User manual

6 Science Manual – Using Video Images for Fisheries Monitoring
Example use of selection matrix in Table 2.1
Scenario:
• You have a 900 mm wide Larinier fish pass which you want to monitor.
• There is mains power at the site.
• You want to know whether fish use the pass and what species use it.
• You have a budget of £4,000.
Selection matrix:
• In the first selection criteria box, read along the row for a Larinier pass of
up to 900 mm. There are three suitable systems, Systems 1, 3 and 5, but
the rest of your requirements might narrow the options down.
• The next selection criteria box refers to the power supply. All systems can
be operated from a mains power supply, so this doesn’t reduce the options.
• From the options in ‘information required’ criteria box, choose the latter
option (evidence that fish use the pass) and read across – again, all three
systems are suitable.
• You want to identify which species use the pass, so choose the relevant
row from ‘level of ID’ option and read across. Out of the original three
options, only Systems 1 and 5 will provide this information.
• You have £4,000 to spend so buy the best! System 1 is more expensive
because the lighting is better so you will obtain better images. This is the
one you want.