A data-compressed audio waveform is temporally modified without requiring complete decompression of the audio signal. The device preferably comprises a pole or rod having electrical prongs at one end which my be applied to the marine animal, thereby applying and electrical signal having a voltage, amperage and frequency that stuns andor shocks the animal. The micro control unit has a second memory module for storing a first scheduled time of the plurality of scheduled times provided by the first memory module and a timer for providing a real time. The assembly can be augmented after initial installation with minimal intrusion and destruction of the wall. A longitudinally extending elastic gathering member is attached to each side flap adjacent to its proximal edge.