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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Monitoring cod catches of the Dutch demersal fleet in 2016
Hal, R. van; Machiels, M.A.M. - \ 2017
IJmuiden : Wageningen Marine Research (Wageningen Marine Research Report C056/17) - 29
monitoring - cod - beam trawling - pulse trawling - demersal fisheries - marine fisheries - fish catches - north sea - gadus morhua - kabeljauw - boomkorvisserij - pulsvisserij - demersale visserij - zeevisserij - visvangsten - noordzee
This report presents the results of the cod monitoring program 2016. The research was commissioned by the Dutch Ministry of Economic Affairs within the EZ-program Beleidsondersteunend Onderzoek. Cod catches of the vessels in the fleet segments BT2 (beam trawl and pulse trawl) and TR (otter trawls and seines) need to be monitored yearly, due to the Dutch implementation of the European cod recovery plan. The European cod recovery plan restricts the fishing effort of European fleets catching cod. Fishing effort, based on historical track records, is allocated to different gear groups. Fishing effort can be transferred between gear groups by use of conversion factors. In the Netherlands fishing effort is transferred yearly from the BT2 gear group to the TR group, based on a national conversion factor of 1:3 (BT:TR) kWdays instead of the European conversion factor of 1:16. This is because the cod catches in the Dutch TR fleet are not as high as the European conversion factor implies. In order to substantiate for the national conversion factor, the Dutch government is obliged to report cod catches per unit of effort (CpUE) of the vessels in these gear groups to the European Commission. An overview is provided of the fishing activity, the cod landings and the cod landings per unit of effort of the various gear categories in the BT2 and the TR fleet segments during the year 2016. First the cod Catch per Unit of Effort (CpUE) transition ratio between the BT2 on the one hand and the TR1C plus TR2 fleet segments on the other hand was calculated. And secondly the percentage of cod avoidance trips – trips during which 5% or less cod was caught – in the TR-fleet were calculated. The TR fleet has a higher cod CpUE on average than the BT fleet. When the cod targeted fisheries (TR1AB) are not taken into account, the CpUE effort transition ratio (TR1C+TR2): BT2 of 2016 lies between 4.2:1 and 5.7:1, depending on whether the ratio is calculated on the basis of minimum or maximum cod discards estimation by the Scientific, Technical and Economic Committee for Fisheries (STECF) respectively whereby in the minimum calculation the vessels participating in the CCTV program are excluded. Based on average discards estimations including all vessels, the ratio is 5.1:1. The percentage of cod avoidance trips, fishing trips with 5% cod or less in the total catches, in the TR1C and the TR2 fleets were 94% and 96% in 2016 respectively. These percentages are based on average STECF cod discards estimations. When minimum or maximum discards estimations are used, the calculated percentages of cod avoidance trips does not vary more than 2 or 3% from the percentage based on average estimations.
Schelpdierbestanden in de Nederlandse kustzone in 2017
Troost, K. ; Perdon, K.J. ; Zwol, J. van; Jol, J. ; Asch, M. van - \ 2017
IJmuiden : Stichting Wageningen Research, Centrum voor Visserijonderzoek (CVO) (CVO rapport 17.014) - 38
schaaldieren - visserij - natura 2000 - noordzee - ensis - spisula - visstand - biodiversiteitsbepaling - shellfish - fisheries - north sea - fish stocks - biodiversity assessment
The exploitation of wild shellfish has developed from free fisheries to a strongly regulated commercial activity, in which economic and ecological objectives are both aimed for. Within the framework of this policy an annual stock estimate is made for the economic important species: razor shell (Ensis directus) and cut-through shell (Spisula subtruncata), and other less economic species. The survey covers the entire Dutch coastal zone, and is commissioned by the Ministry of Economic Affairs. The fieldwork for the 23 th successive survey since 1995 was carried out in spring 2017. The principle objective of this survey is the assessment of the stock sizes of the economically important species Ensis directus and Spisula subtruncata in the Dutch coastal zone, including the Natura-2000 areas: “Noordzeekustzone”, “Voordelta”, “Vlakte van de Raan”, and the mouth of the Westerschelde estuary. In addition to the two most important species, we also report on the occurrence of three species of occasional economic importance: otter shell (Lutraria lutraria), striped venus clam (Chamelea striatula), and banded wedge shell (Donax vittatus). For the Dutch coastal zone the total stock size was estimated at 397.2 million kg fresh weight for razor shells, and 1,281.7 million kg fresh weight of cut-through shells. Stocks of the the other species were estimated at 18.1 million kg fresh weight for striped venus clams, 38.0 million kg fresh weight of banded wedge shells and 4,931 million individuals of otter shells. The stock of razor shells showed a sharp increase and was found to be the highest since 1995. The same can be said for the cut-through shells, where the stock of biomass increased to a level which is the highest since 1995. Also the stock of the otter shell and the banded wedge shell increased where the stock of the striped venus clam showed a slight decrease.
