 At night, these schools dissolve, and the species become active, taking most of its prey during the nocturnal period.This contrasts to most jacks, which are generally diurnal hunters, although the species has been documented hunting in shallower waters during the day, especially as juveniles.The abundance of the species on the west coast of America has been linked to the occurrence of El Niño or La Niña climate events, with the abundance significantly dropping during El Niño events.