Staff Publications

Staff Publications

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    '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.

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Wettelijke Onderzoek Taken WOT-05 Visserijonderzoek beknopte jaarrapportage 2016
Verver, S.W. - \ 2017
IJmuiden : Wageningen UR, Stichting DLO, Centrum voor Visserijonderzoek (CVO) (CVO rapport 17.003) - 38
visserij - visserijbeheer - wetgeving - jaarverslagen - nederland - fisheries - fishery management - legislation - annual reports - netherlands
Wettelijke Onderzoek Taken WOT-05 Visserijonderzoek Jaarverslag 2016
Verver, S.W. - \ 2017
IJmuiden : Stichting Wageningen Research, Centrum voor Visserijonderzoek (CVO) (CVO rapport 17.002) - 98
visserij - visserijbeheer - wetgeving - jaarverslagen - nederland - fisheries - fishery management - legislation - annual reports - netherlands
The programme WOT-05 Fishery Research is carrying out statutory research tasks related to the management of the fishery and aquaculture in the Netherlands. The programme is developed in consultation with the Ministry of Economic Affairs (EZ). The content and scope of programme has been agreed for the period 2011-2015. In September 2015 it was decided to extend the programme till 31 December 2016. This report is a technical report and summarises the progress made in carrying out the work plan of 2016. Fisheries policy makers and managers are dependent on up-todate information. The aim of this programme is to contribute to the collection of essential data needed for the management of fisheries, fish stocks and aquaculture through sampling programmes in as well marine and inshore areas. The data collection includes sampling programmes on fish species landed in fishing ports, discard and by-catch monitoring programmes on board of commercial vessels and scientific surveys using research vessels. In addition, monitoring programmes on shellfish (bivalves) are carried out in coastal waters to estimate the biomass of these resources. In national fresh waters also the eel stock and the stocks in IJsselmeer and Markermeer are monitored. The data have been used to provide advice which is also part of this programme. The advice for marine stocks and fisheries is based on analyses of international data carried out by working groups. The main frameworks in which this was done were ICES and STECF. These frameworks also play a role in the international co-ordination of the research carried out in this programme. The programme is carried out by the Centre for Fisheries Research (CVO) and the Institute for Marine Resources and Ecosystem Studies (IMARES, since September 2016 Wageningen Marine Research) in IJmuiden. The programme is financed by the Ministry of Economic Affairs and coordinated by Sieto Verver (CVO) CVO rapport 17.002 Jaarverslag WOT visserij 2016 23 of 98 The programme has been executed according to a pre-agreed work plan. It consists of eleven projects, each managed by a project manager. Each project consists of several sub-projects. This document contains two main sections: 1) a report presenting standard information requested by the Ministry discussing the progress made with the research targets set in the pre-agreed working programme and 2) an annex including technical progress reports of the individual projects. Scientific results are not discussed but references are given to the (scientific) products. Also a short version of this progress report is available All the pre-agreed targets in the work plan have been met within the available financial budget. The report format includes a financial summary over 2016. The total cost of the programme in 2016 was 6.6 million Euro. About 0.69 m€ of the 2016 budget was forwarded to 2017 part as a reservation of activities which are planned in 2017.
Overview of the international fishing activities on the Dogger Bank : update with Dutch, British, Danish, German, Belgian, Swedish and French data for 2010-2015
Hamon, Katell G. ; Hintzen, Niels T. ; Oostenbrugge, Hans J.A.E. - \ 2017
Wageningen : Wageningen Economic Research (Wageningen Economic Research memorandum 2017-050) - 35
fisheries - marine animals - fishery management - north sea - population dynamics - europe - cost benefit analysis - visserij - zeedieren - visserijbeheer - noordzee - populatiedynamica - europa - kosten-batenanalyse
