Olvin van Keeken works as a fish ecology researcher at Wageningen Marine Research in IJmuiden.
I have been working in the Freshwater Ecology department at Wageningen Marine Research since 2002, after studying Animal Sciences at Wageningen University where I specialised in Fisheries. Part of my graduation project was spent looking into the development of young fish in the floodplains of the Waal River and the growth of American catfish in Oneida Lake, a large lake in the state of New York. Ten months of my programme were spent in the US studying this subject. Immediately after graduating, I started a job as a researcher at Wageningen Marine Research.
I am currently working on various projects, many of which revolve around monitoring the condition of the fish in large state-owned freshwater areas such as Lake IJssel. Some of the monitoring is carried out together with local fishermen, who record their catches for us. We also go out with fishing gear ourselves to build up a picture of for example the fish along the banks of Lake IJssel.
Other projects I work on are about fish migration. To study individual behaviour of fish we use acoustic transmitters. These transmitters make it possible to follow fish movements and to study effects of for instance pumping-station and ship locks on fish migration.