Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

    Records 1 - 20 / 177

    • help
    • print

      Print search results

    • export

      Export search results

    Check title to add to marked list
    Catch sampling of the pelagic freezer trawler fishery operating in European waters in 2017-2018: joint report of the Dutch and German national sampling programmes
    Overzee, H.M.J. ; Ulleweit, J. ; Helmond, A.T.M. van; Bangma, T. - \ 2020
    IJmuiden : Stichting Wageningen Research, Centre for Fisheries Research (CVO) (CVO report 20.004) - 53
    The pelagic freezer trawler fishery targets small pelagic species. The economically most important species are: herring (Clupea harengus), blue whiting (Micromesistius poutassou), horse mackerel (Trachurus trachurus), mackerel (Scomber scombrus), greater argentine (Argentina silus) and pilchard (Sardina pilchardus). The annual landings of this fishery follow seasonal patterns; different species are targeted during different parts of the year. The total landings of these target species by the Dutch fleet operating in European waters of were about 245,000 tonnes in 2017 and about 303,000 tonnes in 2018. The total landings of these target species by the German fleet operating in European waters were about 124,000 tonnes in 2017 and about 129,000 tonnes in 2018. Herring, blue whiting, mackerel and horse mackerel were the most abundant landed species. In the European Union the collection and management of fisheries data is regulated through the Data Collection Framework (DCF) of the European Commission (EC). Within this context, from 2002 onwards catches of the European freezer trawler fleet are sampled by the Netherlands and Germany through two separate observer programmes. A process to harmonize the pelagic on board sampling programmes has started a few years ago and is still continuing. This report presents a summary of the data collected in the two monitoring programmes in European waters during the period 2017 and 2018. The two programmes together correspond with a sampling coverage of around 15% and 11% of the total Dutch and German flagged pelagic freezer trawler fleet effort (expressed in number of trips) in European waters in 2017-2018, respectively. An important element in the reform of the Common Fisheries Policy (CFP) is the obligation to land all catches, i.e. the landing obligation. Consequently, from 2015 onwards the European pelagic freezer trawler fishery is in principle obliged to keep catches of quota regulated species on board. This has affected the sampling protocols and procedures; sampling has shifted from discards monitoring towards catch monitoring. Furthermore, the CFP also introduced the concept of regionalisation, meaning that Member States which share a fishing area should work together in collecting, managing and making the data available for scientific advice. Regionalisation of data collection was established during the recast of the Council Regulation describing the DCF (EU 2017/1004). Ultimately, under regional sampling, the Dutch and German pelagic sampling programmes are expected to merge together or at least be completely harmonised and thus interchangeable. Currently, the EU regional coordination group for the North Sea/Eastern Arctic & North Atlantic is working on a regional sampling plan for the freezer trawler fleet exploiting pelagic fisheries in the Northeast Atlantic.
    Electronic monitoring in fisheries: Lessons from global experiences and future opportunities
    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 ; Poos, Jan Jaap - \ 2020
    Fish and Fisheries 21 (2020)1. - ISSN 1467-2960 - p. 162 - 189.
    catch documnetation - discard monitoring - electronic monitoring - fully documented fisheries - video-based monitoring
    Since the beginning of the 21st century, electronic monitoring (EM) has emerged as a cost‐efficient supplement to existing catch monitoring programmes in fisheries. An EM system consists of various activity sensors and cameras positioned on vessels to remotely record fishing activity and catches. The first objective of this review was to describe the state of play of EM in fisheries worldwide and to present the insights gained on this technology based on 100 EM trials and 12 fully implemented programmes. Despite its advantages, and its global use for monitoring, progresses in implementation in some important fishing regions are slow. Within this context, the second objective was to discuss more specifically the European experiences gained through 16 trials. Findings show that the three major benefits of EM were as follows: (a) cost‐efficiency, (b) the potential to provide more representative coverage of the fleet than any observer programme and (c) the enhanced registration of fishing activity and location. Electronic monitoring can incentivize better compliance and discard
    reduction, but the fishing managers and industry are often reluctant to its uptake. Improved understanding of the fisher's concerns, for example intrusion of privacy, liability and costs, and better exploration of EM benefits, for example increased traceability, sustainability claims and market access, may enhance implementation on a larger scale. In conclusion, EM as a monitoring tool embodies various solid strengths that are not diminished by its weaknesses. Electronic monitoring has the opportunity to be a powerful tool in the future monitoring of fisheries, particularly when integrated within existing monitoring programmes.
