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Science Manual – Using Video Images for Fisheries Monitoring 5

2.5.2 Retrofitting

In many cases, it will be possible to retrofit video counting to an existing fish pass.

For advice, please see the Contacts Section.

2.6 Validating an existing counter

Absolute validation, that is, an accurate record of how many fish actually passed the

counter and when, is very difficult to achieve. Cameras are used to obtain such a

record, but under conditions of high turbidity and flow it can be impossible to be

certain that all fish are visible and so it becomes more of a comparison. Video

monitoring techniques, including image analysis and motion detection, can be used

for such comparisons.

Existing resistivity sites have used video counting techniques for comparison and to

assist in validation. Based on actual validation data from these sites, the resistivity

count and the video count, a method of estimating resistivity counter efficiency has

been developed and is given in Appendix 2.

2.7 Equipment selection matrix

A selection matrix is provided in Table 2.1, although this is merely a guide. Use the

criteria relevant to your site and requirements on the left of the matrix to read across

and find the best system. Once you have found which system you require, refer to

Table 2.2 for a list of components for that particular system. You can then refer to

Section 3 for detailed information about the various components including supplier,

price and power supply.

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Radiant DVMD1 Bedienungsanleitung Seite 13