This report is an update of the data and analysis on the value of the fishing activities of the Dutch, British, Danish, German, Belgian, Swedish and French fishing fleets on the proposed closed areas on the Dogger Bank. The effort, value and landings are presented for a five-year period (2010-2015) and show large variations over the last years, driven mainly by fishing opportunities for plaice for the Dutch and British fleets and sandeel for the Danish and German fleets.
The KB WOT Fisheries Programme carried out in 2015
Damme, C.J.G. van; Verver, S.W. - \ 2017
IJmuiden : Stichting Wageningen Research, Centre for Fisheries Research (CVO) (CVO report / Centre for Fisheries Research 16.007) - 57
visserijbeheer - zeevisserij - visserijbeleid - visbestand - schaal- en schelpdierenvisserij - discards - onderwaterakoestiek - visstand - vismethoden - fishery management - marine fisheries - fishery policy - fishery resources - shellfish fisheries - underwater acoustics - fish stocks - fishing methods
The KB WOT Fisheries programme is established to maintain and develop the expertise needed to carry out the statutory obligations of the Netherlands in fisheries monitoring and advice. It is also a flexible program which responds to changes over time in WOT requirements, fisheries management and policy needs. While maintaining the core expertise and flexibility, the KB WOT programme also strives to be innovative and participate in the development of fisheries science. The programme operates within the context of the Common Fisheries Policy (CFP), the EU Marine Strategy Framework Directive (MSFD) and the EU Maritime Policy. The KB WOT fisheries programme is established annually and positioned around a number of themes. In 2015 14 projects were originally awarded. However, one project could not meet all the original objectives and with the remaining budget a 15th project was started on the tool development for fish ageing and maturity staging. These 15 projects were successfully completed. The programme focused on the research into the impact of fisheries on the seafloor, development of tools for electronic monitoring, data storage and dissemination and method development for assessment of marine resources. As always the core element of the KB WOT Fisheries was maintaining and developing key expertise for the WOT programme. A large part of the budget was therefore used for projects that standardise fish ageing, provide quality control of discard, ichthyoplankton and shellfish monitoring and development of fisheries acoustics techniques and expertise. These topics are vital for the quality of fish stock assessments and management. Of the 15 projects funded in 2015, seven were carried out in collaboration with institutes outside the Netherlands. As resources and expertise from these other countries contribute to the KB WOT Fisheries programme, these collaborations provided a large amount of added value to the programme. Another large part of the KB WOT resources is specifically dedicated to international collaboration and exchange of science. This ensures that Wageningen Marine Research researchers remain at the centre of scientific developments and international fisheries research. The programme was also very productive in terms of publications, presentations and developing new methods or tools for fisheries research. Over 15 international presentations were given at meetings, workshops and symposia, and 22 international and national reports written. 8 new methods or models were developed, 3 peer reviewed publications published and 5 scientific publications prepared.
KB WOT Fisheries 2017 : maintaining excellence and innovation in fisheries research
Damme, C.J.G. van; Verver, S.W. - \ 2017
IJmuiden : Stichting Wageningen Research, Centre for Fisheries Research (CVO) (CVO report / Centre for Fisheries Research 17.006) - 89
remote sensing - schaal- en schelpdierenvisserij - visserijbeheer - landmeetapparatuur - discards - visvangsten - zeevisserij - shellfish fisheries - fishery management - surveying instruments - fish catches - marine fisheries
The KB WOT Fisheries programme is developed to maintain and advance the expertise needed to carry out the statutory obligations in fisheries monitoring and advice of The Netherlands. The contents of the KB WOT Fisheries programme for 2017 reflects the scientific and management needs of the WOT fisheries programme. The strength of KB WOT Fisheries lies in the top-down development of the programme while allowing bottom-up input, with calls for proposals, to secure innovation. To avoid missing research priorities relevant to WOT and EZ needs, the programme is built from a closed call for proposals to WOT Fisheries project leaders. To keep the innovation WOT project leaders are requested to seek input from other Wageningen Marine Research scientists. The KB WOT Fisheries programme will fund 13 projects in 2017 which will focus on remote sensing of fish and shell fish in the ecosystem, new methods and tools for surveys, discard and catch sampling and investigating the effects of fisheries. International exchange of new expertise and developments, as well as continuous quality assurance, forms a major part of the programme.