Sea floor litter monitoring : International Bottom Trawl Survey 2016
Hal, Ralf van - \ 2017
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C021/17) - 60
litter - environmental monitoring - marine environment - marine sediments - surveys - north sea - ligstro - milieumonitoring - marien milieu - mariene sedimenten - karteringen - noordzee
The Marine Strategy Framework Directive (MSFD) requires the European Member States to develop programmes of measures to achieve or maintain Good Environmental Status (GES) in European Seas. To be able to evaluate the quality state of the marine waters on a regular basis and the effect of measures taken, monitoring programs for MSFD descriptors and indicators have been established by the Member states. GES is described by 11 descriptors, and marine litter is one of them. The Dutch monitoring program for this descriptor includes amongst others the collection of data on the presence, abundance and distribution of litter on the seafloor. According to the Dutch program, the data on seafloor litter must be collected by statutory task fish surveys using standardized GOV fishing net, as a part of the International Bottom Trawl Survey (IBTS). This report presents the results of the seafloor litter monitoring during the IBTS survey of Quarter 1 2016. Seafloor litter data is collected annually during this survey since 2013, and the new data is presented in perspective of the data collected in previous years. This is done for the composition and the spatial distribution of the seafloor litter from the catch. The composition of the litter collected in 2016 is similar compared to earlier years; plastic and specifically rope/lines are the most dominant litter items found. The survey was again carried out on board the UK vessel CEFAS Endeavour, and the standard Dutch IBTS area including the Channel area was covered. Even though, due to a survey design based on random sampling within ICES rectangles, comparison in spatial distribution of litter as well as in estimates of the amount of litter between years is difficult. The spatial distribution of the litter seems random with small and large catches close to each other. It might be a result of small probability of actually catching litter items with a GOV trawl not designed for this purpose, or by differences in seafloor structure. It is possible to register additional habitat information and use this information in the data analysis After four years of litter sampling as part of the IBTS, inconsistencies in categorising the litter items are still found between national observers. In 2015 and 2016, close cooperation with CEFAS staff showed that these inconsistencies also exist between countries. The inconsistencies exist for a small number of subcategories, for which there is some arbitrary in how to divide items between them. Analysing the Dutch IBTS data by itself indicates a number of limitations, e.g. the spatial differences owing to a semi-randomized survey design between years, which could be overcome by combining the international data of the IBTS. This data can be found in the database developed and accessible via the ICES datacentre and combining the data is done within OSPAR.
