Riverwatcher seminar

www.riverwatcher.is

Riverwatcher 101

Different counting methods available

Proven technology

Developed to minimize disturbance

Camera system Riverwatcher

www.riverwatcher.is

Twenty year anniversary

The first Riverwatcher was installed in 1992

First international installation in 1994

More than 300 worldwide...

Chinook salmon migrating

How does it work?

2 sets of diodes

This happens when a fish swims through

The scanner in action

Infrared light-curtains

A picture of the subject is projected when the beam is broken

50 beams per second

A fish passing at even speed gives a good image

Silhouette

Perfect image

Movement on a straight lineEven moderate speed

Speed

Fast

Moderate

Slow

Acc- or retardation

Extracted

Compacted

Size matters

Big fishSmall fish

Direction

UpDown

Scanner opening

BigSmall

Not only salmonids

Bream

Beaver

TenchBubbles

Pike

Chub

This is how the Riverwatcher sees 3 friends coming through at the same time

What is going on here?

Not only fish...

Silhouettes

Biggest of the year?

L/H = 4,5 113 cm och 14,4 kgL/H = 5,0 125 cm och 19,5 kgL/H = 5,5 138 cm och 26,3 kg

Fish size

Only height is measuredLength & weight are calculated

L/H=6,0

L/H=5,0

L/H=4,0

0 50 100 150

Size measurment

The infrared scanner turns on a digital camera that takes pictures/videos of each fish

Important for identification of speciesAutomatic link to other dataAdjustable lightingCan be used with a solar cell

Camera Riverwatcher

Riverwatcher with a camera system

Pictures are linked with other data

Lighting options include infra- red lighting

Camera Riverwatcher

•The camera system is also used for detecting otters and to follow their movements in the tributaries of the river Dee in Scotland

Related species

Brown Brook

Rainbow

Sex, health and markings

Female Salmon Male Salmon

Cut adipose fin

Fish behaviour

Often in pairs Don't like the fyke

Other fish

Nose Small Cyprinids

Mammals

Muskrat Oopps, I forgot to …

www.riverwatcher.is

Custom made solutions

Thanks for listeningMagnus Thor Asgeirsson