aquaculture & fisheries

Trout Migration Monitoring in European Rivers

The brown trout is a medium-sized fish, growing to a weight of 20 kg or more and a length of about 100 cm in some localities, although in many smaller rivers, a mature weight of 1 kg (2 lb) or less is common. It is a species that thrive in a variety of ecologies and has successfully inhabited environments with different climatic conditions due to their long migration paths. For a better understanding and adequate interpretation of their migration patterns, it is necessary to understand the basics of their ecology and behavior.

TROVAN LID-650 type decoders with customized antennas are being used to read TROVAN transponders that are implanted in the trout. Reader systems are installed in fish ladders to monitor which fish are successfully passing through the ladder, as well as other locations up- and downstream to monitor movement of trout throughout the river system.

BELOW: Reader systems installed in the Sazava River, Czech Republic.