The KB WOT Fisheries Programme carried out in 2016
Damme, C.J.G. van; Verver, S.W. - \ 2017
IJmuiden : Stichting Wageningen Research, Centre for Fisheries Research (CVO) (CVO report / Centre for Fisheries Research 17.007) - 63
visserijbeheer - visbestand - visserijbeleid - zeevisserij - schaal- en schelpdierenvisserij - monitoring - onderwaterakoestiek - vis - fishery management - fishery resources - fishery policy - marine fisheries - shellfish fisheries - underwater acoustics - fish
Maintaining and developing the expertises needed to execute the Dutch fisheries monitoring and advice statutory obligations is the core of the KB WOT Fisheries programme. As fisheries management and policy needs, and thus the WOT requirements, change over time, the KB WOT programme needs to be flexible to respond to these changes. The KB WOT programme seeks to be inventive and participate in the fisheries science development, while maintaining the core expertises and flexibility. The programme operates within the context of the Common Fisheries Policy (CFP), the EU Marine Strategy Framework Directive (MSFD) and the EU Maritime Policy. The KB WOT fisheries programme is established annually and positioned around a number of themes. In 2016 17 projects were originally awarded. However, one project could not meet all the original objectives and with the remaining budget a new project was started on the tool development for monitoring catches on board commercial vessels. The 18 projects within the programme were successfully completed. The focus of the programme in 2016 was on research into mapping the seafloor, development of tools and framework for monitoring catches on board commercial vessels, data storage and accessibility and method development for assessment of marine resources. As the basis of the KB WOT Fisheries is maintaining and developing key expertise for the WOT programme, a considerable part of the funds was used for projects that standardise fish ageing, fish and shellfish monitoring and development of fisheries acoustics techniques and expertise. These subjects are essential for ensuring the high quality of fish stock assessments and management. Of the 18 projects funded in 2016, six were carried out in international collaboration with other institutes in- and outside Europe. These partnerships provide a large amount of added value, since resources and expertise from these other countries contribute to the outcomes of the KB WOT Fisheries programme. Also, a large part of the KB WOT resources is specifically dedicated to international collaboration and exchange of science. This ensures that Wageningen Marine Research researchers remain at the centre of scientific developments and international fisheries research. The programme was also very productive in terms of publications, presentations and developing new methods or tools for fisheries research. Over 20 international presentations were given at meetings, workshops and symposia, and 24 international and national reports were written. 9 new methods or models were developed, 4 peer reviewed publications published and 1 scientific publication prepared
Draagkracht voor schelpdieren : definities, indices en case studie
Smaal, Aad - \ 2017
Yerseke : Wageningen Marine Research (Wageningen Marine Research rapport C023/17) - 26
schaaldieren - ecosystemen - draagkracht - gevalsanalyse - visserijbeheer - natuurbeheer - oosterschelde - shellfish - ecosystems - carrying capacity - case studies - fishery management - nature management - eastern scheldt
Knowledge production at boundaries : an inquiry into collaborations to make management plans for European fisheries
Stange, Kari - \ 2017
University. Promotor(en): Jan van Tatenhove, co-promotor(en): Judith van Leeuwen. - Wageningen : Wageningen University - ISBN 9789463430623 - 160
fishery management - european union - stakeholders - european union countries - fishery policy - multi-stakeholder processes - knowledge - knowledge transfer - environmental policy - fisheries - companies - europe - visserijbeheer - europese unie - landen van de europese unie - visserijbeleid - multi-stakeholder processen - kennis - kennisoverdracht - milieubeleid - visserij - kapitaalvennootschappen - europa

