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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Seascape genetics of a flatfish reveals local selection under high levels of gene flow
Diopere, Eveline ; Vandamme, Sara G. ; Habluetzel, Pascal I. ; Cariani, Alessia ; Houdt, Jeroen van; Rijnsdorp, A.D. ; Tinti, Fausto ; Volckaert, Filip A.M. ; Maes, Gregory E. - \ 2018
ICES Journal of Marine Science 75 (2018)2. - ISSN 1054-3139 - p. 675 - 689.
fish - isolation by distance - local adaptation - Northeast Atlantic Ocean - outlier locus - population genomics - SNP - sole
Local adaptation is often found to be in a delicate balance with gene flow in marine species with high dispersal potential. Genotyping with mapped transcriptome-derived markers and advanced seascape statistical analyses are proven tools to uncover the genomic basis of biologically relevant traits under environmental selection. Using a panel of 426 gene-linked single nucleotide polymorphisms (SNPs), we scanned 17 samples (n¼539) of sole (Solea solea L.) from the Northeast Atlantic Ocean and applied a node-based seascape analysis. Neutral loci confirmed a clear distinction between the North Sea–Baltic Sea transition zone and the other Eastern Atlantic samples. At a more subtle level,
the latter unit split in an English Channel and North Sea group, and a Bay of Biscay and Atlantic Iberian coast group. A fourth group, the Irish and Celtic Sea, was identified with 19 outlier loci. A pattern of isolation by distance (IBD) characterized the latitudinal distribution. Seascape analyses identified winter seawater temperature, food availability and coastal currents to explain a significant component of geographically distributed genetic variation, suggesting that these factors act as drivers of local adaptation. The evidence for local adaptation is in line with the current understanding on the impact of two key ecological factors, the life-history trait winter mortality and the behaviour of inshore/offshore spawning. We conclude that the subtle differentiation between two metapopulations (North Sea and Bay of Biscay) mirrors local adaptation.
At least three genomic regions with strong population differentiation point to locally divergent selection. Further functional characterization of these genomic regions should help with formulating adaptive management policies.
Physiology-based modelling approaches to characterize fish habitat suitability : their usefulness and limitations
Teal, L.R. ; Marras, Stefano ; Peck, M.A. ; Domenici, Paolo - \ 2018
Estuarine Coastal and Shelf Science 201 (2018). - ISSN 0272-7714 - p. 56 - 63.
physiology-based models - dynamic energy budget - aerobic scope - species distribution - fish - conservation biology
Models are useful tools for predicting the impact of global change on species distribution and abundance. As ectotherms, fish are being challenged to adapt or track changes in their environment, either in time through a phenological shift or in space by a biogeographic shift. Past modelling efforts have largely been based on correlative Species Distribution Models, which use known occurrences of species across landscapes of interest to define sets of conditions under which species are likely to maintain populations. The practical advantages of this correlative approach are its simplicity and the flexibility in terms of data
requirements. However, effective conservation management requires models that make projections beyond the range of available data. One way to deal with such an extrapolation is to use a mechanistic approach based on physiological processes underlying climate change effects on organisms. Here we illustrate two approaches for developing physiology-based models to characterize fish habitat suitability. (i) Aerobic Scope Models (ASM) are based on the relationship between environmental factors and aerobic scope (defined as the difference between maximum and standard (basal) metabolism). This approach is based on experimental data collected by using a number of treatments that allow a function to be derived to predict aerobic metabolic scope from the stressor/environmental factor(s). This function is then integrated with environmental (oceanographic) data of current and future scenarios. For any given species, this approach allows habitat suitability maps to be generated at various spatiotemporal scales. The strength of the ASM approach relies on the estimate of relative performance when comparing, for example, different locations or different species. (ii) Dynamic Energy Budget (DEB) models are based on first principles including the idea that metabolism is organised in the same way within all animals. The (standard) DEB model aims to describe empirical relationships which can be found consistently within physiological data across the animal kingdom. The advantages of the DEB models are that they make use
of the generalities found in terms of animal physiology and can therefore be applied to species for which little data or empirical observations are available. In addition, the limitations as well as useful potential refinements of these and other physiology-based modelling approaches are discussed. Inclusion of the
physiological response of various life stages and modelling the patterns of extreme events observed in nature are suggested for future work
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
Toxicity of organophosphorus pesticide sumithion on larval stages of stinging catfish Heteropneustes fossilis
Shahjahan, M. ; Kabir, M.F. ; Sumon, Kizar Ahmed ; Bhowmik, Lipi Rani ; Rashid, Harunur - \ 2017
Chinese Journal of Oceanology and Limnology 35 (2017)1. - ISSN 0254-4059 - p. 109 - 114.