Ecologisch Gericht Suppleren: meetplan geïntegreerde ecosysteem survey 2017
Baptist, Martin ; Bolle, Loes ; Couperus, Bram ; Tulp, Ingrid ; Hal, Ralf van - \ 2017
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C017/17) - 78
visfauna - benthos - zandsuppletie - natura 2000 - noordzee - kustbeheer - aquatische ecosystemen - habitatbeheer - mariene ecologie - fish fauna - sand suppletion - north sea - coastal management - aquatic ecosystems - habitat management - marine ecology
Suppleties van zand op vooroever of strand worden in opdracht van Rijkswaterstaat uitgevoerd om de Nederlandse kust tegen erosie te beschermen en om voldoende zand in het kustfundament te houden. Een groot deel van de suppleties vindt plaats in of nabij de kuststrook die binnen de Natura2000 regelgeving wordt beschermd, de Noordzeekustzone. Het is dus van belang de eventuele effecten van deze praktijk op de natuur zorgvuldig te bestuderen, zodat dit effect kan worden afgezet tegenover het algemene nut voor de maatschappij. Betere kennis van de effecten kan leiden tot beperking van eventuele schade aan- en mogelijk zelfs tot versterking van- gewenste natuurwaarden en ecosysteemdiensten. Tot nog toe is er relatief weinig aandacht geweest voor de gevolgen van suppleren op vispopulaties in vergelijking met benthos, terwijl de kinderkamerfunctie van de ondiepe kustzone een zeer belangrijke economische ecosysteemdienst levert. Kennis van de habitatfactoren die het voorkomen van juveniele vis in kinderkamers bepalen leidt tot een verbeterd inzicht van de gevolgen van suppleties op vispopulaties en van de voedselketen van viseters in de ondiepe kustzone. In overleg met natuurorganisaties en de kennisinstituten Deltares en Wageningen Marine Research is in 2016 het document `Ecologische effecten van zandsuppleties’ (Herman et al., 2016) geschreven met als doel onderzoek te formuleren naar ecologische effecten van zandsuppleties. In het onderdeel ‘uitvoeringsplan’ (deel C in Herman et al. 2016) zijn 3 onderzoekslijnen (ook wel Krachtlijnen genoemd) gedefinieerd, te weten: Vooroever, Duinen en Waddenzee. Het hier beschreven meetplan voor een survey in 2017 valt onder de onderzoekslijn Vooroever. De onderzoeksvraag die in dit meetplan wordt behandeld volgt uit de prioritering van de krachtlijn Vooroever: (Cumulatieve) gevolgen van reguliere suppleties op samenstelling en functioneren van het ecosysteem van de vooroever. Deze onderzoeksvraag luidt: “Wat zijn de cumulatieve gevolgen van reguliere suppleties op samenstelling en functioneren van het ecosysteem van de ondiepe vooroever van de Nederlandse kust?” Conform het plan van aanpak voor dit programma (Herman et al., 2016) wordt voorgesteld om een survey uit te voeren in de vooroever (0 tot 10-12 m diepte), waarbij benthos, vis en habitatkarakteristieken worden bemonsterd. Deze geïntegreerde ecosysteem survey is daarmee een onderdeel van een groter pakket van geplande dataverzameling in het kader van Ecologisch Gericht Suppleren II. Het hoofddoel van de survey is om data te verzamelen over het voorkomen van (juveniele) vis in relatie tot relevante omgevingsvariabelen, zowel abiotisch als biotisch. De survey zal inzicht verschaffen in het functioneren van het kustecosysteem en kennis opdoen over de wisselwerking met biotische en abiotische omgevingsvariabelen. De resultaten van de survey zullen dienen voor het opstellen van habitatmodellen voor juveniele vis om hiermee effecten van suppleties te kwantificeren. Dit rapport beschrijft de meetstrategie, de meetmethoden, de te meten variabelen (vis, benthos en omgevingsvariabelen) en de bemonsteringslocaties voor de ondiepe geïntegreerde ecosysteem survey 2017.
Flat oysters on offshore wind farms : opportunities for the development of flat oyster populations on existing and planned wind farms in the Dutch section of the North Sea
Smaal, Aad ; Kamermans, Pauline ; Kleissen, Frank ; Duren, Luca van; Have, Tom van der - \ 2017
Yerseke : Wageningen Marine Research (Wageningen Marine Research report C052/17) - 53
oyster culture - wind farms - offshore - shellfish culture - north sea - netherlands - oesterteelt - windmolenpark - schaal- en schelpdierenteelt - noordzee - nederland
Bat 1: Estimate of bat populations at the southern North Sea : Supporting note to ZDV report no. 2016.031 Migration bats at the southern North Sea
Lagerveld, S. ; Limpens, H.J.G.A. ; Schillemans, M.J. ; Scholl, M. - \ 2017
Den Helder : Wageningen Marine Research (Wageningen Marine Research report C014.17) - 14
chiroptera - migration - offshore - wind farms - north sea - migratie - windmolenpark - noordzee
To close the knowledge gap described above, or better said in order to make a start to overcome this crucial lack of insight into (sub)population sizes, RWS commissioned the Bats_1 study as part of the Wind op Zee Ecological Programma (Wozep; in English: Wind at Sea Ecological Programme), a multi-annual research programme initiated in view of the realisation of new offshore wind farms under the SER agreement (2013). Aim of the Bat_1 desk study is to estimate the extent to which (sub)populations of Nathusius’ Pipistrelle and possibly other relevant bat species, expressed in terms of numbers of individuals, use migration routes across the southern North Sea (SNS)1. This information is of great importance to be able to make better estimates of what the Potential Biological Removal (PBR) values are of Nathusius’ Pipistrelle and possibly other bat species, knowing that these values depend on the size of the (sub)populations to be considered.
