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.

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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.
Understanding social sustainability of capture fisheries
Veldhuizen, Linda J.L. - \ 2017
University. Promotor(en): Imke de Boer, co-promotor(en): Paul Berentsen; Eddy Bokkers. - Wageningen : Wageningen University - ISBN 9789462579644 - 159
fisheries - sustainability - animal welfare - cod - haddock - fishing methods - whitefish - northeast atlantic - visserij - duurzaamheid (sustainability) - dierenwelzijn - kabeljauw - schelvis - vismethoden - houting - noordoost atlantische oceaan

Fishing companies are faced with decreasing profitability and increasing competition. These companies can try to gain a competitive advantage by differentiating their products, e.g. by marketing new product attributes that consumers are interested in such as attributes relating to sustainability. Although consumers could be considerably interested in social sustainability of fish, this sustainability dimension has received little research interest so far. The main objective of this thesis is to understand social sustainability of capture fisheries. Social sustainability can be understood by applying the framework for social sustainability assessment, which consists of stakeholder consultation and issue selection, indicator development and quantification, and interpretation of the results, to the case considered. The case considered in this thesis was capture fisheries in the northeast Atlantic. Stakeholder consultation resulted in the identification of 27 social sustainability issues relevant for capture fisheries in the northeast Atlantic. Overall, social sustainability issues concerning working conditions, employees' job fulfilment and fish welfare were seen as more important than other social sustainability issues. Indicators were defined for the most important social sustainability issues of capture fisheries in the northeast Atlantic. To interpret values for each indicator, rubrics were developed that articulated levels of performance. Application of these indicators and their accompanying rubrics to a Norwegian trawler demonstrated that the indicators and rubrics provide insight into social sustainability at the level of the vessel, which can be used to identify potential room for improvement. To determine whether social sustainability issues can be used for product differentiation, consumer interest in social sustainability issues of whitefish from the northeast Atlantic was studied. Results from a choice modelling survey demonstrated that consumers prefer the issue fish welfare over the issues product quality, worker safety and local employment. Given the lack of overview of the knowledge on fish welfare, the most important social sustainability issue for consumers, the literature on this topic was reviewed to determine how the capture process in capture fisheries affects fish welfare, using the indicators external injuries and mortality. This review showed that scale, skin and fin injuries occur more frequently in trawls, purse seines, gillnets, traps and seines than in hooks, whereas hooking injuries occur in hooks only. Pressure injuries can occur in all gear types when deployed at greater depth. Trawls, purse seines and seines result in higher mortality than gillnets, hooks and traps. Mortality appears to increase with decreasing fish length, and differs across fish species. A greater capture depth and a longer fishing duration were associated with more external injuries and higher mortality, whereas a large change in water temperature, a longer duration of air exposure and a high density in the net were associated with higher mortality only. This thesis shows that application of the framework for social sustainability assessment to capture fisheries in the northeast Atlantic leads to an understanding of social sustainability that fishing companies can use to their advantage. In addition, this thesis shows that fishing companies in the northeast Atlantic need to start paying attention to fish welfare because consumers consider fish welfare the most important social sustainability issue of capture fisheries in the northeast Atlantic.

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
Monitoring cod catches of the Dutch demersal fleet in 2015
Trapman, B.K. ; Machiels, M.A.M. - \ 2016
IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C106/16) - 30
cod - fisheries - fish catches - monitoring - demersal fisheries - netherlands - kabeljauw - visserij - visvangsten - demersale visserij - nederland
Monitoring cod catches of the Dutch demersal fleet in 2014 : Investigating the effects of season and fishing gear on cod landings
Reijden, K.J. van der; Machiels, M.A.M. ; Trapman, B.K. ; Kraan, M.L. - \ 2016
IMARES (Report / IMARES C010/16) - 68 p.
cod - fish catches - monitoring - demersal fisheries - fishing gear - kabeljauw - visvangsten - demersale visserij - vistuig
In this report the results of the cod monitoring program are presented. This research was commissioned by the Dutch Ministry of Economic Affairs. Cod catches of the vessels in the gear groups BT2 (beam 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 fishing efforts of European fleets that catch cod. Fishing effort, based on historical track records, is allocated to different gear groups. Fishing effort can be transferred between gear groups but then conversion factors apply. 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, 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.