environment - fish - organophosphorus pesticide - toxicity

Sumithion is widely used to control brittle in paddy fields and tiger bug in fish larval rearing ponds. The objective of this study was to elucidate the toxic effects of sumithion on larval stages of stinging catfish Heteropneustes fossilis. Larvae were exposed to two concentrations (150 and 250 μg/L) of sumithion with one control in three replicates of each. Larvae samples were collected at 20- and 24-h intervals followed by observation under a digital microscope. Exposures of stinging catfish larvae to sumithion produced deformities including irregular head shape, lordosis, yolk sac edema, body arcuation, tissue ulceration, etc. The mortality rates of larvae were significantly increased in response to increase in sumithion concentrations. Furthermore, around 30% of the total adult stinging catfish reared in sumithiontreated aquaculture ponds were found to be deformed permanently. These findings highlight that exposure of stinging catfish to sumithion at the critical and sensitive stages in their life cycle may significantly reduce the number of returning adults. Therefore, the use of sumithion for crop protection needs to be considered carefully and alternatives to sumithion should to be developed for controlling aquatic insects in aqua-ponds during larval rearing.

Verslag evaluatiebijeenkomst "Onbedoelde Bijvangst in Beeld"
Strietman, W.J. ; Siemensma, M. - \ 2016
Wageningen Economic Research - 12 p.
dierenwelzijn - wilde dieren - diergezondheid - vis - animal welfare - wild animals - animal health - fish
Contrasting the roles of section length and instream habitat enhancement for river restoration success: a field study on 20 European restoration projects
Hering, D. ; Aroviita, J. ; Baattrup-Pedersen, A. ; Brabec, K. ; Buijse, T. ; Ecke, F. ; Friberg, N. ; Gielczewski, Marek ; Januschke, K. ; Köhler, J. ; Kupilas, Benjamin ; Lorenz, A.W. ; Muhar, S. ; Paillex, Amael ; Poppe, Michaela ; Schmidt, T. ; Schmutz, S. ; Vermaat, J. ; Verdonschot, R.C.M. ; Verdonschot, P.F.M. ; Wolter, Christian ; Kail, J. - \ 2015
aquatic macrophytes - benthic invertebrates - fish - floodplain - flow patterns - food web - ground beetles - riparian vegetation - stable isotopes
1. Restoration of river hydromorphology often has limited detected effects on river biota. One frequently discussed reason is that the restored river length is insufficient to allow populations to develop and give the room for geomorphologic processes to occur. 2. We investigated ten pairs of restored river sections of which one was a large project involving a long, intensively restored river section and one represented a smaller restoration effort. The restoration effect was quantified by comparing each restored river section to an upstream non-restored section. We sampled the following response variables: habitat composition in the river and its floodplain, three aquatic organism groups (aquatic macrophytes, benthic invertebrates and fish), two floodplain-inhabiting organism groups (floodplain vegetation, ground beetles), as well as food web composition and land–water interactions reflected by stable isotopes. 3. For each response variable, we compared the difference in dissimilarity of the restored and nearby non-restored section between the larger and the smaller restoration projects. In a second step, we regrouped the pairs and compared restored sections with large changes in substrate composition to those with small changes. 4. When comparing all restored to all non-restored sections, ground beetles were most strongly responding to restoration, followed by fish, floodplain vegetation, benthic invertebrates and aquatic macrophytes. Aquatic habitats and stable isotope signatures responded less strongly. 5. When grouping the restored sections by project size, there was no difference in the response to restoration between the projects targeting long and short river sections with regard to any of the measured response variables except nitrogen isotopic composition. In contrast, when grouping the restored sections by substrate composition, the responses of fish, benthic invertebrates, aquatic macrophytes, floodplain vegetation and nitrogen isotopic composition were greater in sections with larger changes in substrate composition as compared to those with smaller changes. 6. Synthesis and applications. The effects of hydromorphological restoration measures on aquatic and floodplain biota strongly depend on the creation of habitat for aquatic organisms, which were limited or not present prior to restoration. These positive effects on habitats are not necessarily related to the restored river length. Therefore, we recommend a focus on habitat enhancement in river restoration projects.
