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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    Temperature: crucial factor in feather processing
    Goerner-Hu, X. ; Schneider, O. ; Scott, E.L. ; Bitter, J.H. - \ 2017
    The effect of food type (formulated diet vs. natural) and fish size on feed utilization in common sole, Solea solea (L.)
    Ende, Stephan S.W. ; Kroeckel, Saskia ; Schrama, Johan W. ; Schneider, Oliver ; Verreth, Johan A.J. - \ 2017
    Aquaculture Research 48 (2017)9. - ISSN 1355-557X - p. 4696 - 4706.
    common sole - energy utilization efficiency - maintenance requirement - protein utilization efficiency - ration level - Solea solea
    This study compares the effect of food type (formulated diet vs. natural food) and fish size on protein and energy utilization efficiencies for growth in common sole, Solea solea (L.). Replicate groups of common sole (mean initial body weight ± SD was 45.7 g ± 2.1 and 111.2 g ± 4.2) received the diets at five (natural feed) or four (formulated diet) feeding levels. The protein utilization efficiency for growth (kgCP) was higher (P > 0.001) in common sole fed ragworms than in common sole fed the formulated diet (respectively, 0.40 and 0.31). Likewise, the energy utilization efficiency for growth (kgGE) was higher (P = 0.001) in common sole fed ragworms than in common sole fed the formulated diet (respectively, 0.57 and 0.33). The protein maintenance requirement was not different between food types (P = 0.64) or fish size (P = 0.41) being on average 0.82 g kg−0.8 day−1. The energy maintenance requirement was not different between food type (P = 0.390) but differed between fish size (P = 0.036). The gross energy maintenance requirement of small common sole was 35 kJ g−0.8 day−1. The gross energy maintenance requirement of large common sole was 25 kJ g−0.8 day−1. In conclusion, the low growth of common sole fed formulated diets was related to reduced feed utilization.
    Feeding ragworm (Nereis virens Sars) to common sole (Solea solea L.) alleviates nutritional anaemia and stimulates growth
    Kals, J. ; Blonk, R.J.W. ; Palstra, A.P. ; Sobotta, Tim ; Mongile, Fulvio ; Schneider, O. ; Planas, J.V. ; Schrama, J.W. ; Verreth, J.A.J. - \ 2017
    Aquaculture Research 48 (2017)3. - ISSN 1355-557X - p. 752 - 759.
    solea-solea l - nereis virens Sars - growth - anaemia - hepcidin - gene expression
    Common sole fed with commercial pellets develop anaemia and are restricted in their growth performance. The anaemia can be the result of a difference in feed intake, a nutritional deficiency, an inflammatory response to infection or combinations of these aspects. In this study, it was investigated whether feeding ragworm would alleviate the anaemia and stimulate growth. Sole were fed one of three diets: a commercial feed, a commercial feed treated with ragworm extract or chopped ragworm. By comparing groups, three hypotheses were tested: (1) feeding ragworm alleviates the anaemia and positively affectS the sole’s metabolic performance reflected in feed intake, feed efficiency and growth; (2) anaemia is alleviated by a higher feed intake when feeding ragworm and (3)
    anaemia is caused by an inflammatory response to infection. The sole fed with a commercial diet suffered from anaemia. Feeding sole with ragworm alleviated the anaemia as the average haematocrit level nearly doubled in these fish as
    compared to fish fed pellets. Investigation of the expression of genes in the liver indicated that the anaemia in sole fed pellets is a nutritional anaemia and not an anaemia due to an inflammatory response. Sole fed ragworm showed improved
    growth which may be a consequence of the higher haematocrit levels in these fish increasing their oxygen carrying capacity. Addition of ragworm extract to the pellets levelled the feed intake between pellets and ragworm, but did not
    improve the anaemic state of sole and had only a limited effect on growth
    Feed intake, growth and nutrient retention of common sole (Solea solea L.) fed natural prey and an artificial feed
    Ende, S.S.W. ; Kroeckel, S. ; Schrama, J.W. ; Schneider, O. ; Verreth, J.A.J. - \ 2016
    Aquaculture Research 47 (2016)3. - ISSN 1355-557X - p. 681 - 688.
