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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    VIP Rapportage "Steekproef schattingen demersale discards aan boord" : Rapportage Validering en opwerking uitkomsten project "demersale discardverwerking"
    Verkempynck, R. ; Machiels, M.A.M. - \ 2015
    IJmuiden : IMARES (Rapport / IMARES C166/15) - 23
    discards - quota's - visserij - demersale visserij - demersale vissen - discards - quotas - fisheries - demersal fisheries - demersal fishes
    Onder de aanlandplicht zullen de discards met het quotum verrekend worden. Daarom is het nodig om het totale gewicht en de samenstelling van de discards te bepalen. In dit rapport worden drie scenario’s voorgesteld waarbij het totale gewicht en de samenstelling van vijf soorten in de discards (schol, tong, roggen, wijting en schar) geschat moet worden voor het boomkorsegment.
    Consequences of discard survival under the landing obligation : Reporting validation and reprocessing project outcomes of "demersal discard processing"
    Verkempynck, R. ; Machiels, M.A.M. - \ 2015
    IJmuiden : IMARES (Report / IMARES C176/15) - 16
    discards - bycatch - demersal fisheries - demersal fishes - survival - solea - plaice - discards - bijvangst - demersale visserij - demersale vissen - overleving - solea - schol
    This report describes the results of a short and medium term forecast over the period 2016-2019 given different scenarios of discard survival rates (10-50%) of North Sea plaice and North Sea sole. Additionally, average value of landings over the year 2019 is calculated per scenario using the landings derived from the biomass and the average price per kg of both stocks. Potential loss in average gross revenue from value of landings can be inferred from these.
    Demersal Fish Monitoring Princess Amalia Wind Farm
    Hal, R. van - \ 2014
    IJmuiden : IMARES (Report / IMARES C125/14) - 53
    demersal fishes - wind farms - monitoring - shelter - demersale vissen - windmolenpark - monitoring - beschutting
    This report describes the results of field work in the Princess Amalia Wind Farm (in Dutch: Prinses Amaliawindpark, or PAWP). The field work meets the requirements of the Monitoring and Evaluation Programme, which is part of the Wbr-permit of the wind farm. The objective is to determine if the wind farm functions as a refugium for demersal fish. PAWP is expected to act as a refugium because fisheries are excluded in the farm area since 16 October 2007. It is expected that larger and older individuals as well as species sensitive to fisheries would have a better chance to survive, which would result in an increase in numbers and larger individuals.
    Species identification workshops 2012 and 2013: Gobies and Elasmobranchs
    Boois, I.J. de; Bolle, L.J. - \ 2013
    IJmuiden : IMARES (Report / IMARES Wageningen UR 13.009) - 16
    demersale visserij - elasmobranchii - pomatomidae - aquatische ecosystemen - identificatie - benthos - demersale vissen - demersal fisheries - elasmobranchii - pomatomidae - aquatic ecosystems - identification - benthos - demersal fishes
    Up until now, gobies of the genus Pomatoschistus have not been identified to the lowest taxonomic level during The Demersal Fish Survey (DFS), Sole Net Survey (SNS) and Beam Trawl Survey (BTS). It is however an abundant genus in the catches in the shallow coastal zone stations and it can be assumed that the species play a role in the coastal ecosystem. The correct identification on board is however questionable. For that reason, during the 2012 DFS extra attention has been paid to identification of Pomatoschistus species. On each of the three vessels carrying out the DFS, a Pomatoschistus expert (Cindy van Damme or Bram Couperus) was taken on board for one week. On board Stern and Schollevaar all Pomatoschistus have been identified to the species, and on board Isis part of the specimens were identified to the species, and part was taken to the lab. Samples were frozen following a protocol to keep the quality of the fish as good as possible and were taken back to the lab for identification. Main problems arose in identification of P. lozanoi and P. minutus. As even the experts did not agree, it is proposed to treat P. lozanoi and P. minutus as a group of species, and to identify the other species to the species level. From identification workshops and tests on demersal fish and benthos it became clear that specific attention should be paid to the elasmobranch species. On 20 March 2013 a dedicated species identification workshop focusing on elasmobranch species was organised for IMARES employees. Main purpose of the workshop was quality assurance of species identification of elasmobranch species. IMARES projects influenced by the quality of this species identification are i.a. the seagoing statutory task surveys, statutory task discard projects, PULSMON. The species to be identified were collected during the BTS2011 and BTS 2012 and stored in the freezer. Results are presented by expertise level of the employees. The expertise level was based on expertise and responsibilities during surveys and discard sampling. The results of the test and workshop were in line with earlier workshops focusing on fish and macrobenthos.
