Abstract
Pandalid shrimp larvae in protected Northeast Pacific marine waters are opportunistic hitchhikers, riding piggyback on jellyfish having a bell diameter similar to the leg span of the shrimp. Ridden medusae pulsed faster and for longer periods than unridden ones. Ridden medusae rested or fed only one-third as long as they swam, whereas the resting and feeding bouts of unridden medusae normally lasted twice as long as swimming bouts. The shrimp neither damage the jellyfish nor take food from them, but many of the ridden jellyfish apparently die, perhaps because of increased energetic load.
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