Heldere herleidbaarheid in de visketen
Asselt, E.D. van; Roest, J.G. van der; Staats, M. ; Kok, E.J. ; Cuijpers, H.J.J. ; Ruth, S.M. van - \ 2015
RIKILT Wageningen UR (RIKILT-rapport 2015.013) - 39 p.
technologie - visproducten - analytische methoden - naspeurbaarheid - vis - visverwerking - diepvriesvis - schaaldieren - garnalen - kabeljauw - verse producten - technology - fish products - analytical methods - traceability - fish - fish processing - frozen fish - shellfish - shrimps - cod - fresh products
Heldere herleidbaarheid betekent dat kenmerken die bij verkoop worden toegekend aan visproducten terug te herleiden zijn in de keten. Het gaat daarbij om aspecten als de vissoort, maar ook de geografische oorsprong en de processing van de vis. Om de consument volledig inzicht te bieden in productinformatie is de etiketteringswetgeving ((EU) 1169/2011) recent aangescherpt en dienen dergelijke aspecten op het etiket vermeld te worden. In dit project is onderzocht welke administratieve en analytische methoden gebruikt kunnen worden om de voorgeschiedenis van visproducten aan te tonen. Er is gewerkt aan vier deelprojecten die door de projectpartners als prioriteit werden aangemerkt: administratieve traceerbaarheid in de kabeljauwketen, aantonen van watergehaltes in garnalen, vaststellen van geografische oorsprong van witpootgarnalen en onderscheid tussen verse en ontdooide vis. De resultaten van deze vier onderzoeken zijn in dit rapport beschreven.
Cod monitoring; results 2015, quarter 3
Reijden, K.J. van der; Machiels, M.A.M. ; Trapman, B.K. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES C159/15) - 19
cod - osteichthyes - monitoring - fisheries - fish catches - bycatch - fishery resources - dutch waters - kabeljauw - visserij - visvangsten - bijvangst - visbestand - nederlandse wateren
The Cod monitoring program is part of the Dutch cod avoidance plan developed by the Dutch Government together with the Dutch fishing sector. The aim of this cod monitoring program is to provide information on the Catch per Unit Effort (CpUE) in the TR fleet (bottom trawls and seines). This is needed in order to calculate a conversion factor between the CpUE of the TR and the BT (beam trawl) gears. The transition of kW-days between gears is regulated by the European cod recovery plan (EC 423/2004 and EC 1342/2008) and depends on the yearly CpUE-ratio of cod between the respective gear groups. This report presents the results of the third quarter in 2015.
Cod monitoring : results 2015, quarter 2
Teal, L.R. ; Reijden, K.J. van der; Machiels, M.A.M. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES C150/15) - 18
cod - osteichthyes - fisheries - monitoring - fish catches - bycatch - dutch waters - fishery resources - kabeljauw - visserij - visvangsten - bijvangst - nederlandse wateren - visbestand
The Cod monitoring program is part of the Dutch cod avoidance plan developed by the Dutch Government together with the Dutch fishing sector. The aim of this cod monitoring program is to provide information on the Catch per Unit Effort (CpUE) in the TR fleet (bottom trawls and seines). This is needed in order to calculate a conversion factor between the CpUE of the TR and the BT (beam trawl) gears. The transition of kW-days between gears is regulated by the European cod recovery plan (EC 423/2004 and EC 1342/2008) and depends on the yearly CpUE-ratio of cod between the respective gear groups. This report presents the results of the second quarter in 2015.
Cod monitoring: Results 2015, quarter 1
Reijden, K.J. van der; Machiels, M.A.M. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES Wageningen UR C084/15) - 15
kabeljauw - monitoring - visvangsten - bijvangst - vistuig - visbestand - gadus morhua - cod - fish catches - bycatch - fishing gear - fishery resources
Between 2011 and 2013, the monitoring program existed of an extended analysis of self-reported cod catch data (both landings and discards) in combination with the regular DCF discard monitoring program, an extra observer program and the CCTV-project in TR-fisheries (see Kraan et al. (2013 and 2014)). Over the years, the ministry of Economic Affairs and IMARES drew the conclusion that monitoring cod discards via the self-reporting scheme asked for disproportionately high effort of the TR-skippers while discards were hardly affecting CpUE rates (Ministry of Economic Affairs (2014)). Therefore, it was agreed upon a yearly analysis of the EU-logbook (hereafter logbook) data in combination with VMS-data, which is readily available. However, to remain updated, an overview of fishing activity, cod catches and cod Landings per Unit Effort (LpUE) of four gear types per quarter is requested by the ministry of Economic Affairs. This report presents the results of the first quarter in 2015.