Heldere herleidbaarheid in de visketen
Asselt, E.D. van; Roest, J.G. van der; Staats, M. ; Kok, E.J. ; Cuijpers, H.J.J. ; Ruth, S.M. van - \ 2015
RIKILT Wageningen UR (RIKILT-rapport 2015.013) - 39 p.
technologie - visproducten - analytische methoden - naspeurbaarheid - vis - visverwerking - diepvriesvis - schaaldieren - garnalen - kabeljauw - verse producten - technology - fish products - analytical methods - traceability - fish - fish processing - frozen fish - shellfish - shrimps - cod - fresh products
Heldere herleidbaarheid betekent dat kenmerken die bij verkoop worden toegekend aan visproducten terug te herleiden zijn in de keten. Het gaat daarbij om aspecten als de vissoort, maar ook de geografische oorsprong en de processing van de vis. Om de consument volledig inzicht te bieden in productinformatie is de etiketteringswetgeving ((EU) 1169/2011) recent aangescherpt en dienen dergelijke aspecten op het etiket vermeld te worden. In dit project is onderzocht welke administratieve en analytische methoden gebruikt kunnen worden om de voorgeschiedenis van visproducten aan te tonen. Er is gewerkt aan vier deelprojecten die door de projectpartners als prioriteit werden aangemerkt: administratieve traceerbaarheid in de kabeljauwketen, aantonen van watergehaltes in garnalen, vaststellen van geografische oorsprong van witpootgarnalen en onderscheid tussen verse en ontdooide vis. De resultaten van deze vier onderzoeken zijn in dit rapport beschreven.
Analysemethoden voor de bepaling van authenticiteit in visketens
Staats, M. ; Roest, J.G. van der; Pustjens, A.M. ; Voorthuijzen, M.M. ; Dijk, J.P. van; Prins, T.W. ; Boerrigter-Eenling, G.R. ; Koot, A.H. ; Pelt-Heerschap, H.M.L. van; Spiegel, M. van der; Ruth, S.M. van; Kok, E.J. - \ 2015
RIKILT (Rikilt-rapport 015) - 67 p.
noordzee - vis - vissen - analytische methoden - schol - north sea - fish - fishes - analytical methods - plaice
Dit rapport beschrijft de resultaten van onderzoek dat is uitgevoerd binnen het project "Analysemethoden voor de bepaling van authenticiteit in visketens". Het project heeft als doel om methoden te ontwikkelen waarmee de authenticiteit (soort, geografische herkomst en productiewijze) van Noordzeevissen kan worden vastgesteld. In dit project is gewerkt aan vier deelprojecten: Ketenanalyse naar vermenging van schol (Pleuronectes platessa) uit de Noordzee met andere vissoorten, ontwikkeling en initiële validatie van een moleculaire barcoding methode om Noordzeevissoorten in gemengde monsters te identificeren, bepaling van de geografische herkomst van schol en productiemethode van tarbot met behulp van isotoopratio's en chemische fingerprint en toepassing van de ontwikkelde analytische methoden in Noordzeevisketens. De resultaten van deze onderzoeken zijn in dit rapport weergegeven.
