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Science Manual – Using Video Images for Fisheries Monitoring 9

System Comments

System 6

• Two underwater sideways cameras

opposite each other

• White board on bed of pass

• Overhead lamp (infrared or white light)

• Desktop PC with DVR card (mains

version)

• Mini-ITX PC with DVR card (12v version)

• Recommended software: Fishtick

• For very wide passes, can include an

extra downward-looking camera (add

£100 to the system cost).

• This system can be used to obtain a count

if you have full coverage of the pass exit.

• The system can be used to obtain

evidence that fish are using the pass if two

sideways cameras are used, but you do

not have full coverage.

System 7

• Up to four cameras: underwater upward-

looking cameras and/or a sideways

camera next to notch

• Overhead, angled lamp(s) either infrared

or white light

• Desktop PC with DVR card (mains

version)

• Mini-ITX PC with DVR card (12v system -

possible if only one lamp)

• Recommended software: Fishtick

• It may be possible to identify some

species from a combination of the image

and size information, but it will not be

possible to identify all fish.

• Sizing only feasible if you are able to

position markers within the camera field of

view (Section 2.1.2)

System 8

• Up to four overhead cameras

• Overhead infrared/white lamp(s)

• Desktop PC with DVR card (mains

version)

• Mini-ITX PC with DVR card – (12v

system - possible if only one lamp)

• Recommended software: DVMD (for one

camera) or Fishtick

• It may be possible to identify some

species from a combination of the image

and size information, but it will not be

possible to identify all fish.

DVR = Digital video recorder

DVMD = Digital video motion detector

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