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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    Biological and physical drivers of bio-mediated sediment resuspension: A flume study on Cerastoderma edule
    Cozzoli, Francesco ; Gomes Da Conceição, Tatiana ; Dalen, Jeroen Van; Fang, Xiaoyu ; Gjoni, Vojsava ; Herman, Peter M.J. ; Hu, Zhan ; Soissons, Laura M. ; Walles, Brenda ; Ysebaert, Tom ; Bouma, Tjeerd J. - \ 2020
    Estuarine Coastal and Shelf Science 241 (2020). - ISSN 0272-7714 - 54 p.
    bioturbation - cohesiveness - body size - allometry - sediment resuspension - Cerastoderma edule
    Predictive models accounting for the effect of bioturbation on sediment resuspension must be based on ecological theory as well as on empirical parametrizations. The scaling trend of individual metabolic and activity rates with body mass may be a key to the mechanistic understanding of the observed patterns. With this study we tested if general size scaling rules in bio-mediated sediment resuspension may apply to a broad range of physical contexts for the endobenthic bivalve Cerastoderma edule. The effect on sediment resuspension of populations of C. edule differing by individual size was measured across physical gradients of current velocity and sediment composition in terms of fraction of fine particles. C. edule were able to enhance the resuspension of sediment containing silt, while they had scarce effect on the resuspension of coarse sediment. The effect of bioturbation was maximal at intermediate current velocity, when the hydrodynamic forcing is not strong enough to overcome the abiotic sediment resistance but it is able to suspend the bioturbated sediment. Although differences in sediment silt content and intensities of hydrodynamic stress have a relevant influence in determining the bioturbators individual contribution to sediment resuspension, the observed mass scaling trend is consistent across all treatments and close to theoretical expectation for size scaling of individual metabolic rates. This observation supports the hypothesis that the contribution of individual bioturbators to sediment resuspension is directly related to their energy use. Therefore, the proposed approach allows the formulation of expectations of biotic contribution to sediment resuspension based on the general size scaling laws of individual energy use.
    Sandification vs. muddification of tidal flats by benthic organisms: A flume study
    Soissons, Laura M. ; Gomes da Conceiçâo, Tatiana ; Bastiaan, John ; Dalen, Jeroen van; Ysebaert, Tom ; Herman, Peter M.J. ; Cozzoli, Francesco ; Bouma, Tjeerd J. - \ 2019
    Estuarine Coastal and Shelf Science 228 (2019). - ISSN 0272-7714
    Benthic organisms - Cerastorderma edule - Ruditapes philippinarum - Sediment properties - Silt content - Suspended sediment concentration - Tidal flats

    Bioturbating benthic organisms have typically been characterised by how they modify the vertical sediment erosion thresholds. By means of several annular flume experiments, we aimed to understand how benthic organisms may affect grain-size sediment properties over time, and how this depends on the sediment type and the sediment loading of the water column. We compared the effect of two bioturbating macroinvertebrate species: a local dominant species, the cockle Cerastoderma edule and a spreading non-indigeneous species, the clam Ruditapes philippinarum. Our results indicate that the effect of benthic organisms on sediment dynamics is strongly dependent on both the prevailing environmental conditions and the benthic species present. If sediment is sandy, the benthos can gradually enhance the silt content of the sediment by mixing in part of the daily tidal sediment deposition. In contrast, if sediment is muddy, benthos can gradually decrease the silt content of the sediment by specifically suspending the fine fraction. Moreover, we observed that the native cockles had a stronger impact than invasive clams. Therefore, bioturbating benthos can have an important effect in determining the local sediment properties, with the outcome depending both on the species in question and the environmental conditions the bioturbator lives in. Our findings show that sediment bioturbation may have strong implications for tidal flat stability undergoing major changes from natural or anthropogenic sources.

    Searching attractants for the detection of potato Epitrix species
    Boavida, Conceicao ; Santos, Marcia ; Schuurman-de Bruin, A. ; Mumm, R. ; Barreto da Costa, Goncalo ; Booij, C.J.H. - \ 2019
    Revista de Ciencias Agrarias 41 (2019)Especial. - ISSN 0871-018X - p. 125 - 132.