Uit Je Eigen Stad
Heijden, P.G.M. van der - \ 2015
Aquacultuur 2015 (2015)2. - ISSN 1382-2764 - p. 17 - 24.
groenten - vis - bedrijven - voedselproductie - stadslandbouw - aquacultuur - visteelt - viskwekerijen - groenteteelt - aquaponics - innovaties - vegetables - fish - businesses - food production - urban agriculture - aquaculture - fish culture - fish farms - vegetable growing - innovations
In 2010 vatte drie ondernemers het plan op om bij de Rotterdamse Fruithaven een loods en het erom heen gelegen rangeerterrein een landbouwkundige bestemming te geven. Het duurde tot 2012 voordat voldoende kapitaal en vergunningen waren geregeld en met de aanleg van Uit Je Eigen Stad begonnen kon worden. Inmiddels is er veel bereikt (waaronder een werkend aquaponics systeem met een inhoud van 125 m3) en worden groente, tilapia, Afrikaanse meerval, paddenstoelen en kippen in het eigen restaurant en in Rotterdam en omgeving verkocht. Maar de medewerkers van Uit Je Eigen Stad rusten niet en gaan door met het testen en proberen van verschillende gewassen, productiewijzen, producten, markten en evenementen. We bezochten het bedrijf en spraken met Ivo Haenen.
Over het welzijn van in zee gevangen vis
Jonge, F.H. de; Boon, N. ; Brauner, M. ; Dakriet, N. ; Kumar Ghosh, A. ; Jansen, J. ; Hamoen, J. ; Kok, J. de; Hürlimann, R. ; Laan, R. ; Marbus, S. ; Merema, P. ; Pijcke, N. ; Rooijen, K. van; Stolwijk, D. ; Vissia, S. ; Vrijenhoek, M. ; Willemsma, A. ; Zaalberg, R. ; Zagenia, F. - \ 2015
Wageningen : Wetenschapswinkel Wageningen UR (Rapport / Wetenschapswinkel Wageningen UR 322) - 57
dierenwelzijn - vis - wilde dieren - diergezondheid - visserij - zeevisserij - vismethoden - animal welfare - fish - wild animals - animal health - fisheries - marine fisheries - fishing methods
De Stichting Vissenbescherming heeft de hulp van de wetenschapswinkel van Wageningen UR ingeroepen. Zij vraagt haar te ondersteunen met onderzoek dat een stap voorwaarts kan betekenen op weg naar een vissenwelzijnskeurmerk voor in het wild gevangen (zee)vis. In totaal 19 studenten (3 studententeams en 2 masterstudenten) deden voor de wetenschapswinkel (literatuur)onderzoek naar a) welzijn van vissen (met name platvis) in relatie tot de visserij en b) maatschappelijke agendering op het gebied van vissenwelzijn. Op grond van een literatuurstudie wordt geconcludeerd dat steeds meer wetenschappelijke argumenten erop wijzen dat ook vissen pijn lijden en emoties kunnen ervaren. Voor diegenen die deze argumenten in twijfel trekken wordt door Elder bepleit het “voorzorgsprincipe” te hanteren, waarbij ernaar gestreefd wordt het risico op pijn en leed bij vissen zoveel mogelijk te voorkomen.
The effects of environmental enrichment and age-related differences on inhibitory avoidance in zebrafish (Danio rerio Hamilton)
Manuel, R. ; Gorissen, M. ; Stokkermans, M. ; Zethof, J. ; Ebbesson, L.O.E. ; Vis, J.W. van de; Flik, G. ; Bos, R. van den - \ 2015
Zebrafish 12 (2015)2. - ISSN 1545-8547 - p. 152 - 165.
corticotropin-releasing-factor - binding-protein - rearing environment - neurotrophic factor - emotional memory - factor crf - rat-brain - stress - fish - expression
The inhibitory avoidance paradigm allows the study of mechanisms underlying learning and memory formation in zebrafish (Danio rerio Hamilton). For zebrafish, the physiology and behavior associated with this paradigm are as yet poorly understood. We therefore assessed the effects of environmental enrichment and fish age on inhibitory avoidance learning. Fish raised in an environmentally enriched tank showed decreased anxiety-like behavior and increased exploration. Enrichment greatly reduced inhibitory avoidance in 6-month (6M)- and 12-month (12M)-old fish. Following inhibitory avoidance, telencephalic mRNA levels of proliferating cell nuclear antigen (pcna), neurogenic differentiation (neurod), cocaine- and amphetamine-regulated transcript 4 (cart4), and cannabinoid receptor 1 (cnr1) were lower in enriched-housed fish, while the ratios of mineralocorticoid receptor (nr3c2)/glucocorticoid receptor a [nr3c1(a)] and glucocorticoid receptor ß [nr3c1(ß)]/glucocorticoid receptor a [nr3c1(a)] were higher. This was observed for 6M-old fish only, not for 24-month (24M) old fish. Instead, 24M-old fish showed delayed inhibitory avoidance, no effects of enrichment, and reduced expression of neuroplasticity genes. Overall, our data show strong differences in inhibitory avoidance behavior between zebrafish of different ages and a clear reduction in avoidance behavior following housing under environmental enrichment.