Bat flight analysis around wind turbines : a feasibility study
Lagerveld, Sander ; Kooistra, Gert ; Otten, Gerwoud ; Meesters, Lydia ; Manshanden, Jasper ; Haan, Dick de; Gerla, Daan ; Verhoef, Hans ; Scholl, Michaela - \ 2017
Den Helder : Wageningen Marine Research (Wageningen Marine Research report C026/17) - 42
chiroptera - flight - animal behaviour - wind farms - offshore - north sea - netherlands - vliegen - diergedrag - windmolenpark - noordzee - nederland
This study, as part of the Wozep-project Behaviour and Collision Risk of Bats (Bats_2), investigates how bat behaviour can be studied near offshore wind turbines. To find out whether it is wise to continue and further develop behavioural research at wind turbines in the context of the Wozep programme, we first conducted a feasibility study on land.
Telemetry for migratory bats : a feasibility study
Lagerveld, Sander ; Janssen, René ; Manshanden, Jasper ; Haarsma, Anne-Jifke ; Vries, Simon de; Brabant, Robin ; Scholl, Michaela - \ 2017
Den Helder : Wageningen Marine Research (Wageningen Marine Research report C011/17) - 58
chiroptera - migration - telemetry - offshore - wind farms - biomonitoring - feasibility studies - north sea - netherlands - migratie - telemetrie - windmolenpark - biologische monitoring - haalbaarheidsstudies - noordzee - nederland
Overview of the international fishing activities on the Dogger Bank : update with Dutch, British, Danish, German, Belgian, Swedish and French data for 2010-2015
Hamon, Katell G. ; Hintzen, Niels T. ; Oostenbrugge, Hans J.A.E. - \ 2017
Wageningen : Wageningen Economic Research (Wageningen Economic Research memorandum 2017-050) - 35
fisheries - marine animals - fishery management - north sea - population dynamics - europe - cost benefit analysis - visserij - zeedieren - visserijbeheer - noordzee - populatiedynamica - europa - kosten-batenanalyse
This report is an update of the data and analysis on the value of the fishing activities of the Dutch, British, Danish, German, Belgian, Swedish and French fishing fleets on the proposed closed areas on the Dogger Bank. The effort, value and landings are presented for a five-year period (2010-2015) and show large variations over the last years, driven mainly by fishing opportunities for plaice for the Dutch and British fleets and sandeel for the Danish and German fleets.
Cruiserapport scheepstellingen van zeevogels op het Friese Front en op de Bruine Bank, 2016
Geelhoed, S.C.V. ; Leopold, M.F. - \ 2017
Den Helder : Wageningen Marine Research (IMARES rapport C032/17) - 36
zeevogels - noordzee - monitoring - luchtkarteringen - zeezoogdieren - biodiversiteitsbepaling - natura 2000 - sea birds - north sea - aerial surveys - marine mammals - biodiversity assessment
Het Friese Front en de Bruine Bank zijn twee nieuwe Vogelrichtlijngebieden in de Noordzee. Het Friese Front is aangewezen voor de Zeekoet. De Bruine Bank wordt waarschijnlijk aangewezen voor Zeekoet en Alk. Om te bepalen of de instandhoudingsdoelstellingen voor deze soorten worden gehaald, moeten de aantallen van deze soorten gemonitord worden. Monitoring van zeevogels in het Nederlandse deel van de Noordzee vindt plaats met behulp van MWTL-vliegtuigtellingen. Alken en Zeekoeten kunnen vanuit de lucht echter lastig van elkaar te onderscheiden zijn. Vanaf schepen is de herkenning eenvoudiger. Het onderhavige BO-project 'scheepstellingen zeevogels' dat in 2016-2018 loopt, heeft tot doel inzicht te geven in de aantallen van Alken en Zeekoeten in beide gebieden enerzijds, en anderzijds in de veranderingen in aantalsverhouding tussen beide soorten gedurende het jaar om de MWTL-vliegtuigtellingen te calibreren. In 2016 zijn drie scheerpssurveys uitgevoerd op het Friese Front (30 okt-4 nov) en op de Bruine Bank (14-17 mrt, 27 nov-1 dec). Op de Bruine Bank werden in maart 6021 individuen van 32 verschillende vogelsoorten geteld. Kleine Mantelmeeuw (n =1287), Drieteenmeeuw (n = 1101), Zeekoet (n = 1087) en Alk (n = 1081) domineerden de telling. Daarnaast werden 17 individuen verdeeld over drie soorten zeezoogdieren (Bruinvis, Gewone en Grijze Zeehond) geregistreerd. Tijdens de survey op het Friese Front in november werden 4184 individuen verdeeld over 36 verschillende vogelsoorten geteld. Zeekoet (n = 1364) en Alk (n = 628) waren de dominante soorten. Daarnaast werden 103 individuen verdeeld over drie soorten zeezoogdieren gezien. In november werden op de Bruine Bank 4356 individuen verdeeld over 24 verschillende vogelsoorten geteld. Zeekoet (n = 1326), Grote Mantelmeeuw (n = 1091) en Drieteenmeeuw (n = 878) domineerden de survey. Het aantal Alken (n = 162) was relatief laag. Daarnaast werden 50 Bruinvissen geregistreerd. Tijdens alle surveys behoorden Alken en Zeekoeten tot de talrijkste soorten. De verhouding tussen Alk en Zeekoet varieerde van 1:1 in maart op de Bruine Bank tot 1:8 op de Bruine Bank in november. Behalve van alkachtigen werden ook gegevens verzameld van potentieel kwalificerende N2000-soorten Kleine Mantelmeeuw (mrt Bruine Bank), Grote Mantelmeeuw (nov Friese Front en Bruine Bank) en Grote Jager (nov Friese Front en Bruine Bank). Dit rapport geeft een beknopt overzicht van de resultaten van de surveys in 2016. In 2018 worden de resultaten van deze en aanvullende surveys nader uitgewerkt en gepresenteerd in een eindrapportage.
Bouwen met Noordzee-natuur : uitwerking Gebiedsagenda Noordzee 2050
Rozemeijer, M.J.C. ; Slijkerman, D. ; Bos, O.G. ; Röckmann, C. ; Paijmans, A.J. ; Kamermans, P. - \ 2017
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C024/17) - 36
noordzee - natura 2000 - windmolens - kustbeheer - aquacultuur en milieu - natuurtechniek - ecologisch herstel - north sea - windmills - coastal management - aquaculture and environment - ecological engineering - ecological restoration
In dit rapport wordt het concept ‘Bouwen met Noordzee-natuur’ uitgewerkt tot een aantal adviezen aan het Ministerie van Economische Zaken (EZ) om ‘Bouwen met Noordzee-natuur’ een stap verder te brengen in de concretisering. De definitie van ‘Bouwen met Noordzee-natuur’ zoals gebruikt in dit rapport is: Het gebruik maken van de zee en de natuur op een manier die leidt tot versterking van het mariene systeem, de natuur en de biodiversiteit (bron: Gebiedsagenda Noordzee 2050). Dat laatste kan vervolgens worden geoperationaliseerd als versterking van behoud en duurzaam gebruik van soorten en habitats die van nature in de Nederlandse Noordzee voorkomen, dan wel meer specifiek in relatie tot inheemse soorten en habitats van Natura 2000- en KRM-soorten en -gebieden, en/of inheemse rode lijst-soorten, en inheemse soorten en habitats van de OSPAR-lijst. De kans op introductie van exoten moet daarbij geminimaliseerd worden. In het voorliggend document zijn kansen en knelpunten voor het concept Bouwen met Noordzee-natuur geïnventariseerd door middel van een kennisinventarisatie, interviews en een workshop met stakeholders.
Platte oesters in offshorewindparken (POP)
Smaal, Aad ; Kamermans, Pauline ; Kleissen, Frank ; Duren, Luca van; Have, Tom van der - \ 2017
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C035/17) - 52
ostrea edulis - oesters - oesterteelt - windmolenpark - offshore - noordzee - nederland - oysters - oyster culture - wind farms - north sea - netherlands
Dit rapport gaat over de mogelijkheden voor de ontwikkeling van populaties platte oesters (Ostrea edulis) binnen bestaande en geplande windmolenparken in het Nederlandse deel van de Noordzee. In opdracht van het Ministerie van EZ is nagegaan welke eisen de platte oester stelt aan de omgeving, gericht op de habitatkarakteristieken van windparklocaties in de Noordzee. Daarbij is er vanuit gegaan dat er binnen de windparken geen sprake is van bodemberoerende activiteiten die nadelig zijn voor platte oesters.
