MSc thesis
Desk study of the technical and economic feasibility to use waste of fish processing industry in Surinam.
Study commanded by CREM (www.crem.nl); to be carried out in Amsterdam and Wageningen.
More information: Roel Bosma (WU/AFI) or Victor de Lange: 31 (0) 20 752 39 20.
More information, in Dutch: Visafvalstagiair.docx
Stage ARCADIS monitoring vismigratievoorzieningen
In het voorjaar start ARCADIS, in samenwerking met meerdere waterschappen, een groot monitoringsproject naar de werking van vispassages. Hierbij worden, met behulp van fuiken, alle vissen gevangen die gebruik maken van deze voorzieningen, waarbij wordt gekeken naar soort en lengte van de vis. Het doel is de functionaliteit en de effectiviteit van de vismigratievoorzieningen te beoordelen; is de voorziening passeerbaar voor alle doelsoorten en lengteklassen? En hoe verhouden de vangsten zich tot het aanbod van vis?
Voor dit project is ARCADIS op zoek naar een enthousiaste stagiair(e). De stage houdt in dat je voor 75% van de tijd bezig bent met het monitoringsproject; het legen van fuiken en het determineren van vissen tijdens de veldwerkdagen is hier een aanzienlijk deel van. De overige tijd zal worden besteedt aan het schrijven van een onderzoeksrapport, contact houden met de waterschappen en meedraaien in diverse projecten op gebied van aquatische ecologie en waterkwaliteit bij ARCADIS.
Start: februari (uiterlijk begin maart)
Periode: 4-5 maanden
Competenties: Zelfstandig een project uitvoeren, basiskennis van vissoorten, handigheid in veldwerk, contacten onderhouden de waterschappen, dataverwerking met Excel.
Heb jij interesse in deze stageplek? Stuur dan een mail met CV naar het volgende email adres: wilco.debruijne@arcadis.nl of bel 0627060568
Ir. Wilco de Bruijne | Adviseur Water | wilco.debruijne@arcadis.nl
ARCADIS Nederland BV | Het Rietveld 59a | 7321 CT Apeldoorn | Nederland
Postbus 673 | 7300 AR Apeldoorn | Nederland
T. +31 627060568 | M. +31 627060568 | F. 055 5815 599
www.arcadis.nl
ARCADIS, Imagine the result
AFI IMARES thesis possibility (contact Paul van Zwieten)
Tuna fisheries, pelagic habitats and population dynamics
In many tuna fisheries in the Indian and Pacific Oceans, Fish Aggregation Devices (FAD’s) are used, that attract both juvenile and adult tunas for a number of reasons. FAD’s modify the pelagic environment by creating new habitat and by doing so affect the behavioural ecology of tuna’s. The most likely hypoitheis of tuna’s aggregative behaviour around floating objects as FAD’s all focus on what tuna may expect to find around them: prey or conspecifics. It has long been thought that a major mechanism is that FAD’s increase the local productivity and hence prey availability, but there is limited evidence for this. As floating objects are usually found in more productive regions, tuna’s may as well use the floating objects as waypoints or as meeting points. In particular juvenile specimen of oceanic tuna’s as Yellowfin, Skipjack and Bigeye appear to be attracted. Juvenile fish occupy the area close to the water surface while adults are found in deeper waters below the FAD. However, the juveniles of Bigeye and Yellofin tuna’s are by-catch in fisheries aiming at adult specimen, or Skipjack. The interplay between the enhanced densities of tuna and juvenile mortality on the population has never been studied.
A recent theoretical study has shown that when juveniles and adults do not compete for prey a population is either dominated by juveniles or by adults. One consequence is that when prey abundances do not differ much, alternative stable states may arise between juvenile and adult dominance. Fishing mortality and changes in prey availability may cause switches between these states. In this case , especially juvenile mortality is found to be destabilizing and limits population persistence. For species of commercial interest, such as tuna, knowledge on mechanisms that can prevent a collapse of a profitable state or can restore a population to such a state are of great value for sustainable fisheries. We aim to parameterize a population model for important tuna’s to study the interplay between juvenile mortality and the changing pelagic habitats by FAD’s.
ANOVA thesis possibilities in Bali and Sulawesi, Indonesia (contact Paul van Zwieten, Simon Bush)
Anova Fishing and Living Internship
The Anova Food Group, a large fish importer from the Netherlands also active in Indonesia, in conjunction with WWF USA and Indonesia, is conducting a Fisheries Improvement Program on hand line caught, large, mature yellowfin tuna (Thunnus albacares) with the goal of Marine Stewardship Council certification.
The Target area is Bone, a fishing port in South Sulawesi which consists of some 400 hand line vessels, 3 landing sites and 8 collecting vessels. The tuna are collected in Bone and transported to Makassar where they are processed and either frozen for export to the USA or kept fresh and exported to Holland.
In the next two years they are looking for students who will be able to assist this team in setting up the information systems that are needed to arrive at MSC certification. Very broadly the focus will be on:
- The scientific data needed for population analysis and fisheries management to MSC requirements.
- Systems to measure interaction with ETP’s
- Log books and data collection systems.
- Data compilation systems and analysis.
- Instruction of on the ground staff of how to collect data (measurements, identification, etc.) and enter the data.
- Facilitate other related concurrent projects including salmonella cross contamination and landing site
sanitation.
Between ANOVA and us the actual work to be done Work will fluctuate between the Anova offices in Bali, processing plant in Makassar, and landing sites in Bone.
Housing, airfare, and all travel domestic expenses are covered by the project. Visa’s will be organized by Anova.
Length of the project is two years. Current Interns will hand over tasks to incoming interns. Two positions are available concurrently. To apply for the positon we need a CV and an application letter. Furthermore appointment requires a selection interview with the responsible ANOVA representative in the Netherlands.
For more information please contact Paul van Zwieten (paul.vanzwieten@wur.nl) and/or Simon Bush (simon.bush@wur.nl). Do not contact ANOVA directly!
IMARES thesis possibility:
We are looking for a MSc student that can take on a project analysis and modelling of North Sea herring growth. The project has two purposes:
i) To improve our understanding of factors controlling growth of herring in the North Sea (science objective)- basically the interaction of environmental and population effects
ii) To feed this understanding into our review of the North Sea herring stock assessment, which will take place in February 2011 (stock assessment objective).
Thus we are looking for good quality biologists with reasonable numerical skills, that can take on and complete a project within the next 10 months, or so.
The day to day supervision would be by Marc Dickey-Collas and Thomas Brunel here at IMARES.
Thesis & Internship possibilities