    Data evaluation of data limited stocks: Dab, flounder, Witch, Lemon Sole, Brill, Turbot and Horse mackerel
    Hammen, T. van der; Poos, J.J. - \ 2012
    IJmuiden : IMARES (Report / IMARES Wageningen UR C110/12) - 62
    visserijbeheer - visstand - demersale vissen - noordzee - fishery management - fish stocks - demersal fishes - north sea
    Several commercially important demersal fish stocks for the North Sea fisheries are classified by ICES (International Council for the Exploration of the Sea) as “data limited” stocks, which are stocks for which the data are insufficient to perform a full analytical assessment and forecast (ICES 2012b). Until 2012 for most of these ‘data-limited’ stocks , there was no quantitative management advice that is based on the status of the stock, because the status is unknown. In this report catch per unit of effort (CPUE) indices, spatial distributions, length frequencies and agelength relationships are analysed for 7 species that have commercial importance for Dutch fisheries: dab, flounder, witch flounder, lemon sole, brill, turbot and North Sea horse mackerel. The data in this report may be used in future for catch advice by the International Council for Exploration of the Sea (ICES).
    Spawning closures: ecological and economic trade-offs in management of mixed demersal flatfish fisheries in the North Sea
    Rijnsdorp, A.D. ; Overzee, H.M.J. van; Poos, J.J. - \ 2011
    IJmuiden : IMARES (Report / IMARES Wageningen UR C067/11) - 45
    visserijbeheer - vis vangen - demersale vissen - periode van kuitschieten - kuitschieten - duurzaamheid (sustainability) - effecten - fishery management - fishing - demersal fishes - spawning season - spawning - sustainability - effects
    The contribution of spawning closures to sustainable management of North Sea flatfish fisheries is explored using a spatial and temporal explicit model of four target species (sole, plaice, turbot and brill) and two bycatch species (cod, rays). Seasonal patterns in fishing effort and partial fishing mortality rates per day at sea by age group and area are estimated to quantify the effect of different spawning closure scenarios for sole and plaice on the exploitation pattern (F-at-age).
    Species composition, diversity, biomass and production of the demersal fish community of the North Sea
    Greenstreet, S.P.R. ; Fraser, H. ; Piet, G.J. ; Robinson, L. ; Callaway, R. ; Reiss, H. ; Ehrich, S. ; Kroncke, I. ; Craeymeersch, J.A.M. - \ 2007
    Aberdeen : Fisheries Research Services Marine Laboratory (Fisheries research services collaborative report no. 07/07) - 94
    vissen - soortendiversiteit - zeedieren - noordzee - diergemeenschappen - demersale vissen - demersale visserij - fishes - species diversity - marine animals - north sea - animal communities - demersal fishes - demersal fisheries
    Assessment demersal fish stocks Mauritania
    Corten, A.A.H.M. ; Goudswaard, P.C. ; Heessen, H.J.L. - \ 2006
    IJmuiden : IMARES (Report / IMARES C066/06) - 52
    visstand - visbestand - demersale visserij - demersale vissen - mauritanië - fish stocks - fishery resources - demersal fisheries - demersal fishes - mauritania
    The RIVO project "Assessment of demersal fish stocks in Mauritania" was commissioned by the Ministry of Foreign Affairs of The Netherlands to produce information on the state of the demersal fish stocks (species that live near the bottom) in Mauritania, in particular octopus and shrimps. These stocks are fished by fleets from the EU, working under the fishery agreement between the EU and Mauritania. Although there are no Dutch vessels targeting demersal fish in Mauritania, the government of The Netherlands is co-responsible for the fisheries agreement with Mauritania, and thereby for a rational and sustainable exploitation of the demersal resources.