    In order to identify volatile organic compounds (VOCs) attractive to Epitrix spp. adults, field and laboratory experiments were carried out in sequence. In the field, black nightshade potted plants attracted significantly more Epitrix
    spp. adults than potato, aubergine, tomato and common lambsquarters. Following this result, headspace samples were collected from non-infested and from E. papa infested plants of potato, aubergine and black nightshade. VOC profiling by GC-MS analysis identified potential attractants which were tested as single compounds or as a mixture in a field experiment (1,3-butanediol, Z3-6:Ac/Linalool (1:1), (E)-β-farnesene and a blank control). Traps baited with Z3-6:Ac/ Linalool (1:1) attracted significantly more E. papa and E. cucumeris adults than the control. To find synergist substances to improve the attractiveness of this mixture, the choice of individual E. papa adults between this mixture alone or combined with several other plant VOCs, was sequentially tested in a Y-tube olfactometer. Adding (E)-β-ocimene to Z3-6:Ac/Linalool (1:3) increased the attractiveness of the mixture. This result was verified in two field experiments. The results were promising and encourage more research.
    Phylogenetic classification of the world's tropical forests
    Slik, J.W.F. ; Franklin, Janet ; Arroyo-Rodríguez, Víctor ; Field, Richard ; Aguilar, Salomon ; Aguirre, Nikolay ; Ahumada, Jorge ; Aiba, Shin Ichiro ; Alves, Luciana F. ; Anitha, K. ; Avella, Andres ; Mora, Francisco ; Aymard, Gerardo A.C. ; Báez, Selene ; Balvanera, Patricia ; Bastian, Meredith L. ; Bastin, Jean François ; Bellingham, Peter J. ; Berg, Eduardo Van Den; Conceição Bispo, Polyanna Da; Boeckx, Pascal ; Boehning-Gaese, Katrin ; Bongers, Frans ; Boyle, Brad ; Brambach, Fabian ; Brearley, Francis Q. ; Brown, Sandra ; Chai, Shauna Lee ; Chazdon, Robin L. ; Chen, Shengbin ; Chhang, Phourin ; Chuyong, George ; Ewango, Corneille ; Coronado, Indiana M. ; Cristóbal-Azkarate, Jurgi ; Culmsee, Heike ; Damas, Kipiro ; Dattaraja, H.S. ; Davidar, Priya ; DeWalt, Saara J. ; Din, Hazimah ; Drake, Donald R. ; Duque, Alvaro ; Durigan, Giselda ; Eichhorn, Karl ; Eler, Eduardo Schmidt ; Enoki, Tsutomu ; Ensslin, Andreas ; Fandohan, Adandé Belarmain ; Farwig, Nina ; Feeley, Kenneth J. ; Fischer, Markus ; Forshed, Olle ; Garcia, Queila Souza ; Garkoti, Satish Chandra ; Gillespie, Thomas W. ; Gillet, Jean Francois ; Gonmadje, Christelle ; Granzow-De La Cerda, Iñigo ; Griffith, Daniel M. ; Grogan, James ; Hakeem, Khalid Rehman ; Harris, David J. ; Harrison, Rhett D. ; Hector, Andy ; Hemp, Andreas ; Homeier, Jürgen ; Hussain, M.S. ; Ibarra-Manríquez, Guillermo ; Hanum, I.F. ; Imai, Nobuo ; Jansen, Patrick A. ; Joly, Carlos Alfredo ; Joseph, Shijo ; Kartawinata, Kuswata ; Kearsley, Elizabeth ; Kelly, Daniel L. ; Kessler, Michael ; Killeen, Timothy J. ; Kooyman, Robert M. ; Laumonier, Yves ; Laurance, Susan G. ; Laurance, William F. ; Lawes, Michael J. ; Letcher, Susan G. ; Lindsell, Jeremy ; Lovett, Jon ; Lozada, Jose ; Lu, Xinghui ; Lykke, Anne Mette ; Mahmud, Khairil Bin; Mahayani, Ni Putu Diana ; Mansor, Asyraf ; Marshall, Andrew R. ; Martin, Emanuel H. ; Matos, Darley Calderado Leal ; Meave, Jorge A. ; Melo, Felipe P.L. ; Mendoza, Zhofre