Salmon and trout parr

An underwater CCTV camera captures the secret life of fish..

A submersible camera was placed in the Bovey Valley, Dartmoor for 4 days and filmed these salmon and trout parr. The river was exceptionally clear.
The submersible camera was used with a GenieCCTV SD DVR recorder, which was housed in a waterproof plastic case together with a lithium polymer battery (Tracer power). This case in turn was contained in an outer box chained and padlocked to a tree for security. This method means that connections from the camera to the recorder and battery need not be totally waterproof, which saves a lot of trouble. In addition the inner plastic case can be keft slightly open in summer to allow for ventilation of the recorder.