Assessing number of migrating fish, looking at passage through turbines or fish behaviour at barrier screens, ARIS & DIDSON provide a method of counting and observing fish in levels of high flow, highly turbid waters and complete darkness.
Deployed around the world looking at migratory salmonids the equipment forms the basis for salmon run estimates along rivers where species conservation for industry, recreation, ecological enhancement and protection is of the highest priority.
Deployment can take place anywhere in water, at fish passes, tidal sluices, boat mounted, pump stations, hydropower intakes, suitable structure or anywhere on open river or lake. Species and sizes monitored can range from elver movements, fry utilising habitat, fish reacting to acoustic strobes in pump chambers, counting salmon in Alaska to shark behaviour at sea. Footage and data analysis allows for both numerical population estimates and an insight into fish populations and their behaviour that helps to make accurate and educated management decisions.
ARIS 1800 can be deployed in a remote location to count migrating salmon, unaffected by turbidity and darkness the image produced allows for fish moving upstream and downstream to be counted. Post processing software includes detection of fish movement using automated features, creation of echograms to identify fish tracks and provide length measurements. Video and still image footage is easily exported for presentations, reports and stake holder interests.
Post processing transforms data into echograms meaning fish tracks can be identified, verified and measured to give information on numbers moving upstream, downstream, sizes, timing of run and when validated, species.
Signal returns can be screened to remove stationary objects in the image. Target size and strength is analysed to identify fish meaning large data sets and processing time is reduced to only looking at periods when fish are moving through.