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Science Manual – Using Video Images for Fisheries Monitoring 29

5 Case studies

5.1 Haverfordwest Town Weir, River Cleddau

Type of fish pass: Larinier 1,500 mm wide (Figure 115.1)

Power supply: Mains power available

System deployment: Trial deployment which, if successful, to become long term

Information required: Evidence of fish using the pass

Identification: Species level

Sizing: Not during trial, but possible

Cost of system hardware (not including image processing): below £3,000

System components

System 1 (Table 2) was used for the trial deployment (Figure 12). The pass is wider

than the recommended 900 mm for one camera, but this was sufficient to obtain

evidence that fish were using the pass and to run a trial deployment. A second

camera will be installed following a successful trial period.

Camera: One sideways-looking camera

Lighting: an LED light panel (measuring 600 x 1,500 mm), made in-house, on the

bed of the fish pass exit channel (Figure 12).

Recording hardware: Desktop PC (reconfigured machine from EA CIS team) with

Voltek DVR card

Storage media: Two Freecom USB external hard drives (always one on site)

Image processing: The data collected were processed using both Fishtick and

DVMD. For the proposed long-term deployment, Fishtick will be installed on a PC on

site.

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