This thesis addresses how knowledge is used and produced in stakeholder-led collaborations to make long-term management plans for European fishery management. Boundary object theory is applied and developed to explain how stakeholders from the fishing industry interact with each other, and with fishery scientists and managers, in initiatives to produce management plans. Using a qualitative case study approach, two initiatives were investigated in-depth: the North Sea Advisory Council’s development of a long-term management plan for North Sea Nephrops fisheries, and the Pelagic Advisory Council’s development of a long-term management plan for a new boarfish fishery in the Northeast Atlantic. A conceptual framework with emphasis on boundary spaces was developed to analyse knowledge exchange and the interaction between actors, objects and activities. The findings point to the importance of entry points for actors to become directly involved in knowledge-production processes. Direct stakeholder engagement in management plan production created a sense of ownership of the problems identified and triggered solution-oriented ways of working. The findings highlight the multiple roles played by fishery scientists in the diverse settings where management plans for European fisheries are produced, and draw attention to the need for clear procedures to ensure that different roles are acted out transparently.

Fleet dynamics in a changing policy environment
Batsleer, J. - \ 2016
University. Promotor(en): Adriaan Rijnsdorp, co-promotor(en): Jan Jaap Poos. - Wageningen : Wageningen University - ISBN 9789462579521 - 171
fleet dynamics - fisheries - fishery policy - fishery management - sustainability - pleuronectiformes - vlootdynamica - visserij - visserijbeleid - visserijbeheer - duurzaamheid (sustainability)

The European Common Fisheries Policy has received much criticism. In the first place for failing to implement effective management measures aimed at rebuilding and maintaining fish stocks at a sustainable level. In addition, it is said current fisheries policy fails to integrate the wider ecosystem effects of fishing into policy making, such as reducing pressure on non-target species and habitats. Especially discarding (i.e. throwing back unwanted catches at sea) in commercial fisheries has received an increased amount of negative attention. Public campaigns stressed discarding is a wasteful and disruptive practice as natural resources are extracted from the ecosystem only to be thrown back to sea dead. In response, the European Commission agreed to enforce a discard ban for European fisheries, obliging all European fishing vessels to retain and land their entire catch, including small sized individuals, of all species subject to quota management.

This thesis explores how management measures can mitigate the adverse effects of fishing to support the development of an ecosystem-based approach to fisheries management. I evaluate how fleet dynamics, i.e. the decision of individual skippers on when and where to fish, while competing for similar resources, may influence the performance of management measures. In particular the thesis focusses on how location choice and discard decisions made by individual fishers in a mixed fishery are influenced by management, resource distribution and technological innovations. Using a generic dynamic state variable model (DSVM), specific applications are built to address the behavioural dynamics for the Dutch North Sea flatfish fisheries and the French mixed demersal fisheries in the Channel in response to new management regulations and economic opportunities.

The first research chapter of this thesis (Chapter 2) explores how a combination of quota management with a discard ban may improve the regulation of fishing mortality for a depleted stock that is exploited in a mixed fishery. Our finding show that under a discard ban, when properly enforced, individual fishers reallocate fishing effort away from areas and weeks with high catch rates of the quota constrained species, reducing over-quota discarding and thus contributes to the conservation of vulnerable species. However, discard reduction measures which coincide with a reduction in the economic performance of the fishery may jeopardise compliance as fishers may trade-off economic gains of non-compliance against the costs.

Fishers will discard marketable fish when quota are exhausted (over-quota discarding) or by trying to optimize their economic return by discarding size or age classes with the lowest economic value (high-grading). In chapter 3 observations of over-quota discarding and high-grading are reviewed to gain insight in the conditions under which discard decisions may occur. The review suggest that high-grading occurs under different management systems for a large variety of fisheries worldwide. In addition, outcomes of the simulation model illustrate fishers have the ability to strategically plan their fishing activities to optimize the composition of their catch taking account of the availability of quota and seasonal price variations. As a result, the size composition of the high-graded catch differs from the landed catch. Difficulties in accounting for this difference may undermine the accuracy of the stock assessments and quality of scientific advice.

Chapter 4 addresses the question how a ban on discarding may promote the transition towards more selective fishing gears. Model results suggest that under a discard ban, fishing activities are restricted and reallocated away from areas and weeks of high catches of small fish constrained by quota. Activities are allocated to areas and weeks where a maximum revenue can be realised landing other species and economically more valuable length classes of the quota restricted species. When using more selective fishing gear, fishing activities will be less restricted. Fewer small fish are landed which would otherwise be counted against the quota, fetching a low price and reduce the economic value of the landings. Hence, there is an economic advantage and fishers can continue fishing for a longer period of time, including areas where a higher density of small fish as well as more economically valuable fish co-occur. As such, if properly enforced, a discard ban can incentivise the use of more selective gear to reduce the catch of undersized fish.