Huberto Aguirre ; Metali, Faizah ; Medjibe, Vincent P. ; Metzger, Jean Paul ; Metzker, Thiago ; Mohandass, D. ; Munguía-Rosas, Miguel A. ; Muñoz, Rodrigo ; Nurtjahy, Eddy ; Oliveira, Eddie Lenza De; Onrizal, ; Parolin, Pia ; Parren, Marc ; Parthasarathy, N. ; Paudel, Ekananda ; Perez, Rolando ; Pérez-García, Eduardo A. ; Pommer, Ulf ; Poorter, Lourens ; Qi, Lan ; Piedade, Maria Teresa F. ; Pinto, José Roberto Rodrigues ; Poulsen, Axel Dalberg ; Poulsen, John R. ; Powers, Jennifer S. ; Prasad, Rama Chandra ; Puyravaud, Jean Philippe ; Rangel, Orlando ; Reitsma, Jan ; Rocha, Diogo S.B. ; Rolim, Samir ; Rovero, Francesco ; Rozak, Andes ; Ruokolainen, Kalle ; Rutishauser, Ervan ; Rutten, Gemma ; Mohd Said, Mohd Nizam ; Saiter, Felipe Z. ; Saner, Philippe ; Santos, Braulio ; Santos, João Roberto Dos; Sarker, Swapan Kumar ; Schmitt, Christine B. ; Schoengart, Jochen ; Schulze, Mark ; Sheil, Douglas ; Sist, Plinio ; Souza, Alexandre F. ; Spironello, Wilson Roberto ; Sposito, Tereza ; Steinmetz, Robert ; Stevart, Tariq ; Suganuma, Marcio Seiji ; Sukri, Rahayu ; Sultana, Aisha ; Sukumar, Raman ; Sunderland, Terry ; Supriyadi, S. ; Suresh, H.S. ; Suzuki, Eizi ; Tabarelli, Marcelo ; Tang, Jianwei ; Tanner, Ed V.J. ; Targhetta, Natalia ; Theilade, Ida ; Thomas, Duncan ; Timberlake, Jonathan ; Morisson Valeriano, Márcio De; Valkenburg, Johan Van; Do, Tran Van; Sam, Hoang Van; Vandermeer, John H. ; Verbeeck, Hans ; Vetaas, Ole Reidar ; Adekunle, Victor ; Vieira, Simone A. ; Webb, Campbell O. ; Webb, Edward L. ; Whitfeld, Timothy ; Wich, Serge ; Williams, John ; Wiser, Susan ; Wittmann, Florian ; Yang, Xiaobo ; Yao, C.Y.A. ; Yap, Sandra L. ; Zahawi, Rakan A. ; Zakaria, Rahmad ; Zang, Runguo - \ 2018
    Proceedings of the National Academy of Sciences of the United States of America 115 (2018)8. - ISSN 0027-8424 - p. 1837 - 1842.
    Biogeographic legacies - Forest classification - Forest functional similarity - Phylogenetic community distance - Tropical forests

    Knowledge about the biogeographic affinities of the world's tropical forests helps to better understand regional differences in forest structure, diversity, composition, and dynamics. Such understanding will enable anticipation of region-specific responses to global environmental change. Modern phylogenies, in combination with broad coverage of species inventory data, now allow for global biogeographic analyses that take species evolutionary distance into account. Here we present a classification of the world's tropical forests based on their phylogenetic similarity. We identify five principal floristic regions and their floristic relationships: (i) Indo-Pacific, (ii) Subtropical, (iii) African, (iv) American, and (v) Dry forests. Our results do not support the traditional neo- versus paleotropical forest division but instead separate the combined American and African forests from their Indo-Pacific counterparts. We also find indications for the existence of a global dry forest region, with representatives in America, Africa, Madagascar, and India. Additionally, a northern-hemisphere Subtropical forest region was identified with representatives in Asia and America, providing support for a link between Asian and American northernhemisphere forests.