North Sea reefs : benthic biodiversity of artificial and rocky reefs in the southern North Sea
Coolen, Joop Waltherus Petrus - \ 2017
University. Promotor(en): S. Degraer. - Wageningen : Wageningen University - ISBN 9789463430876 - 199
coral reefs - benthos - biodiversity - north sea - marine ecology - marine organisms - ecosystems - koraalriffen - biodiversiteit - noordzee - mariene ecologie - zee-organismen - ecosystemen

The objective of the research presented in this thesis was to understand the patterns of benthic biodiversity on reefs in the North Sea. To gain this understanding, I studied which species are present on natural and artificial reefs, what environmental and biotic variables influence the presence and absence of a selection of these species and one of the possible pathways by which these species may colonise the reefs studied; the stepping stone effect. The first goal was to increase the available knowledge on which species are present at reefs. The second goal was to understand the patterns observed in the variation of species at these reefs. The third goal was to evaluate whether Mytilus edulis utilises offshore artificial structures as stepping stone to colonise very far offshore locations. The final goal was to assess the impact artificial reefs have on the benthic biodiversity of the North Sea. To attain these goals, natural and artificial reefs were sampled using diver operated airlift samplers and box corers. To evaluate the effects generalised linear and additive models were created. When available, additional data from other sources were also used.

The following conclusions are drawn: Lanice conchilega is an ecosystem engineer creating intermediate sand-reef systems. When rocky reefs are present on a sandy bottom, local biodiversity is doubled. Distributions of the native Caprella linearis and the invasive Caprella mutica showed a significant difference, demonstrating that C. linearis’ habitat preference does not fully overlap with that of C. mutica. Thus, the native and alien Caprellids are likely to be able to co-exist in the North Sea. M. edulis presence increases habitat heterogeneity, which increases species richness. Mytilus edulis uses offshore structures as stepping stones to colonise locations in the North Sea that cannot be reached in a single generation.

Depth, location effect and habitat type influence the species composition on North Sea reefs most strongly. The relation between depth and species richness on artificial reefs is non-linear, with a maximum at intermediate depths. Although substrates with mixed surface orientation (i.a. rocks) hold the most species rich communities, biodiversity is also strongly influenced by M. edulis and Psammechinus miliaris. When artificial reefs are to be colonised by communities that are similar to natural reefs, their structures should resemble natural reefs as much as possible.

Spatial distribution and habitat preference of harbour seals (Phoca vitulina) in the Dutch North Sea
Aarts, Geert ; Cremer, Jenny ; Kirkwood, Roger ; Wal, Jan Tjalling van der; Matthiopoulos, Jason ; Brasseur, Sophie - \ 2016
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport C118/16) - 43
seals - phoca vitulina - spatial distribution - habitats - animal ecology - marine ecology - north sea - netherlands - zeehonden - ruimtelijke verdeling - dierecologie - mariene ecologie - noordzee - nederland
Benthic development around a gas platform in the North Sea -: a small scale closure for fisheries : a trait based approach
Glorius, Sander ; Hal, Ralf van; Kaag, Klaas ; Weide, Babeth van der; Chen, Chun ; Kooten, Tobias van - \ 2016
Den Helder : Wageningen Marine Research (Wageningen Marine Research rapport ) - 42
benthos - aquatic communities - aquatic ecology - fisheries - north sea - aquatische gemeenschappen - aquatische ecologie - visserij - noordzee
This project looked at the effect of closing an area for fisheries on the development of the benthic community. An existing data set of benthic species densities sampled at different distances and angles from a platform was used for this purpose. The particular area was closed due to the installation of a gas production platform, but is likely to function as a marine protected area (MPA), with the expectation that the benthic community develops differently from the benthic community in the surrounding areas as it no longer has to cope with the impact of fisheries. Differences in development might be linked to the impact of fisheries and the effects of closure might provide an expectation for the effect of planned MPAs in similar areas.
