: Spanish Discard Sampling Programme

Oct. 2005 - Mar. 2006: Selectivity project RAI-AP-21/2005

Nov. 2004 - Sep. 2005: Spanish Discard Sampling Programme

Jun. 2004 to Nov. 2005: Spanish Pelagic Longline Sampling Programme

Dec. 2002: Degree in Biology Science

Publications

Results 1 - 10 of 30

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Chladek J-C, Stepputtis D, Hermann A, Ljungberg P, Rodriguez-Tress P, Santos J, Svendsen JC (2021) Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod (Gadus morhua). ICES J Mar Sci 78(1):199-219, DOI:10.1093/icesjms/fsaa214
Polte P, Gröhsler T, Kotterba P, Nordheim L von, Moll D, Santos J, Rodriguez-Tress P, Zablotski Y, Zimmermann C (2021) Reduced reproductive success of Western Baltic herring (Clupea harengus) as a response to warming winters. Front Mar Sci 8:589242, DOI:10.3389/fmars.2021.589242
pdf document (limited accessibility) 3767 kb
Günther C, Temming A, Santos J, Berkenhagen J, Stepputtis D, Schultz S, Neudecker T, Kraus G, Bethke E, Hufnagl M (2021) Small steps high leaps: Bio-economical effects of changing codend mesh size in the North Sea Brown shrimp fishery. Fish Res 234:105797, DOI:10.1016/j.fishres.2020.105797
Chladek J-C, Stepputtis D, Hermann A, Kratzer I, Ljungberg P, Rodriguez-Tress P, Santos J, Svendsen JC (2021) Using an innovative net-pen-based observation method to assess and compare fish pot-entrance catch efficiency for Atlantic cod (Gadus morhua). Fish Res 236:105851, DOI:10.1016/j.fishres.2020.105851
Stepputtis D, Santos J, Mieske B, Lichtenstein U, Schütz A, Stechert R (2020) Abschlussbericht an das Ministerium für Landwirtschaft und Umwelt Mecklenburg-Vorpommern für das Projekt CODEX (CodExcluder) - Netzmodifikation zur Reduktion des Dorschbeifanges. Rostock: Thünen Institute of Baltic Sea Fisheries, 99 p
pdf document (limited accessibility) 10482 kb
Herrmann B, Sistiaga M, Larsen RB, Brinkhof J, Gjøsund SH, Jacques N, Santos J (2020) Catch pattern and size selectivity for a gear designed to prevent fish injuries during the capture process in a North-East Atlantic demersal trawl fishery. Reg Studies Mar Sci 40:101525, DOI:10.1016/j.rsma.2020.101525
pdf document (limited accessibility) 2049 kb
Sistiaga M, Herrmann B, Brinkhof J, Larsen RB, Jacques N, Santos J, Gjøsund SH (2020) Quantification of gear inflicted damages on trawl-caught haddock in the Northeast Atlantic fishery. Mar Pollut Bull 157:111366, DOI:10.1016/j.marpolbul.2020.111366
pdf document (limited accessibility) 1776 kb
Santos J, Herrmann B, Stepputtis D, Kraak SBM, Gökce G, Mieske B (2020) Quantifying the performance of selective devices by combining analysis of catch data and fish behaviour observations: methodology and case study on a flatfish excluder. ICES J Mar Sci 77(7-8):2840-2856, DOI:10.1093/icesjms/fsaa155
Stepputtis D, Santos J, Zimmermann C (2020) Technical approaches to avoid cod catches in Baltic Sea trawl fisheries : A report for the BALTFISH high level group. Rostock: Thünen Institute of Baltic Sea Fisheries, 37 p
pdf document (limited accessibility) 9258 kb
Eero M, Carlshamre S, Stepputtis D, Krumme U, Maioli F, Prista N, Schade FM, Santos J, Noack T, Valentinsson D, Nilsson H, Feekings JP, Storr-Paulsen M, Plikshs M, Bergström U, Hakansson KB, Radtke K (2019) Report on eastern baltic cod bycatch in non-targeted fisheries, mixing with western baltic cod in SD24, and stock situation in SDS 27-32. Copenhagen: ICES, 69 p, ICES Sci Rep 1(76), DOI:10.17895/ices.pub.5635