    The effect of tryptophan supplemented diets on brain serotonergic activity and plasma cortisol under undisturbed and stressed conditions in grouped-housed Nile tilapia Oreochromis niloticus
    Martins, C.I. ; Silva, P.I.M. ; Costas, B. ; Larsen, B.K. ; Santos, G.A. ; Conceicao, L.E.C. ; Dias, J. ; Overli, O. ; Höglund, E. ; Schrama, J.W. - \ 2013
    Aquaculture 400-401 (2013). - ISSN 0044-8486 - p. 129 - 134.
    trout oncorhynchus-mykiss - sole solea-senegalensis - neutral amino-acids - cod gadus-morhua - rainbow-trout - flesh quality - atlantic salmon - meat quality - preslaughter stress - interrenal activity
    Tryptophan (TRP) supplemented diets have been shown to have therapeutic effects in farmed animals including fish by modulating the activity of the neurotransmitter serotonin (5-hydroxytryptamine; 5-HT). The effects reported in fish have been obtained using individually-housed fish and include a reduction in stress response, aggression and stress-induced anorexia. In land farmed animals, TRP supplemented diets have also been shown to improve meat quality as a result of reduced stress during slaughter while in fish no data is currently available. This study aims at investigating whether short-term supplementation with TRP supplemented diets changes brain serotonergic activity and the stress response associated with slaughter handling in grouped-housed Nile tilapia Oreochromis niloticus. Adult fish (n = 108, 490.6 ± 4.0 g, 12 individuals per tank) were exposed to one of the three treatments (triplicates per treatment were used): control (0.48 g/100 g), TRP 4 × (1.87 g/100 g) and TRP 10 × (4.45 g/100 g) diets during 7 days. Afterwards, half of the fish in each tank were subjected to an acute stressor consisting of a combination of crowding and chasing, just prior to slaughter. The other half of the fish represented undisturbed conditions. Blood and brain samples were collected for cortisol and serotonergic activity analyses, respectively. Flesh quality was also assessed in both undisturbed and stressed fish for all treatments by measuring muscle pH and rigor mortis over a 72 h period. Results showed that the highest TRP supplemented diet (TRP 10 ×) induced a significant reduction in undisturbed plasma cortisol (10.57 ± 2.71 ng/ml) as compared to TRP 4 × (24.93 ± 3.19 ng/ml) and control diets (18.69 ± 2.94 ng/ml) and no effect on post-stress cortisol levels. After stress, the major 5-HT metabolite (5-hydroxyindoleacetic acid, 5-HIAA) was higher in the TRP 10 × (471.31 ± 60.95 ng/g) as compared to the other diets (TRP 4 ×: 313.52 ± 30.12 ng/g; control: 260.36 ± 19.65 ng/g). Stress before slaughter induced a significant increase in plasma cortisol (from 18.40 ± 1.76 ng/ml under undisturbed conditions to 80.34 ± 7.16 ng/ml), however, it was not sufficient to cause a faster deterioration of flesh quality. TRP supplement diets had also no effect on muscle pH and rigor mortis during the 72 h observation period. In conclusion, this study showed that only the highest levels of supplementation (10 × the control diet) affect serotonergic activity. However, these levels did not result in reduced stress responsiveness or improved flesh quality when an acute stressor is applied before slaughter. Therefore, these results underline the fact that effects of TRP on cortisol production are dose- and context-dependent, and further experiments are needed to determine under which conditions the optimal effect is obtained.
    Dietary nitrogen and fish welfare
    Conceicao, L.E.C. ; Aragao, C. ; Dias, J. ; Costas, B. ; Terova, G. ; Martins, C.I. ; Tort, L. - \ 2012
    Fish Physiology and Biochemistry 38 (2012)1. - ISSN 0920-1742 - p. 119 - 141.
    trout oncorhynchus-mykiss - bass dicentrarchus-labrax - solea-senegalensis kaup - beta-methylbutyrate hmb - plant protein-sources - bream sparus-aurata - nonspecific defense-mechanisms - cell-mediated-immunity - amino-acid-metabolism - large yellow croaker
    Little research has been done in optimizing the nitrogenous fraction of the fish diets in order to minimize welfare problems. The purpose of this review is to give an overview on how amino acid (AA) metabolism may be affected when fish are under stress and the possible effects on fish welfare when sub-optimal dietary nitrogen formulations are used to feed fish. In addition, it intends to evaluate the current possibilities, and future prospects, of using improved dietary nitrogen formulations to help fish coping with predictable stressful periods. Both metabolomic and genomic evidence show that stressful husbandry conditions affect AA metabolism in fish and may bring an increase in the requirement of indispensable AA. Supplementation in arginine and leucine, but also eventually in lysine, methionine, threonine and glutamine, may have an important role in enhancing the innate immune system. Tryptophan, as precursor for serotonin, modulates aggressive behaviour and feed intake in fish. Bioactive peptides may bring important advances in immunocompetence, disease control and other aspects of welfare of cultured fish. Fishmeal replacement may reduce immune competence, and the full nutritional potential of plant-protein ingredients is attained only after the removal or inactivation of some antinutritional factors. This review shows that AA metabolism is affected when fish are under stress, and this together with sub-optimal dietary nitrogen formulations may affect fish welfare. Furthermore, improved dietary nitrogen formulations may help fish coping with predictable stressful events.