Electrophysiological and behavioural responses of turbot (Scophthalmus maximus) cooled in ices water
Lambooij, E. ; Bracke, M.B.M. ; Reimert, H.G.M. ; Foss, A. ; Imsland, A. ; Vis, J.W. van de - \ 2015
Physiology and Behavior 149 (2015). - ISSN 0031-9384 - p. 23 - 28.
fish - welfare - pain - stress - system - l.
Behavioural, neural and physiological aspects related to pre-slaughter cooling of turbot habituated to two environmental temperatures (18.7 and 12.0 °C) were investigated. Six fish in both treatments were immersed in ice water for 75 min. For control, four fish were immersed in water under their habituated environmental temperature. Turbot did not show a quick reduction of overall power in the EEG (electroencephalogram) to less than 10%, nor did the turbot show a shift in brain wave predominance from high to low frequency waves. At 15 min after immersion in ice water at least 7 out of 12 fish still showed total power values over 10% of pre-immersion values. Significant reductions in responsiveness to needle scratches and reduced breathing after immersion in ice waterwere observed, but none of these parameters had dropped to 0 even after 75 min in icewater. A significant reduction in gill score was found at 2 and 5 min after immersion in ice water compared to the control fish (p
Impulsive sounds change European seabass swimming patterns: influence of pulse repetition interval
Neo, Y.Y. ; Ufkes, E. ; Kastelein, R.A. ; Winter, H.V. ; Cate, C. ten; Slabbekoorn, H. - \ 2015
Marine Pollution Bulletin 97 (2015)1-2. - ISSN 0025-326X - p. 111 - 117.
startle-response - trawling vessel - fish - habituation - behavior - noise - variability - avoidance - zebrafish - recovery
Seismic shootings and offshore pile-driving are regularly performed, emitting significant amounts of noise that may negatively affect fish behaviour. The pulse repetition interval (PRI) of these impulsive sounds may vary considerably and influence the behavioural impact and recovery. Here, we tested the effect of four PRIs (0.5–4.0 s) on European seabass swimming patterns in an outdoor basin. At the onset of the sound exposures, the fish swam faster and dived deeper in tighter shoals. PRI affected the immediate and delayed behavioural changes but not the recovery time. Our study highlights that (1) the behavioural changes of captive European seabass were consistent with previous indoor and outdoor studies; (2) PRI could influence behavioural impact differentially, which may have management implications; (3) some acoustic metrics, e.g. SELcum, may have limited predictive power to assess the strength of behavioural impacts of noise. Noise impact assessments need to consider the contribution of sound temporal structure.
Tafel van Louise Fresco : tentoonstelling Foodtopia, Boerhaave Museum
Fresco, L.O. - \ 2015
Wageningen : Wageningen UR
voedingsmiddelen - algen - aardappelen - appels - etiketteren van voedingsmiddelen - insecten als voedsel - overgewicht - robots - brood - dierenwelzijn - vis - voedselproductie - foods - algae - potatoes - apples - nutrition labeling - insects as food - overweight - bread - animal welfare - fish - food production
Hoe ziet ons eten er in de toekomst uit? En waar halen we het vandaan? Louise O. Fresco, voorzitter van de Raad van Bestuur van Wageningen UR, is gastconservator van de tentoonstelling FOODTOPIA in museum Boerhaave. Deze filmpjes zijn onderdeel van de tentoonstelling en geeft een kijkje in de toekomst van ons voedsel. Onderwerpen zijn: algen, aardappel, de appel, etiketten, insecten, overgewicht, respect, robots, brood, dierenwelzijn en vis.
