The CCTV stills show a white man in a dark T-shirt and jeans in an underground car park on the Esplanade. The images have been posted to the Caught on Camera section of the States police website.
In a statement, the force said: ‘Police would like to speak to this male in connection with the theft of a pedal cycle on the Esplanade between 31 August and 2 September.’
A spokeswoman said several bikes were reported missing in the area within a similar time frame.