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The effects of Remotely Operated Vehicles (ROVs) on the behavior of marine animals have not been thoroughly studied despite the increasing use of these systems in depths beyond those that can be safely reached with SCUBA. We studied the effects of an ROV on the feeding behavior of juvenile clawed American lobsters Homarus americanus under laboratory and field conditions. The presence of the ROV in an operational state significantly reduced feedlng activities. ROV Lights and the sounds produced by electric thrusters, presented separately to the laboratory-held lobsters, reduced some feedmg activities. Simultaneous presentation of the thruster sound and the llghts was even more effective in diminishing feeding activities. Outputs of the camera and electronic flash inhibited feeding activities and occasionally initiated an escape response. In the field, feeding activities in the presence of an ROV with lights and thrusters off were not significantly different from those observed by a small stationary video camera with no lights. If an ROV is to be used for obtaining behavioral data, we suggest it be held stationary, without strobe flashes. The sound and light associated with normal operation should be minimized, perhaps by using quieter thruster motors and either infrared illumination or low-light cameras.

Impacts of Remotely Operated Vehicles (ROVs) on the behavior of marine animals: an example using American lobsters