    This study compares growth, intake and retention efficiencies of nutrients and energy between common sole (Solea solea L.) fed ragworm (Nereis virens, Sars), blue mussel (Mytilus edulis L.) and an artificial (commercial) feed. Food types were fed to common sole (mean initial body weight: 44.9 ± 2.3 g) in excess three times a day over a 54-day-period. The growth rate in common sole fed the natural prey (8.5 g kg-0.8 d-1) was significantly higher compared to the growth rate in fish fed the artificial feed (5.1 g kg-0.8 d-1). Nutrient and energy intake was significantly lower in common sole fed the artificial feed than in fish fed natural prey. The only exception was fat intake which was higher in common sole fed the artificial feed in contrast to fish fed the natural prey. Nutrient and energy retention efficiencies were significantly lower in common sole fed the artificial feed than in fish fed the natural prey. In conclusion, the low growth in common sole fed the artificial feed was related to lower nutrient and energy intake as well as lower nutrient and energy retention efficiencies. It is suggested that reduced intake of the artificial feed might be related to the high dietary fat content of the artificial feed.
    How to measure the economic impacts of changes in growth, feed efficiency and survival in aquaculture
    Kankainen, M. ; Setala, J. ; Berrill, I.K. ; Ruohonen, K. ; Noble, C. ; Schneider, O. - \ 2012
    Aquaculture Economics & Management 16 (2012)4. - ISSN 1365-7305 - p. 341 - 364.
    atlantic salmon - rainbow-trout - selection
    In this article we introduce a variety of bio-economic models that can be used to calculate the economic benefits associated with improved productivity in aquaculture. In the aquaculture industry, three important biological productivity factors are growth, survival and feed efficiency. The profitability of improving productivity factors, especially growth, is highly dependent upon the cost factor structure, production system, its constraints and other factors within the supply chain. Therefore we present a number of different bio-economical models that can be used to robustly assess the economic impacts in different production environments. These models are introduced with case examples across a range of aquaculture species and production systems. We calculate changes in profitability through a reduction in production costs and any potential increases in product price premiums via the use of weight dependent unit profit as the outcome in cost-benefit analysis, so that results may be expanded to cover different volumes.
    A multi-disciplinary framework for bio-economic modeling in aquaculture: a welfare case study
    Noble, C. ; Berrill, I.K. ; Waller, B. ; Schneider, O. ; Kole, A.P.W. - \ 2012
    Aquaculture Economics & Management 16 (2012)4. - ISSN 1365-7305 - p. 297 - 314.
    animal-welfare - farm
    This article summarizes the framework that translated data from multiple disciplines into a bio-economic decision tool for modeling the costs and benefits of improving fish welfare in commercial aquaculture. This decision tool formed the basis of a recent EU research project, BENEFISH which was funded via the European Commission's Sixth Framework (FP6) initiative. The bio-economic decision model can incorporate biological data, productivity data, micro (farm) and macro (industry) level economic data, and consumer marketing and business to business data. It can identify areas for potential added value that might be achieved by improving fish welfare across a range of species and husbandry systems within European aquaculture. This article provides a brief overview of the minimum data requirements for successfully modeling the bio-economic impacts of improvements in farmed fish welfare using the model developed during the BENEFISH project. It also highlights potential bottlenecks and the minimum prerequisites for each potential data set to be used for successful modeling.
    Welfare interventions in flatfish recirculation aquaculture systems and their economical implications
    Schneider, O. ; Schram, E. ; Kals, J. ; Heul, J.W. van der; Kankainen, M. ; Mheen, H.W. van der - \ 2012
    Aquaculture Economics & Management 16 (2012)4. - ISSN 1365-7305 - p. 399 - 413.
    turbot scophthalmus-maximus - trout culture-system - juvenile turbot - water-quality - growth - ozonation
    The effect of temperature and pH on the growth and physiological response of juvenile yellowtail kingfish Seriola lalandi in recirculating aquaculture systems
    Abbink, W. ; Blanco Garcia, A. ; Roques, J.A.C. ; Partridge, G. ; Kloet, K. ; Schneider, O. - \ 2012
    Aquaculture 330-333 (2012). - ISSN 0044-8486 - p. 130 - 135.
