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ABOVE (2):
Grant Johnson with a 4-pack pressurized gun. This gun uses regulated CO2 pressure to push one of four test repellents out towards the feeding sharks, producing a cloud. This design is completely portable, and allows four tests to be conducted relatively quickly.
Spring check valves and small outlet orifices are used so that the fluid exits gently and uniformly, without creating a gas cloud and loud noises.
Dip tubes are attached to the front of each cylinder to provide an extra 4' of reach. |
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LEFT:
A fish head may also be suspended from the end of the delivery system, to bring sharks directly up to the outlet tube of the delivery system. Behavioral controls are established with the same apparatus, in order to demonstrate that sharks are not afraid to feed from the pole, nor are deterred from feeding by pressurized jets of seawater or dyed water controls.
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