Abstract
Occurrences of 18 scalloped hammerhead sharks tagged with coded ultrasonic transmitters were recorded at seamount El Bajo Espiritu Santo in the Gulf of California over a 10‐day period by automated, data‐logging monitors. These sharks remained grouped at the seamount during the day and moved separately into the surrounding pelagic environment at night. The temporal pattern of shark occurrences was related to the light‐dark cycle: individuals departed prior to dusk and returned near dawn next morning. However, arrivals and departures of more than one shark within short daytime periods indicated group movements to and from the seamount. Sharks returned repeatedly to the tagging site and not to another site centred less than 240 m from the former site.
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