Adaptations in river basins and water management create bottlenecks for fish. Dams, hydropower plants, cooling water discharges and sluices are barriers for fish that prevent them from migrating upstream or downstream. Research into the behaviour of fish near these objects and the way they subsequently pass them is therefore very important to optimise migration routes.
Visadvies has extensive knowledge of migration behaviour and offers a wide range of monitoring techniques. Depending on the issue, the set-up is determined. To map fish behaviour in larger water systems, telemetry systems such as VEMCO or NEDAP can be used. In smaller stream systems, PIT telemetry is used. In addition, VisAdvies offers the option of following fish 3-dimensionally (3D) with acoustic transmitters (HTI tags). The behaviour of a fish at a weir, hydropower plant or cooling water discharge can thus be accurately mapped. Research is also carried out with tag-and-recapture actions. These surveys are carried out with PIT tags, Floy tags and VIE tags.
The FishCounter is used to monitor the extent of fish migration and in the evaluation of fish passages, fish locks and other technical fish migration solutions. By monitoring fish passages both ways, the efficiency can be determined.
The FishCounter is mounted in a box or underwater sill. When a fish swims by, the monitoring system detect the fish's swimming direction and give an indication of its size. When a fish swims by, a short video is also recorded, allowing the fish species to be determined. The equipment is connected to the mobile 4/5g network, allowing data to be sent directly to an online database. Malfunctions can be quickly detected and remedied ensuring data quality.