Figure 1:

Images of the sensory deterrent and pipe modifications used in experimental trials. Images were taken from an underwater camera downstream of the diversion pipe. (a) Control treatment, in which no modifications were made to the pipe. (b) Strobe light treatment, in which four strobe lights were placed on the outside circumference of the pipe inlet. (c) Terminal pipe plate (TPP) treatment, in which a steel plate and partial steel collar were fitted to the pipe. (d) Upturned pipe (UTP) treatment, in which sections of additional pipe were affixed to the pipe inlet to alter the orientation of the intake, and a steel plate was fitted to the pipe opening.