Soortenlijst Nederlandse Noordzee
Bos, O.G. ; Gittenberger, A. ; Boois, I.J. de; Asch, M. van; Wal, J.T. van der; Cremer, J. ; Hoorn, B. van der; Pieterse, S. ; Bakker, P.A.J. - \ 2016
Wageningen : Wageningen Marine Research (Wageningen Marine Research rapport C125/16) - 108
waterorganismen - soorten - soortenrijkdom - biodiversiteit - mariene ecologie - noordzee - nederland - aquatic organisms - species - species richness - biodiversity - marine ecology - north sea - netherlands
In dit rapport is een soortenlijst opgesteld voor de Nederlandse Noordzee in opdracht van het ministerie van Economische Zaken. Er is behoefte aan een concrete lijst van inheemse en niet-inheemse Noordzeesoorten omdat het rijk direct en indirect werkt aan behoud en duurzaam gebruik van de van nature voorkomende biodiversiteit van het Nederlandse deel van de Noordzee, aan beleid over “Bouwen met Noordzeenatuur” en aan het volgen van niet-inheemse soorten (exoten) in de Noordzee.
Cod monitoring : results 2016, quarter 1
Trapman, B.K. ; Machiels, M.A.M. - \ 2016
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C105/16) - 19
cod - fisheries - monitoring - fish catches - north sea - dutch waters - kabeljauw - visserij - visvangsten - noordzee - nederlandse wateren
Fishing intensity around the BBL pipeline
Hintzen, Niels - \ 2016
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C102/16) - 27
visserij - vismethoden - pijpleidingen - bescherming - noordzee - fisheries - fishing methods - pipelines - protection - north sea
Wageningen Marine Research was requested by ACRB B.V. to investigate the fishing activities around the BBL pipeline. This gas pipeline crosses the southern North Sea from Balgzand (near Den Helder) in the Netherlands to Bacton in the UK (230km). This pipeline is abbreviated as the BBL pipeline. Part of the activities deployed by the owner of the BBL pipeline is to secure the integrity of the pipeline, which includes checking burial status, detecting free-spans and investigating internal and external threats to the integrity of the pipeline. Fishing is considered as one of the external threats to the pipeline where a collision with fishing gear could damage the pipeline, the fishing gear, the vessel or the crew. Therefore in areas with substantial fishing activity, extra care should be taken. Such a risk inventory becomes more and more common day practice of submarine pipeline and cable owners where discussions now focus on how to best spend effort on protecting pipelines and where to relieve specific burial requirements.
Growth and Innovation in the Ocean Economy : North Sea Checkpoint : Data Adequacy Report – Oil Platform Leak Challenge
Wal, J.T. van der; Vries, P. de; Tamis, J.E. - \ 2016
Den Helder : IMARES Wageningen UR (IMARES rapport C095/16) - 67
oceans - economics - innovations - emergencies - pollution - case studies - oil spills - north sea - oceanen - economie - innovaties - noodgevallen - verontreiniging - gevalsanalyse - olieverontreinigingen - noordzee
The economic feasibility of seaweed production in the North Sea
Burg, Sander W.K. van den; Duijn, Arie Pieter van; Bartelings, Heleen ; Krimpen, Marinus M. van; Poelman, Marnix - \ 2016
Aquaculture Economics & Management 20 (2016)3. - ISSN 1365-7305 - p. 235 - 252.
Economic modelling - north sea - seaweed - sensitivity analysis - wind energy

Seaweeds are increasingly seen as an alternative to land-grown products in food and feed applications. Interest in production of seaweeds in temperate waters is rising, in particular in combination with offshore wind energy generation. This article reports an investigation of the economic feasibility of seaweed production in the North Sea using economic modelling. Often, an overly positive picture of the costs and benefits of seaweed production is sketched. Based on current available information, offshore seaweed production in the North Sea is not economically feasible. Sensitivity analysis shows that revenues would have to increase by roughly 300%, all other things equal, to make a profit. A number of opportunities to improve the economic feasibility of a North Sea seaweed value chain are identified. Technical innovation and the design of systems that enable multiple harvests per year can reduce production costs. Successful marketing of seaweed as human food, and the development of biorefinery concepts can increase the value of the produced seaweed.

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