Cod monitoring: Results 2014, quarter 4
Reijden, K.J. van der; Machiels, M.A.M. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES Wageningen UR C071/15) - 15
visserij - kabeljauw - visvangsten - bijvangst - monitoring - nederlandse wateren - fisheries - cod - fish catches - bycatch - dutch waters
The Cod monitoring program is part of the Dutch cod avoidance plan developed by the Dutch Government together with the Dutch fishing sector. The aim of this cod monitoring program is to provide information on the Catch per Unit Effort (CpUE) in the TR fleet (bottom trawls and seines). To remain updated, an overview of fishing activity, cod catches and cod Landings per Unit Effort (LpUE) of all four gear types per quarter is requested by the ministry of Economic Affairs. This report presents the results of the fourth quarter in 2014.
Cod monitoring: Results 2014, quarter 3
Reijden, K.J. van der; Machiels, M.A.M. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES Wageningen UR C070/15) - 15
visserij - kabeljauw - visvangsten - bijvangst - monitoring - nederlandse wateren - fisheries - cod - fish catches - bycatch - dutch waters
The Cod monitoring program is part of the Dutch cod avoidance plan developed by the Dutch Government together with the Dutch fishing sector. The aim of this cod monitoring program is to provide information on the Catch per Unit Effort (CpUE) in the TR fleet (bottom trawls and seines). To remain updated, an overview of fishing activity, cod catches and cod Landings per Unit Effort (LpUE) of all four gear types per quarter is requested by the ministry of Economic Affairs. This report presents the results of the third quarter in 2014.
Cod monitoring: Results 2014, quarter 2
Reijden, K.J. van der; Machiels, M.A.M. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES Wageningen UR C069/15) - 15
visserij - kabeljauw - visvangsten - bijvangst - monitoring - nederlandse wateren - fisheries - cod - fish catches - bycatch - dutch waters
The Cod monitoring program is part of the Dutch cod avoidance plan developed by the Dutch Government together with the Dutch fishing sector. The aim of this cod monitoring program is to provide information on the Catch per Unit Effort (CpUE) in the TR fleet (bottom trawls and seines). To remain updated, an overview of fishing activity, cod catches and cod Landings per Unit Effort (LpUE) of all four gear types per quarter is requested by the ministry of Economic Affairs. This report presents the results of the second quarter in 2014.
Waarom zijn kabeljauwen zo dol op windmolens?
Lindeboom, H.J. - \ 2015
Universiteit van Nederland
noordzee - kabeljauw - windmolens - windmolenpark - biodiversiteit - macrofauna - lesmaterialen - north sea - cod - windmills - wind farms - biodiversity - teaching materials
Kabeljauwen halen hun geschubde schouders op om duurzame energie, en toch worden ze erg enthousiast van windmolens die in zee staan. De bodem waar die op rusten heeft namelijk 300 keer zo hoge biomassa dan andere stukken bodem. Prof. dr. Han Lindeboom van de Wageningen UR deed onderzoek naar die gebieden, en daarover vertelt hij in dit college.
Cod monitoring: Results 2014, quarter 1
Reijden, K.J. van der; Machiels, M.A.M. ; Kraan, M.L. - \ 2015
IJmuiden : IMARES (Report / IMARES Wageningen UR C029/15) - 15
visserij - kabeljauw - visvangsten - bijvangst - monitoring - nederlandse wateren - noordzee - fisheries - cod - fish catches - bycatch - dutch waters - north sea
The Cod monitoring program is part of the Dutch cod avoidance plan developed by the Dutch Government together with the Dutch fishing sector. The aim of this cod monitoring program is to provide information on the Catch per Unit Effort (CpUE) in the TR fleet (bottom trawls and seines). To remain updated, an overview of fishing activity, cod catches and cod Landings per Unit Effort (LpUE) of four gear types per quarter is requested by the ministry of Economic Affairs. This report presents the results of the first quarter in 2014.
Effectiviteit van het kabeljauwherstelplan Noordzee
Paijmans, A.J. ; Quirijns, F.J. - \ 2014
kabeljauw - noordzee - visbestand - herstelbeheer - visserijbeheer - maatregelen - cod - north sea - fishery resources - restoration management - fishery management - measures
Het kabeljauwherstelplan is nu ruim 10 jaar in werking. Visserijondernemers uit de kenniskring Transitie Zuid hebben de indruk dat, ondanks de maatregelen van het kabeljauwherstelplan, de kabeljauw nog steeds niet terug is in de Zuidelijke Noordzee. Zij vermoeden dat andere factoren, buiten het herstelplan om, hierbij een rol spelen. De visserijondernemers, willen meer weten over de ontwikkelingen in het kabeljauwbestand en de effectiviteit van het kabeljauwherstelplan. Met die kennis hopen ze beter mee te kunnen praten over maatregelen die bij moeten dragen aan het kabeljauwherstel.