    Kan automatische beeldherkenning helpen bij betere vangstregistratie? : Kunstmatige intelligentie
    Nguyen, Linh ; Helmond, A.T.M. van; Kootstra, G.W. - \ 2019
    Visserijnieuws (2019). - ISSN 1380-5061Visserijnieuws.nl
    De Oerakker voorjaarsbijeenkomst 2019
    Kik, Chris - \ 2019
    De voorjaarsbijeenkomst vond plaats op 3 juli bij de Stadstuin Helmond en bij de Collectieboomgaard van Ger van Santvoort te Someren. Aan deze bijeenkomst werd door ca. 25 personen deelgenomen.
    Improving data collection for rays
    Nguyen, Linh ; Helmond, Edwin van; Batsleer, Jurgen ; Poos, Jan Jaap ; Kootstra, Gert - \ 2019
    Zeer veel elzenpollen tijdens afgelopen lentedagen
    Weger, L.A. de; Koenders, Mieke ; Vliet, A.J.H. van; Wezel, Jaco van - \ 2019
    Nature Today
    De recente mooie lentedagen zijn gepaard gegaan met bijzonder hoge concentraties elzenpollen zeer vroeg in het jaar. De pollentelstations van het Leids Universitair Medisch Centrum, Elkerliek Ziekenhuis in Helmond en Philips in Drachten telden ook zeer hazelaarpollen. Veel mensen die gevoelig zijn voor boompollen hebben deze dagen flinke hooikoortsklachten gehad.
    Practical implementation of real-time fish classification from acoustic broadband echo sounder data
    Berges, B. ; Sande, J. van de; Quesson, B. ; Sakinan, S. ; Helmond, E. van; Heijningen, A. van; Burgraaf, D. ; Fassler, S. - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research report C076/19) - 150
    Evaluatie discardreductiedoelstelling aan de hand van het WMR discards WOT-programma en vergelijking van WMR zelfbemonstering versus sector monitoring
    Batsleer, J. ; Chen, C. ; Verkempynck, R. ; Helmond, A.T.M. van - \ 2019
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C005/19) - 41
    Tools and Technologies for the Monitoring, Control and Surveillance of Unwanted Catches
    James, Kelly M. ; Campbell, Neill ; Viðarsson, Jónas R. ; Vilas, Carlos ; Plet-Hansen, Kristian S. ; Borges, Lisa ; González, Óscar ; Helmond, A.T.M. van; Pérez-Martín, Ricardo I. ; Antelo, Luis Taboada ; Pérez-Bouzada, Jorge ; Ulrich, Clara - \ 2019
    In: The European Landing Obligation / Uhlmann, Sven Sebastian, Ulrich, Clara, Kennelly, Steven J., Springer International Publishing - ISBN 9783030033071 - p. 363 - 382.
    A key requirement for the successful implementation of the Landing Obligation is the need to monitor and regulate unwanted catches at sea. This issue is
    particularly challenging because of the large number of vessels and trips that need to be monitored and the remoteness of vessels at sea. Several options exist in theory, ranging from patrol vessels to onboard observers and self-sampling. Increasingly though, technology is developing to provide remote Electronic Monitoring (EM) with cameras at lower costs. This chapter first provides an overall synthesis of the pro’s and con’s of several monitoring tools and technologies. Four EM technologies already trialled in EU fisheries are then summarised. We conclude that it is now possible to conduct reliable and cost-effective monitoring of unwanted catches at sea, especially if various options are used in combination. However, effective monitoring is a necessary condition for the successful implementation of the Landing Obligation but insufficient unless it is implemented with a high level of coverage and with the support of the fishing industry.
    European experiences on the use of remote electronic monitoring
    Mortensen, L. ; Helmond, A.T.M. van; Plet-Hansen, Kristian ; Ulrich, C. ; Needle, C. ; Oesterwind, D. ; Kindt-Larsen, L. ; Catchpole, T. ; Mangi, Stephen ; Zimmermann, C. ; Olesen, Hans Jakob ; Bailey, N. ; Bergsson, Heidrikur ; Dalskov, J. ; Elson, Jon ; Hosken, Malo ; Poos, J.J. - \ 2018
    - 1 p.
    The CatchCam system: An easy solution to improve monitoring on commercial vessels
    Helmond, A.T.M. van; Benden, D.P.L.D. ; Burggraaf, D. ; Poos, J.J. - \ 2018
    Nieuw-Zeelandse visser vreest big brother aan boord
    Helmond, Edwin van - \ 2018
    Voeding en gezond ouder worden
    Groot, Lisette de - \ 2018
    Practical implementation of real-time fish classification from acoustic broadband echo sounder data - RealFishEcho progress report : Year 2 - June 201
    Berges, B.J.P. ; Sakinan, S. ; Helmond, A.T.M. van - \ 2018
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C062/18) - 42
    The EU has by means of new policy restricted the discarding of fish at sea. As a result, the fishing industry now requires improved methods to identify fish species and size before the catch process begins. With the introduction of robust broadband echosounders (i.e. downward looking sonar) on the market, active acoustic data now have the potential for improved target discrimination for both type and size (i.e. determine fish species and size).The aim of this project is to develop methods for fish classification and size estimation based on data collected on board commercial vessel equipped with broadband echosounders. These methods will then be implemented into a software package for near-real time viewing. Such a software package would help skippers to take better-informed decisions while fishing.This project runs over three years (June 2016 to June 2019) in collaboration between Wageningen Marine Research (WMR), Redersvereniging voor de Zeevisserij (RVZ) and TNO. Progress made in the second year of the project is presented in this report.Through the course of the reporting period, substantial amount of data have been collected and analysis show promising results. A test version of the classification software is planned to be deployed in the next phase of the project.