    Polyphenols and human health : A prospectus
    Visioli, Francesco ; Lastra, Catalina Alarcón de la; Andres-Lacueva, Cristina ; Aviram, Michael ; Calhau, Conceição ; Cassano, Alfredo ; Archivio, Massimo D'; Faria, Ana ; Favé, Gaëlle ; Fogliano, Vincenzo ; Llorach, Rafael ; Vitaglione, Paola ; Zoratti, Mario ; Edeas, Marvin - \ 2011
    Critical Reviews in Food Science and Nutrition 51 (2011)6. - ISSN 1040-8398 - p. 524 - 546.
    Antioxidants - Bioavailability - Cancer - Cardiovascular disease - Metabolomics - Polyphenols

    The lay press often heralds polyphenols as panacea for all sorts of diseases. The rationale is that their antioxidant activity would prevent free radical damage to macromolecules. However, basic and clinical science is showing that the reality is much more complex than this and that several issues, notably content in foodstuff, bioavailability, or in vivo antioxidant activity are yet to be resolved. We summarize the recent findings concerning the effects of polyphenols on human health, analyze the current limitations at pitfalls, and propose future directions for research.

    Linking fearfulness and coping styles in fish
    Martins, C.I. ; Silva, P.I.M. ; Conceição, L.E.C. ; Costas, B. ; Höglund, E. ; Overli, O. ; Schrama, J.W. - \ 2011
    Feeding behavior and stress response explain individual differences in feed efficiency in juveniles of Nile tilapia Oreochromis niloticus
    Martins, C.I. ; Conceição, L.E.C. ; Schrama, J.W. - \ 2011
    Aquaculture 312 (2011)1-4. - ISSN 0044-8486 - p. 192 - 197.
    catfish clarias-gariepinus - salmon salmo-salar - beef-cattle - atlantic salmon - rainbow-trout - growth-performance - genetic-variation - metabolic differences - food-consumption - body-composition
    Feed efficiency is a trait of enormous importance in any animal production sector including aquaculture. Individuals that are more feed efficient need to use less feed to achieve similar growth rates as compared to less efficient individuals. Considering that feed represents the largest cost of production and one of the main causes for the ecological footprint of a farm, more knowledge on the extent of individual differences in feed efficiency and underlying physiological processes are needed. This study is the first to investigate individual differences in feed efficiency, measured as residual feed intake and its relationship with feeding behaviour and stress response in one of the most important farmed fish, the Nile tilapia. The individual feed intake of twenty-four juvenile of Nile tilapia was followed during 57 days. Fish were fed until apparent satiation with a commercial feed twice per day. Individual feed behavior was registered once per week and consisted on measuring the latency to start feeding (LAT, min), total feeding time (TFT, min) and the number of feeding acts (NFA, min). Blood samples for plasma cortisol was taken at the end of the experiment (control, indicative of undisturbed levels) and after a stress test (netting), 15 days after the previous sampling. Individual growth rates and residual feed intake were determined at the end of the experiment. Results show pronounced individual differences in residual feed intake as well as a significant correlation with both feeding behavior (feeding latency, total feeding time and number of feeding acts) and stress (cortisol) response. Cortisol levels obtained after the stress test and feeding behavior could explain differences in residual feed intake by 4%. These results show that individuals with higher feeding activity and higher cortisol response are less efficient fish. This suggests that individual differences in feeding activity and stress response explain part of the differences in feed efficiency by explaining variance in maintenance energy expenditure.