Trawl fisheries targeting demersal fish and shellfish cause mortality on target and non-target species, but impact benthic ecosystems. Fisheries managers mainly resort to technical management measures, such as gear restrictions or spatial measures to mitigate these impacts. Chapter 5 explores the potential of a habitat credit system as an alternative management approach to achieve sustainable exploitation of target species while minimizing the impact on the benthic ecosystem. Results show that a habitat credit system has the potential to reduce the benthic impact and maintain profitable fisheries as vessels can adjust their behaviour by reallocating fishing activities to make optimal use of the available credits.

Fishers can adapt and change their behaviour in relation to imposed constraints, which can lead to unintended and unexpected consequences of fisheries management. To date, the effect of behavioural adaptations of individual fishers on the success of fisheries management is often overlooked by policymakers. The models developed in this thesis provide a strong basis to explore possible unexpected effects of management measures resulting from the adaptive behaviour of fishers to these measures. Outcomes of this thesis draw attention to the importance of making fleet dynamics an integral part of fisheries management and the need to develop innovative analytical methodologies which deliver sufficiently robust insights into complex socioeconomic and ecosystem issues to improve the basis of decision making.

Indicatieve impact maatregelen zeebaars : eerste indicatie van de mogelijke impact van zeebaarsbeschermende maatregelen op de Nederlandse zeevisserij
Strietman, W.J. ; Weegh, J.B.M. op de - \ 2016
Wageningen : LEI Wageningen UR (Nota / LEI Wageningen UR 2016-007) - 23 p.
zeebaars - zeevisserij - visserijbeheer - visbestand - bescherming - quota's - milieueffect - nederland - sea bass - marine fisheries - fishery management - fishery resources - protection - quotas - environmental impact - netherlands
Zeebaars paaigebieden en opgroeigebieden in Nederlandse wateren
Tulp, I.Y.M. ; Hal, R. van; Damme, C.J.G. van; Smith, S.R. - \ 2016
IMARES (Rapport / IMARES C060/16) - 35 p.
visserijbeheer - zeevisserij - visserijbeleid - visbestand - habitatbeheer - nederland - het kanaal (english channel) - kuitschieten - waddenzee - zeeuwse eilanden - boomkorvisserij - zeebaars - noordzee - rijpen - fishery management - marine fisheries - fishery policy - fishery resources - habitat management - netherlands - english channel - spawning - wadden sea - beam trawling - sea bass - north sea - maturation
De zeebaarspopulatie neemt sinds 2010 sterk af door een hoge visserij-inspanning en een lage aanwas van jonge zeebaars sinds 2008. Zeebaars is een langlevende soort die zich pas op latere leeftijd gaat voortplanten. Op een leeftijd van ca 4 jaar en met een lengte vanaf ca 42 cm (vrouwtjes) en 32 cm (mannetjes) beginnen ze paairijp te worden. De huidige minimum aanlandingsmaat van 42 cm heeft als gevolg dat veel vrouwtjes al gevangen worden voordat ze voor het eerst hebben kunnen paaien. Naast vangstbeperkende maatregelen wordt gezocht naar maatregelen ter bescherming van paai- en opgroeigebieden. Hiervoor is ecologische kennis nodig, die voor de Nederlandse wateren nog grotendeels ontbreekt. Aanwezigheid van paaiende volwassen zeebaarzen is direct bewijs voor een paaigebied. Het alternatief is om aan paaigebieden vast te stellen aan de hand van de verspreiding van eieren in een vroeg ontwikkelstadium. Een relatief groot aantal larven en juveniele zeebaars kan wijzen op het belang van een gebied als opgroeigebied. Aanbevelingen voor beleid Gezien de huidige staat van onze kennis, kunnen we nu geen steekhoudende aanbevelingen voor maatregelen gericht op bescherming van gebieden of habitats te geven. De evidentie voor paaigebieden is nog erg dun, de opgroeigebieden zijn wel redelijk bekend, maar over het relatieve belang van elk gebied voor de