Olvin van Keeken works as a researcher fish ecology at IMARES in IJmuiden.
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 gears ourselves to build up a picture of for example the fish along the banks of Lake IJssel. Another recent project involves analysing the presence and behaviour of fish using an acoustic camera. This piece of equipment allows us to record fish activity in murky water or even at night around man made structures like pumping stations or mills. It is a great new technique that enables us to observe fish behaviour and make interesting films.
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