Monitoring of cod catches in Dutch otter trawls and seines
Kraan, M.L. ; Machiels, M.A.M. ; Reijden, K.J. van der; Paijmans, A.J. - \ 2014
IJmuiden : IMARES (Report / IMARES Wageningen UR C105/14) - 22
kabeljauw - visvangsten - boomkorvisserij - visbestand - vistuig - netten - monitoring - gadidae - discards - cod - fish catches - beam trawling - fishery resources - fishing gear - nets
This report presents the results of the Dutch Cod Monitoring Project (TRMON) in the bottom trawls and seines (TR) that was carried out in 2013. Due to the Dutch Cod Avoidance Plan (DCAP), the transition of effort between different fishing gears is restricted.
Conditie kabeljauw bepalend voor letsel: onderzoek IMARES en ILVO naar de effecten van pulsvisserij op kabeljauw (interview met M. Soetaert en D. de Haan)
Soetaert, M. ; Haan, D. de - \ 2014
Visserijnieuws 34 (2014)7. - ISSN 1380-5061 - p. 6 - 6.
kabeljauw - pulsvisserij - wetenschappelijk onderzoek - cod - pulse trawling - scientific research
Pulsvisserij heeft effect op kabeljauw, zo blijkt in de praktijk.. Maar hoe groot is dat effect en is er mogelijk ook een oplossing? Recent onderzoek naar de effecten van elektrische pulsen op kabeljauw toont aan dat het aandeel met ruggengraatletsel zeer sterk varieert tussen verschillende experimenten. Alles wijst er op dat de conditie van de kabeljauw bepalend is bij het ontstaan van dit letsel. Een hogere pulsfrequentie zou een oplossing kunnen zijn. Kleine kabeljauw lijkt ongeschonden te kunnen ontsnappen. Maarten Soetaert van de Universiteit Gent/ILVO en Dick de Haan van IMARES lichten samen de resultaten van de onderzoeken toe.
Staandwantvisserij op platvis en kabeljauw
Quirijns, F.J. - \ 2013
IMARES / Kenniskringen Visserij
tong (vis) - kabeljauw - pleuronectiformes - vismethoden - netten - visserij - duurzaamheid (sustainability) - dover soles - cod - fishing methods - nets - fisheries - sustainability
In de staandwantvisserij gebruiken vissers netten die verankerd zijn op de bodem. De staandwantvisserij is een passieve visserij; vissen worden gevangen doordat ze verstrikt raken als ze erdoorheen proberen te zwemmen. Deze informatiebrochure gaat over de staandwantvisserij gericht op tong en de staandwantvisserij met grotere mazen gericht op kabeljauw of platvis. Er zijn ongeveer 60 (kleine) vaartuigen die zich bezighouden met deze visserijen.
The effects of electric pulse stimulation on cultured adult cod, continued research 2013
Haan, D. de; Soetaert, M. ; Verschueren, B. - \ 2013
IJmuiden : IMARES (Report / IMARES Wageningen UR C183/13) - 21
pulsvisserij - vis vangen - vistuig - kabeljauw - beschadigingen - pulse trawling - fishing - fishing gear - cod - injuries
In this experiment a toal of 83 adult cod were exposed, 53 specimen were exposed at 60 V and 30 specimen twice above the maximum commercially applied amplitude (120 V). In 5 cases vertebral injuries occurred of which 4 at 120 V and a single one at 60 V. When the type of stimulus is taken in account this single injury at 60 V amplitude represents an injury rate of 4.5 % of 22 exposed fish and 13% at 120 V (4 oout 30 specimen). Despite the same electrical parameters were set, none of the 21 fish exposed to the ILVO pulse generator was injured. All injuries occurred using the Delmeco TX68 pulse shape.
Monitoring of cod catches in Dutch otter trawls and seines
Kraan, M.L. ; Uhlmann, S.S. ; Machiels, M.A.M. ; Overzee, H.M.J. van; Helmond, A.T.M. van - \ 2013
IJmuiden : IMARES (Rapport / IMARES Wageningen UR C077/13) - 24
visserij - kabeljauw - discards - bijvangst - boomkorvisserij - fisheries - cod - bycatch - beam trawling
This report presents the results of the Dutch Cod Monitoring Project in the bottom trawls and seines (TR), that was carried out in 2011 and 2012. The monitoring project was set up to monitor the cod catches in the different TR gears in order to have better and more detailed information of the catch per unit effort (CpUE) of cod. The Dutch government requested IMARES to set this up in order to arrive at a well-documented conversion factor of the days at sea (DAS) transfer between different fishing gears. This transfer of effort is needed due to the transition of the Dutch fleet from a predominant BT fleet to much more TR vessels. The conversion factor of transfer of DAS from the beam trawl (BT) segment to the TR segment is impacted by the Cod Recovery Plan.
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