populatie is nog geen inzicht. Het is duidelijk dat overbevissing een probleem is gezien de ontwikkelingen in de aanlandingen en de afname in gemiddelde lengte bij aanlanding. Het is ook duidelijk dat de zeebaars die in Nederland gevangen wordt in ieder geval voor een groot deel afkomstig is uit het Kanaal en dat de visserij daar in het vroege voorjaar van grote invloed is op de hoeveelheid zeebaars, die later in het jaar in onze wateren terechtkomt. Op basis van de huidige gegevens en inzichten is een verdere inperking van de vangsten door zowel commerciële als recreatieve vissers in ieder geval een effectieve maatregel om de zeebaarsstand te vergroten. Of er in aanvulling daarop ook noodzaak is om gericht gebieden of habitats te beschermen of te verbeteren is met de huidige kennis en gegevens niet vast te stellen en kan alleen met aanvullend onderzoek worden vastgesteld.
Estimating a conversion factor for the gears used in the industry survey
Hal, R. van; Reijden, K.J. van der - \ 2016
IJmuiden : IMARES (Report / IMARES C004/16) - 35 p.
dover soles - plaice - fishing vessels - fishing gear - conversion - surveys - fish stocks - fishery management - fishery resources - north sea - tong (vis) - schol - vissersschepen - vistuig - conversie - karteringen - visstand - visserijbeheer - visbestand - noordzee
Overleving van discard platvis: vaststellen en verhogen
Marlen, B. van; Molenaar, P. ; Reijden, K.J. van der; Goudswaard, P.C. ; Bol, R.A. ; Glorius, S.T. ; Theunynck, R. ; Uhlmann, S.S. - \ 2016
IMARES (Rapport / IMARES C180/15) - 116 p.
pleuronectiformes - overleving - discards - zeevisserij - visserijbeheer - nederland - survival - marine fisheries - fishery management - netherlands
On the possibility of RTCs in the Dutch demersal fishery
Verkempynck, R. ; Machiels, M.A.M. - \ 2016
IMARES (Report / IMARES C012/16) - 32 p.
marine fisheries - discards - monitoring - fishery management - netherlands - zeevisserij - visserijbeheer - nederland
VISNED has asked IMARES to do conduct a short feasibility study on the possibility of Real time closures (RTCs) as a tool for the Dutch demersal fishery to cope with the landing obligation (EU regulation 1380/2013). This assignment is part of the EVF-project “Innovatieve discardvermindering in de praktijk” (Innovative discard reduction in practice). In this report we present a short overview of examples of (real time)-closures in Europe. Additionally, known advantages and disadvantages are listed. Next we present discard maps that are based on data from the yearly Dutch discard monitoring and ongoing VIP projects collecting discards. Two sources of data are currently available. We discuss the suitability of these maps and the information they deliver as a driver for a possible RTC system.
Verslag bedrijfssurvey 2015
Reijden, K.J. van der; Rink, G.J. ; Dammers, M. ; Wiegerinck, J.A.M. ; Hal, R. van - \ 2015
IJmuiden : IMARES (Rapport / IMARES C177/15) - 22 p.
visserijbeheer - visvangsten - visbestand - noordzee - fishery management - fish catches - fishery resources - north sea
Dit rapport beschrijft de vangstresultaten van het vijfde jaar van de bedrijfssurvey. Deze survey is gericht op schol en tong en opgezet om extra informatie aan te leveren voor de bestandsschattingen van deze soorten. Elk jaar wordt op vaste locaties op dezelfde schepen (UK45 en OD1) volgens een vast protocol de gehele vangst van het stuurboord net uitgezocht op alle schol en tong. De lengtes van de vissen worden gemeten en van een aantal van de vissen worden ook de gehoorsteentjes verzameld voor leeftijdsdeterminatie. Met behulp van de daaruit volgende lengte-leeftijd-sleutel worden de leeftijden geschat van alle gevangen schollen en tongen. Vervolgens kan per jaar een vangstreeks worden berekend per leeftijdsklasse, welke in een bestandsschatting zouden kunnen worden gebruikt.
Decentraal aalbeheer in Friesland : een economische analyse
Prins, H. ; Zaalmink, W. - \ 2015
LEI Wageningen UR (Report / LEI Wageningen UR 2015-157) - 81 p.