    acid-base-balance - cod gadus-morhua - stress-response - atlantic cod - fish size - environmental hypercapnia - dicentrarchus-labrax - feed conversion - cold-water - sea bass
    A search for a viable new fish species for culture in recirculating aquaculture systems (RAS) in the Netherlands identified yellowtail kingfish Seriola lalandi as having excellent potential. To assist in determining the most appropriate water quality conditions for this species in RAS, the effect of water temperature (21, 23.5, 25, 26.5 and 29 °C) and pH (6.58, 7.16 and 7.85) was tested in two separate experiments. Growth performance, feed conversion, stress-physiological and metabolic parameters were assessed in juvenile yellowtail kingfish grown in pilot-scale RAS. Growth was optimised at a water temperature of 26.5 °C, in combination with maximum food intake and optimum food conversion ratio (FCR). Increasing temperature from 21 °C to 26.5 °C resulted in a 54% increase in the fish's final weight after 30 days. A water pH of 6.58 resulted in mortality and inhibited both growth and FCR due to physiological disruptions to which the fish could not adapt
    Group composition and stocking density affects behaviour and growth of sole (Solea solea)
    Mas-Munoz, J. ; Leigo, S. ; Schneider, O. ; Verreth, J.A.J. ; Schrama, J.W. - \ 2011
    Feeding Behaviour, Swimming Activity and Boldness Explain Variation in Feed Intake and Growth of Sole (Solea Solea) Reared in Captivity
    Mas-Munoz, J. ; Komen, J. ; Schneider, O. ; Visch, S.W. ; Schrama, J.W. - \ 2011
    PLoS ONE 6 (2011)6. - ISSN 1932-6203 - 9 p.
    salvelinus-alpinus l - plaice pleuronectes-platessa - oncorhynchus-mykiss walbaum - trout salmo-trutta - food-consumption - arctic charr - brown trout - atlantic salmon - dover sole - macropodus-opercularis
    The major economic constraint for culturing sole (Solea solea) is its slow and variable growth. The objective was to study the relationship between feed intake/efficiency, growth, and (non-) feeding behaviour of sole. Sixteen juveniles with an average (SD) growth of 2.7 (1.9) g/kg0.8/d were selected on their growth during a 4-week period in which they were housed communally with 84 other fish. Selected fish were housed individually during a second 4-week period to measure individual feed intake, growth, and behaviour. Fish were hand-fed three times a day during the dark phase of the day until apparent satiation. During six different days, behaviour was recorded twice daily during 3 minutes by direct observations. Total swimming activity, frequency of burying and of escapes were recorded. At the beginning and end of the growth period, two sequential behavioural tests were performed: “Novel Environment” and “Light Avoidance”. Fish housed individually still exhibited pronounced variation in feed intake (CV = 23%), growth (CV = 25%) and behavior (CV = 100%). Differences in feed intake account for 79% of the observed individual differences in growth of sole. Fish with higher variation in feed intake between days and between meals within days had significantly a lower total feed intake (r = -0.65 and r = -0.77) and growth. Active fish showed significantly higher feed intake (r = 0.66) and growth (r = 0.58). Boldness during both challenge tests was related to fast growth: (1) fish which reacted with a lower latency time to swim in a novel environment had significantly higher feed intake (r = -0.55) and growth (r = -0.66); (2) fish escaping during the light avoidance test tended to show higher feed intake (P
    A tool to improve sustainability of farming of fish in recirculation aquaculture systems
    Vis, J.W. van de; Gaag, M. van der; Schneider, O. ; Poelman, M. - \ 2010
    In: Proceedings Aquaculture Europe 2010, 05-10 October, Porto, Portugal. - - p. 1344 - 1345.