    Consistency of individual variation in feeding behaviour and its relationship with performance traits in Nile tilapia Oreochromis niloticus
    Martins, C.I. ; Conceição, L.E.C. ; Schrama, J.W. - \ 2011
    Applied Animal Behaviour Science 133 (2011)1-2. - ISSN 0168-1591 - p. 109 - 116.
    clarias-gariepinus burchell - african catfish - divergent selection - red junglefowl - growth - efficiency - consumption - intercross - allocation - stress
    Feed intake is commonly used as one of the most important performance indicators in fish. However, very little is known about the behavioural processes involved in ingesting food such as meal duration, feeding frequency and latency to start eating. This study aims at the characterization of feeding behaviour in Nile tilapia Oreochromis niloticus in terms of consistency of individual differences over time and correlation with performance traits. Seventy-two individuals were individually housed for 27 days. These fish had three different weight (age) categories: low (initial body weight: 61.32 ± 5.97 g), middle (151.19 ± 4.26 g) and high (265.90 ± 19.13 g), each containing 24 fish. Daily feed intake was recorded per fish. On days 8, 15 and 21 feeding behaviour was assessed by measuring the latency to start feeding (LAT, min), the total feeding time (TFT, min) and the number of feeding acts (NFA). In the end of the experimental period, fish were weighed and individual growth rate and feed efficiency (measured as residual feed intake) determined. Results show that feeding latency and the number of feeding acts have significant repeatability estimates for all weight classes. These estimates were, however, low in magnitude and decreased as the weight class increased. The correlation between the different feeding behaviours showed that individuals that are more active during feeding (higher NFA) on average, start to consume their feed earlier (lower LAT) and for longer periods (higher TFT). The number of feeding acts was significantly correlated with both feed intake and growth in all size classes. The residual feed intake was correlated with feeding latency only in the small weight class. These results showed that individual differences in feeding behaviour have low repeatability estimates and can partly explain differences in performance traits in juveniles of Nile tilapia
    Linking fearfulness and coping styles in fish
    Martins, C.I. ; Silva, P.I.M. ; Conceição, L.E.C. ; Costas, B. ; Höglund, E. ; Overli, O. ; Schrama, J.W. - \ 2011
    PLoS ONE 6 (2011)11. - ISSN 1932-6203
    guppy poecilia-reticulata - rainbow-trout - stress responsiveness - oncorhynchus-mykiss - personality-traits - investigating fear - plasma-cortisol - nile tilapia - behavior - neuroendocrine
    Consistent individual differences in cognitive appraisal and emotional reactivity, including fearfulness, are important personality traits in humans, non-human mammals, and birds. Comparative studies on teleost fishes support the existence of coping styles and behavioral syndromes also in poikilothermic animals. The functionalist approach to emotions hold that emotions have evolved to ensure appropriate behavioral responses to dangerous or rewarding stimuli. Little information is however available on how evolutionary widespread these putative links between personality and the expression of emotional or affective states such as fear are. Here we disclose that individual variation in coping style predicts fear responses in Nile tilapia Oreochromis niloticus, using the principle of avoidance learning. Fish previously screened for coping style were given the possibility to escape a signalled aversive stimulus. Fearful individuals showed a range of typically reactive traits such as slow recovery of feed intake in a novel environment, neophobia, and high post-stress cortisol levels. Hence, emotional reactivity and appraisal would appear to be an essential component of animal personality in species distributed throughout the vertebrate subphylum.
    Historical Analysis of Water Flows in the Rio Dulce Catchment
    Ertsen, M.W. ; Prieto, D. ; Pradhan, T.M.S. ; Angella, G. - \ 2005
    In: Water Resources Management III / de Conçeicao Cunha, M., Brebbia, C.A., Southhampton : WIT Press - ISBN 9781845640071 - p. 569 - 579.