binnenvisserij - palingen - european eels - anguilla - visserij - visvangsten - quota - visserijbeheer - economische ontwikkeling - friesland - nederland - binnenwateren - freshwater fisheries - eels - fisheries - fish catches - quotas - fishery management - economic development - netherlands - inland waters
Within the framework of the eel recovery plan, restrictive measures have been in force in Dutch eel fisheries since 2009. Since 2011, Frisian inland fishers, associated through the Frisian association of inland fishers (Friese Bond van Binnenvissers), have been experimenting with fishing quotas for eel. This approach is also known as 'decentralised eel management' (decentraal aalbeheer). This quota is in lieu of the statutory eel fisheries system, which includes a three-month period in which no eel may be fished. This report will explore the economic development of Frisian inland fisheries since 2007, as well as the question whether fishing quotas are economically viable.
Kennisinventarisatie paaigebieden en kinderkamers Europese zeebaars (Dicentrarchus labrax)
Smith, S.R. ; Steenbergen, J. ; Jongbloed, R.H. - \ 2015
IMARES (Rapport / IMARES C161/15) - 35 p.
zeebaars - kuitschieten - vismigratie - inventarisaties - visstand - visbestand - visserijbeheer - europese unie - oosterschelde - sea bass - spawning - fish migration - inventories - fish stocks - fishery resources - fishery management - european union - eastern scheldt
VIP report "Use of new broadband echosounder" : Techniques for improved ocean imaging and selectivity in pelagic fisheries
Fassler, S.M.M. ; Scoulding, B.C. ; Burggraaf, D. ; Haan, D. de; Quesson, Benoit ; Sande, Jeroen van de; Beerens, Peter - \ 2015
IMARES (Report / IMARES C171/15) - 100 p.
pelagic fishery - marine fisheries - underwater acoustics - fish stocks - bycatch - fishery resources - fishery management - pelagische visserij - zeevisserij - onderwaterakoestiek - visstand - bijvangst - visbestand - visserijbeheer
Langetermijn opties voor het visserij-advies over schubvis op het IJsselmeer en Markermeer
Tien, N.S.H. ; Hammen, T. van der - \ 2015
IJmuiden : IMARES (Rapport / IMARES C163/15) - 22 p.
visserij - visserijbeleid - vissen - visserijbeheer - ijsselmeer - nederland - fisheries - fishery policy - fishes - fishery management - lake ijssel - netherlands
IMARES geeft visserij-advies (vangst-/inspanningsadvies) voor de schubvisbestanden snoekbaars, baars, blankvoorn en brasem op het IJsselmeer en Markermeer. Gezien de lage kwantiteit en kwaliteit van gegevens over de visbestanden en met name de visserij erop, wordt momenteel het advies gebaseerd op een methodiek binnen het ICES-raamwerk, welke is ontwikkeld voor data-gelimiteerde bestanden (‘DLS’). Het ministerie van Economische Zaken (EZ) wil toewerken naar nauwkeuriger advies en wil de relatie tussen beheer en bestandsontwikkelingen kunnen kwantificeren (Kaderbrief 2015). Dit rapport bevat een overzicht van de mogelijkheden en beperkingen voor verbeteringen in de adviezen. Het tijdsgewricht voor deze ontwikkelingen is met name 2017-2019 maar met een doorkijk naar de jaren erna. Dit rapport beschrijft drie aspecten van het advies voor de schubvisbestanden: (1) langetermijn verbeteringen in de toegepaste modellen, (2) beschrijving van hoe de referentieperiode te kiezen in de komende jaren, en (3) beschrijving van mogelijke problemen rond toestaan van verhuur en verkoop van visserijrechten tussen vergunninghouders in de komende jaren.
Fisheries displacement effects related to closed areas : a literature review of relevant aspects
Slijkerman, D.M.E. ; Tamis, J.E. - \ 2015
Den Helder : IMARES (Report / IMARES C170/15) - 51 p.
marine fisheries - fishing grounds - displacement - environmental protection - socioeconomics - fishery management - north sea - netherlands - zeevisserij - visgronden - verplaatsing - milieubescherming - sociale economie - visserijbeheer - noordzee - nederland
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