    A tool to improve sustainability of farming of fish in recirculation aquaculture systems
    Vis, J.W. van de; Gaag, M. van der; Schneider, O. ; Poelman, M. - \ 2010
    The Netherlands: Best practices in managing ecosystem impacts in aquaculture through RAS technologies
    Schneider, O. ; Schram, E. ; Poelman, M. ; Rothuis, A.J. ; Duijn, A.P. van - \ 2010
    In: Advancing the aquaculture agenda; workshop proceedings OECD - ISBN 9789264088719 - p. 259 - 273.
    The Dutch finfish aquaculture sector is unique in Europe and worldwide. This innovative sector is based solely on recirculation aquaculture systems (RAS). RAS are land based fish production systems in which water from the rearing tanks is re-used after mechanical and biological purification to reduce water and energy consumption and to reduce nutrient emission to the environment. The water consumption in RAS is entirely based on water exchange to compensate for evaporation, incidental losses and to control water quality. Because of its controllability, water temperatures in a RAS are kept constant at the optimal rearing temperature for the target species.
    Recirculation Aquaculture systems: A small but innovative Sector
    Schneider, Oliver - \ 2010
    Recirculation System in Europe: State of the Art and Prospects
    Schneider, Oliver - \ 2010
    The Dutch Case for Practices in Finfish Aquaculture Using RAS
    Schneider, Oliver - \ 2010
    The Dutch case for practices in finfish aquaculture using RAS
    Schneider, Oliver - \ 2010
    Consistency of individual differences in burying and anti-predator behaviour and its relationship with body weight and growth in sole (solea solea)
    Mas Muñoz, J. ; Schneider, O. ; Komen, J. ; Schrama, J.W. - \ 2010
    In: Proceedings of the 9th International Congress on the Biology of Fish, Barcelona, Spain, 5-9 July 2010. - - p. 158 - 158.
    Variation in growth, feed intake and behaviour of sole
    Mas Muñoz, J. ; Schneider, O. ; Komen, J. ; Schrama, J.W. - \ 2010
    In: Proceedings of the 44th Congress of the International Society for Applied Ethology (ISAE), Uppsala, Sweden, 4-7 August 2010. - Wageningen : Wageningen Academic Publishers - ISBN 9789086861507 - p. 100 - 100.
    New developments in recirculating aquaculture systems in Europe: a perspective on environmental sustainability
    Martins, C.I. ; Eding, E.H. ; Verdegem, M.C.J. ; Heinsbroek, L.T.N. ; Schneider, O. ; Blancheton, J.P. ; Roque dÓrbcastel, E. ; Verreth, J.A.J. - \ 2010
    Aquacultural Engineering 43 (2010)3. - ISSN 0144-8609 - p. 83 - 93.
    life-cycle assessment - oreochromis-niloticus l. - trout oncorhynchus-mykiss - algal pond treatment - constructed wetlands - phosphorus removal - water-quality - nile tilapia - waste-water - coagulation/flocculation aids
    The dual objective of sustainable aquaculture, i.e., to produce food while sustaining natural resources is achieved only when production systems with a minimum ecological impact are used. Recirculating aquaculture systems (RASs) provide opportunities to reduce water usage and to improve waste management and nutrient recycling. RAS makes intensive fish production compatible with environmental sustainability. This review aims to summarize the most recent developments within RAS that have contributed to the environmental sustainability of the European aquaculture sector. The review first shows the ongoing expansion of RAS production by species and country in Europe. Life cycle analysis showed that feed, fish production and waste and energy are the principal components explaining the ecological impact of RAS. Ongoing developments in RAS show two trends focusing on: (1) technical improvements within the recirculation loop and (2) recycling of nutrients through integrated farming. Both trends contributed to improvements in the environmental sustainability of RAS. Developments within the recirculation loop that are reviewed are the introduction of denitrification reactors, sludge thickening technologies and the use of ozone. New approached towards integrated systems include the incorporation of wetlands and algal controlled systems in RAS. Finally, the review identifies the key research priorities that will contribute to the future reduction of the ecological impact of RAS. Possible future breakthroughs in the fields of waste production and removal might further enhance the sustainabilty of fish production in RAS.
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