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A note on the diet and feeding of Chrysaora hysoscella in Walvis Bay Lagoon, Namibia, during September 2003

The diet of Chrysaora hysoscella was investigated from 55 specimens caught near the surface throughout 24h in Walvis Bay Lagoon, Namibia, during September 2003. The diet was diverse, ranging from dinoflagellates to carideans, and included abundant benthic species (adults and larvae). There was no clear overall relationship between medusa size and either the number or type of prey ingested, although aspects of both measures were significantly related to size when analyses were confined to the nocturnally collected data. Whereas there was a significant difference in the diet of medusae collected by day and night, principally because of an increase in the abundance of benthic prey items, it was not possible to partition this between the vertical migration of predator (downwards) or prey (upwards) owing to a lack of information on the ambient prey environment. Regardless, the abundance of benthic prey in the diet could help explain the predominance of medusae off Namibia, where there has been an increased flow of surface production to the benthos since the collapse of the pelagic fisheries.