    Controls on the onset and termination of past hypoxia in the Baltic Sea
    Papadomanolaki, Nina M. ; Dijkstra, Nikki ; Helmond, Niels A.G.M. Van; Hagens, Mathilde ; Bauersachs, Thorsten ; Kotthoff, Ulrich ; Sangiorgi, Francesca ; Slomp, Caroline P. - \ 2018
    Palaeogeography Palaeoclimatology Palaeoecology 490 (2018). - ISSN 0031-0182 - p. 347 - 354.
    The Baltic Sea is currently the largest marine hypoxic (O2 < 2 mg L− 1) ‘dead zone’ following excessive nutrient input from anthropogenic activities over the past century. Widespread hypoxia has previously developed in the Baltic Sea during the Holocene Thermal Maximum (HTM; 8–4 ka before present; BP) and the Medieval Climate Anomaly (MCA; 1.4–0.7 ka BP). Here we study the mechanisms that contributed to the onset and termination of this past hypoxia using geochemical and marine palynological data from a sediment record retrieved from the Landsort Deep during IODP Expedition 347 (Site M0063). Dinoflagellate cyst records and TEX86L-based sea surface temperature reconstructions indicate a major increase in salinity and temperature prior to and across the onset of the HTM hypoxic interval, underlining the importance of both temperature and salinity stratification in providing conditions conducive to the onset of hypoxia. Both salinity and temperature decline during the termination of the HTM hypoxic interval. In contrast, we find no evidence for significant changes in surface salinity during the MCA hypoxic interval and both the onset and termination of hypoxia appear to have been primarily driven by changes in temperature. Our results indicate that temperature and salinity changes were key drivers of past hypoxia in the Baltic Sea and imply that ongoing climate change will delay recovery from the modern, nutrient-driven hypoxic event in the Baltic Sea.
    Practical implementation of real-time fish classification from acoustic broadband echo sounder data - RealFishEcho : classification algorithm improvements
    Berges, B.J.P. ; Helmond, A.T.M. van - \ 2018
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C010/18) - 15
    The EU has by means of new policy restricted the discarding of fish at sea, including bycatch and slipping. As a result, the fishing industry now requires improved methods to identify fish species and size before the catch process begins. With the introduction of robust broadband echosounder (i.e. downward looking sonar) on the market, active acoustic data now have the potential for improved target discrimination for both type and size (i.e. determine fish species and size). The aim of this project is to develop methods for fish classification and size estimation using data from broadband echosounder and further implement them into a software for near-real time viewing. Such a software would help skippers to take better informed decisions while fishing. This project is running over three years (June 2016 to June 2019) in collaboration between Wageningen Marine Research (WMR), Redersvereniging voor de Zeevisserij (RVZ) and TNO. This document reports on the improvement of the methods used for fish species classification
    Characterization of four Paenibacillus species isolated from pasteurized, chilled ready-to-eat meals
    Helmond, M.T.J. ; Nierop Groot, M.N. ; Bokhorst-van de Veen, H. van - \ 2017
    Catch sampling of the pelagic freezer trawler fishery operating in European waters in 2015-2016: Joint report of the Dutch and German national sampling programmes
    Overzee, Harriet van; Ulleweit, Jens ; Helmond, Edwin van - \ 2017
    IJmuiden : Stichting Wageningen Research, Centre for Fisheries Research (CVO) (CVO report 17.021) - 55
    Practical implementation of real-time fish classification from acoustic broadband echo sounder data- RealFishEcho progress report : Year 1-June 2017
    Berges, B. ; Sakinan, S. ; Helmond, E. van - \ 2017
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research report : C082/17) - 29
    The EU has by means of new policy restricted the discarding of fish at sea, including bycatch and slipping. As a result, the fishing industry now requires improved methods to identify fish species and size before the catch process begins. With the introduction of robust broadband echosounder (i.e. downward looking sonar) on the market, active acoustic data now have the potential for improved target discrimination for both type and size (i.e. determine fish species and size). The aim of this project is to develop methods for fish classification and size estimation using data from broadband echosounder and further implement them into a software for near-real time viewing. Such a software would help skippers to take better informed decisions while fishing. This project is running over three years (June 2016 to June 2019) in collaboration between Wageningen Marine Research (WMR), Redersvereniging voor de Zeevisserij (RVZ) and TNO. This document reports on the improvement of the methods used for fish species classification
    Pelagic blue whiting trawl innovation: hake grid
    Rijn, J. van; Helmond, A.T.M. van; Molenaar, P. - \ 2017
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research report C080/17) - 19
    Check title to add to marked list
    << previous | next >>

    Show 20 50 100 records per page

     
    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.