A method to assess social sustainability of capture fisheries: An application to a Norwegian trawler
Veldhuizen, L.J.L. ; Berentsen, P.B.M. ; Bokkers, E.A.M. ; Boer, I.J.M. de - \ 2015
Environmental Impact Assessment Review 53 (2015). - ISSN 0195-9255 - p. 31 - 39.
time-temperature integrators - different quality parameters - production systems - egg-production - swot analysis - indicators - fish - farm - appraisal - rapfish
Social sustainability assessment of capture fisheries is, both in terms of method development and measurement, not well developed. The objective of this study, therefore, was to develop a method consisting of indicators and rubrics (i.e. categories that articulate levels of performance) to assess social sustainability of capture fisheries. This method was applied to a Norwegian trawler that targets cod and haddock in the northeast Atlantic. Based on previous research, 13 social sustainability issues were selected. To measure the state of these issues, 17 process and outcome indicators were determined. To interpret indicator values, rubrics were developed for each indicator, using standards set by international conventions or data retrieved from national statistics, industry agreements or scientific publications that explore rubric scales. The indicators and rubrics were subsequently used in a social sustainability assessment of a Norwegian trawler. This assessment indicated that overall, social sustainability of this trawler is relatively high, with high rubric scores, for example, for worker safety, provisions aboard for the crew and companies' salary levels. The assessment also indicated that the trawler could improve on healthy working environment, product freshness and fish welfare during capture. This application demonstrated that our method provides insight into social sustainability at the level of the vessel and can be used to identify potential room for improvement. This method is also promising for social sustainability assessment of other capture fisheries.
De Nederlandse visverwerkende industrie en visgroothandel : economische analyse van de sector, ontwikkelingen en trends
Beukers, R. - \ 2015
Den Haag : LEI Wageningen UR (Report LEI 2014-026) - ISBN 9789086157099 - 87
visverwerkende industrie - handel - vis - economische analyse - tendensen - werkgelegenheid - omzet - import - export - fish industry - trade - fish - economic analysis - trends - employment - turnover - imports - exports
Dit onderzoek geeft inzicht in de economische situatie van de visverwerkende industrie en visgroothandel in Nederland door een analyse van de economische structuur van de sector en de belangrijkste ontwikkelingen. De bedrijven in de visverwerkende industrie en visgroothandel hadden in 2013 een gezamenlijke omzet van 3.6 miljard euro; een groei van 7% ten opzichte van de omzet in 2009. 70% van de totale omzet van Nederlandse visverwerkende bedrijven en visgroothandels werd behaald uit export; 30% werd gerealiseerd op de binnenlandse markt.
Van Discards naar Bijvangst in de Pelagische Visserij
Goudswaard, P.C. - \ 2015
Yerseke : IMARES (Rapport / IMARES Wageningen UR C067/15) - 27
visserij - pelagische visserij - discards - bijvangst - zeevisserij - eu regelingen - visserijbeleid - vangstsamenstelling - vis - fisheries - pelagic fishery - bycatch - marine fisheries - eu regulations - fishery policy - catch composition - fish
De pelagische diepvriestrawler visserij richt zich volledig op vis die geschikt is voor humane consumptie. Per 1 januari 2015 is de pelagische zeevisserij in de Europese wateren geconfronteerd met een verplichting om alle gevangen soorten waarvan een vangst quotum is vastgesteld, aan land te brengen en niets van deze vissoorten over boord te zetten. Dit is de eerste realisatie van een reeks aanlandverplichtingen van vis in het kader van het Europese Gemeenschappelijke Visserij Beleid. De aanlanding van deze visserij zal als gevolg van de aanlandplicht veranderen. In dit deelrapport wordt ingegaan op (i) de omvang en samenstelling van de hoeveelheid vis die onder het voormalige systeem als discards beschouwd wordt en (ii) in de hoeveelheid vis die als basis van mogelijke verwerkingsstappen voor valorisatie gebruikt kunnen worden. Daarnaast wordt een verwachting geschetst van de te verwachten hoeveelheid discards die aangeland moeten gaan worden onder de aanlandverplichting die vanaf 1 januari 2015 van kracht is. Dit geeft inzicht in de mogelijkheden voor industriële benutting van de “discards” die een waarde verhoging ten opzichte van laagwaardige verwerking tot vismeel meebrengt.