    Pathogenicity of a root-knot nematode, Meloidogyne Javanica, on potential trap crops
    Conceicao, I.L.P.M. da; Janssen, R. ; Moreira, M.M.R. ; Abrantes, I.M.O. de; Almeida Santos, M.S.N. - \ 2005
    Solanum sisymbriifolium - a potential environmentally friendly cultural method for root-knot nematode management
    Conceicao, I.L.P.M. da; Janssen, R. ; Moreira, M.M.R. ; Abrantes, I.M.O. de; Almeida Santos, M.S.N. - \ 2005
    A review of the culture potential of Solea solea and S. senegalensis
    Imsland, A.K. ; Foss, A. ; Conceicao, L.E.C. ; Dinis, M.T. ; Delbare, D. ; Schram, E. ; Kamstra, A. ; Rema, P. ; White, P. - \ 2003
    Reviews in Fish Biology and Fisheries 13 (2003)4. - ISSN 0960-3166 - p. 379 - 407.
    turbot scophthalmus-maximus - halibut hippoglossus-hippoglossus - juvenile dover sole - parr-smolt transformation - salmo-salar l - bass dicentrarchus-labrax - seabream sparus-aurata - gilthead sea bream - free amino-acids - atlantic halibut
    A number of scientific studies have investigated aspects of soles ( Solea solea and S. senegalensis) ecology, population genetics and biology in their natural environment, and the species have been extensively studied in captivity during the last decade. Studies on the genetic population structure of sole indicate that several distinct breeding populations exist within its distributional range in European waters. Recent studies suggest a phylogenetic relatedness of S. solea and S. senegalensis, being found as closest sister lineages in most reconstructions. However, studies on molecular genetics and morphological traits give diagnostic differences that consistently lead to their taxonomic separation at the specific rank. Studies show that sole spawn readily in captivity, and the buoyant, fertilized eggs are easily collected. Stocking density during maturation should be 1-1.5 kg/m(2), and temperature should be kept above 16degreesC ( S. senegalensis) or between 8 and 12degreesC ( S. solea). In nature, the onset of spawning is related to a rise in temperature occurring during spring ( March-June). Salinity should be kept constant around 33-35& and the fish reared under simulated natural photoperiod ( LDN). In other cultured flatfish species, a change in the photoperiod is the key environmental signal used to manipulate and control maturation, but at present time there are no published work that verifies or contradicts this for either S. senegalensis or S. solea. Studies indicate that a mixture of inert and live food may increase the weaning success of sole fry, and this can be further enhanced by using attractants in the dry feed. Future experiments are needed to determine the ideal time to commence weaning and determine the minimum duration of this period. Studies on alternative feeding strategies are also required. The effect of temperature and photoperiod on juvenile growth has not been studied systematically in neither of the two species and the relative importance of a direct photoperiod effect on growth in sole therefore remains to be defined.
    Effect of an immunostimulating alginate on protein turnover of turbot (Scophthalmus maximus L.) larvae
    Conceicao, L.E.C. ; Skjermo, J. ; Skjak-Braek, G. ; Verreth, J.A.J. - \ 2001
    Fish Physiology and Biochemistry 24 (2001)3. - ISSN 0920-1742 - p. 207 - 212.
    Importance of the B2 domain of the Arabidopsis AB13 protein for Em and 2S albumin gene regulation
    Bies-Etheve, N. ; Silva Conceicao, J. da; Giraudat, J. ; Koornneef, M. ; Léon-Kloosterziel, K. ; Valon, C. ; Delseny, M. - \ 1999
    Plant Molecular Biology 40 (1999). - ISSN 0167-4412 - p. 1045 - 1054.
    Amino acid profiles and amino acid utilisation in larval African catfish (Clarias gariepinus): effects of ontogeny and temperature.
    Conceicao, L.E.C. ; Ozorio, R. ; Suurd, E.A. ; Verreth, J.A.J. - \ 1998
    Fish Physiology and Biochemistry 19 (1998). - ISSN 0920-1742 - p. 43 - 47.
    Cost of growth in larval and juvenile African catfish (Clarias gariepinus) in relation to growth rate, food intake and oxygen consumption.
    Conceicao, L.E.C. ; Dersjant-Li, Y. ; Verreth, J.A.J. - \ 1998
    Aquaculture 161 (1998). - ISSN 0044-8486 - p. 95 - 106.
    A preliminary model for dynamic simulation of growth in fish larvae: application to the African catfish (Clarias gariepinus) and turbot (Scophthalmus maximus).
    Conceicao, L.E.C. ; Verreth, J.A.J. ; Verstegen, M.W.A. ; Huisman, E.A. - \ 1998
    Aquaculture 163 (1998). - ISSN 0044-8486 - p. 215 - 235.
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