RiverWatcher Program User Manual
The RiverWatcher is a counter for use in fish ladders, barrier dams or other places where fish swim through a restricted passage. Various versions are available, and the counter can be adapted to local conditions in each individual instance. The RiverWatcher consists of a Control Unit with software, a Scanner Unit with cables, solar-panel, batteries and a computer program for processing the data.
The Scanner Unit can be thought of as a gate that is placed in the fish ladder. It controls the emissions of infrared light beams from the light-emitting one side of the Scanner Unit and the signals from the receivers on the other side of the unit. When a fish swims through the Scanner Unit it interrupts the beams, the silhouette of the fish being used to count it and calculate its size. One cable runs between the Scanner plates, and there is one cable connecting the Scanner to the Control Unit. Data sent from the Scanner Unit to the Control Unit, which can then be transferred to a computer program, consist of: the height of the fish, the date and time it swam through the Scanner Unit, the temperature of the river, the results of a vision test which is carried out at regular intervals to check on the condition of the Scanner Unit’s light-emitting diodes and a silhouette image of every fish so the counting’s can be verified afterwards.
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