Social sustainability of cod and haddock fisheries in the northeast Atlantic: what issues are important?
Veldhuizen, L.J.L. ; Berentsen, P. ; Bokkers, E.A.M. ; Boer, I.J.M. de - \ 2015
Journal of Cleaner Production 94 (2015). - ISSN 0959-6526 - p. 76 - 85.
life-cycle assessment - environmental impacts - production systems - fish - categories - indicators - products - welfare - stress - salmon
Research on the sustainability of capture fisheries has focused more on environmental and economic sustainability than on social sustainability. To assess social sustainability, first relevant and important social sustainability issues need to be identified. The objective of this study was to identify relevant social sustainability issues for cod and haddock fisheries in the northeast Atlantic and to determine the importance of these issues based on stakeholder input. A heterogeneous group of stakeholders was invited to take part in two consecutive surveys on social sustainability issues. The first survey (n=41) resulted in a long list of 27 relevant social sustainability issues, including six issues that were not identified in previous studies and that address aspects of fish welfare, employees' training and education opportunities, and employees' time off from work. The second survey (n=51) resulted in a ranking of the social sustainability issues in order of importance. The most important issues are worker safety, product freshness and companies' salary levels. In general, social sustainability issues concerning working conditions, employees' job fulfilment and fish welfare are seen as more important than other social sustainability issues. A main discussion point concerns the relation between the importance of a social sustainability issue on the one hand and the type of need that the issue relates to and the state of the issue on the other hand. From the study it can be concluded that the relative importance of social sustainability issues differs per stakeholder group depending on the relation between the stakeholder group and each particular issue. This demonstrates the importance of consulting different stakeholder groups in future studies on social sustainability in order to get a balanced view on the importance of social sustainability issues. Results on the relevance and importance of social sustainability issues for cod and haddock fisheries in the northeast Atlantic enable the fishing industry and policy-makers to direct improvement efforts towards the more important issues. ©
Impact of a novel protein meal on the gastrointesinal microbiota and host transciptome of larval zebrafish Danio rerio
Rurangwa, E. ; Sipkema, D. ; Kals, J. ; Veld, M. ter; Forlenza, M. ; Bacanu, G.M. ; Smidt, H. ; Palstra, A.P. - \ 2015
Frontiers in Physiology 6 (2015). - ISSN 1664-042X - 27 p.
large gene lists - intestinal microbiota - gut microbiota - digestive physiology - solea-senegalensis - metal uptake - sp-nov - fish - expression - iron
Larval zebrafish was subjected to a methodological exploration of the gastrointestinal microbiota and transcriptome. Assessed was the impact of two dietary inclusion levels of a novel protein meal (NPM) of animal origin (ragworm Nereis virens) on the gastrointestinal tract (GIT). Microbial development was assessed over the first 21 days post egg fertilisation (dpf) through 16S rRNA gene-based microbial composition profiling by pyrosequencing. Differentially expressed genes in the GIT were demonstrated at 21 dpf by whole transcriptome sequencing (mRNAseq). Larval zebrafish showed rapid temporal changes in microbial colonization but domination occurred by one to three bacterial species generally belonging to Proteobacteria and Firmicutes. The high iron content of NPM may have led to an increased relative abundance of bacteria that were related to potential pathogens and bacteria with an increased iron metabolism. Functional classification of the 328 differentially expressed genes indicated that the GIT of larvae fed at higher NPM level was more active in transmembrane ion transport and protein synthesis. mRNAseq analysis did not reveal a major activation of genes involved in the immune response or indicating differences in iron uptake and homeostasis in zebrafish fed at the high inclusion level of NPM
Bodybuilding for fitter fish
Palstra, A.P. - \ 2015
Wageningen : Wageningen UR
vis - diergezondheid - visproductie - kweekvis - universitair onderzoek - fish - animal health - fish production - farmed fish - university research
Verschillende vissoorten groeien sneller als ze sporten, zegt onderzoeker Arjan Palstra. Kweekvissen krijgen nu maar weinig lichaamsbeweging, en worden daardoor obees. Door ze op de juiste snelheid te laten zwemmen, worden ze gezonder, en gaan ze ook nog eens efficiënter om met voer.
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