User manual

Science Manual – Using Video Images for Fisheries Monitoring 33
Results
Approximately 60 fish were used as a subsample with which to assess the software.
Fishtick detected 75 per cent of targets and the DVMD detected 73 per cent of
targets.
5.3 Manley Hall, River Dee
Type of fish pass: Resistivity weir (Figure 15)
Power supply: Mains power available
System deployment: Validation of resistivity counter and trial deployment
Information required: Evidence of fish for comparison with resistivity data
Identification: Species level
Sizing: Possible using data collected
Cost of system hardware (not inluding image processing): below £1,000
System components
System 8 (Table 2) was used for this deployment.
Camera: One downwards-looking camera (Figure 15)
Lighting: Infrared floodlight
Recording hardware: Desktop PC with Voltek DVR card
Storage media: Two Freecom USB external hard drives (always one on site)
Image processing: Manual. No image processing software was used for the
validation of the resistivity counter. The data were also processed using Fishtick.
Results
Data were collected and used for video validation of the weir section over a number
of weeks. A subsample of five days, during which 64 fish were observed, was used
as part of the software assessment for this project. Fishtick detected 78 per cent of
the fish.
Figure 15: Manley Hall resistivity counter site showing the camera and lighting
gantry