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Science Manual – Using Video Images for Fisheries Monitoring 13

Fish sensitivity to light: References

Atema J et al. 1988. Sensory biology of aquatic animals. Springer Ltd, London.

Douglas R and Djamgoz M. 1990. The visual system of fish. Chapman & Hill,

London.

Herring PJ. 1978. Bioluminescence in action. Academic Press, Oxford.

Herring PJ et al. 1990. Light and life in the sea. Cambridge University, Cambridge.

Munz FW and Beatty DD. 1965. A critical analysis of the visual pigments of

salmon and trout. Vision Research, 5(1), 1-17.

Nicol JAC. 1989. The eyes of fishes. Clarendon Press, Oxford.

Schwanzara SA. 1967. The visual pigments of freshwater fishes. Vision Research,

7(3), 121-148.

3.3.1 Light panels – home-made and manufactured

LED light panels for underwater use were researched and developed in this project.

The light panels consist of red LED strips mounted within a polypropylene box

(Figure 3.3) and encapsulated in epoxy resin. The opaque polypropylene acts as a

light diffuser resulting in an even, stable light (Figure 3.3). LED light strips were

chosen because they operate from a 12 or 24-volt power supply and have relatively

low power requirements (Table

3Table 3.1).

Figure 3.3: LED light panels under construction and complete

Light panels were initially manufactured in-house with the aid of Operations Delivery

MEICA officers. It was, however, recognised that it would not be always be

practicable for users to build their own light panels, so discussions were instigated

with potential manufacturers. Two manufacturers were identified and their contact

details and prices are given in Table 3.4.

Making your own light panel, however, is relatively straightforward, as shown in

Appendix 9.

Light panels can be mounted either on the bed or the side of the fish pass. A

specification for including light panels in a new fish pass was developed with the

National Fish Pass Panel.

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