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Vaki Aquaculture Systems Ltd. has been serving the fish farming industry with equipment for counting and estimating the weight of fish since 1986.
Through continuous product development and customer contact, Vaki has adapted its products to new areas.
Modifying the fish counter for use in fish ladders is one of our latest innovations.
The counter is based on the same technology that has been proven in exposed conditions in the aquaculture industry.
It has been in use in Iceland, Norway, England, Scotland and Ireland during the last few years with very good results
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The scanner, control unit and power supply.
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The scanner's electronic equipment is housed
in a strong plastic frame to protect it from damage.
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The basic units of the Riverwatcher are a scanner and a control unit:
The Scanner is installed in fish ladders, pools, traps or similar places where all the fish in the river have to pass.
It consists of two scanner units (20 x 60 cm) inside a frame, the distance between them being 10 to 45 cm.
Inside the scanner, light diodes send infra-red light beams to a receiver on the other side. When a fish swims through the net of light beams, the resulting silhouette image is used to count and estimate the weight of each fish.
Each individual image is memorised in the control unit so that the counting can be verified afterwards.
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The Vaki Fish Counter installed in Gljúfurá in Iceland.
Power is supplied from solar panels and a car battery.
Advantages
Comparison of catch figures and the movement pattern of the fish to calculate the
exploitation rate
Comparison of the movement pattern of the fish from one year to another
Evaluation of the results of rearing and smolt releases
Assessment of the influence of different environmental factors
Assessment of the efficiency of the fish ladder
Features of the Vaki Riverwatcher
Vaki Fish Counter counts the fish with more than 95% accuracy.
The counter measures the size of each fish with more than 90% accuracy.
The control unit stores an image of every fish that passes the scanner, so the counting
can be verified afterwards.
The date and time of day that each fish passes the scanner is recorded.The water
temperature is measured at frequent intervals.
The water tempature is measured at freaquent intervals.
The scanner's electronic equipment is housed in a strong plastic frame, to protect it
from damage.
Power is supplied from solar panels and a car battery, which makes it easy to install
the counter where there is no other power access.
The counter can easily be adjusted for use in all fish ladders, dams, traps and similar
places.
Storing and presentation of all data from a PC program.
Remote control through a mobile telephone (optional).
Triggering signal for VCR (optinal).
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