    Evaluatie demersale visbestanden Mauritanie Jaarverslag 2004
    Corten, A.A.H.M. ; Goudswaard, P.C. ; Heessen, H.J.L. - \ 2005
    IJmuiden : RIVO (Rapport / Nederlands Instituut voor Visserij Onderzoek (RIVO) C045/05) - 17
    demersale vissen - visbestand - schaal- en schelpdierenvisserij - garnalen - mauritanië - demersal fishes - fishery resources - shellfish fisheries - shrimps - mauritania
    De werkzaamheden binnen het project werden in 2004 grotendeels volgens de bestaande planning uitgevoerd. Veel tijd werd gestoken in de analyse van al bestaande gegevens in de data base van het IMROP. Hoewel deze data base een aantal belangrijke tekortkomingen kent, kon op basis van de beschikbare informatie toch een redelijk beeld gevormd worden van de garnalenvisserij. De gegevens werden ook gebruikt tijdens twee workshops op het IMROP waarbij de toestand van de garnalenvisserij in Mauritanië werd geëvalueerd. Het bleek dat de garnalen in de ondiepe zone dicht onder de kust (langostino’s) al overbevist waren, terwijl dat voor de garnalen in de diepere zone (gamba’s) nog niet aantoonbaar was. Merkwaardig genoeg had de toename van de visserij inspanning op garnaal in eerste instantie niet geleid tot afname van de garnalenstand. Dit verschijnsel werd toegeschreven aan het wegvangen van de natuurlijke vijanden van de garnaal (grote vissen), waardoor er meer jonge garnalen volwassen konden worden. De gevolgen van de garnalenvisserij op andere visbestanden werden nog niet bekeken. Verwacht mag worden dat dit effect sterk negatief zal zijn.
    Demersal Fish Survey gegevens van het Eierlandsche Gat
    Bolle, L.J. - \ 2004
    IJmuiden : RIVO (RIVO rapport C043/04) - 7
    demersale visserij - demersale vissen - boomkorvisserij - visfauna - waddenzee - demersal fisheries - demersal fishes - beam trawling - fish fauna - wadden sea
    In het kader van een MER voor het leggen van een kabel tussen Texel en Vlieland, is het RIVO gevraagd om gegevens te leveren van de visfauna in het Eierlandsche Gat. Dit gebied wordt tijdens de “Demersal Fish Survey (DFS)” bemonsterd.
    Discards in de Nederlandse twinrigvisserij
    Keeken, O.A. van; Quirijns, F.J. ; Grift, R.E. - \ 2004
    IJmuiden : RIVO (RIVO rapport C011/04) - 57
    demersale visserij - demersale vissen - visstand - boomkorvisserij - discards - demersal fisheries - demersal fishes - fish stocks - beam trawling - discards
    The Netherlands Institute for Fisheries Research has been commissioned by the Dutch Fisheries Product Board to carry out a study on the effects of twin trawl fishery on the sustainable exploitation of demersal fish stocks. The twin trawl fishery appears to grow quickly, but there are many uncertainties about the advantages and disadvantages of this fishery on fish stocks. Advantages due to the light type of gear are the low use of fuel, the high quality of landings and the relatively low disturbance of the seabed. Negative effects mentioned are the large surface that is fished, which would result in high catches and large numbers of discards. Moreover, under certain conditions, twin trawlers are allowed to use smaller mesh sizes than beam trawlers, which may result in more discards of undersized fish. This study aims at making an objective and quantitative description of the twin trawl fishery in the Netherlands and consists of three parts: 1) a description of technical and fishery biological aspects; 2) a study on discards (part of the catch returned to the sea) and; 3) an integrated description of the twin trawl fishery and a comparison with the beam trawl fishery. The present report describes the second part: discarding in the twin trawl fishery. This report gives an overview of the discarding practices in the twin trawl fishery in the Netherlands.
    Beschrijving Nederlandse visserij in de Noordzee, EEZ en het Nederlandse kustgebied ten behoeve van Natuurbalans 2003
    Verver, S.W. ; Grift, R.E. ; Quirijns, F.J. - \ 2003
    IJmuiden : RIVO (RIVO Rapport / Nederlands Instituut voor Visserij Onderzoek nr.: C040/03) - 21
    demersale visserij - demersale vissen - pelagische visserij - boomkorvisserij - demersal fisheries - demersal fishes - pelagic fishery - beam trawling
    De Nederlandse demersale visserij richt zich met name op schol, tong, kabeljauw en wijting en heeft als belangrijke bijvangstsoorten tarbot en griet. Het aandeel van de Nederlandse visserij in de totale aanlandingen van de Noordzee bedraagt voor schol gemiddeld 52% op jaarbasis. Nederland heeft een groot aandeel in de tongvisserij en levert zo’n 90% van de totale aanlandingen van tong. Het Nederlands aandeel in de rondvis aanlandingen is beduidend lager. Gemiddeld bedragen de Nederlandse aanlandingen aan kabeljauw zo’n 13% en voor wijting 19% van de totale internationale aanlandingen. Voor de Nederlandse demersale visserij speelt de Exclusieve Economische Zone (EEZ) een belangrijke rol.
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